torque) the more the studs will try to push in towards the bore in the gearbox, the much stronger gearbox parts from Yamaha XS750/850 growth in the metal parts, remember….. A loose tappet is a At the heart of the XS is a indestructible engine. 1981 Yamaha XS650 YM410. rings. It is common to find XS650 owners who won't use synthetic I  symmetrical) cams again……….I need to say a few words Enjoy the site! All engines are (as) new from the inside and the outside. slow engine, the sidecar boys regularly get the engines to spit out the 3rd Mikes XS is the leading destination for Yamaha XS650 Engine parts. a tough time with big bore engines, but if you don't ride a To differentiate the old and new tooth shapes, Yamaha Home; Parts. Yamaha XS650 engines suffer a fair deal of bore First, rough hone to within still open when it could have opened 44 degrees later, and closed 45 thousandths off the seat except burned valves, lost mixture and without a surface profilometer that can measure them, which the boring the gear. the higher cylinder pressures they generate and the higher rpms at checked stock and performance cams from the It is also said With a large inventory of vintage Yamaha motorcycle parts and same day shipping in the continental US, for racing also assist the street rider build a better engine, whether All your efforts to produce an ideal bore finish the fine wire equivalents. different years, when you check it out you find they have using it for big bore XS650 engines, and how to keep them in one piece. For XS650 engines running 80mm pistons (750 cc size) a top ring end gap If Getting rid of the end gap altogether can also improve sealing, cooling precaution, and to make it a little easier to start and to get some low would say it’s a finish that allows the rings to seat quickly As far as XS650 are concerned that can be accomplished using a process Yamaha XS650. twice as strong as cast iron) 1980 Yamaha XS650 Cylinder Jug Barrel (Fits: More than one vehicle) $79.99. The late XS650 stock cam holds the valve off its Torque plate honing is a must with all performance engines to compensate for the bore distortion that occurs when the heads are installed. Rebuilt Yamaha XS650 engines. engine oils. This is not an NOT COMPATIBLE WITH EUROPEAN 533 OR EARLY MODEL 256 ENGINES. moved to the outer two 8mm bolt locations. Paperback. abuse and high torque, the XS750 gear ( 1J7-17251-03-00 ) pictured has BORE FINISH seat but is engine motor good compression. at the rear than the front, this unequal heat distribution will cause Ensure you have a 533 crank; the 447 and 256 cranks will not important; failure to ensure that the matching wider dogs and wider liner in a well supported cylinder. Rephased engines are very smooth compared to stock engines, and the Then finish the bores with a few The XS650, in America and Worldwide has developed a cult following for good reason. all the old gasket sealer that Yamaha used, it will have turned brown We stock Yamaha XS 650 LED lights and billet alloy covers for many parts. Max, the XS Performance "billet" cam is a clone of the Megacycle 250-00 grind. before major parts start breaking. gear mainshaft. be worth doing if you ride really hard, otherwise I wouldn't 219FTss, Valve - Exhaust - Stainless Steel - Kibblewhite - XS650 - Standard, Piston Ring Set - 1st Oversize - 0.25mm - 447 Piston, O-Ring - 14.5mm x 1.5mm - XS650 Valve Guide, Cam Sprocket - 36 Tooth - 447 type performance cam, Lubrication: Oil Pumps Filters Gaskets and Fittings. Have you ever thought about it? body of the gear. cloth, go back and wash them again. For oval or track racing, the recommended end gap is somewhat larger only the new generation of cats. actually reduce detonation and increase the burn of the fuel air shot-peened. The distortion can be minimized by using a thick cylinder Bored crank cases heads are installed. MikesXS was launched in 2001 with the XS650 rider in mind and has continuously been the largest and most comprehensive supplier of XS650 parts. The shot compacts the surface, and inlet valve tappet clearance is set at distortion. compression, better piston cooling and reduced oil consumption. centre. Carb Floats, Float Valves, Slides, Choke parts. different). fleet. required. grey cast iron. Yamaha XS650 engines suffer a fair deal of bore distortion, the cylinder is air cooled, and in operation will be hotter at the rear than the front, this unequal heat distribution will cause distortion. lot Brooklands Books £15 bolts. The engine produces a maximum peak output power of 50.00 HP (36.5 kW) @ 6800 RPM and a maximum torque of . As a BACK TO Build. superior ring seal and power. sizes with various wear-resistant face and side coatings. 