89 90HP,3cyl, Drops cylinder off and on

[wfowahoo]

90HP,89,2-stroke. Stored for ten years.Went through entire fuel system and plugs.

Idles along great. But it will drop a cylinder for a minute and then come back. When it drops a cylinder it is diffidently running on two cyl, will not get on plane. Then it kicks in the third cyl.

Going to look at grounds and cracks in coils. Any suggestions?

 

[wfowahoo]

Re: 89 90HP,3cyl, Drops cylinder off and on

Bump

 

[Faztbullet]

Re: 89 90HP,3cyl, Drops cylinder off and on

Going to look at grounds and cracks in coils

If all is OK on wiring /coils, take a timing light and attach to coil leads to see which cylinder is dropping. When you find it ,swap that coil with another coil on engine .If it still drops look at the trigger wiring and possible bad switchbox. I haven't seen many bad coils in 35 years....