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Motorcycle looses power or shuts off. Spark plugs covered in carbon, especially the front cylinder.? |
1986 HD Sportster 883XLH. Started when bike would just shutt off while riding. Brought it to mechanic and they did a carb rebuild and installed a new tank and fuel valve since the original was corroded. Bike did run for a while but then periodically there is no power at take off and bike almost stalls. After checking out the bike, I noticed that the spark plugs get covered in black carbon, escpecially the front plug. I am wondering if the plugs are the reason for the poor performace. I carefully cleaned and checked the gap and reinstalled plugs but it happens again. I use very little choke only when starting the bike in case it is from too rich air/fuel mixture. I also checked the air filter and it looks good. Any ideas why this happens? Is it related the the valves of something else? Is there a way to check it, without being a mechanic with all the tools? It would be nice to get an idea before attemting to go back to the shop. Thanks for any help. i see the cause being either 1: carb is adjusted too rich, 2: u have a bad carburator intake gasket. i have just the site to steer ya to for some actual trouble shooting help. http://www.harleychatgroup.com just register, and post ur problem in as much detail as possible in the sportsters section of tech help. u'll get more actual help there with this problem than here by a wide margin, and there's alot of good dudes there. Sounds like oil getting into the combustion chamber... bad piston ring (especially if on one plug only) ?????? It is running too rich. You need to adjust the carb to lean out the air/fuel mixture. This shouldn't have anything to do with the choke, unless some mechanical failure within the choke is preventing it from being shut off all the way. Sounds like there is a problem with the #1 piston. There might be oil in the combustion chamber. Or one the piston rings have gone. Better get checked out before it gets worse. May also be an electrical problem. Magneta going bad, bad wiring, etc. Black carbon won't hurt, white will which means you are burning oil. Carbon conducts electricity. Take a plug out and plug it in and ground the base to the base of the motor, then start it and watch the spark. When the bike quits running, watch and see if it still sparks while the motor is winding down to a stop. If not, then it is electrical. You can also buy meters for this instead of going to this trouble, but that is the cheapest way. Problem still sounds like a rich one. Number one guess would be the carburetor adjustment. They are pretty easy to do yourself. You will have to (or should) buy a manual. If you adjust and you still have problems, purchase ''Hotter'' plugs. Hotter plugs run hotter so they prevent fuel fouling. Usually you can take the plug number (lets say ''RY22F''), and lust increse the numerical portion (to ''RY26F'') and you will have a hotter plug. LIFE |
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