Question about 2005 Honda CRF 250 X

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Bike is a 2005crf250x. Need timing chain slack.

I didn't have enough slack in the timing chain to get it over the cam gear. The chain tensioner is not the problem. I have removed the head and jug. The chain feels like it may be caught up on something in the crank. Could that be possible?

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  • Anonymous Mar 23, 2014

    2001 has bike got Manuel timing chain tension adjustment


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Lift the chain with one finger then turn the crankshaft several full turns by hand. Inspect the full length of the chain during rotation. Any obvious damage? Does the chain revolve smoothly around your finger? If all seems okay then the problem is probably not in the lower end. Some chains are continuous and do not have a master link. Some do have a master link. If you have a master link then separate the chain by removing the link then place both ends of the chain onto the cam sprocket and reconnect the link. If you have a continuous chain I would need to see first hand what is going on. In any event, be certain the timing marks on the flywheel and overhead cam are correctly lined up during installation.

Posted on Mar 11, 2009

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1 Answer

Need know how set timing on Yamaha v-star classic 2002

Ensure the line on the timing rotor with a T next to it is aligned with the notch in the timing window

Starting with the rear cylinder, ensure the camshaft locating dowel is aligned with the mark on the cylinder head at about 1 o'clock
Engage cam sprocket with cam chain so it will line up with the dowel & fit onto camshaft

The mark on the sprocket should now also line up with the other marks. Turn the cam sprocket clockwise to remove all slack in the chain, push against the runner through the cam chain tensioner hole to take up slack, this re-aligns all the marks

Bolt cam sprocket to shaft & fit tensioner. Turn crankshaft until the other line on the rotor aligns with the notch in the timing window
Repeat the above process for the front cylinder

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How do I line up my marks on cam shaft and flywheel to set timing

Hi mate didn't get any info on what bike you are timing but this procedure is simular for most and is specific for WR YZ 250 426 and 450

set piston to TDC (top dead centre) this can be done by spinning the fly around until you can see the (i) mark stamped on the flywheel line up with the marks on the inspection plug hole (engine case) good idea to probe the cylinder through the spark plug hole to confirm the flywheel mark is correct (I have seen several 426) where the TDC mark does not give accurate TDC on piston so worth second guessing this process.

once TDC is set do not allow piston to move from this point on - starting with the exhaust cam with no slack on the cam chain the dot stamped on the cam sprocket should align with the face of head with the cam lobes pointing outward roughly 45 degrees towards the front wheel when this in place

you do the same with intake cam except the cam lobe will face opposite direction outward and the should be a dot aligning to the head

double check before you go further that when you put your finger in the chain tension hole and you tension the cam chain that when all slack is taken from the cam chain that your dots on both cams align with head face and that you still have piston at TDC if all checks out then this is timed set correct so torque all the cam caps back up install chain tensioner and the recheck all fly wheel marks are in correct position and piston is at TDC and the dot on each cam sprocket aligns to the head if it doesn't then re do the process

don't be surprised if this takes a few attempts as it takes the best of us usually at least two attempts to get all marks to align correctly thats why best to check and double check before you bolt it all down then you can adjust just by lifting one cam out and moving one tooth either direction

You have little room to play with and when you start putting chain on the cam sprockets you will find very little extra chain length to play with you may need to wiggle tug and pull both cams together to get them back in each time but go slow and gentle they do go in they just need to be encouraged

I happy to elaborate on any point if you need - good luck

Regards Jamie

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If you've never done this before and you're not familiar with your bike I'd strongly suggest getting a shop to do it. It's hard enough to do even if you do have cam sprocket markings . . . .

However if you want to do it yourself then you need to do a few things before you start. First you need to be absolutely certain where top dead centre is. Usually you can get this from the crank rotor markings, or do it the old fashioned way with a long bolt down the spark plug hole and wind the piston until it just touches the bolt from both directions. Then mark the spot half way between which will be TDC.

Now you know TDC, you also need to ensure that the cams are on TDC for the compression stroke of cylinder 1. When the engine is on compression stroke, the cam lobes will be pointing slightly away from each other and will not be near the bucket/cam follower. Once you have the crank exactly in the right position you need to make your own cam sprocket markings so that you can put the cams back in exactly as you found them. ALWAYS crank the motor forwards while doing this or you can put slack in to the chain which will give you a false result and might result in you getting your cam timing wrong.

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