what is the compression on a 350 polaris 2 stroke 2000 model

Roc5950 · #1 (**permalink**) 01-26-2012, 03:24 PM

I have a 91 350L 4x4 that runs great for about a 100yds and then starts to bog. Hold the throttle, it will bog and die as if it is out of gas. If you let off it idles fine. Idle around for a couple of minutes, throttle up again for about another 100yds, bogs down. It always starts right up and will go on all day at idle speed, never missing a lick. The following is what I have done:
Gone through the carb, new needle and seat, all passages clear,clean, flowing
Verified air flow to carb (ran without air box), Good suction & no blow back
New reed cage boot and gaskets, New Spark Plug (old plug looked good) Spark is good and blue, Compression checked 110psi, All vents clear
Verified sufficient fuel flow with now restrictions (used external source)
Verified the the exhaust is not restricted (ran w/o exhaust)
Verified the the speed limit switch is operating properly

For that 100yds, it is a beast and then booooooooog. I am stumped.
Anyone had this issue? Any ideas? Any help is appreciated. Thanks

**Bruce!** · #2 (**permalink**) 01-26-2012, 04:35 PM

Welcome to the board!

Sounds indeed like its running out of fuel!

Russ C · #3 (**permalink**) 01-26-2012, 04:38 PM

did you check vent off of gas tank? under plastic in front of gas cap, try looseningcap and see if it runs

Roc5950 · #4 (**permalink**) 01-27-2012, 02:37 AM

Thanks for the replies and glad to be on the baord. Thought we had checked that vent, but will check it again this week end and get back with the results. Thanks again for the input. Roc5950

5hundredpolaris · #5 (**permalink**) 01-28-2012, 07:02 PM

mine does it too. OCCASIONALLY. whenever it does it, i have to hold down the reverse overide button. which SUCKSS. sometimes i only have to hold it for about 30 seconds. yesterday, i had to hold it the whole ride!! broken thumbbb. someone helpp

Roc5950 · #6 (**permalink**) 01-30-2012, 02:46 AM

Thanks for the input. Didn't have time this weekend to check out the tank vent again. Will try the reverse switch too when I get back to it. Hopefully this week sometime. Roc5950

Roc5950 · #7 (**permalink**) 02-08-2012, 03:08 AM

Sorry for the delay getting back. Work took me out of town. Checked the tank vent and even ran it will an auxilary tank, no change, still bogging. Tried holding reverse switch,same results. Recheck the ignition, readings are close to the book but a little off, example: book says .o ohm, mine is .5, figured it was my meter. Fire is blue and strong, will jump a 3/8 gap at idle. Any new ideas would be appreciated. Thanks Roc5950

Russ C · #8 (**permalink**) 02-08-2012, 03:22 AM

fuel pump?

Roc5950 · #9 (**permalink**) 02-08-2012, 05:19 AM

Thanks for the input but this one is gravity feed.

4getful2 · #10 (**permalink**) 02-08-2012, 11:09 AM

And you do have the vent hoses hooked up proper,and they are clear?
Check the needle ,that goes into the main jet,to see if the c-clip didn't fall off.
Check coil wire resistance and plug cap,especially cap
You've ran this thing without the air filter housing,did it sound like it was shutting off(spark) or did it sound like it was wanting more ,but you didn't have anymore to give it (fuel)
Check for broken motor mounts and proper clutch operation