sjc115
06-13-2005, 05:36 AM
Yesterday I went riding for about 2 hours and, as usual, my quad ran great all day. Made good smooth power, started easy, no hiccups.
I started the quad for what was to be our last run of the day and hit the track. I rolled onto the track and started getting up to speed. I shifted from 2nd to 3rd and pinned the throttle, as I always do, at the base of this one hill (more like a poor attempt at a small step up jump). The quad was way down on power and started to sputter with a real light backfiring sound. After I crested the hill, I backed way off the throttle and rolled around the next turn and up over a table top jump. Then the motor quit. It felt like it was not getting any gas. I checked to make sure the gas was on and there was fuel in the tank, both were ok. I started the quad again (much harder to start now) and let it run for about 30 seconds while revving it a little hoping that there was just some dirt in the carb that needed blown out. I started off again keeping the speed and throttle low for a few corners. As soon I as got on the gas hard, the same thing happened.
We loaded up and went home. Thinking it might be a dirty air filter (it was real dusty at the track). I washed the quad and started it up (again, hard to start like it wasn't getting enough gas). I lifted the rear end of the quad on a jack, put it in 2nd gear and let it run. It would not idle reliably without blipping the throttle periodically. When revved to full throttle, it would pop and backfire. I sprayed carb cleaner down the intake tube (in short bursts while revving the motor a little bit) but that did not seem to make any difference.
I have eliminated the air filter as the cause, what should I check next? Bad plug, bad gas, dirty carb, electrical problem, valve adjustment problem (vavles were adjusted 5 rides ago)???
Like I said above, it acts like it is not getting enough fuel when the throttle is applied. As long as I apply throttle slowly, it will rev up smooth until about 2/3 throttle and then it just starts popping and wants to quit.
The motor is a stock 350x with a 250x carb and has ran very well until this instance.
Help!!
I started the quad for what was to be our last run of the day and hit the track. I rolled onto the track and started getting up to speed. I shifted from 2nd to 3rd and pinned the throttle, as I always do, at the base of this one hill (more like a poor attempt at a small step up jump). The quad was way down on power and started to sputter with a real light backfiring sound. After I crested the hill, I backed way off the throttle and rolled around the next turn and up over a table top jump. Then the motor quit. It felt like it was not getting any gas. I checked to make sure the gas was on and there was fuel in the tank, both were ok. I started the quad again (much harder to start now) and let it run for about 30 seconds while revving it a little hoping that there was just some dirt in the carb that needed blown out. I started off again keeping the speed and throttle low for a few corners. As soon I as got on the gas hard, the same thing happened.
We loaded up and went home. Thinking it might be a dirty air filter (it was real dusty at the track). I washed the quad and started it up (again, hard to start like it wasn't getting enough gas). I lifted the rear end of the quad on a jack, put it in 2nd gear and let it run. It would not idle reliably without blipping the throttle periodically. When revved to full throttle, it would pop and backfire. I sprayed carb cleaner down the intake tube (in short bursts while revving the motor a little bit) but that did not seem to make any difference.
I have eliminated the air filter as the cause, what should I check next? Bad plug, bad gas, dirty carb, electrical problem, valve adjustment problem (vavles were adjusted 5 rides ago)???
Like I said above, it acts like it is not getting enough fuel when the throttle is applied. As long as I apply throttle slowly, it will rev up smooth until about 2/3 throttle and then it just starts popping and wants to quit.
The motor is a stock 350x with a 250x carb and has ran very well until this instance.
Help!!