Backfire Through Airbox?

[bigsur]

I took the sled around the yard a bit today (not enough snow for trails yet, bummer), and the first time I let off the throttle the engine sounded like it backfired through the airbox very violently (not an exhaust pop). After, the engine stumbled for a split second and then ran fine. The sled is a 2006 RTX, 4000 miles, 300 on new y-pipes and donuts. i let the sled fully warm up (low idle) before I took off. The sled is stock except an Ulmer stage 2 clutch kit. Any ideas? Should I be worried at all?

 

[shanksyamaha]

If this is your first time running the sled I would guess its just burning some condensation from inside the motor or intake from sitting. I would run some seafoam through with some fresh gas and then see how its acting. My guess is its nothing to worry about.


I see you're in Rochester. Come on up and ride, trails are great up here...

 

[breakinbarrs]

Old fuel will do many things. Burn off the old crap and you will probably see a major difference in the sled. My Daughters RX1 seems even more susceptible to poor fuel than the fuel injected but still runs like sh$t till fresh fuel is in it.

 

[shanksyamaha]

Old fuel will do many things. Burn off the old crap and you will probably see a major difference in the sled. My Daughters RX1 seems even more susceptible to poor fuel than the fuel injected but still runs like sh$t till fresh fuel is in it.

Yup, The fuel sitting in the carbs makes it worse than the FI models. Usually a can of sea foam and some good gas and its like new again, unlike a 2 stroke which may just blow up if you try to burn out the old fuel. Been there done that... LOL. I think if you ride it some it will be fine... Check and make sure your airbox is still clamped to the throttle bodies. The backfire could have blown it off.

 

[tomanytoyz]

Suck it out the old s--- and put in new fuel with a good dose of sea-foam.bad fuel can also take out plugs and that would suck.

 

[Mighty]

Fresh plugs would be a good idea too. Might as well add a few ponies and go with ngk CR10EK's. You can get a set of 4 on amazon for about $25.00 shipped.

 

[shanksyamaha]

Yup, I installed my cr10ek's, Not sure if I noticed anything but everyone says they pick the sled up a couple HP..

 

[LJ 452]

Run it a bit more, if it continues I would check the header pipes carefully. Mine cracked and I didn't notice the first time around. Probably just old fuel but like I said if it continues might e worth a look.