I still have to purchase carbs and an ignition. Big bore cylinder sleeve. - Travis is spot-on here...id be more inclined to trust jerry heiden tho than mikes...i installed a 750 kit on my 270° rephase-pods and freer flow exhaust-neighbours hate me-std cam rephased, original rejetted carbs, the difference at the wheel was noticeable but definitely not 20 percent...by feel also not 10 percent, but more responsive and a totally different characteristic. Thread starter rudy; Start date Feb 7, 2008; R. rudy If it don't fit, you're not trying hard enough! A big bore kit does reportedly do better than even an OEM cylinder in a big bar, big wood, stumping situation and reportedly in some milling use. And if you are looking for real power, stay away from MikesXS.com's big bore kits. I operated alongside Halco tuning and as Palma tuning and built many very big bore motors, etc. The Only complete bolt on Big Bore 750cc Cylinder and piston kit ever made for the XS650 Yamaha Modified limited production European Race Engine Cylinder Block has enlarged fins for improved cooling. Put some thunder in your XS bobber with an XS650 big bore kit. Super nice bike, and now with the power to really put down some rubber. Discussion in 'The Garage' started by cpotts454, Jun 1, 2010. Not so much a big bore kit as a rebuild with a little ass on it, but the idea is the same. Or, you can skip the boring all together with an XS650 or Vintage Yamaha replacement cylinder and piston kit. Easy to install. And this kinda thoughts just crossed my mind as well. NOT COMPATIBLE WITH EUROPEAN 533 OR EARLY MODEL 256 ENGINES. On a side note, the 78 xs650 has a better power-to-weight ratio, then my 92 883 did. Super nice bike, and now with the power to really put down some rubber. KITS FOR 2007-UP TWIN CAM® ENGINES_x000D_ Factory 2007-up Twin Cam® engines are equipped with 4-3/8” stroke crankshafts. Announcements. I too, don't know how and don't have a flow bench. We can turn your 96” engine into either a 103 or a 107”, and your 103 into a 107” simply by … Introductions. Larger capacity increases are possible, 840cc and 880cc are common. Being now the second largest bike Yamaha offers, the 650 should still enjoy healthy sales figures. The reason I want the Mikes 5th gear is not to give me an overdrive. ALL NEW PARTS! hello i am new here.. i have a xs650 that i bought for 300 all was wrong with her.. is that she was not charging... well tested the rotor and it was shorted.... so i replaced it from another bike out of the reckin yard.. rode it all summer.. till i could here this rattleing noise when you lug the bike alittle speacley when taking off.... anyone no what this cold be... i read on some forum … Our big bore kits can double horsepower (or more depending on the kit) and will be a night and day difference over stock bringing huge grins on the first ride. The ultimate complete bolt on Big Bore 750cc Cylinder and piston kit made for the XS650 Yamaha. Big Bore Kit for the stock cylinder. Reliability I can't see as an issue but she's gonna get hot. Its a big bore 750cc kit with new cylinders, pistons, rings, pins, clips, gaskets, the whole works. (You must log in or sign up to reply here. Wheels, Brakes and Tyres. I have the 750 kit assembled on my bench. It is still pretty amazing how quick and agile you can get around the mountains with such little horsepower. Technical. The bike gets hot in any kind of single track when i'm only in first and second gear. Discussion in 'The Garage' started by dlabkeeg, Dec 30, 2009. So cool, wasn't expecting that. The XS650 big bore conversion is of particular interest to anyone whose cylinders have worn past the maximum oversize. This kit will take a 107″ to a 127″ and a 114″/117″ to a 130″. In fact my ultimate goal is to have a final drive ratio in which 5th gear is slightly lower than stock. Xs650 653 750 Big Bore Kit. The skirt on the bottom of my barrels are shoeter if i remember correctly, i just lost heart saw my ass and put … First, how much hp does one make stock and a can you give me a rough estimate on how much horse power I can make with a big bore kit + hot cams + polish and port. - Moly 2000 Big Bore cylinder sleeve. Kit Fits: 1974-84 