Posts by tag: Two Stroke

Kawasaki October 18, 2018 posted by

The Namesake – 1972 Kawasaki H2 750 Mach IV

Like Chevy's Z28 Camaro, the H2 is a model that creeps back into Kawasaki's line-up occasionally, but here we have the pre-historic beast that made the name.  The fire-breathing two stroke triple lasted only a few years before being regulated out of existence, but memorable enough that H2 is only applied to the most extreme green offerings.  The Florida example has somehow escaped the overcooked wheelies and tank slappers that claimed so many of its siblings.

1972 Kawasaki H2 750 Mach IV for sale on eBay

 

Coming hot on the heels of the 500cc H1, the Mach IV used the same successful formula - acceleration above all.  The 74 hp available were jammed into the upper reaches of the powerband, and weight was kept to a minimum at just 450 lbs. topped off.  Period single front disk and rear drum were adequate, as was the double cradle chassis, unless they were hopelessly out-gunned by the right wrist.  With a 19-inch front and 18-inch rear wheel, straight line stability was favored in the handling compromise.

 

This H2 is returning to the road at a ripe old age, and looks very good for its 30K miles.  Though not mentioned, the paint might be a little too nice and spell an older restoration.  The owner has gone over it carefully maintenance-wise, and provides this list in the eBay auction:

installed air filter box with a new (genuine) 3 way rubber manifold,
and a new (unknown manufacturer) upper snorkel.
needs internal filter element as I have none left.
drained and put new brake fluid in front cylinder, shoes and pads look good and all cleaned.
reset timing, cleaned and re-gapped pickups.
pistons are very recently installed (you can still see the cylinder honing marks) virtually no carbon build up.
cylinders are still at factory standard bore of 71mm - great compression.
complete new carb internals and set to factory standard.
crank seals and gearbox were inspected, all sweet.
3 x new NGK B9HS Japanese plugs.
new battery.
gas tank cleaned and new complete fuel tap seal kit installed.
no center stand installed but I can (if interested) supply one with bike that needs minor work,
a clean and a return spring.
clutch stripped/inspected and rebuilt, working great with no slippage.
as new bridgestone spitfire tires fitted and rims balanced.
all new fuel/vacuum lines installed.
the seat cover is perfect, the pan has no rust but the original foam will soon start making the dust particles.
exhaust is totally solid with very minor scuffs/dents but the chrome is starting to get tiny blistering on the lower middle pipe and would need to be re chromed to be show quality but is great as a daily driver.
new cylinder exhaust gaskets were fitted, center seals were checked and good,
all baffles are present and the only place you see two stroke fumes are coming out of the back end 🙂
I left the engine casings with the original patina on them as I know some people think polishing reduces value, so I have left that choice to the new owner.

 

Kawasaki had their eyes on the new Formula 750 race series and went racing in 1973 with the likes of Yvon DuHamel and Gary Nixon, but had more success rubbing Honda's nose in it on the road.  The quickness and low price of the H2 glossed over a lot of irrational rider exuberance, and though subsequent model years smoothed out the power delivery and handling a bit, the early models are legend.    The 900cc Z1 was introduced in 1972 and though the two models existed side by side for a couple of years, time marched on and showed the H2 the exit...

-donn

The Namesake – 1972 Kawasaki H2 750 Mach IV
Derbi October 12, 2018 posted by

Featured Listing: 2005 Derbi GPR50 for Sale

Considered a moped for legal purposes, today's Featured Listing Derbi GPR50 looks like a real motorcycle for the most part: liquid-cooling, electric start, full fairing, 17” wheels, under tail exhaust, six-speed gearbox, aluminum frame… But then there’s the lawnmower-sized 50cc displacement. From the factory, you were looking at 8.8hp at the crank, or around 5.5hp at the wheel. Normally, I scoff at partial horses, but every single pony counts when you’ve got just 49.9cc to work with. The same thing goes for the .9cc displacement, obviously.

The hydraulic brakes work well, especially considering the GPR50's light weight, but you certainly won’t need them to slow down too often: the bike takes care of that for you by not being fast to begin with. Obviously, top speed isn't the point with a bike like this, and the parts are there to maximize the limited power: that six-speed box means you can stay in the meat [tofu?] of the powerband and, while the suspension is pretty basic, a 242lb weight and great geometry mean a GPR50 could be pretty fun on a tight road or go-kart track.

