Apex backfire

[isbsbses]

need help with my 07 ER. After she is warm and I let off the throttle coming into a corner, I get a wicked backfire. Thought it was a fuel issue but after 5 tanks of new gas its still at it. any thoughts?

 

[Snowmobileaddict]

You most likely need to service the exhaust donuts...

http://www.ty4stroke.com/viewtopic.php?t=52520

 

[Super Sled]

X2 on Snowmobileaddict's learned advice.

 

[isbsbses]

thanks

thanks for the info and the break down. I will dig into it this weekend. Love this forum.

 

[Preacher]

Is the backfiring caused by cold air entering in because the exhaust donuts are not sealed

 

[granto211]

Donuts or y pipe. These frickn yamahas should come with a sticker saying your donuts r fu#%ed if u hear backfireing

 

[Snowmobileaddict]

Is the backfiring caused by cold air entering in because the exhaust donuts are not sealed

Unburned fuel in the exhaust tract should be nearly devoid of O2. That is why there is no backfire when your donuts are in good repair.

When the donuts wear out, air gets drawn in and that unburned fuel goes snap-crackle-POP.