How to Test Coil Pack. Yamaha 70

[JALE Time]

I have an 88 Yamaha 70 HP. Been running fine all season. Today, had it about 3/4 throttle and it just lost all power. It will idle and run at low RPM's great. Will not shoot out of the hole. Killed it and let it set for a few minutes. Shot me out of the hole and ran fine for a couple of minutes then did the same thing. Could this be a coil pack? Had the carbs rebuilt last summer by a yamaha dealer. Been reading post about cleaning carbs and replacing fuel pump. What do you think? Carbs? fuel pump? coil?

 

[99yam40]

Re: How to Test Coil Pack. Yamaha 70

Check your alarm system to make sure it is functioning properly.
Sounds like you motor is going into safe mode for overheat or other problem and your alarm is not letting you know with the buzzer

 

[houghton]

Re: How to Test Coil Pack. Yamaha 70

I had a similar fault on my P60 1992. Just had the whole thing in bit only to find a broken wire on the coil pack. i thought thios would have caused a serious misfire but seamed to run ok. Check your resistance across all coil packs that will give you a rough indication

cheers

 

[JALE Time]

Re: How to Test Coil Pack. Yamaha 70

Gonna buy a book on it tomorrow and do some research. Thanks for the advice.

 

[junaidi]

yamaha 2 stroke 85 hp ae 688

yamaha 2 stroke 85 hp ae 688

Anybody know what is the atdc and btdc timing number?and how to do the timing manually.And any tips to tune the engine carb because when the throttle engaged to forward,the engines dies.

 

[robert graham]

Re: How to Test Coil Pack. Yamaha 70

Sounds like fuel delivery problem, check gas tank vent, pick-up tube, tank fittings, primer bulb, quick disconnect on motor cowl, fuel pump, fuel filter, drain each carb to check for water or debris. If all is O.K. on those then carbs may need cleaning. Good luck and let us know what you find!