Posted May 11, 2011 - 03:41 PM
Posted May 11, 2011 - 04:52 PM
Posted May 12, 2011 - 08:41 PM
Posted May 13, 2011 - 11:38 AM
The procedure to adjust the chain is the same for all WR450F's. The slack dimension tolerance may be different between model years however. Check your owner's manual for the correct slack tolerance.
I'm sure that you are familiar with the procedure to adjust chain tension. However, just to ensure that one critical point is not overlooked, I will remind you that the slack tolerance dimension is NOT the difference between the measurement shown in the illustration contained in the Owners' Manual while the chain is at rest and the measurement of the chain while the chain is under tension. In the old days, when everyone rode Husqvarnas and CZ's, that was the way chain tension was measured. If you calculate the chain tension using this method, your chain will be too loose.
The correct way to measure the tension on your WR is to record the distance from the top of the bolt in the chaffing pad which is located on the top of the swing arm up to the BOTTOM of the chain. This dimension should be (for the 2008 WR) 48 - 58 mm or 1.9 - 2.3 in. Look closely at the illustration in the Owners' Manual to see my point.
I adjust my chain this way and I do not have chain slap and I do not have marks on the inside of the subframe or main frame near the countershaft sprocket.
Posted May 14, 2011 - 02:47 AM
Posted May 14, 2011 - 06:11 PM
Chian slap = you ride 2 slow.
Lol,your prob. right,thanks boys i'll try some things
Posted May 16, 2011 - 03:56 AM
Posted May 17, 2011 - 01:27 PM
Posted May 17, 2011 - 05:28 PM
Posted May 29, 2011 - 09:50 PM
Posted May 30, 2011 - 09:40 AM
I just bought a used 05 wr450 and took it on a maiden voyage today. The sprockets and the chain look like they are in realatively good shape. The chain is set right. I am getting a lot of noise from the chain. Happens most when I am decelerating down hill and off of the gas and I hit the back brakes ( both with the clutch pulled and released). also a little bit in the beggining of acceleration. lot of slapping going on, I've only heard this kind of noise on bikes that had way to loose chains or worn out sprockets. DUMBFOUNDED
Even though your chain might appear to be tensioned correctly, if it has uneven wear - tight in some spots, loose in others - you are going to get chain slap. Definitely do the "silicone under the buffer pad" mod as that helps muffle the slapping sound, but IMHO, a new set of chain/sprockets is a good way to start your "new" ownership experience with the bike. It will also be a data point for future troubleshooting of strange noises.
Posted May 31, 2011 - 04:25 PM
This is kinda what I was thinking. If you're on the gas, there is tension in the top of the chain and slack on the bottom. Vice versa if you're coasting, braking, decellerating. The WR has lots of engine braking and it's easy to put yourself into that situation. Not me, of course
Chian slap = you ride 2 slow.