1990 135 merc very little power.

[ikes]

i own a 1990 135 merc over the last few years it seems to loose power. it starts fine when its cold but when its warm i have to put the cold start leaver all the way up like to start a cold enigine. also i have to go with the waves on a windy to get it up on plane ive changed the plugs and wires and fuel filter i have not done a comp. check yet.any help would be appreciated.

 

[Valv]

Re: 1990 135 merc very little power.

Time to repower....how much you want from yours ?? <br />Just kidding (it happens I am looking for a 115hp to 135hp to work on).<br /><br />Anyway, definitely a compression test will help immensely, even a cheap tester witll let you know what your motor is doing.<br />You will have to look for a noticeable difference between cylinders, at least 10% or more.

 

[Hooty]

Re: 1990 135 merc very little power.

While the engine is struggling either give it a real quick choke or use a squirt bottle of premix and give the carbs a shot of raw fuel and see what happens. It's a starting point.<br /><br />c/6<br /><br />Hooty