1994 Fast Strike Problem

[tntony]

Got a 1994 johnson 150 fast strike runs fine until<br />it gets to operation temp then it loses about 1500<br />rpm at wide open throttle. have cleaned carbs and<br />cleaned tank the reason i say this is the boat as<br />set for about 1 1/2 years before i bought it. seams to do fine when i first put it in the water <br />but after about a mile or so it loses power. <br />compression seams ok not more than 5% at any cylinder.<br /> thanks for any help

 

[hondon]

Re: 1994 Fast Strike Problem

Alot of possibilities here .You may well be losing ignition on one or more cylinder.You may well have a carb going to hell at that transition.You've checked at least basically the mechanical health of this engine.Good for you.Get yourself a timeing light ,and a good buddy that you can count on not to dump you over the back of the boat.Run the engine with the light hooked up to any plug wire and point that light right in your face.Repeat this until you have looked at and compared all cylinders when this thing is failing.3 that have an almost continuous light ,but one that flashes hilly nilly or stops flashing at all means an ignition failure.Carb failures involve removeing the airbox and shooting raw fuel mix into each carb to see if it makes a differance.

 

[JB]

Re: 1994 Fast Strike Problem

Sounds to me like a heat related ignition failure, like Hondon says.<br /><br />A less hazardous way to look for it is to crank her up on the muffs and heat the ignition components with a hair dryer. Watch for rpm drop or use the timing light to isolate the cylinder(s) that fail, unless the heated component is the obvious fault.<br /><br />Good luck.

 

[tntony]

Re: 1994 Fast Strike Problem

Thanks for the help i will try these things this <br />weekend i have a timming light. i build super late<br />model race car engines 800 hp or so for dirt racing. but new to 2 stroke not ussed to the fuel<br />comming in the back door<br /><br /> again thanks