This example has been modified with a 77cc "big bore" kit that should take the bike to around 9 horses at the rear wheel, but the bigger jump should be in torque: the stock bike makes around 4 ft-lbs and a kitted bike like this should be closer to 7... Performance data for the GPR50 is pretty scarce, but a Cycle World review of the mechanically similar 2000 year model with the same kind of displacement upgrade claimed 60-65mph on level ground, with 75mph possible, flat-out in sixth gear, using a bit of drafting…

From the Seller: 2005 Derbi GPR50 for Sale

For sale is a US spec (MPH speedometer) 2005 Derbi GPR50. At one point this bike was imported to Quebec Canada, and the present owner has had the bike for the last 6 years. Due to the fact that this is registered as a 50cc, and it was plated as a  Scooter. We still have the Quebec registration that states its a "CY" (cyclomoteur = scooter). PLease check with your own state laws, as it differs from state to state. 

The Derbi GPR50 is a single piston two stroke 6 speed water cooled bike. Inverted forks, and monoshock rear suspension. Electric starter and weighs in at about 220lbs. The Derbi GPR50 up for sale in Montreal Canada, and has about 12,000 miles (To be confirmed; battery will be changed to access mileage) bike was totally rebuilt in 2014. 77cc Airsal cyl. Top racing crankshaft, 21mm carb. Arrow exhaust/expansion chamber, clutch and reeds from Malossi, new chain, new sprockets, and tires. bike was used for about 1800 miles since rebuild, and has always been sitting inside our climate controlled garage. It has not been used on the road since about 2 years. Bike has a few scratch from a small miss hap in 2014, and a few blemishes from being a 13 year old bike. Besides that , in extremely good condition , and will reach about 70MPH in 6th.

Needs a battery (we will put a fresh one in), and the clutch could be refreshed. Bike has an electric starter. Asking $2,900USD firm, will crate, and assist in shipping, but shipping to be arranged, and paid by the buyer. We have the clean, and free of lien registration, (which is the same as your Title).
Originally a US import, so gauge in MPH. Paypal for initial deposit, but bank transfer is the only way we will ship the bike, unless you pick up with cash. This is a private sale, feel free to contact the seller, at his place of business for more information.

Obviously, a GPR50 is more a toy than an actual transportation device, even with the increased 77cc displacement, at least in most of the United States. But for $2,900 this could make a great urban runabout, or a massively overqualified but very stylish pit bike. Or maybe you've got a youngster looking to start a racing career?

Contact info@tech-53.com with your interest.

-tad

Featured Listing: 2005 Derbi GPR50 for Sale
Honda October 8, 2018 posted by

Very Polished: 1988 Honda NSR250R SP Rothmans Replica for Sale

You are not looking at a Honda NSR250R Rothmans Replica. Sure, it's shaped like an NSR250R, but if you look a bit closer you'll notice something a bit... off. Someone's gone a bit crazy with the metal polishing wheel and, in the process, created something that will surely inflame the comments section. Please try to be polite...

The stock NSR250R frame is welded up from cast and extruded sections, and the main spars are a bit shiny, compared to the cast bits, but they generally don't have this bike's mirror-like sheen. And the swingarm and fork lowers don't generally look like they came from the JC Whitney parts catalog. In the 80s and 90s, polished frames were a bit of a thing, and plenty of Japanese sportbike owners added a personalized touch to their rides by adding a bit of bling. Bikers like shiny things... Unfortunately, collectors are a different breed, and tend to like their bikes very stock.

All NSR250s were powered by Honda's liquid-cooled two-stroke v-twin, and the lightweight Magtek wheels suggest this is a genuine SP, although I can't see a dry clutch in the pics. Certainly a real SP or "Sport Production" Rothmans Replica would be at the high-end in terms of desirability for the NSR250, but all that polishing is going to be tough for many two-stroke fans to swallow.

From the original eBay listing: 1988 Honda NSR250R Rothmans Replica for Sale

This Is a 2-stroke race replica v-twin made for the Japanese market and sold in Japan. It runs perfectly, doesn't leak any fluids, and functions as it should. Starts on 1 or 2 kicks hot or cold. Oil injection works. Leakdown is excellent. All lights and gauges work. Speedo is in km and reads 36072. There is no horn. All fluids have been changed. All wear items,(brake pads, chain, sprockets, tires) are in excellent condition.

 It has been heavily optioned/modified with the following: 

  • JHA pipes
  • Real Balance rearsets 
  • Steel braided brake lines
  • NHK steering damper
  • HRC De-restrictor box 
  • Complete wiring, coils, PGM II ECU out of MC21 model
  • Curved larger radiator from MC21 model
  • Shorai lightweight battery
  • Carbon fiber clip-ons
  • Billet upper triple clamp
  • Front forks rebuilt with cartridge emulators

Buyer pays shipping, will help with crating and delivery to a local shipper for a reasonable fee.

