FAQ Forum

This is where we place threads about common issues routinely seen to make it easier for users to quickly find suggestions for those issues like "My bike won't start", "My bike fouls plugs" etc.  
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Dave H 2006 YZ250
(2008 YZ 125 son)

Here is a simple check list for the popular "MY BIKE WONT START WHAT IS WRONG WITH IT"

first of all it takes three things for an engine to run  SPARK...FUEL...COMPRESSION...thats it nothing more nothing less so if your bike wont start make sure you have all three elements present...if one is missing then replace it or find out why its not there

fresh fuel (fuel starts to gel after 30 days)
new plug (outta the box)
proper compression (no blowby, or piston seizure)  

There is oil drooling from the silencer of my bike - should I put less oil in the gas to eliminate it?

NO!  It makes perfect sense that the less oil you put in the gas, the less oil will come out of the pipe, but in the real world it doesn't work that way.  By reducing the amount of oil you put in the gas, you are actually RICHENING the air-fuel ratio, which inturn lowers combustion temperatures, and creates even MORE oil out the tailpipe.

The cause of unconsumed oil is combustion temperatures that are too low.  Stick with a 32:1 premix ratio (you can go as little as 40:1 on some bikes) and then adjust your jetting a little leaner.  That will clear up the oily mess.  A little oil out the pipe is normal, but is should not be a river of black goo  
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Here we go again!

Why does the gas stort pouring out of my carb when I turn the fuel on?

well you have a dirty carb...here is a simple check list and cleaning inspection...


remove seat and the two bottom bolts of the sub frame (no need to remove top bolt jsut behind gas tank...loosen airbox band and the rubber band around silencer muffler connection and lift up on rear fender airbox and silencer should pull away and up out of the way and still be connected to bike...remove gas line...disconnect wires to carb and loosen front band on carb so you can remove it from bike...there should be enough throttle cable for you to get carb above bike to work on it...

clean carb (with carb cleaner) thouroughly make sure its very clean...turn upside down and remove the four screws pull away the float bowl...pull out pin at hinging point of float and slowly remove float and needle from the carb...inspect needle for wear is anynoticable replace needle and seet...clean all internal parts of carb with carb cleaner..do not use an air hose do not use an air hose do not use and air hose...I use ample amount of cleaner to make sure all and everything that might be in there is out...now when you think its clean give it one more shot just to be sure then pur it back together in the reverse order...but before you put bowl back on turn carb upside down and check the float it should be level with the carb not up an bit not down a bit but level...there is a metal bar that needle is hanging from you can adjust for proper float level once this is done keep carb upside down and blow with your mouth into the fuel intake hole...thats right wrap your lips around the intake and gently blow you should not hear any air coming out...while you are blowing lift the float with your free hand until you hear air coming out the release the float and the air should stop if it does good job...if not you need to replace the needle and seet...once this is done replace everything in the reverse order of taking it apart and happy trails...





any questions?


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if the gas starts pourin wile ur riding turn off the gas and tap on the float bowl it can dislode the float and its good as new  

replace power-bands often for snappiest powergains  
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1998 cr125
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