Does any one know why my 700 twin will run perfect for 30 minutes then start to bog down and finally quit?It will restart but die as soon as you give it the throttle. After it sets for a while fire right up and run for another 20 or 30 min. then same prob.Took it to two diff. polaris stores said it was wiring harness ,replaced same problem next time out.Next shop
said cam or crank sensor month later when i took out same prob.these are 100 plus degree weather im riding in and its extreme rock mountain type terrain at low speeds ,but i dont know anybody have any ideals Thanks.

 

Welcome to the forum! If you have replaced the t bap harness kit and IF electrical is ok,did they check the fuel pressure while it was running? should have 39 psi. Also t bap,tps repair kits are subject to do the same thing again. Plus you might check tank venting for any kinks. Read the "sticky"on problem on repair kits in this section.Sounds like fuel pump, fuel filter,or venting problem from your description.Plus 100 plus temps is tough on pumps,etc. OPT

 

welcome to the forum. it does sound the fuel pump is breaking down when it heats up. not an uncommon issues w/ some of the efi twins.

 

Thanks old polaris tech and stendori i will check and make sure im pulling 39 lbs.i dont think that was checked out at the dealership.

 

Guys i bought me a fuel injection pressure gauge ,with switch on it starts at 40psi and gradually drops to 32lbs.I started it outside the shop in 100 plus temp. and let it idle for 3 hours it steady showed 61lbs on gauge ,i would rev up ever 30 minutes are so stayed solid and never faltered never died ,what do yaw think ? Thanks in advance for your help also the gauge i was using was for a ford i just used a fitting could not find one made just for the polaris.

 

61 pounds?? Either misprint or get the right fitting! Some early efi systems (think on the 500 Ranger was supposed to be 33 psi,can't remember off top of my head?) others were a constant 39 psi. ANY dropping on fuel pressure was almost aways pump related. Never saw near 61 psi!! OPT

 

HAHA, yes it was 61lbs while idiling at 1120rpm ,but with engine off it shows only 32 .

 

As you were running with the gauge on did you bleed the air out,shutting and opening the valve until all air bubbles were out? Just fishin! OPT

 

Only did once mbe i did not get all air i will retry thank you sir.