Home › Forum › Ask A Member › Leaking crankcase leads to overheat condition? › Re: Leaking crankcase leads to overheat condition?
J6’s are fine to run in that motor. I’ve ran lot”s of 18’s with that plug. It’s actually better than the J4. If your crank case is leaking, you should find evidence of it, with fuel leaking out, while it’s running. I would definitely check your cooling system for restrictions. Make sure the passage all the way up to the power head is free too. If it’s a salt water motor, then they like to block up in the mid section, where the copper water tube goes in. I’ve found a few like that. A flex line like you would find on a lawn mower throttle cable is ideal for checking the water passage there. Once you check the water tube area, run it for a sec, with the thermostat out and the cover off. Water should come gushing out of there.