Question about 2001 Honda XR 250 R

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Cam chain xr 250 honda

Put in new chain but seem to be out of sinc with valves

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  • Anonymous Mar 15, 2014

    what are the valve clearances on a 1995 xr 250


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Check the timing marks on the crank and cam make sure they are alligned at tdc

Posted on Jan 13, 2009

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2 Answers

I have a 2000 xr 80,we put new piston and rings in.Timing marks were lined up but is there a way to fine tune timing?

The valve timing is a static setting. As a rule it will either work or not. The only adjustment is usually the ignition timing.

May 02, 2011 | 2000 Honda XR 250 R

1 Answer

Xr 350 timing chain slop makes noise can i adjust it

Both the 1985 honda xr250r and xr350 look loke they have self adjusting cam chain tensioners. You may have a broken tensioner or tensioner guide. With the age of the bike you may need a new cam chain. There is nothing to adjust so you need to just figure out if the chain is stretched , if a guide is broken, or if the tensioning mechanism is malfunctioning.

Oct 01, 2010 | 1985 Honda XR 250 R

2 Answers

My '85 xl 250 r seized up on me one day, looking for advice

your not going to know until it is pulled down and inspected.
You say it wouldnt start then siezed. if it wasnt running when it siezed it could be a cam chain , or a problem with the kick start mechanism.
pull the rocker cover off (it will come off with the engine in the frame) and have a look.
Pull the left engine cover off and see if you can turn the flywheel(spark plug out).
This should give a bit of an indication if there is major internal problems.
The 85 had a real problem with cracks in the head just near the spark plug thread, but this wouldnt be the cause of a siezure.

Jun 28, 2010 | 1985 Honda XR 250 R

1 Answer

How do I adjust the timing on my 250

the ignition timing is electronic, you dont adjust it.
if you mean valve timing.. if it is out of time then you probably need a cam chain and tensioner,

May 01, 2010 | 1985 Honda XR 250 R

1 Answer

How do you adjust the timing chain?

you can't adj. it the cam chain adj. is spring loaded. if your chain is lose there would be three things i would replace, the cam chain. the followers and the adj.
Given the age it wouldn't hurt please it will give a chance to look over the vavle trian.
C.C. Motorsports

Mar 19, 2010 | 1987 Honda XR 250 R

1 Answer

Hello iv changed the piston on my kids honda xr 50 now it wont kick over i can move the piston through the head pulling the small chain in the cylinder head about 2 turns of the coge the opposite way to...

It sounds like you have not set the cam chain timing. If the cam is not timed to the piston position, the piston can come up and hit an open valve. If you put the engine together and kicked it over so the kick jammed then the piston has hit an open valve and chances are very strong that the valve is now bent. Bummer... If bent badly enough the valve guide may be cracked as well. Double bummer... I would pull the head off and do a visual inspection of the valves. Do they LOOK fully closed? Can you see a strike mark on the top of the piston? If all looks good, I would put the head back on then set the cam timing then turn the flywheel over by hand a full four revolutions. If it doesnt bind up you should gently push the kick lever to turn the engine over a few times. Okay, the piston doesn't seem to be hittinng a valve. Now do a compression check. You want to have 130 to 160 psi. If you do, the valves are okay. Get back to me by posting a comment if you don't know how to set the cam timing. The following diagram may be self explanitory. Please rate my answer. Thanks.


Feb 21, 2010 | 2002 Honda XR 200

1 Answer

How do i remove the cam chain off the sprocket? undo the 2 screws out the sprocket and slide the sprocket across and down or?

Remove the spark plug then put the piston at Top Dead Center compression. Look at the position of the timing marks on one side of the cam, parallel with the gasket surface. Remove the cam as you described.

Sep 30, 2009 | 2001 Honda XR 250 R

3 Answers

04 crf 250r.... the head has a chattering noise when running

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!

Jun 22, 2009 | 2005 Honda CRF 250 R

1 Answer

Engine noise

sounds like it could be 2 things. the valve tappets, meaning valves need adjusting and or loose cam chain which may need adjusting.

May 27, 2009 | 2004 Honda XR 125 L

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