Please Read, i need some help.

[clower55]

ok idk if its just the cold weather or what but my quad bogs so bad when i give it full throttle, the only way to fix it is the pull in the clutch real quick and pucnh the throttle or just shift up, i just got this thing serviced and they said it was fine now they replaced the cdi box or w/e for me. help me plz

 

[yamarider]

If you're saying they replaced the CDI because you bogged when you hit the throttle, make a note to never go back there again...

Sounds like it's running lean, the accelerator pump isn't working, or a combination of the 2.

Is it rejetted for the exhaust and filter? With the colder weather you will also need to have it jetted a little richer than warmer weather because the air is more dense. Check the spark plug if you're not sure about the jetting, if it doesn't have a light brown/tan color on the insulator you have a jetting issue.

 

[clower55]

ok , thanks but maybe it wasnt the cdi box, they replaced whatever regulates the spark or something like that idk. my dad dealt with the guys.

 

[jasonp]

yup sounds lean on the main jet or accel pump like Greg said.

 

[madcow]

I had the same thing, turns out the accel pump was stuck. Take off the airbox tube, look into the mouth of the carb and mash the throttle, you should see a small stream of gas go toward the motor.

 

[clower55]

how much do new accelerator pumps usually cost?

 

[yamarider]

There usually isn't any reason to replace the accelerator pump. The only part that is actually replacable is the pump piston, the spring, and the rubber boot. Most of the time the problem lies in the spring being missing, broken, or too weak, or the float bowl being installed in such a way that the piston gets pinched and can't move freely.

Start by replacing the weak stock spring (if it's even there anymore) with a spring of similar length out of a "click click" pen. The springs from pens are usually the right length, and are stiffer than the stock one so it's not so likely to get hung up when returning position.

 

[yamarider]

I had the same thing, turns out the accel pump was stuck. Take off the airbox tube, look into the mouth of the carb and mash the throttle, you should see a small stream of gas go toward the motor.

I just wanted to comment on this, this is a VERY poor choice in checking the accelerator pump. Because if the pump does work there is a possibility of getting a faceful of 93 octane, and that **** just feels great when you get it in your eyes. Normally the fuel will shoot out towards the engine, but that's not always the case, the needle that shoots the fuel can be installed any direction.

 

[clower55]

geez, i'm gonna have to bring it into the shop cuz i have no idea when it comes to carbs, my one weakness...

 

[yamarider]

There's really not much to the accelerator pump. Take the carb off, take the float bowl off the bottom (4 screws) and you will see the accelerator pump plunger sticking out the bottom, it's just an aluminum rod that drops down into a bore in the bowl. The first thing to check for is that there is a spring between the plunger and the bottom of that bore, nothing difficult at all here.

 

[clower55]

oh ok, i'll have to check it out then, thanks