Question about Pit Bike 125cc 4 Stroke Dirt Bike
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Posted on Jan 02, 2017
SOURCE: my pit bike wont stay runnin
sounds like your carb could be blocked with dirt if it wont start unless you put juice down plug i would take the carb off and give it a good clean and also make sure the jets ok just clean them with carb cleaner and a paper clip
Posted on Aug 09, 2009
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
Your tickover when warm should be 900 - 1100 rpm. If you set this when the bike is cold it will stall when it warms up. If you set tickover when the bike was hot then clean your carbs. Look at your plugs after a blast, are they white? If they are then you are running lean. If your bike is running lean, you cleaned the carbs and set tickover correctly then check your valve clearances. RF valves are usually very good and will run 30k miles without needing re-shimming.
Posted on Aug 26, 2010
my motorbike wont go into gear at all the clutch feels fine and it goes into gear ok but it wont move when its in gear. jamie
Posted on Mar 20, 2011
SOURCE: Atomik Pit Bike
After hunting around the web for a few, it sounds like the spring is from the timing chain tensioner. It looks like there is a button on the end of the cylinder, that end goes in first, then the spring. See if the spring is the same on both ends, the picture looks like it's smaller at one end and that end goes into the tensioner, not the bolt. I'll include a screen shot of the picture.
Posted on Nov 26, 2011
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