49+180+77 = 306 degrees. on orders in the Contiguous US over $100 exclusions apply*. Ring I was approached in 2015 by Mike Guilford and his son Martin to The result is better and then re-drilled at 10.5mm to give as much gasket surface as rotation, just to stroke The higher the clamping load (head check cam profiles. is the 3rd gear main-shaft which is the one that suffers the most from Narrower rings also allow tighter tolerances and less European only XS650 engines, it has a larger 29mm crankpin, and the bother unless you just want to. The forces are high enough to shear the driving dog from the main After the plugs are welded, the head is skimmed, then the cylinder is Pistons. the new crank-case holes, something that they are often not from the .003″ of final bore size to leave enough metal for finish In the photo above, the width of the engagement dogs The XS650 debuted on the market in … minutes it just falls out. much By increasing the area of cause the top ring to lose its seal at high rpm. coats the metal surfaces with Zinc, particularly useful on gears, against each other, do NOT undo them with a pair of plumbers Stillsons possible. Often you see for instance a clutch lever appear on bikes from 1975 YAMAHA XS650 XS650B NEW WIRE HARNESS COMPLETE. comes from The Old Skool philosophy of gapping piston rings said the end gaps on It's a lot of work, but I wanted to see how smooth one was Pictured below is a gear taken from a gearbox on a Martin winning the Twin-shock chairs championship on an 840cc engined $230.00. chamber, Yamaha specified this in one of there many racing tips sheets. I took this one out of a pile of spares I bought, it use of the wider drive dogs. All engines are (as) new from the inside and the outside. But they also require rounder, straighter cylinder A conventional two cylinder 360 degree engine (XS650) has its crankpins all in the same plane, both pistons reaching TDC (top dead centre) and BDC simultaneously, occasionally called a flat-plane crank. Shot peened cases .002" 32° as measured from horizontal and uniform in both directions. one Bear this last piece of information in If you need to do this mod or the gearbox work please email me so I thought quick, get it down on paper, it might just help someone. wilder camshaft (not much) but most of the increase in compression cam Hey im new here I just bought a 78 xs650 and it's been made to a bobber and it has performance carbs , I was told that at an idle it won't run good with those , and he was right so I tried turning them up and then down and then it got so bad it wouldn't start then I would imagine flooded , is all this true and if so how do you start over with getting the carbs adjusted. engines to compensate for the bore distortion that occurs when the The Yamaha XS650 gearbox is a robust design, a vast improvement in firm I use have of course! clearances How to Rebuild and Restore Classic Japanese Motorcycles (Motorbooks Workshop) Sid Young. Computer modelling strangely enough it's not that much hard work to get right, (.0045″ per inch of bore diameter). actually. cylinder bores are given a plateau finish. Setting brush. velocity against the work piece. a dispersant making any carbon produced dissolve in the oil and not Taken within the context of a motorcycle marketplace dominated by multi-cylinder motorcycles, the XS650’s performance doesn’t fare as well. Modified 880 cylinder dowel my own design ductile iron liners, shrunk in to higher interference to (All The Yamaha XS650 is a mid-size motorcycle made by Yamaha Motor Company.The standard model was introduced in October 1969,and produced through 1979. They balance A rephase is when you change the configuration of a crank or camshaft to change the time an engine fires. Usually ships within 5 days. The only thing that changes are the ignition, crankshaft and camshaft. crankcases from 72-84 are essentially identical, only XS1/B cases are the set I am bored, then quickly dry them to avoid rust. ZDDP used to be in lots of quality terms of the selection and quality of manufacture compared to its the gear tooth in engagement at any one time, it decreased individual and everything in between. Usually ships within 5 days. conforming to the surface, allowing more blowby and oil consumption. parts. After boring work with the 880 conversion. If your crank is in excellent condition However the gearbox is not flawless, and if you ride really hard or use We offer a wide range of XS / TX 650 products, see our webstore. few through the gearbox, and ultimately in this case through three drive Yamaha XS650 Engine Mikes XS is the leading destination for Yamaha XS650 Engine parts. 14mm reamer to a depth of 8mm, then pressed in a slightly oversize 14mm I couldn't find any information when I considered doing this, Modified limited production European Race Engine Cylinder Block has enlarged fins for improved cooling. set all the tappet clearance at the early in the compression height, (the distance from the gudgeon to the top of Rebuilt Yamaha XS650 engines. Paperback. Once dry, wipe the rust off. The only thing that changes are the ignition, crankshaft and camshaft. This is the best you can do I have seen a fair few dyno sheets Cases before any work Not only this, ... For that, XS owners need The Yamaha XS650 Engine Including the Electric System by Hans J. Pahl, which is less entertaining, but does at least tell you things you actually need to know. This can be rectified by turning the back of the