TTR 3AJ
 

I have just bought a 98 ttr600 belgreda has 3AJ stamped on engine Ive had the bike a couple of weeks and one of the exhust valves has hit the piston.I think my engine has a high lift cam.I am thinking I would be better to put a standered cam back inn would this be the same as a cam in any of the xt engines? can any one tell me where I can get one?any views about high lift cams in these engines? what differences between XT and TT engines?
Thanks John

Hmmm that does seem odd. 3AJ is an '88-'90 era XT engine. Very odd that a '98 bike should have an '88 engine?

Hi-lift cam should not hit the piston unless you were giving it a hard time at high rpm? (be honest).

Later model TT engines (such as the engine your should be) are narrower than XT engines.

All seems very odd...

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Barry
3AJ Tenere

nothing odd about it.
every xt-engine since 1988 is equipped with the 3AJ cylinder, also every tt model after 1992.
so, cylinders and -heads (2KF) are the same but differences are crankcase, gear ratio, camshaft etc.

regards
klaus