How to adjust cam Chain - Edited with more questions - Yamaha ATV Forum
 
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post #1 of 15 Old 03-31-2005, 09:19 PM Thread Starter
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How to adjust cam Chain - Edited with more questions

How do you adjust the cam chain????

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post #2 of 15 Old 03-31-2005, 09:53 PM
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Theres an auto tensioner to take the slack out. When its old enough so the marks dont lign up worth a darn its time to get a new chain.

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post #3 of 15 Old 03-31-2005, 10:39 PM
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Yep, spoke to my engine guy today about the SAME thing. he said it should be very close with timing (if you have it as close as you can get by jumping the chain around so it lines up), but if its too far off(should be VERY close), ya need a new cam chain. I think next year im gonna get a DID cam chain for the hell of it.

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post #4 of 15 Old 03-31-2005, 11:05 PM Thread Starter
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we pulled the cover off and the chain is so loose that it is slappin against the side. This is what is making the clunking. Is this normal or is this to loose?

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post #5 of 15 Old 03-31-2005, 11:08 PM
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Too loose get a new cam chain, the cam chain adjuster adjusts automatically, so apprantly yours is stretched beyond the limits.

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post #6 of 15 Old 03-31-2005, 11:32 PM Thread Starter
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how much for a new one. Just oem, nothing special.

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post #7 of 15 Old 04-01-2005, 01:21 PM
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you can get oem type ones outta magazines but if i were you i would just get a did, theyre only like 10 or 20 bucks more and then you know you have brand name that will prolly last a long ass time.

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post #8 of 15 Old 04-01-2005, 02:29 PM
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www.mrcycles.com I got a chain and a bunch of other stuff for a Lodiak 400 I just rebuilt the top end on. The chain an dmost of the otherr parts are identt Warror arts nthe chain was only like $32, I think. A DID is something like 60-odd. Most parts places, including the dealer, want like $60 for the stocker.

Get yourself a flywheel puller, or find someone that has one, 'cuz it'll have to come off to change the chain. If you pull the flywheel first, you may be able to get the chain changed without even taking the cam gear off. But I won't swear to it.

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post #9 of 15 Old 04-01-2005, 03:13 PM Thread Starter
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how much work is involved in replacing one?

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post #10 of 15 Old 04-01-2005, 03:52 PM
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First take out your cam chain tensioner and see if its fully extended like it should be. If you cant tell how it was when it was together just try putting it back in without retracting it. Shoulnt be able to go in.

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post #11 of 15 Old 04-01-2005, 05:43 PM Thread Starter
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Is it possible for the cam chain to slip, causing the timing to be off. Would this cause the the piston to not stay at TDC while turning the flywheel. If this wouldn't cause it then what would.

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post #12 of 15 Old 04-01-2005, 06:49 PM Thread Starter
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I just went out and looked and the cam chain is 1/4 turn out. When it should be at TDC, it is 1/4 turn to the left. How do i get this back to its regular position? Would this cause my valves to be out, and compression to be at almost 0?

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post #13 of 15 Old 04-01-2005, 07:01 PM
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If you've checked, and the flywheel sight shows a T and the mark on the cam gear isn't lining up with the mark on the cyl head (all this while the tensioner is installed) then you might have problems with compression. Depending which way the cam is rotated either the exhaust or intake valve will be slightly open and the timing will be off.
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post #14 of 15 Old 04-01-2005, 07:03 PM
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You are seeing what is pollitely called 'jumped time'. In most cases, this is caused by an overstretched cam chain that cannot keep proper tension. Take the center bolt out of the tensioner and then take the tensioner out of the head. I will almost guarantee that the tensioner plunger will be all the way out, indicating a stretched chain.

The short answer to your question is yes. The cam gear being a 1/4 turn out will cause the valves to open and close in improper time to the piston arriving at TDC and will cause almost 0 lbs. compression. As the piston reaches TDC, the time of highest compression, the exhaust (most probably) opens, allowing all that mixture to exit the cylinder before the piston actually arrives at TDC, when the plug would fire.

First thing to do...check the tensioner. When you find it's all the way out, order a cam chain and find someone with a flywheel puller. It's really not too hard to change, just takes some time.

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post #15 of 15 Old 04-02-2005, 06:08 AM Thread Starter
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Ya the tensioner is wayout, so i guess i will have to order a new one.

2003 Yamaha Raptor - MSR Handlebars, Motion Pro Twist Kit, Baffles Removed, DG Alloy Nerfs

1987 Yamaha Warrior- Baffles Removed, 25's on the rear. SOLD!!!!!.......Finally
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