Maintenance & Technical > KX500 Original
HELP!! 1994 KX500 motor noises
Polar-Bus:
A common issue with the "big 5" is the exhaust head pipe vibrating against the inside cylinder. I run a double exhaust gasket. And make sure the pipe o rings are in good condition. If not the vibration causes the exhaust flange to hammer the crap out of the inside of the cylinder.
ToomanyKaws:
I have a wiseco in my one 500. And my other 500 is still the OEM piston. Both bikes don't like 91 octane out here. I mix in 50% 100 and both engines are quiet. I run straight 100 and they both haul ass. People say oh that much octane is a waste. Not needed. Sure seems to make a difference. And I tried to jet to alleviate any pinging on 91 to no avail. Had the needle all over the place.
My main point is on 91, you would think either engine was going to grenade on decel and at various rpm and load ranges. And yes the 500 has its own noises compared to about any other two stroke I have had. Amazing what some octane does to make an engine happy.
kwakman:
next time you,ve got the stator cover off, try and pull the flywheel up and down.if you get any discernable play, your bearings need attention.i would advise any new/prospective 5 owner to check this when buying, or in your case,as soon as its viable. this is unlikely to cause the noises you speak of, but theres a lot of inertia and other forces which will make an expensive mess of your new baby.protect your investment and check it before winding her out...
awak100:
Race gas? Did you up the compression quite a bit? I see guys running race gas all the time at hill climbs. Dam bikes spit sputer fart. Lets see up compression up up gas, stock compression stock gas 92 Save alot of money that way
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