Polaro

I had a 98 xc600 and had the same problem right from the beginning. What i did was rejetted the pilots to #45 stock is probably #38, then changed the needle jet to the same one that goes in a 2000 700RMK ask your dealer for info. this solved the problem and ran excellent after.I know this is a big headache but it does work. Before you go and do all this, check the petels on the reed valves to make sure there is not a burnt one. this would cause a air leak and it would backfire.

johnny600

check the safty switch on the throtle
lever. It,s 2 stage.iIf the little switch sticks .The timing will not advance.worked for me.

curd28

I checked the throttle safety switch already, it's fine. I took it out a little bit the other day. It was backfiring even at idle every so often when cold. As I got it warmed up, it ran better and after I had run it about 30 mins, it was not doing it at all. Any ideas?

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1999 Polaris XC 700 SP
1996 Polaris XLT Special

curd28

Oh I forgot to mention, I started it again later that night after it had sat and got cold and it was doing it again.

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1999 Polaris XC 700 SP
1996 Polaris XLT Special

motorholmes

Did you guys come up with more on this? I go along with polaro and may change out the pilots. Mine just barely pops when I cut the throttle, which is no big deal but richer pilots should help that. Also checking to make sure the carbs aren't sucking air around the intake boots or something--

I'm actually on here searching for ignition timing info, but I'll probably sift through the pdf manual I downloaded here (BTW, thanks guys for the free manual) Just feels like the timing is pretty hot on this motor. Anyone goofed around with ignition timing?

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98 Formula Z, 95 Indy 500

motorholmes

Just checked the manual and the 98 xc 600 should have a #45 as stock. Did you buy a high elevation sled? The wierd thing is that the xc 700 shows a #38 pilot...? What's that all about? Is the manual misprinted? And why would the 700 have the same main jet as the 600?

Shows: Jet needle R1368G-3
pilot 45 (600)
pilot 38 (700)
main 185

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98 Formula Z, 95 Indy 500

crocket_5000

wouldn't water in the fuel cause backfiring or partly plugged exaust

downthemiddle

I'm having the same problem with my 98 700XCR. When I start it cold it won't hardly move, it backfires and bogs down real bad. The other day I started it and got it moving and gave it a little more gas and it backfired so bad it raised the hood and split one of the pipes (had to weld it back together) When it warms up it doesn't backfire much but when I'm crusing at low speeds I can hear it poping like it's firing once in a while. I've cleaned the carbs, changed plugs,run prem.gas. All the plugs look the same, not black but pretty dark. It screams at high RPM but not low.

johnny600

the 3 springs that hold the muff to the y pipe have sparkes dancing around them . can"nt find a short Its just Fin strang any thoughs would be great .maybe you have a short some where .i can only see the sparkes in the dark or low light .can"nt see them in the sun light

secretagentbark

i have a 99 700 sks with the same problem any other ideas or things to try cdi/coil ?

gonecheenin

I'm having VERY similiar issues with my '01 XC 500 sled;


http://www.snowmobileforum.com/polar...-off-idle.html



Anyone come up with any solutions yet?

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1988 Polaris Indy 400 - sold
1996 Polaris Indy 500 - sold
01' XC 700 SP - YeeHaw!!!
01' XC 500 - currently having a couple issues.

Bdawg

I have the same problem indicated in this thread, idles at 1500 then Wot it will bog then backfire out f the exhaust. ? I just cleaned the carbs and replace plugs
Any thoughts ?

Bdawg

I think its my reeds, i took the carbs out and cranked it over. air/fuel started spitting back out... I bought some used ones on ebay for cheap so we will see if it fixes it.