The seller has a starting bid set to the tune of $9,000 and... I have a bad feeling he's not going to get many takers: too many unanswered questions. While many purists may balk at all the bolt-on farkles, they don't bother me. They're not my taste either, but easy to change: you can either spend a bit of time tracking down factory, or at least period-correct bits. Or just some anodized black bits. But however solid the bike is mechanically, it's going to take a particular buyer to overlook that frame, since you're going to have to do some pretty serious work to get it looking stock.

-tad

Very Polished: 1988 Honda NSR250R SP Rothmans Replica for Sale
Yamaha October 4, 2018 posted by

Historic Stroker: 1977 Yamaha TZ750 for Sale

Update 10.04.2018: Back on eBay for $60k or make offer. Too cool not repost 🙂 Links updated. -dc

Update 10.23.2017: We first saw this TZ750 for sale in March 2016 with a buy-it-now of $95k. It is now listed for $62k. Good luck to buyers and seller! Links updated. -dc

1977 Yamaha TZ750 R Side

It’s pretty much raining Yamaha TZ750s this week, with no less than three of these valuable and iconic racers available for sale, of the 600 or so that were built throughout production. It’s a bit older than the bikes we normally feature here on the site, but I think we can make an exception in this case. If you’re not familiar, the TZ750 was Yamaha’s two-stroke roadracing machine that was dominant in AMA racing during the 1970s.

1977 Yamaha TZ750 L Side Tank

Early bikes put out around 90hp but that jumped to 140 by the time 1977 had rolled around. That may not sound like much by today’s standards, but combined with the bike’s light 345lb weight and the primitive frame, suspension, and tire technology of the time, it was a true test of a rider’s skill to keep the beast pointed in a straight line, to say nothing of the curves…

1977 Yamaha TZ750 R Side Lower Fairing

The first bikes actually displaced 700cc and were reportedly built up from a pair of Yamaha’s racing 350s, a rumor borne out by the fact that some of the early TZ700s appear to have “347” stamped into the cases. But the later machines that debuted in 1975 shared no parts at all with the parallel twins. Apparently based around a bored-out 500cc Grand Prix engine, the TZ750 eventually moved from a twin-shock to a monoshock rear suspension for vastly improved handling. In any case, they were the bikes to beat throughout the 1970s, with both power and reliability. They just needed brave and skilled riders able to exploit them.

1977 Yamaha TZ750 R Side Engine

From the original eBay listing: 1977 Yamaha TZ750 for Sale

This is the 1977 Vesco/Romero/Busch Beer TZ750. Lots of history.

The engine cases in the bike now are an early spare. The original cases have just had a repair to the shift fork rod support boss and are ready to go back in the bike.

The original engine was also used as the rear engine in the Vesco land speed record streamliner.

Bike is sold as is and with Bill of Sale.

Some spares will also be included in the sale.

1977 Yamaha TZ750 L Side Engine

With a Buy It Now price of $95,000 I’d hope that “all the spares” would be included in the sale. Or that the seller would include a few more details regarding exactly what spares: when you’re trying to keep a forty year old racing machine running, every bit helps. That’s obviously a lot to pay for any motorcycle, but I’ve no doubt this thing is worth some serious cash, given its rarity and racing history.

-tad

1977 Yamaha TZ750 R Side Rear

Historic Stroker: 1977 Yamaha TZ750 for Sale
Honda October 3, 2018 posted by

Jersey Strong: 1991 Honda NSR250R SP for Sale

The New Jersey Turnpike, in spite of being the punchline for a million jokes, is actually a marvel of modern efficiency, an engineering feat that allowed commercial traffic to flow more easily through state to points north and south. But there are just too damn many cars in Jersey for the traffic to flow these days, and the engineered straight-line qualities that make The Turnpike a great commercial road make it a horrible road for motorcyclists, unless pinning the throttle to the stop is your thing. And today's Honda NSR250SP is pretty much the worst bike for that kind of riding.

With just 249cc worth of two-stroke power on tap, sustained high-speed runs, or high-speed runs in general are pretty much out of the question. Sure, it'll do 130mph flat out, but it's tiny and, at just 288lbs dry, it's pretty obvious the NSR250R wasn't designed for that kind of riding. Fortunately, you don't have to go very far in New Jersey to find the kinds of roads the little two-stroke is perfect for: it's not called "The Garden State" for nothing, and it can be a beautiful place, once you get clear of the seemingly ever-present congestion. And deer: they're everywhere. Luckily, this lightweight machine has triple disc brakes to pull the little NSR up quickly, should one of those things leap or just wander out into your path.

