Hello..... im having problems with this bike everyday. I have to start it literally everyday to prevent it from popping and backfiring. Also is the choke lever suppose to be stiff. When deacceleration takes place it pops. Can you please help me??
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2005 yamaha raptor 80 (soon belongs to my cousin)
2005 yamaha raptor 660r(fathers)
chinese bike
2008 yamaha raptor 250se(hopefully soon)

 

You may just need to do a valve adjustment. When was the last time if ever? Also check your spark plug. Running to rich or lean?

 

it did not have a valve adjustment sice i got it and i was thinking it would be the spark plugs. I think its running too rich from my research. Is it normal for the choke lever to be stiff?

 

sounds like its time for a tune up. adjust the valves, oil change, spark plug, clean the carb, etc... adjusting the valves will really make a difference though.

 

ok i'll try that, do you guys think the pilot screw has to do with it because my neighbour been saying it is the altitude?
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2005 yamaha raptor 80
2005 yamaha raptor 660r
2008 yamaha raptor 250se (soon)

 

altitude can definitely make a difference on the way your bike runs. with less air the higher you go, the carb will not compensate for it by adjusting the air/fuel ratio. less air means that it will be running rich (more fuel than air in the mix) have you ever jetted it?

 

no I haven't probably that will work though but will I have to put pipe and muffler on it when i have rejetted it?

 

Most all 660's have junk carb's from the factory putting on a Edelbrock single carb system will help wonders a bunch. Just a thought!

 

i think that will help vey much because the screws on the carbs have a green colour and everytime you would clean the carb the bike sounds better. Thanks!! I will try it
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2005 yamaha raptor 80 (on sale)
2005 yamaha raptor 660r (fathers)
2008 yamaha raptor 250 SE (soon)

 

ok sorry it took me so long but i was unable to get a mechanic so my dad rode it this morning and when i came back to ride it, it would not start but it keeps on spinning like it wants start but won't start. Help please!!!
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2001 yamaha raptor 660r
2006 yamaha raptor 80
2008 yamaha raptor 350(soon)