Timing issues? - Honda Foreman Forums : Rubicon, Rincon, Rancher and Recon Forum
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post #1 of 29 (permalink) Old 09-15-2010, 10:44 PM Thread Starter
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Timing issues?

Working on a 2002 Honda Rancher TRX 450.
Am new to the site and have a repair shop and need help. Customer brought machine to me with front cover taken off by another shop and was told that timing chain was broke. Looked at all components and saw nothing broke-loose maybe but not broke! Removed the valve cover and all pushrods, rocker arms, and valves moving freely. Put all components back on the front of motor, adjust valves, and try to start. Compression coming back out of carb with gas. Remove the head and appears intake valve is not seating. Remove the valve and replace b/c it is dished out, exhaust valve looks good. Mic the cylinder and it is worn out as well. Get cylinder honed .025 oversize and install new piston and rings. Put all back together and try to start again. Acts like the timing is off as it will try to start but sounds like very retarted timeing like sprocket jumped a gear. Has anyone ever heard of this? Any info would be appreciated! Can not see any timing marks on the crank b/c of the clutch pack is in the way. Sorry to be long winded but wanted to give the whole story.
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post #2 of 29 (permalink) Old 09-15-2010, 10:56 PM
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You need a service manual so you can see if the mechanical timing is out of wack. Im sure someone will chime in soon who is willing to share.
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post #3 of 29 (permalink) Old 09-15-2010, 11:02 PM Thread Starter
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Yeah that would be a huge help! Can't remember now if I saw timing marks on the cam gear or not, but that has to be some way to line it up. Am going to remove the front cover in the morning and look again.
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post #4 of 29 (permalink) Old 09-15-2010, 11:15 PM
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Toodeep is usually the man on these things. Im sure this thread will eventually catch his attention.
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post #5 of 29 (permalink) Old 09-15-2010, 11:16 PM
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I uploaded one to a website that I am not using rite now.
It is located at:
http://www.atvpartsdirect.com/354867...air_Manual.pdf
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post #6 of 29 (permalink) Old 09-15-2010, 11:17 PM
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Take out the timing hole plug and line up the "T" mark on the flywheel with the notch in the side of the hole. That will put your piston on TDC. The timing plug hole is located on the right side of the engine, near the pull rope. It will be about the size of a quarter and I think it takes a 6mm allen wrench or allen socket to remove it.

For the cam, make sure the lobes on the cam are facing down and make sure the punch mark on the cam gear is lined up with the index mark on the crankcase. The index mark on the crankcase is right above the cam gear.
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post #7 of 29 (permalink) Old 09-16-2010, 06:42 AM
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to the forum..

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post #8 of 29 (permalink) Old 09-16-2010, 09:01 AM Thread Starter
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Thank you

Thanks for the information and the welcome!
Is it normal for one to get out of time like this? How can it? Does this mean that the guides or tensioner is not working correctly? What is the adjuster for on the front of the motor that says increase or decrease? Have to do with governor or what?
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post #9 of 29 (permalink) Old 09-16-2010, 09:37 AM
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Welcome to the forum. Are you working on a 350 Rancher or 450 Foreman? If it's the 450 the cam chain adjuster could be bad (fully retracted) and that will let it jump time.

The adjuster on the front crankcase cover is for the clutch adjustment.



If it's a 450.

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post #10 of 29 (permalink) Old 09-16-2010, 12:57 PM Thread Starter
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Still working on it!

Am working on 2002 Honda TRX450FE
Took the front cover off this morning and removed the timing plug and put engine at TDC(T lined up in sight window). Looked at cam alignment and timing mark on block is at 12 and cam gear is at 10-so definitely out of time. Now, the chain is loose and the tensioner is not resting on the chain guide-don't now if this is right or wrong. Is there anything esle that I need to know about removing that balancer or whatever is on the front of the crankshaft? Or do I not need to remove it?
Thanks again-you guys are awesome at this!
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