Quote:
Originally posted by motomanmike
Ok guys, many of you in your posts have said its grass on the screen. Its clutch fibers, small pieces of the clutch discs that sheer off. Also you are going to have the "gunk" you had after assembly. Its lint off of all the shop rags you use when wiping everything down before assembly. Whatever you do don't remove this screen. It is to protect the oil pump, and why would you want to? There are three parts of the yfz motor that screen oil, one is the screen in question in the tank, the second is in the botttom of the cases and seldomly gets anything on it, and of course the third is the oil filter. No matter how much you change your oil, you will have some metal filings in the engine. They wear during use, its that simple. Change your oil everytime you have a race or long practice and it will significantly extend engine life. Usually the first part affected by neglect is the cylinder heads and they aren't cheap to replace on these quads.
Quote:
Originally posted by Piker450
not everyone should have to worry about this, dude you must not break your stuff in right because that is not right, i had an 05 ran in a bunch of xc races checked that screen and nothing like that came out, just remember break in easy they will last longer, and change oil and filter after every race, or every other ride, oh ya dont use quaker state, bad stuff
As far as breaking in my bike right. I got 2 1/2 years off of my motor when it was stock and almost 500hrs before the piston finally cracked. The gunk you see (As stated in my post) was after a rebuild. Loctite and sealant in between the cases. And as far as breaking it in easy (LOL). I've seen guys pamper their bikes for weeks and have the motor go in less than a year. I'm currently almost a year on a race motor with a breakin of about 20mins of heat cycling and then riding it like I stole it ;)