3 replies to this topic

[challenger1488]

I just bought this challenger 1800 when i hook it to a hose to start it on land motor runs fine. (it is hard to start and fouls plugs though). One wierd thing is it idles at 3000 to 3500 rpm and will not drop down below that. When i put it in the water the motor will try to start but it barely runs and is booged way down if i give it just the right amount of throttle it will shoot up to around 4000 sounding really good but then it just boogs down again. I replaced plugs with no change. once out of water the boat will start run and rev just fine. I work on cars for a livng so im no stranger to motors buthave very limited knowledge about 2 strokes. Any ideas would greatly help. Also i bought boat from mississippi and live in iowa i don't think the elavation diff would cause this though.

[Kevin Leclair]

It is very bizarre that you don't get the same type of symptoms when starting out of the water. What are the water conditions like where you boat, weedy?

[challenger1488]

No theres very few weeds in the lake. I did some digging as im replacing the exhaust manifold. i found that on the i believe its the mag carb the high speed screw was turned all teh way in and was broken off i tried removing it but it is seized. The throttle plates were also a little sticky io disasssembled the carb but found no real problems besides that jet being stuck. the other carb was nice and free and the high speed screw was about two or three turns out. could this have the effect im seeing both jet intakes look clean so i don't think its a problem there. From teh way the engine sounds when it dies it sounds like it is either starving for fuel of is getting fuel dumped into the cylinders. causer it will shoot up once like its going to take off then just bog down no matter what i do.

[challenger1488]

Got it figured out replaced both carbs running good now need to tweak the carbs a little then we will be all set