Question about 2002 Honda CRF 450 R

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Valve Timing and Head Tension

I am replacing the the valves on my Honda CRF 450 2002 and need to know the Valve Timng and Head Tensions?

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Line the second mark on the flywheel up in the hole on the left cover that is top dead center, that tensioner i believe you have to prewind to bring it back take the bolt out and use a small screw driver and wind it back in and leave it in there untill you put the cam back in and bolt it down. make sure you use caution when removing the bollt from the tensioner it is spring loaded. the cam sprocket has lines or dots they will need to line those up with the gasket surface make sure there is no press on the valves that will be top dead center comp

Posted on Dec 24, 2008

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Posted on Jan 02, 2017

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But you can TRY this:
For most OHV engines with a timing belt there is usually a hole in the camshaft sprocket that can align with a hole in the head. If there are two camshafts, each sprocket typically has the same arrangement. Look closely, if there is no hole, there will be a mark of some kind to indicate #1 Top Dead Center.
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Most of the time a valve will "kiss" a piston when the timing belt breaks. That causes immediate and fatal damage to the engine requiring (at minimum) a complete engine rebuild. Sometimes valve seats, pistons, cylinder walls and other components are destroyed when the piston and valve collide.

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Gotta start with the simple things...
How do you know the compression is fine? Since you did not give a compression reading I do not know what method you used to test the compression.
How do you know the fuel system is fine? The plug is wet with what? Could it be water?
How do you know the spark is fine? Have you used a spark tester? Or did yuo use the spark plug on the side of the head? Did you know a bad spark plug can still spark under regular condition but wont spark under compression?

You left out valve timing- its a 4-stroke.
First put in a new plug. Then see if it hits on a prime ( see my tip on diagnosing a small engine).
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abe5193.gif b3c3550.gif Please rate this solution. Thanks!

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