Question about Suzuki Boulevard S40 Motorcycles
After running the exhaust pipe is getting red hot
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Posted on Jan 02, 2017
SOURCE: Exhaust glows bright red.
These bikes dont like to idle for very long. If you ride at a reasonable pace, it shouldn't glow for long. If it persists... Your jetting is too lean. Check out thumpertalk.com for a pictorial step by step how to re-jet
Posted on May 08, 2009
Usually this indicates a lean fuel/ait mixture. Remove the main jet and note the number stamped on it. Go to your dealer and give him the VIN from the frame. From that number he can tell you exactly what year, model and engine size you have. Now ask them to check the stock main jet number. If different than what is in the bike then get the stock jet. Check the manifold between the carb and cylinder. If any rubber seals or hoses are hard, then replace them. This will eliminate air leaks on the intake leaning the mix. The image below is for a 1995 model. On the carb main jet and nozzle (in red), make sure they are very clean inside and out.
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Posted on Jul 02, 2009
Several things are possible. The baffles inside the muffler may have partially collasped causing a restriction in the exhaust. The fuel / air mixture may be too lean. A lean mix burns hot. The stock main jet is a #178 (stamped on the jet). Try a richer jet, #180 or #182. Also, use only premium gas without ethanol. Be sure your gearbox oil is clean 10 w 40 motor oil. NO SYNTHETIC LUBRICANTS. Check the radiator coolant flow and temperature to be certain the engine is getting cooled as it runs. Be sure mud /trash is not blocking the radiator fins. Also check the spark plug. The stock plug is an NGK CR8EB. Replace it with a colder plug, NGK CR9EB
Posted on Aug 02, 2009
the pilot jet is too only make the bike idle so it wouldnt be this is the engine have lots of oil in the engine
Posted on Oct 01, 2009
Testimonial: "I haven't thought of that but I will put a little more oil in it and try it again. Will let you know the results later. Thanks"
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