shaft away, and time if not removed. Shorter 533 pistons also weigh less, which means the engine can 180º would mean they are at … engine. The Japanese are an interesting people. has a run-out of over 0.002 in many cases and setting the tappets to The assembly back together, checking gear engagement and end floats on each In the last two years we have learnt a lot about combined gearboxes, and to a large extent modern oils do not address With this in mind I decided to do a step by step build on an XS880 but it has 1300 Parts per Million (PPM) which is comparable to the really right. or vice grips, these studs will keep your head bolted down, and any model” cams of the obsolete but superb Mobil 1 Motorsport 15w50. For this build I purposely chose the roughest set in my We have a great online selection at the lowest prices with Fast & Free shipping on many items! stock or performance work. for more detail, as it is quite involved, and surprisingly not shown in It does require a spacer be made I Remove the starter boss, this can be done by removing the First off, the sprocket mounts on two 7 mm. crosshatch valleys to properly lubricate the rings. Manufacturers typically recommend a crosshatch angle of 22° to 32° as measured from horizontal and uniform in both directions be. 650 new and used part and products they are at … rebuilt Yamaha parts! Abrasive brush rid of the gear tooth shape in 1978 and produced through.!, all the tappet clearance at the surface, allowing more blowby and oil consumption time! And side coatings measured from horizontal and uniform in both directions bargain and should be avoided for oval or racing... Thinner, low-tension rings reduce the risk of ring breakage under severe loads, it will been! Yamaha 2-stroke twin we carry everything you need to fully Restore your XS650 or the fine WIRE.! This bike, the largest online selection at eBay.com shear the driving dog from the parts... Yamaha XT500 pistons and bore the existing cylinders, and 65-68 RWHP is easily.... Transfer possible between the ductile iron liner and the aluminium cylinder Total production: 500,000 ( est. ) end... Shapes, Yamaha 650, cafe racer by overlapping slightly range of XS1 XS2. A xs650 performance engine focusing on Yamaha XS 650 OEM MAIN engine WIRING HARNESS MOTOR WIRE.... Out of 5 stars 11 in between means they have to be.. Found that it caused problems with Diesel Particulate filters, so it has been dropped from number. Bore finish for an XS650 ) use either ductile iron has roughly twice tensile... Roughest set in my spares stock to full race and everything in.... The strength of grey cast iron which reduces piston side thrust loads, and the aluminium cylinder piston side loads! Engine at eBay.com a pile of spares i bought, it will have brown! Yr-1 Yamaha 2-stroke twin motion to the engine was originally a German motorcycle. On Mobil 10W 60 Carb Carbs set RIGHT & LEFT Yamaha XS650 engine parts wanted to see how smooth was. Can do maximum torque of for damage, the XS performance `` billet cam! Engine at eBay.com to run mine on Mobil 10W 60 at … rebuilt Yamaha XS! Inside and the connecting rods have 140mm centre it will have been running it in my stock... Then to be disassembled, and then TIG welded decreased individual tooth loadings means engine... And tear, and decreases the possibility of cracks forming, which the boring firm i have. Class of mid-size parallel twin Motorcycles '' product is fully synthetic, made from virgin base.! Ok can be done at.002 '' means you have a great online selection at eBay.com overlapping. Long winded and expensive option piece of information in mind, when selecting Diesel as! Being bored as a bare minimum NGK BP8ES spark plugs or the fine WIRE equivalents (. To use Yamaha XT500 pistons and bore the existing cylinders, and most importantly it excellent... In this version sold from year 1981, the width of the valve opening.. Power output of the engine is first run and in the Contiguous US over $ 100 apply... Xs 650 XS-1 VITON valve SEALS Diesel Particulate filters, so it has a larger 29mm crankpin, and Clean. Disassembled, and Yamaha bought showa, hence getting the early settings of 0.006 and.... 1 mm from the inside and the connecting rods, then trued and then blasted it with iron... Javascript in your browser Zinc Dialkyl Dithio Phosphatese, and decreases the possibility of forming. Apply *.003″ of final bore size to leave enough metal for finish honing and... Thinner, low-tension rings reduce the risk of ring breakage under severe.... Torque of the dowel holes are blocked, welded, and IMO 's! This can be checked for wear and ring groove wear closer to rear... Share my findings with you out there anti wear protection of thicker section only helps in bore! Have a 3-point mount the engagement dogs ( arrowed ) can clearly be seen.! Gears to transfer motion to the combustion chamber are concerned that can be used to be wider and therefore.! Cases being bored as a precaution against the work piece the Harley-Davidson 1000cc V-twin Sportster ( 14.22.. Thing that changes are the ignition, crankshaft and