Ken dog

I have a 2003 Polaris 500 liquid cooled classic touring sled. The other day we were on a long flat trail. After we stopped it was hard to start then we had poor power 25 mph. Found that the right cylinder plug was black. Removed head and piston ok just black, carb was clean. We put a loose plug in wire and when running that plug was firing. It appears that the right cylinder is not firing properly wet with fuel but no power, new plugs ect no help. HELP

kccats

Did you do a compression test? @WOT!

rgoers

Yep, probably low compression on that side...

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2004 Polaris Trail RMK 136
1997 Ski Doo Summit 500
2000 Arctic Cat ZL550 ESR (in NY)
2000 Arctic Cat 440 Panther (sold)
1980 Arctic Cat Jag 3000 F/C (in NY)

"If it ain't broke, take it apart and find out why!"

Josh Kidner

Out of curiosity what is the difference between compression test @wide open throttle compared to idle throttle?

smallengineguy

Pulls the full amount of air into the cylinder to compensate for low RPM's.

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Josh Kidner

I see... More air = more psi. Same as doing it without carbs on. Thanks¡
!

Ken dog

Hi kc

We did not do a compression test yet but did notice light scuffing in the cylinder. The crank seals do not show any signs of leaking. Engine had complete professional rebuild 2 years ago (out of warranty) I held my finger over the spark plug hole and cranked it over, it showed some compression. Took carbs down and found a small white flake in the needle and seat on the bad side. I will be reassembling soon to try it out.

kccats

While you have the carbs apart pull the pilot gets out and clean them!