Posted May 16, 2001 - 03:34 AM
Posted May 16, 2001 - 03:56 AM
You can always tear it down to check main bearing play and cylinder/piston wear. If left unchecked, you will always wonder what the damage really is, and if you will be stranded in the middle of nowhere due to main bearing seizure. Grim, but true.
'99 WZ 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, carb mods by Jim Dean, Andy in OZ, & Sir "Taffy" from Jolly Old England, AMA, NESC.
Posted May 16, 2001 - 04:03 AM
Appearence wise my 01 426 looks like crap, but mechanically it's a.o.k.
Posted May 16, 2001 - 02:19 PM
Something just occurred to me. The 1700cc oil capacity of these machines helps to remove internal heat. The frame tank reservoir capacity helps to dissipate heat as the oil circulates. Possibly, as you lost oil, the heat increased quickly and the tolerances may have increased to the point that things got tight. If that happened, then friction and wear comes into the equation. I can certainly understand your concern. Good luck.
[This message has been edited by Boit (edited 05-16-2001).]
Posted May 16, 2001 - 06:23 PM
The rod bearing and then the cams probably take oil starvation the hardest judging by the way they are oiled, the other bearings in the motor aren’t really pressure oiled, and you had at least some oil in your cases.
I doubt you’d be finding debris in your filter regardless, if the pump(s) could deliver it there then you are obviously circulating oil, so whatever evidence of engine damage that exists is either in your cases and remaining oil, or out there in the woods. You may consider flushing the cases via the drain plug into a drain pan; just remove your right cover and lay the bike on that side and see if anything scary comes out. If you still have the remaining oil run a magnet through it, and check your rotor, metal will stick to the magnetized inside portion.
If the motor gets hot enough it can stall due to the extra friction, I’ve done this to my YZ before when I lost all my coolant and long term consequences were nil. I’m lazy and reckless so I didn’t pull anything apart until much later to re-ring it and everything looked fine. But losing oil pressure would make me a bit more nervous. FYI you can check the rod bearing and valve train without splitting the cases or yanking the motor.
Hope this helps.
[This message has been edited by Hick (edited 05-16-2001).]
Posted May 17, 2001 - 05:09 AM
Posted May 17, 2001 - 03:36 PM
Posted May 18, 2001 - 02:00 AM
i think you've either damaged this or you've became a bit nervy when riding it & you aren't giving it enough revs.
i think you're going to gain in confidence & it'll all be OK.