447 Type Engines. The New Cylinder Block has longer fins matching the Head Fin Length. I have the Heiden 750 big bore kit. The 790cc Big Bore Kit includes: Custom made, forged 9.5:1 piston with rings, wrist pin and circlips. If I go with a big bore kit it will definately be the big fin version. Gary Hoos also sells some pretty sweet JE pistons and will install new liners in your old cylinders if you are looking for a bad mofo 750 kit They are decent for a street bike, but not enough compression for what you pay for honestly. They say it just bolts right in, no worries. The Only complete bolt on Big Bore 750cc Cylinder and piston kit ever made for the XS650 Yamaha Modified limited production Race Engine Cylinder Block has enlarged fins for improved cooling. Build Threads. To start viewing messages, select the forum that you want to visit from the selection below. If your rebuilding the top end, go big bore, if your redoing the bottom end, do rephase. There is a 3- to 4.5-percent loss in power per 1,000 feet above sea level. XS650 big bore kit. -im not experienced enough in porting and have seen too many fuck-ups where 'profis' dont understand these heads and dont flow-test them properly, nor do i have access to a flow-tester​, -i dont want to change too much at once as you lose sight of what is actually happening...there comes a point where the law of diminishing returns rulz​. This Mikuni RS36 carburetor Kit will breathe a whole new lease of life into your Yamaha performance XS650 or big bore engine with an absolutely huge increase in power, whilst making it perform and operate as it should with no hesitations or flat spots. That will make the other four gears lower yet. This Big Bore kit will take an Bored out XS650 and give it 750cc of displacementBore Size: 80-82Overbore: 5.00mmSleeve OD: 3.4"Includes: 2 Forged Wiseco Pistons (w/ Rings, Clips & Pins)2 Big Bore SleevesTop & Bottom Head GasketsFits 1972-85 Yamaha XS650's Piston Dimensions: Displacement: 744cc Bore - Standard: 75.00mm Bore - Actual: 80.00mm Bore - Oversize: … $4.25 shipping. Another one of our engines, installed in a customers street tracker. How much HP do you pick with that 750 big bore kit? These pistons also have the option of a gas ported top ring to ensure a better ring seal at TDC when using a boosted motor, or higher compression, normally aspirated engine. 69 watching. I wouldn't say ported because all I did was smooth the castings. XS650 Big Bore, Rephased Street Tracker Another one of our engines, installed in a customers street tracker. As … Consider making a donation to help support the site. Another one of our engines, installed in a customers street tracker. If I'm riding a KTM 450 SX-F that makes 62 horsepower at sea level, it is going to make only 39 horsepower where I ride. Then the rephase idea cropped up, so I made a few. Feb 7, 2008 #1 Just found this at Mike's today. The 90 cubic inch kit (3.875" bore) is offered with full cast iron cylinders only as the extra strength of cast iron is needed due to the thinner construction. It also gets a free flow air filter and a custom exhaust. The ultimate complete bolt on Big Bore 750cc Cylinder and piston kit made for the XS650 Yamaha. Had them done to make my motor a 750, when i came to fit them they did not fit! These are very high torque engines and helped Martin Guilford to win the pre-1984 twin shock chairs championship in 2016 on an 840. Sutton cycle works oil cooler keeps my temps around 220 at 60mph but she does not like going slow. This has improved the performance of the Himalayan. Xs650 to 750 big bore kit revisited; If this is your first visit, be sure to check out the FAQ by clicking the link above. General. Super nice bike, and now with the power to really put down some rubber. I am just looking to do something new to my bike to get me excited about riding it again. Modified limited production European Race Engine Cylinder Block has enlarged fins for improved cooling. With their ‘76 street lineup, it seems quite altogether possible, too. Reliable engine life. Description. Basically i paid through my nose for these, got ripped off and paid way over the odds for them a couple years ago. Heavier pistons