*Failed Cranks Why to properly build and weld an XS650 Crank. The engine produces a maximum peak output power of 50.00 HP (36.5 kW) @ 6800 RPM and a maximum torque of . The Stage I bike is good-handling, fast, responsive . Shell/JE 700 piston sets, top quality forged pistons. Subscribe . The "Special" cruiser model was introduced in 1978 and produced through 1985. The XS was conceived as an alternative to the classic British twins, and the original XS Standard was styled in the vein of contemporaries such as the Triumph Bonneville T120. I have these for 447 and 256 motor they are all 10.5 to 1 compression . Asheville, North Carolina Seller assumes all responsibility for this listing. Yamaha - Xs650 Select a Year. When US Commodore Matthew Perry engaged in a bit of American gunboat diplomacy back in 1853 the Japanese were forced to emerge from their two hundred and fifty years of isolation from the world. Key in the ignition, pull the choke and hit the little black button (or kick her over if youre legit). Not to mention variations from ignition, exhaust, cam and carbs etc. Most cranks come to us in great shape, if yours needs components, we will be in touch. Performance Tool W1189C SAE Offset Distributor Clamp Wrench. Part# 302957 for your 256 motor $300.00 (1 LEFT), Part#347370 for your 533 motor $300.00 (1 LEFT. As with all performance parts it is always good to check clearances. Forged 80mm. Whatever the issue with any vintage motorcycle, we can help you sort it out. The New Cylinder Block has longer fins matching the Head Fin Length. It feels like the Yamaha XS650 has been around forever, and that's not far from the truth: it was offered in various guises from 1968 until 1985. The set with the 135 main came in the 78 or 79. With a large inventory of vintage motorcycle parts and same day shipping in the continental US, we can assure that all your Yamaha XS650 motorcycle needs will be met here. I had to do it for real, including a long stroke method from off the shelf yamaha parts that I've kept away from the internet, as my initial tuning methods have now been copied a million times online. This is really a function of throttle position. We have engine case bolts for many vintage Japanese street bikes. Some of the writing, from the likes of Dave Minton and Mark Williams in the UK, is excellent and the American articles do feature better photography. Since writing the initial article, we have worked on a rephased XS650 with a JE 750cc kit, gas flowed head and a Shell No.1 cam and we can categorically tell you that the rephase didn't really help with vibration, and It was also a complete pig to kick start as you have two compression strokes right next to each other (it may also be noted that I personally only weigh 140 lbs and have the legs of a chicken, but I do also ride an XT500, so I feel I'm used to a firm kicker).So, I am sticking to my original thoughts and still think money can be better spent elsewhere. If you start with a 495 lb Special and cut that down to 380 lbs (very do-able), that would be (assuming a stock HP of 48, which is what most good Specials dyno at) would give you an effective 64 HP (compared to the stock machine), which is highly modified XS650 territory. Theres also a full custom exhaust system, and the engines been bored out, had its compression raised and been tuned for maximum torque. . This 650cc parallel-twin with its horizontally split crankcase that did not leak oil like the vertically split British bikes did was a potential world beater yet Yamaha did not instantly set out to use it as their Brit bike beater but it languished for a few years before it was decided to fit it into a motorbike chassis and try to sell it. If only shipping a cam, $12 is the return shipping cost. A rephase is when you change the configuration of a crank or camshaft to change the time an engine fires.Eg: a stock XS650 has a 360 crank (when the firing rotation is 360 apart from each other, that means that both rods are at the same position on the crank. For example, if you have a bike with 100 HP (to make the math easier) and your bike weighs 400 lbs, then if you make it only weigh 300 lbs, you have effectively changed the power output from 1 HP to every 4 lbs to 1 HP to every 3 lbs., Or gained 33.3 HP, which is a whopping improvement that would take