Two Stroke Motocross

Two Stroke Motocross Forum => Technical => Topic started by: oldyz100 on August 08, 2012, 12:07:00 AM

Title: 83 yz 100
Post by: oldyz100 on August 08, 2012, 12:07:00 AM

i picked up a 83 yz 100 was told it just had a top end rebuild.  I was riding around a sand pit and it started to slowly lose power eventually just bogged out. im thinking maybe need a new piston or rod etc. any ideas would be greatly appreiciated. 

Title: 83 yz 100
Post by: SachsGS on August 08, 2012, 05:25:10 AM

Check the compression.

Title: 83 yz 100
Post by: riffraff on August 08, 2012, 05:53:51 AM

Quote from: SachsGS on August 08, 2012, 12:25:10 PM

Check the compression.

and then if the compressions low, off with the top end      

Title: 83 yz 100
Post by: oldyz100 on August 08, 2012, 06:27:54 AM

The pressure is Basically gone. I pulled the top end off one of the gaskets were pretty worn out , a dowel was missing, the piston looks scored and the engine  was making a rattling sound before it shut off. 

Title: 83 yz 100
Post by: riffraff on August 08, 2012, 06:45:35 AM

So the top end wasn't just done? It's amazing how many ads claim a fresh top end

Title: 83 yz 100
Post by: oldyz100 on August 08, 2012, 07:30:49 AM

Exactly got to love people .

Title: 83 yz 100
Post by: oldyz100 on August 09, 2012, 05:45:36 AM

The bike has been stripped.the piston was Completely scored and the ring was done the cylinder is good. Time for a new piston. New carb and hope it runs Its a raré bike.