MCX 180 back firing

[Stoli]

I installed a MCX 180 kit this fall. Starts and idles good - when i give it some throttle it back fires quite a bit. Flames and sparks.

It still has the old fuel from last January - i need to change that out.
Could that be the issue or has anyone seen this before.

Idles good - back fires when i hit the throttle.

Help please. Heading to MT in 3 weeks. We are looking at heading to MI this next weekend for a tune up ride and i would like to address this before getting up there.

 

[MotoPsycho]

Drain fuel immediately.

It is very likely that there is a fair amount of moisture in it, and that is a wreck waiting to happen.

Put some 91 in it... or 93 if you can find it out there.

Post up results.

 

[mrtwostroke]

Can be the T.O.R.S. check your throttle cabel.

 

[YamaMTX]

Stoli where are you headed in MI? I did a Ulmer kit and also am looking for a tune up ride.

 

[Stoli]

Stoli where are you headed in MI? I did a Ulmer kit and also am looking for a tune up ride.

Not exactly sure yet. Probably between Ironwood and Twin Lakes

 

[Stoli]

Seems to have been a bad ground - thanks Alan and Scott.

Put a new subframe in and had it powered coated.... needed to sand off that front grounding area

 

[YamaMTX]

nice find! If you ever have a spot open let me know. I like to go to MI and also out west.

 

[Super Sled]

nice find! If you ever have a spot open let me know. I like to go to MI and also out west.

X2 Stoli!

 

[YamaMTX]

Super sled, what did you get for snow? only 2 inches here

 

[Super Sled]

Ya not much here or up the shore. Supposed to get two to five inches, but got two at most