Motor noise, Help me !
Posted June 26, 2001 - 12:15 AM
It is all time, but idling is more easy to hear it.... Please HELP ME!!.
WR400´99 Stock, 12000km (7200mile) so so. I don´t race it, I tour it too much.
Posted June 26, 2001 - 01:07 AM
'99 WZ/YR (you choose!) with ALL YZ mods, de-octopused, DSP Doug Henry airbox w/ velocity stack, FMF PowerBomb header, Stroker SX-1 silencer, SS front brake line, forked over by Pro-Action (and then fixed by me), OEM YZ tank, IMS YZ seat, gray wire severed, carb mods by Jim Dean, Andy in OZ, & Sir "Taffy" from Jolly Old England, AMA, NESC, and I use MOBIL 1 Oil, with ZERO problems.
Posted June 26, 2001 - 08:48 AM
did you recently adjust the valves? I installed the cams incorrectly in my bike - 1 tooth off - and it was the cause of the noise in my bike.
Posted June 26, 2001 - 01:26 PM
"primary gear noise", I don´t think, the noise is all time, included when it isn´t on first gear. ("primary gear noise", do you refer to first gear?).
And the cam are ok, the noise is before the change of the timing chain.
Posted June 26, 2001 - 01:52 PM
You can search on my name and come up with additional info.
Primary drive gear & counter balancer gear are on the right side of the engine, between the clutch basket & water pump.
Hope this helps,
[This message has been edited by Brian Meadows (edited 06-26-2001).]
Posted June 26, 2001 - 02:09 PM
I live in Argentina and my english is too bad... Do you understand me without problem?
Posted June 26, 2001 - 03:31 PM
Originally posted by Elian:
("primary gear noise", do you refer to first gear?).
I think they are talking about the primary drive gear on the crank that drives the clutch. But it is the gear behind this one that drives the counter balancer, it is secured to the crank with a straight key. On some ’00 YZ/WR bikes this gear wears a groove in the key due to the to and fro resistance of the counter balancer.
Just about everybody suspects some kind of valve train problem when they hear the noise this makes.
Here are some old posts on the YZ side about this problem:
Primary Gear Noise and Solution
Can’t find any reason for that noise
Hope this helps.
Posted June 27, 2001 - 12:35 AM
Posted June 27, 2001 - 07:35 AM
Posted July 03, 2001 - 07:32 PM
Later, a turn the crankshaft left and right, and I feel a tiny “hit” (tic-tic-tic). Then I decide to remove the cam and T-chain, turn again the crankshaft (left-right-l...-r...-l...-r...) and the hit still is there (then I said the problem is in: the piston pin – rod – bearing – pin crank). Remove the cylinder head, after it the cylinder and piston together (to avoid replace the rings). I FOUND A BIT OF FREEPLAY IN THE PISTON PIN WITH THE ROD, AND A “VERY TINY BIT” FREEPLAY IN SOME POSITIONS IN THE CRANK PIN (moving up-down).
1- Is the piston pin freeplay normaly? What is its limit?
2- Is the crank pin freeplay normaly? What is its limit?
Please helpe me, I´ll appreciate very, very much!. Thank you.
Posted July 04, 2001 - 09:45 PM
Posted July 04, 2001 - 04:01 PM
Ther manual said:
SMALL END FREE PLAY = 0.4 ~ 1 mm. (0.016~0.039in).
Is it the free play side to side between the pin and the piston?
Posted July 04, 2001 - 06:36 PM
Pretend it's flat and give it the gas.
Posted July 04, 2001 - 07:41 PM
This free play is OK?.
Posted July 05, 2001 - 04:49 PM
Posted March 25, 2011 - 12:27 PM