Yamaha Forums banner
1 - 4 of 4 Posts

·
Registered
Joined
·
2 Posts
Discussion Starter · #1 ·
Good Morning, I have a 1988 Zuma, it was running fine but I wonted to go faster so I put a 70cc big bore kit and a Ex. on it. It ran fine for a couple of days then wouldn't start, I check the spark, I check the fuel, then I check compression and found I had 30 lbs. Pulled off the big bore kit and installed the stock cyl. and head with new gaskets. Still only have 30 lbs. of compression. Any ideas?
 

·
Administrator "Loose Nut" - From Houston, Texas
Joined
·
198 Posts
What I was actually asking, hose seated with oring, full throttle and several revolutions of engine. I've found you need at least 8 revolutions. So you are only getting 30psi with 2 different jug and piston setups you have a top end issue.
 
1 - 4 of 4 Posts
Top