Question about Boating
Hi! on XR1800 jet boat the starboard engine doesn't run over 3000 rpm and the spark plug in the middle cilinder remains clean (not working?) All three have compression. On each cilinder sparkplugs show fire. Starts and holds idle ok. I've changed wire but it didn't help. When attempting to add throtlle higher smoke occurs from exaust. The water seems to cool the engine ok. thank you!
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Posted on Jan 02, 2017
Hello enjoy42. From the information you have provided I would lean to the weak cylinder coil. Unplug the good spark plug wire & test run the engine on the weak cylinder. You could go to swapping the coils on the cylinders. Check your wiring terminals on the coils. Check with a marine dealer for the correct plug. I owned a 35 Evinrude on a Bass boat & it would out run my buddys 40 Mercury. Good Fishing.
Posted on Oct 03, 2008
Check for air leaks in the vacuum pipes in and around the inlet manifold, they have a habit if going brittle and splitting.
Another possibility is the temp sender , if the ecu thinks the engine is too cold it will compensate causing the engine to " hunt". This can be something as simple as a worn radiator cap seal letting air into the cooling system and tricking the sensor.
Hope this helps, Marshall
Posted on Apr 29, 2010
Has the bike been stored for any long length of time?
old fuel in the carburetor will turn to a varnish like residue blocking the jets,or possibly water in the carburetor.
Posted on May 03, 2010
Testimonial: "The bike was not stored and was ridden regularly, but it still sounds like it could be the carburetor. Thanks for your insight."
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