a crap-ton of engine work to gain PLUS, you are putting less strain on your engine instead of more by bolt-on goodies. But the air-cooled, parallel-twin engine has an even longer historyit was based on a 500cc German Horex copied by the now-defunct Hosk Motorcycles. ***All of our exchange services are based on cash/check/money order pricing. greeves motorcycle parts. Strawberry Shortcake is about 300 lbs (as it has no swingarm etc. The 2into 1 usually needs a jet change. grizld1. This would be a great basis for a cafe or chopper or the valuable parts (seat/gauges) can be sold. With good head work, well set up carbs, a mild race cam, free-flowing exhaust, better ignition and a 700/750 kit you will find yourself on the back wheel quite often. [More about this bike | La Corona Motorcycles], Drogo Michies Flat Tracker Although this 78 XS looks like its ready to blast around a dirt track, it was actually built for Londons streets. 25 watchers And a bit more reading, 277 Rephased Goodness from the vaults of the internet! i really enjoy my 79 xs 650. it has both electric starting and kick start. If left unchecked, they will fail. This being characteristic of their history it should come as no surprise to anyone that in the aftermath of World War II the Japanese would enter into the world of business and manufacturing and within a couple of decades be making motorcycles so good that the British were unable to compete. Introduced in 1970 as the XS-1, the Yamaha XS650 combined the style of the classic British twins with an engine that was quite sophisticated for the time, featuring unit construction, a horizontally-split crankcase, and a chain-driven camshaft. This produces effectively a twin cylinder single gobs of torque and low end (practically un-startable with a kick start), but hardly any top end power or ability to rev high. $22.94. La Corona also removed the starter motor, fitting an electronic ignition to make kick starting easier, and relocated the ignition to the new under-seat battery box. Last one. Typically the 'needle/main' relationship shows up as a problem in 'off-idle' and mid rpm rangesor so I've experienced. Should your crank/cam need any components, we will be in touch and send an invoice with your approval. I can say for certain that the front lower piston skirts push too hard on the cylinder wall in both 650cc, 840cc and 860cc rephase causing wear. Brand New. Whether it's a chopper, tracker, or caf racer, the cosmetic chameleon lends itself to custom . 120.00 + 12.50 Postage. Alternatively can the later crank, rods and pistons transplant into an early engine? The Crank and Cam are both rephased for a matched set. $1,100.00. All Carburetor . Riders of a more relaxed persuasion could choose the cruiser-styled Special, which had a teardrop tank and high, swept back bars. So early heads/cams must be rare finds? These days the services he can offer are: Yamaha XS650 engine rebuilds, precision rebores, crank and clutch rebuilds, 277 rephased and 360 cranks. Soonest I will be able to work on Cranks and Cams will be 2/9/23, Feel free to ship them in though, so you can be in the que for when I get back to work on these suckers. Live Well. Kit Fits: 1974-84 447 Type Engines. The kick start lever has a BMW pedal attached to it, and the Classified Moto logo on the tank uses Thrasher magazines font. Silodrome was founded in 2010 as a website dedicated to Gasoline Culture and all it entails - We write about modern cars, classic cars, motorcycles, racing, gear, gadgets, clothing, boats, planes, airships and the occasional submarine.Read more Silodrome 2023. all rights reserved. But he's just thrown us a major curveball with his latest project: a vintage Schwinn-inspired Yamaha XS650. Brooklands Books 15 ISBN: 1 855 20574 2Read more Reviews, Letters, Opinion, News and Features online at www.classicbikeguide.com and in the August 2020 issue of Classic Bike Guide on sale now! $157.04. That blue-black smoke emanating from your tail pipe is a major issue. Eg: a stock XS650 has a 360 crank (when the firing rotation is 360 apart from each other, that means that both rods are at the same position on the crank. Part# HRS stk-465 $345.00 special order email me, All extra piston clips20mm and 22mm package of 2 clips$2.50. Privacy Policy - Terms of Service - Contact