pace said:With the sparkplug in place, does it 'feel' like the motor has decent compression when you kick it over?
With only 35psi, there should be little or no resistance to kicking the bike over..
-pace
MikeT said:35psi? Man that is low. Something is wrong. I'd pull off the top end and take a look. You might have a seized piston ring. The bike should actually be running rich since you went up in elevation and the day was hot.
Better be safe than sorry. Pull the top end and have a good look at what's inside.
The ring (if it is seized in there) isn't really "stuck" where oil or a cleaning fluid would help. The ring is actually held in by melted piston material. When you take it out you should see a rub mark on the piston right over the ring holding it in.dante said:Is their a way to unstick the ring? Or does it just need to be replaced... Someone here at work said to try putting a little oil on top of the piston to possiably un stick the ring... ...
MikeT said:The ring (if it is seized in there) isn't really "stuck" where oil or a cleaning fluid would help. The ring is actually held in by melted piston material. When you take it out you should see a rub mark on the piston right over the ring holding it in.
That said, without seeing your bike this is my best guess from nearly 20+ years of experience with 2-strokes. I might be wrong but a through investigation of the your end is definately in order. I can't think of anything else that would make it do that. If it is seized in there, you will need to get a new piston, ring, and gaskets. That usually will cost you anywhere from $65-$100.
Changing the top end (piston and ring) is really not hard. If you lived near Charlotte, NC I'd do the work for you for free. :)
dante said:My brother told me never to re-ring an old/used piston but people here seem to do that regularly between new pistons/top ends... Any thoughts on re-ringing used piston? Or is that generally a bad idea...
va_yzrider said:People here do this on pistons that they know the condition of. You don't know what condition that piston is in b/c it came from someone else. You should replace both and start fresh.
Also, what are the odds that the piston siezed at the exact moment that you crashed? Did you pin the throttle when you crashed?
Further, get a manual for your bike ASAP! Also, if you can work on your street bike as you mention, a top end shouldn't be difficult for you. You will be a bit nervous the first time, but should be able to complete the job successfully.
kcsteck said:when doing comp check you have to hold throttle wide open at same time you are kicking it over or will get wrong info. come on guys we forget?
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