Yamaha 1990 4.3L Misfiring. My engine is running on 5 cylinders.

bucaneer

Recruit
Joined
Aug 29, 2014
Messages
1
Yamaha 1990 4.3L Misfiring. Number 1 cylinder has a weak spark compared to the other cylinders. It's not the spark plug or lead. Any ideas??
 

Chief123

Seaman
Joined
Feb 9, 2006
Messages
59
I would check the distributor cap an rotor. But not knowing much about the Yamaha system I would post my question in the Yamaha section and you might get better luck with a answer. Good Luck.
 

jerryjerry05

Supreme Mariner
Joined
May 7, 2008
Messages
17,923
The system you have on the it's almost impossible to have weak spark on just 1 cyl.
Test the lead, check the cap, do a compression test.
 

Chief123

Seaman
Joined
Feb 9, 2006
Messages
59
Low compression might cause it not to run or miss but it would have nothing to do with spark strength.
 
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