Hi. I'm about to pull my hair out over my son's quad. I have pulled the carb out 2 times now and cleaned, the first time in the ultrasonic cleaner. Runs perfect without the air box snapped on the carb. When I put on the air box it bogs and dies, if i give it throttle i can barely keep it running but it will not rev up, just bogs. The fuel line is ran directly from the tank to the carb. Oil injection has been removed, running 32:1 mix. Any clue what's wrong with this? Thanks!

 

Welcome to the forums.
It may sound stupid but I'd check the exhaust. I had a Eton in that had the exhaust plugged bad. There is a lil screen that will come out and need cleaned.

 

Thanks for the reply, That would be way to easy! I will check that that tonight when I get home.....

 

No exhaust filter on this one that I can find...just one bolt on the bottom that looks like it doesn't serve any purpose....any one else have any ideas, he really wants to ride tomorrow

 

It's not a filter, the exhaust baffles on a two stroke get choked with carbon, they can often be removed and cleaned. Also the exhaust port can carbon up. Remove the exhaust system and check with a lamp if you can see the piston going up and down past the exhaust port when you turn the engine over. This http://www.dansmc.com/exhaust_2.htm tells you how to de-coke an exhaust but is not encouraging about your chances.

 

Well feel like an idiot.....whoever owned this before me must have pulled the carb for cleaning and lost the pilot jet, it's not in the carb......not sure how I missed this.

 

Can't believe it runs so good without the air box on missing the the pilot jet

 

It's dumping fuel in and w/o the air box there is enough air going in to mix with all that fuel. With the air box on, it restricts the air flow thus not enough air and it chokes out.
Thanks for letting us know.

 

I ended up putting a new carb on it. It runs perfectly with the air box on it now but only for about 5-10 minutes. Then it will idle fine but will bog when you give it throttle. Any ideas? Thanks!

 

Sounds like it is now running weak. The main jet needle is usually adjustable, if you can lift it a notch in the slider, you may find it runs better. Most new Chinese carbs are made to fit a few models so need adjusting to suit the one you have fitted it to.