Power came from a slightly undersquare liquid-cooled two-stroke 90° v-twin with bore and stroke of 54 x 54.5mm. Two strokes are mechanically simple, obviously pretty dirty, and the bike still uses carburetors, but the NSR is in every other way a very sophisticated machine. Honda's PGM-III system controlled ignition advance and the RC valves based on information supplied by throttle and gear-position sensors. The six-speed gearbox was a cassette-type to ease gearset changes trackside, although that's more of a theoretical benefit than a practical one for most owners. The SP or "Sport Production" version seen here added a dry clutch and lightweight Magtek wheels, along with adjustable suspension at both ends. In between the standard R and the SP was the mid-level SE model that lacked the SP's magnesium wheels for a reduced cost.

From the original eBay listing: 1991 Honda NSR250R SP for Sale

1991 Honda NSR 250 SP

9913 Miles clean New Jersey title 

Fresh fluids (coolant, gearbox, 2T and brake fluids)

Rust free tank

All original plastics

Bike does have some light scratches on the side fairings, broken tab on the belly pan and broken piece on the front upper fairing. Please take a close look on the pics for better description of the condition. Everything else is in really nice shape including the frame, subframe, fork, tank, wheels and tail piece. Please feel free to message me for any inquiries. Thanks for looking

The Buy It Now for this NSR250SP is $9,800 which seems reasonable, considering some of the more outrageous asking prices we've seen for NSR250Rs, especially the higher-spec Sport Production model. The bike isn't described as being perfect, but seems like a clean runner, and that Jersey title is a nice extra: when it comes to grey market bikes, The Garden State isn't the easiest DMV to navigate.

-tad

Jersey Strong: 1991 Honda NSR250R SP for Sale
Yamaha September 29, 2018 posted by

Swimsuit Issue – 1977 Yamaha RD400

Mid-seventies the two-stroke era was winding down, most manufacturers were looking for ways to tie their new mid-size four strokes to their smoking forebears.  Yamaha stretched it out, keeping the RD-400 in the line-up until 1980.  For 1977 they offered cast wheels, all disk brakes and 14-second 1/4 miles.

1977 Yamaha RD400 for sale on eBay

In today's era of jamming a lot of complication into a small engine, Yamaha's air-cooled twin is a statement of simplicity - 44hp from 398cc without fuel injection, overhead valves, counterbalance shafts, etc.  It still requires a poke with the right leg to start, though at least oil injection is standard.  Light construction helped the RD make a quick getaway, the twin downtube frame, suspension and brakes are all right-sized for the mission and keep the fully-fueled weight well under 400 lbs.  Historically noisy, Yamaha did what they could with the generous mufflers and airbox to quiet things down.

Looking a few years old rather than its decades, this RD has been carefully stored, and recently returned to rideability.  This required rebuilds of the carburetors, oil injection pump, and brakes - refreshingly OEM parts are still available.  What wasn't required were cosmetics, which are excellent and original.  From the eBay auction:

This is a 1977 Yamaha RD400 VIN # 1A1304892    Verified by Libby's in New Haven, Conn.
In dry storage for 18 years.
Full disclosure right front fender is scratched. The front brake lever has been replaced.
The right muffler does not have any damage. 
The gas tank has a minor dent in the pin stripe. There is no rust or paint chipping.  
tank inside is perfect, no rusting no tank treatments . also new petcock valve OEM.
New chain and sprockets.
New front and rear brake calipers.
Rebuilt front brake master cylinder.
New rear brake master cylinder.
New tires.
New clutch cable.
Rebuilt carburetors
New TDR reed valves.
All new vent and fuel hoses.
New battery.
Rebuilt auto injection pump.
Too much to list. Original bodywork, pipes etc...
Starts 1st kick every time.

The RD400 was skinny all over - seat, tires, and powerband.  But a blast if you stayed in the envelope, as reviewers claimed if it wasn't lifting the front wheel in second gear, there was something wrong.  As the other big three were in transition to lumbering four strokes, it out-performed the competition and undercut them on price.  An unrestored bike of this age is unusual, as is this RD's alternate color, interesting as Yamaha later adopted blue for their race teams...

-donn

Swimsuit Issue – 1977 Yamaha RD400




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