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Author Topic:   Engine ignition problems
buster1389 posted 10-28-2001 10:49 AM ET (US)   Profile for buster1389   Send Email to buster1389  
I have a 1989 25 hp evinrude on the back of my 1962 13. I am occasionally experienceing what sounds like, the motor running on one cylinder. When it does this it runs extremely rough and can't get over 1/4 throttle. It seems to be missing slightly at full throttle. any Sugestions?
Mike
David Ratusnik posted 10-28-2001 03:02 PM ET (US)     Profile for David Ratusnik  Send Email to David Ratusnik     
I'd start by dumping the gas and replacing with 93 Chevron. Then, pulling the plugs and replacing.
where2 posted 10-29-2001 12:24 PM ET (US)     Profile for where2  Send Email to where2     
Remove, disassemble, clean, and reassemble carburetors. Sound kinda gummy with bits of trash floating around the bowls which keeps clogging your jets. Certainly, if David is right about the gas being part of the source, then a good carb cleaning can't hurt.
70_Katama posted 10-29-2001 01:18 PM ET (US)     Profile for 70_Katama  Send Email to 70_Katama     
I read a number of posts regrading carb rebuilds. Is it a relativly simple process? The last carb I rebuild was for a 351 cleveland about 20 years and It was a nightmare!Are there any simularities? I remeber lots of springs and adjustments.
buster1389 posted 10-30-2001 10:19 AM ET (US)     Profile for buster1389  Send Email to buster1389     
I thought about carboration, but it has a single carborator on it. I am going to take the carb off, and if i am really ambitious i will take it apart (who knows if i will get it back together).
grandmufti posted 11-04-2001 10:30 PM ET (US)     Profile for grandmufti  Send Email to grandmufti     
Sounds like your power pack is going bad.The next time it runs bad pull plug wires one at a time to see if spark is missing or intermitent.
Whalerdan posted 11-05-2001 02:03 AM ET (US)     Profile for Whalerdan  Send Email to Whalerdan     
Fuel line. Change bulb and line first.
goldstem posted 11-05-2001 09:39 AM ET (US)     Profile for goldstem  Send Email to goldstem     
I've had this happen
goldstem posted 11-05-2001 09:39 AM ET (US)     Profile for goldstem  Send Email to goldstem     
I've had this happen
goldstem posted 11-05-2001 09:39 AM ET (US)     Profile for goldstem  Send Email to goldstem     
I've had this happen
goldstem posted 11-05-2001 09:42 AM ET (US)     Profile for goldstem  Send Email to goldstem     
Sorry for previous noise

I've had this happen a couple of times with OMC motors - one cylinder cutting out occasionally. it wasn't the powerpack, but was actually the low voltage wire from the pack to the coil! with it running grab those wires (not the high voltage one!) and twist them around in your hand. When I did I could make the cylinder cut in and out. It can be an art finding the point of the break and then resplicing the wire. good luck

RSGAULT posted 11-05-2001 11:34 PM ET (US)     Profile for RSGAULT  Send Email to RSGAULT     
My first suggestion would be to spray canned carb. cleaner into the air intake with the engine running and see if the engine smoothes out. If it does, then the problem is a lean condition which may be caused by contamination in the carb. plugging one of the jets. If so it will need to be removed and overhauled. If there is no change then inspect for an ignition system failure.
buster1389 posted 11-07-2001 11:51 PM ET (US)     Profile for buster1389  Send Email to buster1389     
I have now changed both powerpacks, wires, and plugs. It made no difference. Next is to check the wires that go to the powerpacks.
Do these wires come from the stator?
Could the stator be bad??
thanx for the help
mike

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