Posts by tag: Two Stroke

Yamaha April 6, 2019 posted by

Sorted: 1986 Yamaha RZ500 for Sale

Compared to a modern superbike, the fire-breathing performance of vintage two-stroke race replicas maybe isn't quite as wild as their reputation would suggest. At the time, they were light and very powerful, but weren't exactly at Grand Prix extremes of either even then. Modern machines have levels of rigidity, suspension response, and electronic assistance an old smoker like this Yamaha RZ500 could only dream of, back in the hazy 1980s. But an RZ500 still has the goods to be hustled along a canyon road, and this example has had a couple of updates to the running gear to help it hang with newer bikes.

Also known as the RD500LC in Europe and the RZV500R in Japan, the RZ500 was powered by a a liquid-cooled 50° two-stroke V4 that featured twin cranks, a pair of YPVS power valves, a balance shaft to smooth things out, and magnesium components to reduce weight. Lubrication for the two-stroke was handled by Yamaha’s Autolube oil-injection and the transmission had six speeds. At the front was a 16" wheel and a set of anti-dive forks matched to an underslung rear shock and an 18" hoop out back, limiting a modern rider's access to good performance rubber.

The Yamaha RZ500 made a claimed 88hp and weighed in at 436lbs wet, while a 1986 Suzuki GSX-R750 of the same period made a claimed 106hp and weighed 465lbs wet, so performance was pretty similar on paper. However, the character of the two bikes couldn't be more different. With heavy two-stroke smoke dripping out of the four exhaust tips and the crackle and zing of the engine, you have to work the RZ500 much harder, in spite of a pair of power valves designed to improve midrange response.

Interestingly, the Japanese market bikes received an aluminum frame to offset the reduction in power required by government restrictions. I always wonder why, since this was a premium sportbike to begin with, they didn't just fit the aluminum frames to all of them. Certainly, if you wanted to build your dream RZ500 and throw originality to the wind, that's what you'd probably do. This particular bike follows the path of "thoughtful evolution" and includes some components from later machines that should help the bike's cornering prowess.

It's maybe not a purist's museum piece, with the later YZF750 front end and 17" wheels. But, while the RZ500 was commendably light and agile by mid-80s standards, an update to the fork and brakes should help bring the bike closer to modern feel, while the ZX6 wheels will make tire choice much simpler, and give the new owner access to modern levels of grip.

From the original eBay listing: 1986 Yamaha RZ500 for Sale

We are a Yamaha dealer selling this bike for a 2 stroke collector's estate. This is a great example of a 1986 Yamaha RZ500. It has a clear Pennsylvania title (has been here since at least 2006) but was originally sold in Canada. VIN is JYA52X007GA007150. The odometer reads 73 miles but since the KM speedo was replaced the actual odometer is aprox. 7500 km with about 1000 km since rebuild.

Cosmetic condition as you can see in the pics is excellent. Bodywork is all OEM including solo cowl. We've included a owner's manual and service manual - all in good shape. There is 1 original factory key and 1 copy. Frame up restoration done in 2006. At that time, all seals were replaced, cylinders honed (std bore)

We've had our resident two-stroke tech go through the bike after a short storage. Air cleaner was replaced, tank drained, carbs removed and thoroughly cleaned, etc. Plugs replaced, fresh trans oil. Bike started easily and runs well with no clutch slippage. Left fork seal has slight seep and as any two stroke, it could take more fussing to get carburation perfect. Trans shifts very well but clutch pull a bit heavy (upgraded springs?). Brakes solid and chatter free. This is a well sorted RZ.

Upgrades and mods include but are not limited to:

  • YZF750 complete USD front end and brakes.
  • JMC custom polished swingarm
  • Penske remote reservoir rear shock
  • Alex Mayes chambers - Rare!
  • Carbon Tech low tension reeds (porting is stock)
  • ZX6 wheels (both wheels powder coated red)
  • Magnesium left engine cover
  • Braided brake lines
  • Hindsight mirrors
  • MPH speedometer
  • Zero Gravity windscreen
  • Carbon fiber meter panel

There is NO reserve or buy-it-now price on this item

Other RZ brochures and some parts are available but are not included with this bike.

