Question about Motorcycles
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Posted on Jan 02, 2017
Your bike may be jetted too lean. A common problem in these days of overzealous EPA regulations. You can tell if when you've cranked your throttle wide open and it splutters, if you back off on the throttle about 1/8 to 1/4 turn, it clears up. This is indicating that it is jetted too lean. When you close the throttle slightly, the fuel is being metered by the main jet and by backing off on the throttle a bit, you're cutting back on the air, thereby bringing the mixture closer to what the engine needs. Try rejetting the carb, Go up one or two sizes on the main jet, one step at the time.
Now, it could be too rich as well. If it splutters and blows black smoke out the exhaust, it either jetted too rich or the float level in the carb is set wrong.
Take care of the simple stuff first before rejetting the carb. Make sure your spark plugs are the correct ones and they are not fouled from overusage of the choke or enricher. If you allow the bike to "warm up" with the enricher on, plug fouling is common with this practice. I get the bike started and as soon as it will run without the enricher or choke on, I turn it off and keep the bike running with the throttle. Don't foul as many plugs that way.
Posted on Nov 10, 2009
Sorry to be harsh but you NEED to check if you have a spark before we go further, simply take the distributor cap off the spark plug and find a socket to fit the plug... then take out the plug and put the plug back in the distributor cap.. then hold with pliers (rubber handles so you don't get a boot from it) and hold it against a clean part of the frame. Now try starting your bike and you will soon know if your getting a spark or not, alternatively get a tester screw-driver and clip the clip on a earth and put the screw-driver into the distributor cap (saves taking out spark plug) and if it lights up then you have one. This may mean you need a mate if the bike aint electric start as you will need someone to kick it as you check for a spark... Hope this helps
Posted on Oct 25, 2010
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