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Timing chain and guide replacement

This is a discussion on Timing chain and guide replacement within the Yamaha YFM350 Raptor/Warrior ('87-Present) forums, part of the Performance /Technical category; Might be a dumb question, and I am sure I will find out when I try to do it, but I will ask anyways...Do you ...


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Old 10-29-2010, 07:17 AM   #1
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Default Timing chain and guide replacement

Might be a dumb question, and I am sure I will find out when I try to do it, but I will ask anyways...Do you need to pull the head and cylinder when changing the timing chain and guides? It looks as though the chain will come out fine, but I am not sure if the tensioners will come out without taking the top of the engine apart. Any insight is appreciated!
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Old 10-29-2010, 09:32 AM   #2
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if you are simply swapping chains, you will need to remove the tensioner, the cam gear, the rotor/flywheel. put the engine on it's timing marks before taking any thing down. it may also be a good idea to disconnect the battery. to replace the guides, you will have to remove the head. are your guides really bad? they tend to last longer than the motor from what i have seen on almost every engine.
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Old 10-29-2010, 12:30 PM   #3
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^what he said
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Old 10-29-2010, 06:49 PM   #4
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Thanks for the replies! Its hard to tell if the guides are bad or not. I looked down into the engine with a scope, and from what I can see, they look a little worn but its hard to get a good view with the chain in the way. I am going to pull the chain out so I can get a closer look at the guides. Chain is definately bad, as my tensioner is about 1 "click" away from being fully extended. I hate to have to tear the engine down, due to the fact that it seems to run strong, and has 125 psi compression. Has some serious top end chatter after it warms up, even after checking the valve lash.
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Old 10-30-2010, 08:44 AM   #5
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when you go to replace the chain, have a good micrometer and service manual handy. i know my lobes have been being ate down, but i have no abnormal noise. you will want to measure the pivot pins for the rockers (at the rocker) and the cam ends as well as the cam end bearings. it has been awhile since i've been into mine, but i'm thinking you will need plastiguage.
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Old 10-30-2010, 04:22 PM   #6
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Parts are due to come in on Monday. I will check everything over and post the results.
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