Pick up at our dealership in Pennsylvania (19512) has no charge of course, but delivery by truck or international shipping is the responsibility of the buyer. 

As the seller describes it, "this is a well sorted RZ," a daily rider that captures the feel of an earlier era of performance, with a couple modern touches. Unfortunately, there are no takers yet at the $13,000 starting bid, with just a few hours left on the auction. Is it too early in the season? Were the modifications just a bridge too far? Has the interest in two-strokes plateaued?

-tad

Sorted: 1986 Yamaha RZ500 for Sale
Yamaha April 5, 2019 posted by

Punching above its weight: 1976 Yamaha RD400

The 1976 Yamaha RD400 came out screaming in 1976, a mag-wheeled exclamation point on Yamaha's range of popular, fast-paced two strokes. To make sure the message landed, Yamaha re-tooled its factory to build the RD400's parallel twin, which was more than just a rebored version of the RD350's mill. A longer stroke necessitated new crankcases, which meant the factory needed new tooling. That was a gutsy move, as even then street two strokes had fully entered their sunset years.

1976 Yamaha RD400 for sale on eBay

The little beast knocked out 45-ish horsepower, and had a slightly flexy steel frame and a delicious tendency to pull the front wheel on acceleration. By most accounts, the single-disc front and rear brakes were terrifying, which made the 106 mph top end seem that much more astronomical.

This 1976 Yamaha RD400 has had a fairly recent restoration, which featured a rebuilt engine, new paint, new tires and tubes, new touch points and rebuilt carburetors. It's ready to look and play the part this riding season. The reserve has not been met, but the seller says he is open to offers.

From the eBay listing:

This is a very clean matching #'s RD 400. Rebuilt engine , new tires & tubes. Fresh paint & decals.
Rebuilt carbs. New grips. Nice clear gauges. Good controls. Original mirrors. Aftermarket OEM style signals. Good chrome with slight patina. All stock with the exception of the seat & paint. Very clean rider for the summer.
Open to offers.

A $750.00 Non- Refundable Pay Pal deposit is due within 48 hours. Full payment via bank check or wire transfer due within 7 days and before you come to pick it up. Funds must clear before pick up. NO PAY PAL FOR THE BALANCE!!!! Pick up due with in 30 days. I have the necessary paperwork to transfer ownership. You must have 10 or more recent feedback. Bidders with less then 10 feed back will have to contact me before bidding or be canceled. If you are the winning bidder. Please plan on completing the transaction. Sold as is.

On first blush, the RD400 looks like just another soldier in the legion of UJMs that were spat out in the 1970s, but it carries some extra panache and a bunch of extra punch. Two strokes of its ilk are a slice of life from a time before strict emissions regulations, and a window into motorcycling's truly wild years.

Punching above its weight: 1976 Yamaha RD400
Yamaha March 31, 2019 posted by

Fall Clearance Sale – 1992 Yamaha TZR250R-SP

Pictured in a lush garden, this barely used TZR250R-SP is actually old enough to import without EPA scrutiny.  Up for sale at the end of summer in Cape Town means a close-up inspection might be a project, but this example is at least a great what if ? - conversation starter.

1992 Yamaha TZR250-SP for sale on eBay

TZR250 production started in 1986 with a parallel twin engine, and was upgraded to a V-twin when the model was re-designed for 1991.  Some sources says the -SP used a larger carburetor, and all models used Yamaha's Power Valve System to stretch the torque band.  45 hp was mandated in Japan, but once released from its electronic bonds, the engine is capable of a reliable 60 hp.  It's got a small copy of the DeltaBox alloy chassis, and an early adoption of upside-down forks.  A few different swingarms were used, this one the asymmetrical, allowing the rear exhaust to pass under the bike.

Good export histories from these years are hard to come by, but most TZR's were for the JDM, with occasional exports around the Pacific.  Sport Production seems to be limited to 500 units.  No word on the history of this particular machine, but the mileage is seriously low and condition appears excellent.  Aftermarket exhaust and budget shipping are noted in the eBay auction:

Rare superb condition 1992 TZR250R-SP  (3XV-5).

