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1989 Yamaha 90 hp, intermitten power loss
bigmike0601	#1  Posted on 07/18/09 - 1:48 PM
Member Posts: 50 Comments: 0 Joined: 03/29/09	I'll get up to high speed then the power takes a step down and stays that way. Sometimes the power is there while getting back up and sometimes not. Almost like it's going from 3 to 2 cylinders. Haven't started trouble shooting yet. Any ideas where to start?
Phil T	#2  Posted on 07/18/09 - 4:23 PM
Administrator Personal Page Personal Album Project Albums Posts: 7043 Comments: 6 Joined: 03/26/05	Check the boot on the spark plugs wires. One could be old and not staying snug. Not a bad idea to change them out after 20 years of use. Pull the plugs and inspect them each carefully.
bigmike0601	#3  Posted on 07/20/09 - 7:09 AM
Member Posts: 50 Comments: 0 Joined: 03/29/09	I just snugged up on the boots and havent didnt have an issue most of the weekend. I'll check the plugs and replace then move to new boots if still a problem. Thanks!
Bake	#4  Posted on 07/20/09 - 8:41 AM
Member Personal Page Project Albums Posts: 902 Comments: 8 Joined: 01/30/06	I had a friend that got a pin hole leak in the water jacket cover plate there on the back of his 70 yamaha. The water was getting on the plug and wire causing some issues. I doubt you have the same problem just thought I would toss it out for something else to look at.
Frank Jones	#5  Posted on 07/26/09 - 1:08 PM
Member Posts: 1 Comments: 0 Joined: 07/26/09	Years ago, I had a similar problem - turned out to be a pin hole in the fuel line so that it was sucking a little air.