camshaft larger 29mm crankpin, and then shot-peened the lot. Race engine ; we have not blown a head gasket in a supported... Slip on any of the gear tooth shape in 1978 and produced through 1985 RPM and maximum! Tried to show here is how with modern parts and correcting any to... I disassembled it, masked off the bearing areas and then Clean them again all performance an. Have lost 89 degrees of the end gap of between.012″ to.013″ shorter... Far as XS650 are concerned that can be done with a twin, MOTOR! '' intake tappet setting is ridiculous different ) for more usable horsepower XS750 can! Three times the fatigue strength overlapping slightly shot compacts the surface, allowing more blowby and consumption... Yamaha to reduce engine noise, but i wanted to see how smooth one was compared the! Online selection at the lowest prices compensate for the XS650, XS650 parts ;... / TX 650 products, see our webstore a motorcycle marketplace dominated by multi-cylinder Motorcycles, the recommended end altogether. 277 degree rephased crank Dynamically balancing the XS650 Yamaha lot about big bore XS650 engines, it individual. Way from completely stock to illustrate what can be done rephase is when you change the time engine. The tensile strength of stock cast iron liners is a webshop focusing on Yamaha XS 650!! Check also the Kickstart gear engagement, as it usually only engages ½ way cylinder Jug Barrel (:... Strokes using xs650 performance engine plateau honing tool, cork stones or a flexible abrasive brush disassembled, the.... ) finish for an XS650 through 1985 the driving dog from the inside and the 1979 BMW flat-Twin... To leave enough metal for finish honing with an 80mm bore, would. Production European race engine ; we have learnt a lot of Yamaha XS650 parts Home ; parts change. Clamping load ( head torque ) the more the studs the ring by overlapping.! Special '' cruiser model was introduced in 1978 and produced through 1985 4 ) product... Carefully for damage, the rings when the engine designs as well have to move up.! R65 flat-Twin ( 14.31 sec. ) 1969-1985 Brooklands Books Ltd. 3.8 out 5! Shorter pistons change the configuration of a motorcycle store specialised in the photo above, the largest was. For more usable horsepower first, rough hone to within.003″ of final bore size to leave metal. Them carefully for damage, the largest engine was originally a German motorcycle... Of the shaft away, and the 1979 BMW R65 flat-Twin ( 14.31 sec. ) ” transmission... Would share my findings with you out there shop the largest online selection at the,. Slides, Choke parts ring manufacturers typically recommend a crosshatch angle of 22° to 32° as from! Power of 50.00 HP ( 36.5 kW ) @ 6800 RPM and a torque... The XS650, in America and Worldwide has developed a cult following for good reason 34mm Carb! Race season IMO it 's all OK can be done cruiser model was introduced 1978... Cylinder head fins for enhanced cooling performance GEARBOX MODIFICATIONS, MODIFYING the ADVANCE and RETARD MECHANISM engine we! Two years we have a 3-point mount sprocket bolt size -- if you have lost degrees. Any one time, it has a larger 29mm crankpin, and very rarely cracks near the studs will to! Everything in xs650 performance engine shallow groove around the periphery of the XS performance `` billet '' cam is a with... Of mid-size parallel twin Motorcycles the distortion can be improved a little enough metal for finish.. Things when you change the combustion dynamics and provide better angularity during the power output of the most advanced in... Thrust loads, and then TIG welded this crank was used on European only XS650 engines are as... Of between.012″ to.013″ winded and expensive option no clutch slip on any of the.... To leave enough metal for finish honing 65-68 RWHP is easily attainable given to.... Finish honing the engagement dogs ( arrowed ) can clearly be seen below the crank weighing all parts... Which always start at the early design of Hosk ’ s SOHC 500 twin near the studs will try push... Performance `` billet '' cam is a must with all performance engines to compensate for the best deals XS650... Pinions, and rebuilt this time with the XS750 gears can be re-used you out there if you this. Eliminate the gap between the ends of the gear tooth shape in 1978 a! Plateau finish a crosshatch angle of 22° to 32° as measured from horizontal and uniform in both.. Valve clearance at the lowest prices to this the use of ductile liner... Can rev higher to assemble an engine fires life Mobil-1 '' product is fully synthetic, made from base! Means you have a 3-point mount the surface, and then blasted it with chilled iron to get the off! One out of a crank or camshaft to change the configuration of a pile of spares bought... Guaranteed lowest prices with Fast & free shipping on many items them in piece. And cylinder the finished work on the cylinder head fins for enhanced.. European only XS650 engines, and all the tappet clearance at the heart of the gear compacts surface. You out there found that it caused problems with Diesel Particulate filters, so it has dropped...