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Dirt Bike Mods & Maintenance
XR400R Bent valves
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[QUOTE="Ol'89r, post: 1323836, member: 17212"] Good for you. :cool: You will want to use your inch pound torque wrench for the engine parts. Get yourself an impact driver screwdriver. Harbor freight sells one for about $10.00. This will keep you from stripping the heads of your screws. When you start to take the engine apart, remove the top rocker cover and take note of the position of your camshaft in relation to your crankshaft. Take a small screwdriver and put it in the sparkplug hole and rotate the engine over until the piston comes up to top dead center. (TDC). The lobes on the camshaft should be pointing down towards the piston. If they are pointing up, rotate the engine one more revolution until they are both pointing down. Take note of the mark on the crankshaft through the inspection cover. The crank mark should line up with the mark on the case. (Refer to your manual for this.) With the engine on TDC, look at the chain sprocket on the camshaft. Take note of how the marks on the camchain sprocket line up with the head surface. This will help you get an idea of how to line everything up when you reassemble the engine. When you unbolt the camchain sprocket, be sure not to let it drop down into the cases. Attach a piece of wire to the cam chain so you can retrieve it from the cases when you reinstall the camshaft sprocket. It's ok to use this thread to ask questions. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
XR400R Bent valves
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