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3ECRFX

How to get tdc

6 posts in this topic

My dad rides a 2001 xr650r. I was going to check the valves and was wondering how to get top dead center, so all valves are closed. I have done it on my 250x but the 650 seems different.

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Its the same as every other Honda before and after it; remove the two plugs in the left side crankcase cover, one will be large, the other small, one will have a bolt inside and the other will be a sight hole. Rotate the bolt in a clockwise direction while looking in the sight hole until you see a small mark with a "T" marked next to it, that is TDC. Good luck.

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Make sure that the piston is coming up on the compression stroke when you line up the "T" mark. Don't confuse the "F" mark with the "T" mark.

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And there's only one cap on the left case cover of the XR650R--the sight hole cap. Some people remove the whole cover to access the flywheel nut for turning the crank (that's what the service manual says to do). I just remove the sight hole cap and peer through it with a small mirror while I turn the engine over with the kickstarter. It's easier to turn the crank over if the spark plug is out (although I usually don't take it out).

One way to know if your at the compression TDC instead of the exhaust TDC is to feel for slight play in all the rockers. Only on the comp TDC will all for have some play (assuming none of the valves have gone to zero clearance).

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