Iv'e got a 02 eiger with about 300 miles on it. After a high speed run, when you let off on the throttle it backfires. I think this may be because it is running lean, but I can't find any adjustments on the carbuerator to resolve this. Any info would be appreciated.

 

Mine is brand new w/ 12 miles and it has a mild backfire right after I shut it off. More kind of a puff in the muffler than a backfire. I was thinking it was because it was new and still breaking in. Maybe it will quit with time. It doesn't when it is running though. Not sure about the carb adjustment, but an exhaust leak will cause popping on decelleration. I doubt your quad has a leak, but you can check it out to be sure.

 

fsteiger
My 375 does the same thing and so did my old 250 4x4. Cats have been known to backfire, since they use Suz motors I'm willing to be it a common thing. There's an adjustment **** on the carb, reach up and you should find it. It just sort of hangs in never never land (at least on my Cat) on a flexible shaft of sorts. Sorry I can't explain in better details I'm here at work and the wheeler is back home.

 

Mine does it too. If you go from full throttle to nothing it will do it every time. Even though you let off, a little fuel still pumps. When I shut mine off it puffs also.

 

I experienced horrible cold weather starting with my 03 Eiger 400 4X4 but I found the problem. The problem is the air vent tube leading from the Keihin CVK32SS carburetor through a hole in the plastic bodywork terminating in a hole on the back side of the fuel tank plastic. My Eiger was assembled incorrectly by either Suzuki or my dealer. I am not sure who routes the line in question or when it occurs. The air vent line was routed to the edge of a plastic cover and bent hard around the corner instead of being routed through the as-designed hole that allows a smooth bend in the line. The 5 minutes of cold start warm up time everyone mentions is the key to finding the problem. When the air vent line is pinched and cold the ability to flow air through the tube is reduced. The air vent tube is located close to the exhaust header. It takes about 5 minutes for the area to warm up and then warm the air vent tube enough so it expands and relaxes the crimp allowing almost normal air to pass through it. I needed to replace the air vent line as it was permanently crimped and routed it correctly through the as-designed hole in the plastic cover. My Eiger would then start normally with full choke for only about 30 seconds accepting throttle inputs right after that. This was tested at 15 degrees Fahrenheit in Northern New York.

Good Luck