One of only 500 produced.
Original factory body panels and paint. 
Low mileage 2554Km (1576 miles).
The buyer has a choice between the original exhaust silencers or the aftermarket Dog Fight R silencers which are depicted in the photos.
 
Worldwide shipping is available!
Shipping cost to any port of entry in:
North America : $950

Yamaha's 1/4-liter machines are rarely seen, though the sunset of their emissions requirement has brought more recent imports of the later 3XV's.  Never cheap, their quality and tech gave Big Red a run for their money.  The buyer will have to determine whether this example has been de-restricted, and if there are any long past secrets.  If yes and then no, this TZR will still be expensive but might be worth it.

-donn

Fall Clearance Sale – 1992 Yamaha TZR250R-SP
Aprilia March 29, 2019 posted by

Featured Listing: 2004 Aprilia RS250 Cup

Update 4.8.2019: Sold for full asking price! Congratulations to buyer and seller! -dc

We showcase a lot of two strokes, and we wax poetic about their knife-edge handling and peaky, unforgiving powerbands. Most of the time, we're showing off nice but rider-quality machines that will make the new owners very happy on the track or in the canyons. Not today. Today we have a time capsule 2004 Aprilia RS250 that the seller couldn't bring himself to tear up on the track. It's so nice that he went to the length of sourcing another RS250 rather than ride this one in anger.

Instead, it sat, unmolested and unblemished in his basement on display. As such, it is as close as you're going to get to perfect, and is original down to the scrub in on its first set of tires. It comes with all the factory documents and stickers and shows less than 400 miles on the odometer. Having been sold in or around New Hampshire originally, there's little chance it's ever going to see an American road. That's all well and good, as it's almost too cherry to tear up now.

The RS250s were powered by a version of the Suzuki RGV250 v-twin that Aprilia tweaked heavily for their purposes. With a lighter and more focused chassis and suspension than the RGV, the Italian became the mount of choice for up-and-coming racers including Loris Capirossi, Max Biaggi, Jorge Lorenzo, Marco Melandri and Alvaro Bautista, all of whom went on to MotoGP fame. For a hammer-simple 70 horsepower two-stroke, that ain't a bad CV.

From the seller:

If you are looking for a perfect, as new RS 250 for your collection, look no further this is your bike. Here’s the back story, I was looking for an RS 250 as a track bike ten years ago. I found this one and was amazed how nice it was. I purchased it then once it was home, concluded it was too nice to track as it needed to be preserved. So I bought another RS 250 for this purpose which I still have. As such this one has been in my climate controlled finished basement on a lighted display table ever since to be looked at and admired. This one is a time capsule that has less than 400 miles original miles on it, 100% stock including tires, no modifications and all of the idiot stickers that came on it. I’m a collector so selling this to fund a new addition to the herd. I know that peoples definition of condition varies greatly much to my chagrin in looking at other bikes, because of this I tend to understate the condition of things. I would rate this close to a 10 out of ten, no blemishes, never dropped, like new, perfect paint, just a pleasure to look at. As it was in my basement the paint is in great condition with no oxidation or sun damage. I just pulled it out to get it ready for sale, added a new battery and it’s on its way this week to Seacoast Aprilia – Ducati, which was the original dealer that sold it to change out the fluids and go through it to make sure there are no issues. It will be in perfect running condition for the lucky buyer with the original MSO. If you are serious I am sure I can arrange for you to speak with someone as Seacoast to get an unbiased second opinion. Like all two strokes RS 250’s are getting harder to come by, finding one in this condition is very rare as most have been flogged on the track and modified. Thanks for looking, $10,500 located in New Hampshire.

As either a display bike or a track day toy, you can't say fairer than this little RS250.

Featured Listing: 2004 Aprilia RS250 Cup
Yamaha March 26, 2019 posted by

RZ Redux – 1984 Yamaha RZ350

A major rejuvenation of a small-bore can only start as labor of love.  This Missouri refurb concentrated on the mechanical, but the cosmetic looks great as well.

