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  #1  
Old 07-18-2014, 08:30 PM
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Default 2007 RMZ250 backfires like hell

     

My rmz backfires alot and bogs a little bit when i accelerate from 1/2 throttle to full throttle
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Old 07-18-2014, 08:44 PM
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More info needed......
What have you checked?
Is the engine fresh?
Has the bike set for a while?
Was old fuel left in the tank and carb?
How is the spark plug?
Have you cleaned the carb?

Paw Paw
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Old 07-20-2014, 09:14 AM
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Bike has been sitting for quite a while but i also experienced this when i was riding almost every day for a whole week and i put new gas in everyday

New sparkplug has been running for about 10-15hours.

The carb was cleaned and re-jetted recently.

Can this be because of valve clearance? My valves are quite worn.
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Old 07-20-2014, 09:18 AM
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Worn valves can do this.
If you rejetted the carb too lean it can also do this.
If jets are plugged it can do this.
If accelerator pump is bad it can do this.
Is the fuel screw o ring sealing good?
If the cam chain is worn it can do this.

Paw Paw
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