Suzuki Quadmaster Problem

[Ed Morris]

I have a 2001 Quadmaster. Bought it from the original Owner. Its in Excellent condition for a 2001. The guy said there was a carb problem when I bought it. It seems like it is not getting fuel. I took off the tank, cleaned it, replaced the gas with fresh Gas, Installed a New Gas Valve. Then rebuilt the carb with a Carb Kit. Started it up and same damn thing, seems like its starving for gas. It will also backfire out the exhaust while trying to accelerate. Now the weird part. I started it the other day and it ran great. We went for a ride and it ran as if nothing was wrong with it. Started it the next day and back to running crappy again. I was like WTF !!! ... Anyone have any ideas of what the problem could be?

[Ajmboy]

When you start it, are you using the choke? What's off is that you seem to addressed all the fuel issues and rebuilt the carb. Have you changed the plug and wire, checked the air box/filter as well or are they all good?

[Ed Morris]

Changed the plug but not the plug wire.

[Ed Morris]

yes , I use the choke and back off on the choke as its warms up.

[Frank Angerano]

Does that bike have a rev limiter? Just a shot in the dark once I heard back firing. May be an issue. 

[Ed Morris]

Not sure but it seems to run when it feels like. Then run like crap.

[meinsheizer]

Backfiring is usually a sign of the exhaust valve not shutting properly. Time to take the head off and clean the built up carbon and also adjust the valve lash. I'm guessing its past 1000 miles on it and probably never has been done.

[ScrappyD]

Also check your vacuum pipe and fuel feed pipe for splits, check the carb mounting rubber too ..... if they suck air in from rubber splits/leaks it causes the same symptoms.

[Mech]

Couple of general rules..

If they spit/backfire out the carby, it's usually too lean, so air leaks into the manifold, lean mixture, tight inlet valve etc.

If they backfire out the exhaust while going downhill or with the throttle off, it can be an air leak at the head to exhaust  connection or back between the front pipe and the muffler.

If they backfire out the exhaust as you are throttling on, it's likely to be caused by an intermittent lack of spark or incomplete combustion, which is letting unburnt gases into the exhaust. Then you need to check the ignition system.. and secondly the mixture.

Just general rules... but it's mostly right.. But hey.. for every rule, there's an exception !

Edited December 30, 2020 by Mech

[Hunter19]

I had a similar problem with my 1998 Suzuki King quad started right up idol perfect as soon as I gave it gas it was sputtering and backfire and no power rebuilt the carburetor and Thats right WTF. I threw in the towel gave it to this guy on Long Island and he found that my rectify it was bad. BAD RECTIFY !

Edited January 11, 2021 by Hunter19

[Mike Johnson]

I have one of those too, the gas is fed by a vacuum, check the 2 pipes just below the gas tank bolt, take the seat off and they are right there in the front, run a piece of wire through it to make sure it's clear. The arrow on the. petcock should be up or down, in the middle it primes the carb and will fill the engine with gas if you leave it there. Mine fired right up after I cleaned the vacuum lines. I had to replace the rectifier also and rig the wiring, and got it wrong , it doesn't charge the battery but I ride it every day, that's why I'm here trying to find out which wire goes where.