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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The pistons, valves and cylinder walls typically take a beating when the timing belt breaks. If yours didn't, I'm amazed.

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.
Make certain that the crankshaft and the camshaft(s) are all at #1 TDC, if there are holes in the sprocket(s), push an appropriately sized drill bit through the hole, into the corresponding hole in the head to hold the camshaft timing, then replace the belt, making certain that any idler pulleys or tension adjuster pulleys are out of the way. After you've put the new belt on, Put the idler pulleys and tension adjusters back into their appropriate place then remove whatever you used to hold the pulleys in place.
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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2003 crf 4 stroke. has compression. no leaks. engine sparking. fuel system fine, plug wet. engine wont start?

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).
If you have double checked all the basics and are sure we have fuel,compression, and ignition and it still wont start then check your flywheel key and valve timing.

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if you went by the manuals timing mark instructions you should be fine but i'd bet its still not in time. the lines on the cam should line up parrallel with the head casting, most times it looks like they are but its still one tooth off, i usuall put tensions the chain with my finger to see how parralell they are.. make sure the motor is in top dead center compression also. the manual is what shows your at tdcc.

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Any chance the valve spring has collapsed? Cam shaft thrust washers missing? Cam shaft bearing gone bad?
abe5193.gif b3c3550.gif Please rate this solution. Thanks!

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