1984 Yamaha RZ350 for sale on eBay

Magazine editors said the visible frame on the RZ looked like a racebike, surrounding the water cooled vertical twin.  Since it was a road machine, Yamaha augmented the two stroke with their Power Valve System and catalytic converters.  59 hp was phenomenal for a 350.  Triple disks were great, though the lightweight suspension was adjustable for preload only.  Accented by the cool chin scoop, body work flowed from the bikini fairing to the tank, side covers and seat console.

Sitting for a generation but having covered only 8.050 miles, this RZ was given the works:

Just refurbished:

Both master cylinders and new o-rings in all calipers.

New oil lines, and fresh two-stroke oil

Fresh fork oil

Fresh gear oil

Fresh anti-freeze

New air filter

New battery

New needles and seats in the carbs

The CDI was just sent to RZ’s Unlimited to repair the infamous cold solders

Just installed the 1985 mounting kit for the lower cowl

New grommets for the side covers

It has the above mentioned new manual petcock from RZ’s Unlimited, but I will send the stock vacuum petcock with the motorcycle.

Also has a 16-tooth countershaft sprocket on right now, but I have the stock 17-tooth sprocket.

I have the tool kit, owners manual, and two keys (one original and one duplicate).

An old faux pas on the tank was addressed, but too fancily for the owner:

Both areas were repaired and they did a nice job. EXCEPT! I told them I did not want the warning stickers on the top of the tank removed. So when he repaired the damage, he cleared over the red on the tank and fairing, and you notice where he taped it off if you are close enough. The color is perfect, but it is a little brighter, because of the clear.

Light and easy to ride made the RZ350 popular, though moving over to the track brought the challenge of keeping the little kettle on the boil.  Overdue for a set of expansion chambers, the new owner might want to hang on the factory exhaust in case a move to California is ever an idea.  Bidding is brisk about halfway through the auction but hasn't met the reserve, hopefully this nice riding rehab will pay off for the owner.

-donn

 

Aprilia March 20, 2019 posted by

Shipping Not Included: 1998 Aprilia RS250 for Sale

The Aprilia RS250 was my introduction to the quarter-liter two-stroke sportbike class. I didn't even get into motorcycles until the late 1990s, by which time two strokes were completely gone from the sportbike scene here in the US. But, as an avid reader of the British biking magazines, I saw them mentioned time and again in such glowing terms. Sure, there were performance differences between the Honda NSR250, Yamaha TZR250, Kawasaki KR-1, and Suzuki RGV250 that loaned its engine to the Aprilia, but as a group they pretty much set the standard for light weight and handling. Bikes today still aspire to be so simple, purposeful, lightweight, and engaging.

As I mentioned, Aprilia didn't design the RS250's engine, they borrowed a perfectly good one from Suzuki. Aprilia claimed a host of changes the RGV250's engine, but mostly they didn't mess things up, since the two-stroke v-twin was already a solid choice: tuning parts were readily available and it was capable of making competitive power. Instead, Aprilia focused on the bike's frame and swingarm, in the process creating a hybrid machine with sublime handling, Italianate looks, and good parts availability for maintenance and tuning.

I prefer the looks of the first-generation RS250, but the updated styling seen here is still a winner and the partially-digital dash, while looking decidedly retro today, was pretty cutting-edge at the time, with an analog tach and digital speedometer, as well as a lap-timer function.

This one also includes passenger pegs and that hideous pillion pad that grows like a tumor from the top of the sloped tail section. The only bike with an uglier solution might be the biposto Moto Guzzi Daytona 1000. These little two-strokes make generally terrible two-up mounts, but at least the earlier version of the bike looks like they put a bit of thought into making the bike capable of carrying two in a pinch, without murdering the sleek lines...

