hello im new to this form never really posted in the new section to introduce myself (sorry )

so i have a 98 polaris scrambler 400 that i received from a friend, he had it sitting out side uncovered for a couple of years.

when i got it, it had no spark so i cleaned out the magneto and replaced the cdi and now i have spark but it would die when i pushed the throttle

so i cleaned the carburetor with parts cleaner and a air compressor put it back in and the thing doesnt die when i throttle but it'll get to about 1/4 rev and go back to idle then back up to 1/4 like its running out of fuel then gets more.

i then thought it might be something in the exhaust so i took off the pipe and muffler started it to have the same problem...

any suggestions? a shop teacher at my school said something about how i should try adjust the timing but idk were i would do that on a quad

wesley,

 

Check for air leaks and be sure the gas vent line isnt plugged.

 

would the leaks be really noticable? and i just check between the carb and engine?

 

yes check the boot between the carb and the engine, spray starting fluid on the boot and if it raps up, than thats ur problem, also check the crank seals for air leaks, just do the same thing with starting fluid, what did u set ur air fuel screw at?

 

sorry my account decided to not work anymore... i signed up with facebook loggin at first. but anyways im hoiychoiynoiy but on my new account.

the air fuel screw is half turned out from lightly seat
i think i can get the starter fluid on the way home tmrw

when we first got the cdi in and here was spark we didnt have enough gas to go over the straws in the tank so we squirted some in with a windex bottle and it ran good with high rev for however long a straw full of gas lasted... i was thinking that means its just a leak or a bad carb am i right?

 

It might be your air/fuel mixture or your idle is set too low. My KQ 300 did the exact same thing when the idle was set too low.

 

so how would i adjust the idle? is it the screw with the visible spring sticking out of the side of the carb by the air fuel screw?

 

It would be on the side where your throttle cable connects to your carb. It should be the one with the spring visible.

 

ya i did fiddle with that a little revving it while in and revving while 1 turn out and also at 5 or so turns out but didn't have much luck still didnt rev past 1/4

 

i took a video of the rev noise. this is with the quad at full throttle, i had to leave the phone outside because inside the audio was too distorted. maybe this helps

YouTube - 1998 polaris scrambler 400 carborator problems