Loss of power 1991 Yamaha 175

Walt1296

Recruit
Joined
Apr 5, 2005
Messages
2
Engine starts fine and idles fine. Top end speed is only 25mph and had been 50 mph. I suspect an intermittant powerpack problem as some times it will accelerate with no problem, and other times, it won't plane off. <br /> How many power packs does the 91 Yamy 175 have? Where are they located and can I test them with an analoge ohm meter? What setting do I use on the Ohm meter. Are the power packs easy to replace and what is the cost? What would be the labor time that I could expect to have to pay if I took it to a shop? Will continuing to run the motor with a bad pack damage the engine? Sorry for so many questions.
 

rodbolt

Supreme Mariner
Joined
Sep 1, 2003
Messages
20,066
Re: Loss of power 1991 Yamaha 175

you can do limited tests with an analog meter. not many on the CDI itself. you have to have a peak reading meter or a DVA adapter for a DVM.<br /> CDI problems are rather rare but do happen as do stator problems. a methodical diagnoses is in order. takes an hour or so to test all ign components if the problem can be recreated at the shop.
 

JB

Honorary Moderator Emeritus
Joined
Mar 25, 2001
Messages
45,907
Re: Loss of power 1991 Yamaha 175

Howdy, HiTide.<br /><br />Welcome to iboats. :) <br /><br />Troubles are posted in the Troubles Fora.<br /><br />I will move this for you.
 
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