From the original eBay listing: 1998 Aprilia RS250 for Sale

MADE IN ITALY !!! Collector's Bike-Antique. This model has won a lot of world championships! Aprilia Racing spirit super fast supersport bike antique. The Ferrari of motorbikes! Aprilia sells replacement parts for this bike till now. 250cc racing two-stroke with 0-60miles or 0-100km at 4.3 seconds, the bike it is, like it was bought, no modification was made because it is already powerfull. These engines produce 300 atmospheric horse power (without turbo or supercharger) at 1000cc when they have racing carburetors and exhausts. The bike has the manufacturer's upside-down racing forks and the manufacturer's GOLD Brembo brakes!!! It only needs new battery.

WARNING: SHIPPING NOTICE :    I CAN HELP AT THE SHIPPING PROCESS. I CAN PACKAGE THE BIKE IN THE SAME BOX AS THE MANUFACTURE SHIPS IT. ALSO I CAN FIND FOR YOU A SHIPPING COMPANY IF YOU DO NOT HAVE THE TIME FOR IT AND GET READY ALL THE LEGAL PAPERWORK. THE BIKE IS SOLD WITH THE LICENSE PLATES READY FOR ROAD USE IF YOU LIKE OR WITHOUT THEM IF YOU WISH TO RIDE IT IN THE TRACK-COURSE. THE SELLING PRICE OF THE BIKE IS THE SAME FOR BOTH CASES. SHIPPING COST IS THE BUYERS EXPENSE. IF THE BUYER WANTS TO COME TO ATHENS FOR THE PACKAGING AND SHIPPING THIS CAN BE DONE (i will escort him/her from the time that will arrive to the airport) IF THE BUYER WANTS TO RIDE THE BIKE TO THE DESTINATION COUNTRY, IF THE COUNTRY IS NEAR BY, THIS CAN BE DONE ALSO, ALTHOUGH IT IS NOT RECOMMENDED.

The bike has 13,600 miles  or 22000 kilometers. The indication of distance made from the bike on the display is in kilometers.

Used by riders such as Valentino Rossi, Max Biaggi, Marco Melandri, Jorge Lorenzoand, Loris Capirossi in MotoGP races.

The Aprilia RS250 is powered by a modified Suzuki RGV250 (VJ22) engine which is prepared by Aprilia, changes include a revised ECU, Aprilia-designed expansion chambers, barrels and airbox. The twin 34 mm flat slide Mikuni carburettors inside.

The frame is a cast twin spar aluminium/magnesium alloy with thin-walled monocoque reinforcements, with the engine as a fully stressed member manufactured by Benelli for Aprilia. The banana swingarm is made out of the same polished aluminium alloy as the rest of the frame. The reason for the swingarm's banana shape is to allow the expansion chambers to run unobstructed under the engine to improve ground clearance in turns.

The forks are 41 mm Showa inverted units and are adjustable compression and rebound, the rear suspension is a Sachs mono-shock which is adjustable for preload,compression and rebound. The front brakes of the RS 250 are Brembo dual 298 mm discs with Brembo Oro four-piston calipers. The rear brake is a single 220 mm disc with a Brembo twin-piston caliper.

The front & rear rims are lightweight, 5 spokes, cast aluminum rims are 3.50x17 up front (3.0x17 on the older models) and 4.50x17 out back that require tires of 120/60x17 and 150/60x17, respectively.

The RS gauges feature a digital instrument panel that gives the rider a variety of information. It will display maximum and average speed readings in kilometers or miles per hour, an adjustable rev limiter warning zone indicator,water temperature in choice of scale, battery charge indicator, a clock,and a chronometer that can remember up to 40 lap times.

Note that this bike is currently in Greece, so I'm sorry for the let down if you're... Somewhere other than Greece. When we first spotted the listing, the price was a jaw-dropping $50,000 which raised a bunch of questions... Fortunately, the seller realized that might be a bit out-of-line, considering current RS250 values, and the listing currently shows a Buy It Now price of $12,000 which is much more reasonable. Mileage isn't exactly collector-bike low, but it looks well maintained, aside from the broken left-front turn signal. It otherwise appears to be in good condition, a nice example of an appreciating two-stroke sportbike.

-tad

Shipping Not Included: 1998 Aprilia RS250 for Sale