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Jeff Policky
Jeff Policky, Motorcycle Mechanic
Category: Motorcycle
Satisfied Customers: 2425
Experience:  Yamaha Gold, Suzuki Gold, Honda Bronze, Polaris Bronze, BRP
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I have a 03 700 sportsman i replaced intake carb boot

Customer Question

i have a 03 700 sportsman i replaced intake carb boot between carb &airbox &rs stater upgrade it starts up good win you rve it up backfires if you pull out the coke all the way it will run with out backfire i adjusted air screw from 2.5 turns to 2 its about the same
Submitted: 1 year ago.
Category: Motorcycle
Expert:  Eric replied 1 year ago.


As long as you are sure there are no leaks of air coming in from the intake area, and the airbox and air filter are all in stock configuration. And as long as the exhaust is stock, then it would be safe to assume that the pilot jet in the carb is plugged or has some buildup in it. The problem going away with the choke being pulled out is the biggest clue here. That pilot screw adjustment that your trying should be enough so at this point it would be lacking the fuel from the jet in the carb. its the smallest jet in the carb, you get to it by taking the bottom float bowl off and taking it out with a small screwdriver. run a very fine wire through it to break out any buildup, that with some aresol cleaner will help clean it out well and likely take care of this issue.

Customer: replied 1 year ago.
i will check the pilot jet in the carb but everything from the head back is new there could have been something in the fuel line if this is not it can i get back ahold of you thank you k/n air stock exhaust rm stator upgrade thats it
Customer: replied 1 year ago.
hi Eric help , i check all jets in carb all ok put back on starts right up and idols ok . reve it up and it starts missing and backfiring am i missing someting or doing someting wrong, now hold the choke halfway out and you can reveit up without backfiring
Expert:  Eric replied 1 year ago.

it seems there still may be a lean spot. when did this atv start acting up? at random while still using it daily? or after it has sat unused for a while?

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