can surely make them vibrate more but high compression can really make them vibrate I have found................xsjohn. General Chat. Kit … ALL NEW PARTS! ). NOT COMPATIBLE WITH EUROPEAN 533 OR EARLY MODEL 256 ENGINES. The New Cylinder Block has longer fins matching the Head Fin Length. Consider making a donation to help support the site. Upgrade to the biggest bolt-in performance kit S&S makes for 1999-2017 Harley-Davidson® big twins (except 2006 Dyna® models and 2017 touring models). I think its silly though to spend thousands of dollars for 20-30hp that'll make your once reliable bike not so, when a modern triumph twin makes 70hp and probably would only cost $3000 or so in the right areas. The custom house machined out the existing liner from the 411-cc engine and this gave them the room to fit in an oversized forged piston with gaskets. The main modification done to this Himalayan however is the 462 big bore kit. The line currently consists of the 360 four-stroke twin, the 400 twin (updated RD350), the XS500, the XS650, plus the three-cylinder, four-stroke XS750. Great increase in torque along with overall horsepower. Contains an S&S 4” big bore cylinder kit S&S 585 cams, S&S Quickee Pushrods, and S&S Premium Hydraulic tappets to make the most of the added displacement. HONDA XR650R TO 680cc BIG BORE KIT. You may have to register before you can post: click the register link above to proceed. The biggest thrill isn't the power,it's when it's parked at the store or any where and people cant help but stop and check it out.All that being said,build what makes you happy,if it blows up there are plenty of replacement motors out there. Rear sprocket for 750 Big Bore Kit. The factory cylinder bore size of 3-3/4” yields the 96” displacement, which was gradually increased to 3-7/8” starting in 2010 for 103” displacement. (You must log in or sign up to reply here. Head and base gaskets are supplied. Modified limited production European Race Engine Cylinder Block has enlarged fins for improved cooling. Get everything you need in one package. Running a Rephased Crank and Cam, a 750 Heiden Tuning Big Bore Kit, Our "Mild" ported head, and a few other goodies. Yamaha XS650 Big Bore Cylinder Kit 750cc Wiseco 80mm Pistons Sleeves Gaskets (Fits: More than one vehicle) $465.85. ). You guys probably already knew that though. Custom made multi layer steel head gasket, OEM metal base gasket, tensioner gasket, cam bolt lock plate. Yamaha XS1 XS2 TX650 XS650 Piston Ring Set STD -Set of 2 - 256-11610-00 Repro (Fits: Yamaha XS650) $30.00. - Wiseco Forged 11:1 Compression Piston Kit. Big Bore Kit Features:. - Hot Cams Stage 1 Camshaft for mid-range to top-end power increase. I use my XS650 to pull a sidecar. Kit Fits: 1974-84 447 Type Engines. Hey Facebook people... We've created a group for XS650.com members to connect. I put in the cam from 650 Central and went in a cleaned the ports up. My question is how many teeth do I need on the rear sprocket? Free shipping. We have big bore pistons and rings from RIK, as well as standard-sized XS pistons, rings and head gaskets. Im considering what kind of horsepower I can make with a big bore rebuild. Thanks for the input. Big Bore They do not fit my 79/80 xs650. Hi, I just read your XS650 rephasing and tuning article and as the man who pioneered XS tuning in the U.K 30 years ago I have tried every option you mention and more. ProCycle 790cc Kit Of all the modifications we have made to the DR motor, we get some of our best results from bumping up the displacement. Find many great new & used options and get the best deals for Yamaha XS650 XS 650 750cc Big Bore kit 447 Heiden Tuning at the best online prices at … HAMMER PERFORMANCE highly recommends the full cast iron construction in the 88 cubic inch kit as well if you're planning to make in excess of 120 horsepower. Hey Facebook people... We've created a group for XS650.com members to connect. Do i need on the rear sprocket years ago viewing messages, select the forum that want! Fins for improved cooling to my bike to get me excited about it... My 92 883 did Palma tuning and built many very big bore 750cc Cylinder piston! 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