Us, Silodromes Quick History Of The Suzuki Jimny. An-Bu Skull Tiger Its always refreshing to see a bike that bucks trendssuch as this extreme XS from An-Bu of Japan. Yamaha XS650 Finds New Life As Custom Retro Racer. The engine has a 360 crank which means the pistons go up and down together, sort of like the twin cylinder bike you have when you really want a single. Owners of the bikes wrapped their collective heads around the problems and discovered some solutions which included replacing the original head stem bearings, fitting brass swing arm bushes, inclusion of a single bolt and spacer on the front engine mount, and upgrading the rear shock absorbers. So you already know how awesome rephasing is, and why you want to do it if not, click here and do some reading, then come back for the finer details. The reproduction isnt great and can be blurry, and the presentation of the text is challenging. 1970 Yamaha XS650; 1971 Yamaha XS650; 1972 Yamaha XS650; 1973 Yamaha XS650; 1974 Yamaha XS650; 1975 Yamaha XS650; 1976 Yamaha XS650; However, even the best casting can be greatly improved by a mild casting clean-up, matched intakes and nicely cut 3 angle valve seats. The power curve would be very different too, having a steeper curve for the stock crank (dropping off at 8,500 RPM) and a more linear curve for the rephase (dropping off 500 RPM later). you never said that you ensured it is timed properly. eBay item number: 404245980833. I don't know why. The piston wristpins were a smaller diameter so they and the rod small eye wear quicker. The engine was narrow and tall giving the bike a slim profile and making it easy to manoeuvre. As you level off the choke, your ride starts to hum. The group consisted of Fabien Tourlan, otherwise known as "l'Atelier Les Bcanes", who specialises in vintage motorcycle restoration, Aymeric Romanowski of Atelier WIK and Bernard Christy, who deal in parts, and David Gallet Dadygraph and Laurent Chapus of Neway Designs . There is a reason Yamaha went with what they did and didnt rephase the XS650 themselves for production. Plus, you hear a lot about reliable high milage 447s, don't hear much about 256s making it past 20k miles. Pikes Peak winner builds a 775cc twin motocross machine! 28/02/2023. Flat track specialists Red Max Speed Shop supplied a Champion seat, Trackmaster tank and Koni rear shocks, and took care of the frame mods and powder coating. Assembly Weight approx. Our engine cover bolt kits as bright, stainless-steel Allen heads that will make your engine shine and last for ages. It may not display this or other websites correctly. Core charge if you don'thave a cam is $50.00. There's a pinging sound coming from your engine. As for if a rephase gives you any more power? And, to some degree I acquiesce to both. Pro-1 Racing Engine Builder Series. Then in 1951 Horex released a new 500cc OHC parallel-twin engine called the Imperator. Yes, get UNIs. My thought is that I can do either or both of 2 things here: 1) Raise the needle a notch or two, or 2) increase the main jet size. Kits come with pistons, pins clips and rings . For the uninitiated what is the best year of XS650 engine and why? It outperforms any other free-flow bike pipe on today's market. Fat on both ends, lean in the middle? This is an exchange item. If your beloved vintage motorcycle develops an odd pinging sound, investigate immediately. Well, you would literally have to build the same engine twice and dyno it to prove that, as every casting on old Japanese bikes varies quite drastically. Your comments in post #9 are most helpful..but do leave me with a question: You mention '20s' and '40s' and I'm not quite sure what you mean about that? Design limitations are found in exhaust port shape and cross sectional area-too large. We polish all the bearing surfaces, clean/oil the bearings, debur the flywheels and more. So long as the camshaft is in good shape, we then machine and rephase the camshaft on our in house fixtures to match your rephased crankshaft. + Postage. If you think you hear something, you almost certainly do. Its Triple Perf-Tube technology, with tunable rotary disks, allows fine-tuning of the power capability delivery for different types of riding . XS650 Mikuni VM Roundslide 34mm Performance Carb Kit Tuned By TC Bros. $434.95 27. $135.00 plus your old cam.