Search results

  1. A

    70HP YAMAHA 1990 only runs on 1/3 cylinders!

    I will try that thank you for your help and knowledge! I appreciate it a ton
  2. A

    70HP YAMAHA 1990 only runs on 1/3 cylinders!

    So after cleaning the carb it started banging on all 3 cylinders but 1-3 seem very weak and not firing like they should. I can run the engine on any 1 cylinder alone now but have to keep throttle to 1-3 to keep it alive on #2 it fires up and idles great alone. When I squirt gas with all 3 coils...
  3. A

    70HP YAMAHA 1990 only runs on 1/3 cylinders!

    It has good compression and it fires just fine I swamped coils and no difference so they are all good. It bangs healthy on #2 but 1-3 seem weak the engine will run on just the #2 cylinder fine but if I try just 1 or 3 alone I have to keep the throttle to it or it’ll almost die. I sprayed gas in...
  4. A

    70HP YAMAHA 1990 only runs on 1/3 cylinders!

    I have a 1990 Yamaha 2 stroke 70hp it starts fine but won’t surpass 1500rpm & it cuts out. I unplugged the coils while it was ideling to see if it would change the sound of the engine and I had 2 out of 3 coils off without a change in engine sound or power. Only 1 cylinder was producing power! ...
Top