polaris predator 500 cam timing diagram

pink63impala · #1 (**permalink**) 05-04-2011, 08:29 AM

have a 05 predator 500 working on. fella brought it to me cause it wasnt running. it had a tight exhaust valve. had valves adjusted, drained fuel and put fresh 93 in it. took carb off and cleaned it. changed battery. plug looked new. cant get it to fire up. tried pushing and pulling it with my other 4 wheeler, but it wont bust off. gonna try one more new plug but after that i dont know. has 150 psi on compression now. plug is firing,cant tell if its weak though.. any help apreciated.

**Bruce!** · #2 (**permalink**) 05-04-2011, 12:59 PM

Welcome to the board!

pink63impala · #3 (**permalink**) 05-04-2011, 02:21 PM

Put new plug in. Tried spraying some starting fluid in the carb.it backfired but no start.about to take 10lb hammer to it....

joshr08 · #4 (**permalink**) 05-04-2011, 02:43 PM

who did the valve shim adjustment?
are you sure timings on now? how were the intake valves? usually those are the ones that need the most attention. when you pulled the plug was it dry or wet? if dry then your not getting gas with a backfire out the carb i would guess your timing is off and if the timing is off i would guess its not looking good for your valves. i would pull your plug on the mag side put the T in the little notch and pull the valve cover and check your timing marks. i wouldnt try cranking on it until you make sure timing is on 1 tooth will crush a valve into a piston and toast a head.

pink63impala · #5 (**permalink**) 05-04-2011, 02:50 PM

Quote:

Originally Posted by joshr08

who did the valve shim adjustment?
are you sure timings on now? how were the intake valves? usually those are the ones that need the most attention. when you pulled the plug was it dry or wet? if dry then your not getting gas with a backfire out the carb i would guess your timing is off and if the timing is off i would guess its not looking good for your valves. i would pull your plug on the mag side put the T in the little notch and pull the valve cover and check your timing marks. i wouldnt try cranking on it until you make sure timing is on 1 tooth will crush a valve into a piston and toast a head.

Ok I'm looking at the timing.and at another thread on here..I have the timing mark to the left of the t lined up,on the notch.my intake or rear cam marks looking at the quad from the right side are at 12 and 9. The exhaust is at 12 and 3.and looks like the lobe is opening the exhaust valves.from what I read on the other timing thread the lobes should be facing outwards and are both came supposed to be at 12 and 9 ?

pink63impala · #6 (**permalink**) 05-04-2011, 02:56 PM

i had the local race shop owner adjust the valves for me. i checked them before i took it there one of the exhaust valves had about half thou. clearance. the rest were in spec .004-.008 and .008 - .012

joshr08 · #7 (**permalink**) 05-04-2011, 03:03 PM

ok your timing is off. you need to be on the T mark not the line next to the T. then front the right side of the quad(or clutch cover side) intake will be at 9 and 12 and exhaust should be 1 tooth above 9 and one tooth past 12 if the marks are at 9-12 on intake and 12-3 on exhaust your timing is off and prolly have a bent valve now. i am looking for the picture to show how it all lines up as soon as i find it ill post it up for you

LEOGM5150 · #8 (**permalink**) 05-04-2011, 03:14 PM

here is what you cam timing should look like

joshr08 · #9 (**permalink**) 05-04-2011, 03:17 PM

thanks leo i knew you would be faster at posting them since i was going to steal your pics anyways...lol between you and me we are going to get these predators all straightened out then we wont be needed anymore. maybe we should keep one little secret so they dont know everything.