Posted October 01, 2006 - 11:42 AM
Hopin' yall can help with a concern I have with my '03 WR450.
The engine has quite a loud knocking sound which seems to come from the upper part of the engine.
It's there all the time, ie when hot, cold, idling. If I lean over the handlebars, I can even hear it while riding at low speeds.
After making a few local enquiries, I'm told that these engines are quite noisy and this was quite normal.
I've checked the valve clearances..........
Examined the cam lobes and followers.....
Checked the timing chain and tensioner...
Changed the oil using correct spec.........
I can't work out for the life of me, where this noise comes from.
I'm pulling the barrel off tomorrow to check the piston.
To all you WR owners out there, are these engines quite knocky or is it just mine.
Other than the noise, the bike's fine.
Any help much appreciated,
Posted October 01, 2006 - 01:57 PM
How many kms have you got on yours? im wondering if you got piston slap?
Posted October 01, 2006 - 03:20 PM
thin engine walls to save wight!
Posted October 01, 2006 - 07:52 PM
i went to dealers and asked as well they told me it sounded normal
rode several of buddys o3's as well same noise
iv been riding mine for about a year now and still alive
Posted October 02, 2006 - 01:47 AM
Posted October 02, 2006 - 04:25 AM
My bike's done around 6-7000 km I guess.
I've removed the cylinder and piston now. The cylinder is in perfect condition but the piston is confusing me.
If I measure the piston near the bottom of the skirt, its on spec at 95.00mm......
but if I measure it near the top, it appears tapered, and measures 94.60mm.
Is this wear or are they meant to be tapered?
If it is wear, maybe I am hearing piston slap.
If the piston is normal.......
Your thoughts guys..........