alan_in_vt
New member
I have twin crusader 454s in a 1987 Bluewater 51 with 1500 hours on them. Both engines run perfectly at all speeds. The port engine is producing a lot of sheen in the water as raw gas coming out of the exhaust. I noticed last year that the port engine had soot on all 8 plugs rather than the tan/grey look on the tips that they normally have after 100 hours of use. This engine burns about a quart of oil in 40 hours of use. The engine runs very smoothly at idle and at cruising speed and never stalls on docking.
In trying to solve the problem, we had the automatic choke replaced in case it was not opening properly. No change. My mechanic noticed the carb had some bubbling of gas at idle as seen from above looking down into the throat of the carb. My mechanic (lots of experience) suggested using a kit to rebuild the carb. There was no change. In case there was something wrong in the first kit, he rebuilt the carb again with a new kit. No change. We then had the carb replaced with a factory rebuilt carb and still no change in the gas sheen coming out that exhaust. Any ideas?
In trying to solve the problem, we had the automatic choke replaced in case it was not opening properly. No change. My mechanic noticed the carb had some bubbling of gas at idle as seen from above looking down into the throat of the carb. My mechanic (lots of experience) suggested using a kit to rebuild the carb. There was no change. In case there was something wrong in the first kit, he rebuilt the carb again with a new kit. No change. We then had the carb replaced with a factory rebuilt carb and still no change in the gas sheen coming out that exhaust. Any ideas?