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Is there a way to make an xt600e 60hp? Is there a way to make an xt600e 60hp?
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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #1  
Old 4 Aug 2014
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Is there a way to make an xt600e 60hp?
As title says I'm looking for a cheap way that doesn't make my xts' bulletproof reliability... I already have uncorked it by installing a custom exhaust pipe with an fmf power bomb in the down pipes and an single 38mm mechanical Carb... any thoughts on this?
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  #2  
Old 4 Aug 2014
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A bigborejob with oversized valves and ported head and a better cam should get you up there, IF you've got a decent carb/airbox/airfilter solution.

But I wouldn't call it cheap.
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  #3  
Old 4 Aug 2014
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Turbo.
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  #4  
Old 5 Aug 2014
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60 hp will be $3000 to $4000easy, how fast do you want to go ? As Jens said major head work, high comp piston,new con-rod, big tube exhaust, bigger carbs, bigger(custom intake), no airbox, better crank, revamped transmission( the oem won't last long), improved clutch. Should I go on ? almost doubling the hp goes way farther than a few small mods. Then there is how long will it live ? 45-50 would be a little more realistic but it is getting up there in mods.

Turbo would work and be easier, but there will be damage till everything is sorted out. It'll still be $2500 easy.
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  #5  
Old 5 Aug 2014
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If you want that kind of power, get a KTM. For my use, mostly off road, some street around town, stock power and reliability is fine. Torque is what I want in this kind of bike and is why I purchased it back in '86, Moab and Colorado Trails.

JJ, I like the sound of your "FI project" oops, meant to keep it quiet....
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'84 XT600 is now bored to 2nd oversize and new OEM pistons and rings installed. No more smoking.
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  #6  
Old 5 Aug 2014
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back in the early 90's in supermono road racing, XT600 based motors did reach 60hp or more. Thats a very extreme, pure road racing motor that you wouldnt want to ride in the street and wont last long either.

doable yes, but it's a full blown project, flowed head, bigger valves, carillo connecting rod, titanium valve retainers, close ratio gearbox, etc. etc., so plan on putting aside a quite a few K euros... will be cheaper and more relaible getting a 690 ktm...
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Old 6 Aug 2014
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690 is pretty expensive here, the lc4 is cheap and have about 55hp, the 660smc i would recomend its only 130kg and 75hp price here for a 2003 is about the same as the XT same year.


KTM LC4 640 SM 2003, 17*300 km, kr 40*000,- -

KTM 660 smc 2003, 12*000 km, kr 45*000,- -
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Old 6 Aug 2014
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My buddys 640 enduro put out 49,7hp on road tires with pumpercarb, sxc exhaust ect. Theres still a long way to go, to get 20% more rear wheel horsepower out of that one.

The yamaha 660's put out around 55hp with different exhaust, and a airfiltersolution for a couple hundred euros. Thats with 60ccms more, and FI, and your're still not there.
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Old 10 Aug 2014
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Don't know what I will do... I love my undying xt and I don't want it replaced... smc are the worst... too unreliable... 690 is amazing for sure but with a price of 3500 euros too expensive for me right now..anyways will see what I'm gonna do after the summer is over in late October...
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Old 14 Aug 2014
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HONDA XRV750: http://youtu.be/zGcLMTd-tL8 just saw this conversion... since Africas' are pretty cheap here I'm considering of doing this... have to look into it more though!
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Old 21 Aug 2014
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I have just sold CCM R30 supermoto. Original engine was a 650 Suzuki freewind which CCM used. Mine was bored to 710 cc with a kent cam,flowed head ,one off carbon /stainless system and that was dyno'd at 52...
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  #12  
Old 14 Aug 2014
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Yeah with extra 10 hp it would do wonders
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Old 16 Aug 2014
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http://youtu.be/3B8oBMBV7LY this is mine with a fully custom exhaust from headers to tailpipe in which I copied fmfs' powerbomb... converted it in a single 38mm mechanical dellorto Carb... the improvement in power is staggering... couldn't believe it was my xt... what do u think?
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  #14  
Old 16 Aug 2014
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Quote:
Originally Posted by nickargas View Post
Xt600 2003 single carb first ride - YouTube this is mine with a fully custom exhaust from headers to tailpipe in which I copied fmfs' powerbomb... converted it in a single 38mm mechanical dellorto Carb... the improvement in power is staggering... couldn't believe it was my xt... what do u think?
Its hard to tell when you look at this movie, had to ride to tell difference. It seem to me like mine is pulling just the same, if you can tilt the camera down on speedo its easier to tell the acceleration. Are you on suicide mission riding so close to the cars?
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Old 16 Aug 2014
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Lol! You're right telling me off about my riding very close to the cars... this road is very big for Cretes standards so that's why I overtook them like that... will make a different vid with the headband but the tacho I'm using is pretty accurate and when it says 100 its 110 on the oem one and so on...
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