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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 17 Mar 2015
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xt660 head into xt600
hello to all from Portugal,
Im trying to achieve more power in my xt600e (3tb) engine.
i have all new with 101mm wiseco piston and new sleeve, bigger valves and só on but i really want tó know ir i can use raptor or xt660 camshaft (maybe hotcam) in my engine?
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Old 17 Mar 2015
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Yes you can buy hot cam and new valve springs for the 3TB, carb needs modification or replaced for upgrade. http://www.webcamshafts.com/mobile/m...0_sohc_4v.html
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  #3  
Old 20 Mar 2015
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Thank you for your information,

Im trying to do a good engine with a light bike.

-wiseco 101mm (already have)
-ported head with heavy duty valve springs and intake valves +1 (can´t find bigger exhaust valves..maybe raptor 660?)
-race camshaft
-FCR 39 with grizzly intake manifold
-inox custom exhaust pipes (already have)
-fmf factory 4.1 titanium slip on (already have)
-performance clutch with heavy duty springs.

i want to get some help with this..

This is for a xt600e (3tb) with custom parts and lightned
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Old 21 Mar 2015
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Sounds like a good project, good luck
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Old 27 Mar 2015
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mmm... everybody seems to miss out on the fact the the raptor 660 motor is a five valve water cooled, essentailly a old XTZ660... or is it me who misunderstands your cam question...

the 5 valve cam will obviously not work with a 600 4 valve head

the current yamaha/minarelli 660 water cooled four valve motor is not used in yamaha's raptor, only in the italian assembled XT660R/Z and MT-03.
But i dont think the cam would work at all on an air cooled.



your best bet for tuning parts in europe is KEDO
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  #6  
Old 27 Mar 2015
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Whats this about 660 something not fitting the 600 something?
Anythings possible


As for the cam , I'm 85% sure it will fit (I have one coming to test the auto decomp setup) , the one lobe is wider on the 660 but that's a non issue . They put the fifth valve rocker "Y"-ed into one of the normal valves so there still is only four rockers, thus 4 lobes on the cam.
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Old 28 Mar 2015
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Then its possible to use different rockercover and heads togheter, maybe its not importan than alot of people say about only use same head and rockercover?
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Old 28 Mar 2015
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Nah, the heads and rockers have to stay with the original cylinder from the model it came from. Those are different due to one being water cooled and the other air. Yamaha just used some key dimensions throughout though so some parts can fit . Probably so they could continue using stuff from the old parts bins.
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Old 30 Mar 2015
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interesting but after all, it's not like you ARE actually using a 660 cam...

the reason i am say it probably will not work is not because the 660 cam will not fit in the 600 head but for the fact that 5 valve head has a much closer included valve angle so rockers will very likely have different geometry.
3 smaller intake valves means also that valve lifts are likely different, most likely lower than a 600.

when you have the cam in your hand, measure valve lifts, specially in intake side.

Both my 600 and 660 motors and in their frames, so I cant check

I might be wrong of course... will not be the first time, but with the good cam offerings for the 600 from megacycle, web cam, kedo, hard to see the point in the transplant

PS - just out of curiosity, nice looking motor and oil filter conversion, but what does that picture actually explain? are there 660 parts inside?
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Old 31 Mar 2015
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That's what I wanted to find out . I want to see if I can use the auto decomp on a 600 cam at least, if not the whole cam , seems the starters have a hard time turning these over without some sort of pressure relief. The cam specs in the service manuals show the Exhaust being pretty close to same lift but the Intake on the 660 is about .03" less than the 600, rocker arm ratio could be the reason.

That motor is an entire 660 bottom end out of a Raptor with the topend off the 600. Cylinder bored to take the 660 sleeve so 100 mm piston inside, plus reverse ! More or less a shits -n - giggles motor build to see if it can be done. Right now it's all ready for running(before I cut up a frame too much for it to fit) but I have a cam timing issue ,another reason I need the 660 cam, to see where the lobes are timed. It isn't the same as the 600 so the cam gear marks don't line up. Have the Raptor harness and will need to graph on a turn signal setup to it, but lots of cdi options. I'll machine a block off plate for the water pump, but need to get things sorted before continuing.
Last edited by jjrider; 31 Mar 2015 at 01:58.
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  #11  
Old 31 Mar 2015
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other than the water pump bulge and drive on the cover, 660s bottoms should be quite like late 600s

Having a similar problem with my xtz660 based road racer, with 14:1 it's a bitch to start. there's plenty of itneresting manual decompressor options from the raptor guys, they might be simpler that the built in cam mech that tends to disintegrate and take out whole motors...

shame that with the TZ250 twin spar frame hugging the head in my bike, cant really use them!
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