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my 2000 xr100 is having problems


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my 1999 xr 100 was burning oil like crazy and one day it wouldnt idle at all, i messed around with the carb and then finally took the spark plug out and it had carbon all over it, i put a new plug in and it ran great, it may be a carb problem but check the plug first

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thanks, i cleaned out the carb, and now it runs and idles fine, the idle problem was a crack in the manifold between the carb and the engine, so i fixed that. now, it runs fine, but it still smokes a lot when i give it gas, burns oil, and the plug is always oily. if it's just the rings that need replacement, i have no problem doing them, but if it needs a new oversize piston, a rebore, and rings, i'll probably just get one of the big bore kits for it. also, the engine is making a weird, machine type noise, and i tried tightening the cam chain, but when i try the adjuster on the cylinder head, it gets hard to turn, then the engine slows down, is there another way to adjust it, or do i need a new cam chain? the lower adjuster didn't do anything.

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Make sure it isn't over filled with oil.

If it has a relatively new top end, I wouldn't expect that you should need a piston or rings.

XR100's can be a little noisy. You can adjust the valves and cam chain. If the piston is really worn, it can get noisy. I had one get noisy and found that the both ends of the connecting rod were shot. You don't want that problem.

- Brad

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how would i look at the cam chain tunnel? if i take off the head cover, will i need to replace any gaskets? and also, the guy i bought it from said the top end was all new, except for the piston and rings. if it's smoking bad, do you think it'll need to be bored over?

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Could just be the exhaust valve seal needs replaced, but you can get a BBR kit for pretty cheap and do everything at once. You can't tell without looking at it whether or not you need piston/rings, rings, bore, hone, or whatever. So it's best just to spend a half a day on it taking it apart and try to assess the situation.

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