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88 fourtrax 300 4x4 starting/carb/throttle issues

2319 Views 11 Replies 4 Participants Last post by  Blueniner9
Hi, this is my second post here, first one over in the intro section...

I’m working on getting my late dad’s fourtrax running. It sat for 12 years. I’ve rebuilt the factory carb. Soaked the carb body, blew out all the passages, installed new jets, replaced the choke cable, new air filter, plugs, and all new fluids (Honda spec’d), drained fuel, new fuel lines filter, battery. I think that’s about it.

Sometimes the quad will start and run absolutely fine. I can drive it around, take it for high speed runs, putt around the yard, let it idle forever. Then some times it starts fine, idles a little goofy, and the bogs down with an insane hesitation if I give it gas.

I have no idea where to go from here. I’ve torn the carb down multiple times and recleaned it, verified the slide diaphragm has no holes in it, but cannot get it to consistently run. Any help is appreciated. This bike means so much to me because of the great memories I have of it with my pop. Thanks in advance!
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What model and year do you have , you mention the fuel enrichment valve ( choke ) might be the wrong one -----if you are dealing with a 300 , then there are two different length plungers from 1st to 2nnd generations ------ another thought did you clean the tank out , maybe pieces of trash/water are making it's way into the carb , or the screen in the tank or the petcock is blocking up and restricting flow
OH , I see now the model and year was in the heading , which I couldn't see with your post , 88 is the short plunger
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