Hello I have a 2011 Polaris RMK pro 800 with a high compression head and a fuel tuner. I’m getting a misfire on one cylinder sometimes it will clear out and I can ride all day other times it won’t correct itself. This motor has 60 miles on a fresh rebuild I’ve changed plugs tried different plugs. I’ve turned the oil pump down a full turn and a half still seems to misfire. Tested both coils and noticed one was slightly dimmer than the other I am considering replacing both coils soon and maybe a compression test. Was curious if anyone has any other suggestions. Thanks
Inconsistent misfire Polaris rmk pro 800
- Thread starter Tylerday234
- Start date
Coils are testing 18k with plug caps on and about 12.7 without caps
Leak down test?
what fuel tuner? what is the compression of the head and what elevation do you ride?
It’s a dyno jet power commander 5. A bmp high compression head that tested about 100-110psi on both cylinders cold. Im sitting at almost 8k right now but right about 10-11.5k elevation
Ride*
You could ride it without the controller and see if anything changes. My 13:1 head i ran on my 2012 tested at 128psi. I never ran a controller.
I meant to type 13.5:1 head. Sorry.
So your thinking the fuel controller could be causing my misfire?
It could be. Worth a try to see.
I've had a few PCV cause some weird issues. Defiantly worth a try running it with out. When it starts acting up unplug the pcv and run it. Also when was the last time the fuel filter was changed?
Have not done a fuel filter I was thinking about doing the oil filter as well. And injector worst case
I’ve had 3 Pros; the stator plug has melted on 2 of 3. I just replace them with a 4 wire trailer plug and use the heat shrink solder tubes and they’re good to go!!
My current 2013 Pro that I bought was on its second rebuild; I asked the guy if the fuel filter was changed and he didn’t know. The sled actually sounded muffled when he fired it up.. He dropped the price quite a bit so I reluctantly bought it.. I brought it home and pulled the fuel filer and I could barely blow through it..
I change my fuel filter every year, so I had a good fuel filter sitting on the shelf; I changed it out and the fired it up and the sled sound like it should!! Never had an issue with the engine since!!
The guy actually messaged me the other day and wants to buy it back!!
Gonna cost him a lot more than what he sold it for!!
I change my fuel filter every year, so I had a good fuel filter sitting on the shelf; I changed it out and the fired it up and the sled sound like it should!! Never had an issue with the engine since!!
The guy actually messaged me the other day and wants to buy it back!!
Gonna cost him a lot more than what he sold it for!!
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Here is more food for thought on your fuel filter..
My brother in law has a 2007 Honda 680 Rincon that was bone stock. And he installed a pipe, cam and fuel controller back in the day.
It ran good after the installs but then after a while ran like crap and would always stall when switching from forward to reverse and vice versa..
You could adjust the fuel filer all you wanted to and it would make no difference. He finally got fed up and had the shop put the bike back to stock and it still ran like crap.
The shop could not figure it out so my brother in law searched the net and stumbled up on the fuel filter might be the issue.. He changed the fuel filter himself and the bike never missed a beat after!!
Quads vs sleds but the principle is still the same!!
My brother in law has a 2007 Honda 680 Rincon that was bone stock. And he installed a pipe, cam and fuel controller back in the day.
It ran good after the installs but then after a while ran like crap and would always stall when switching from forward to reverse and vice versa..
You could adjust the fuel filer all you wanted to and it would make no difference. He finally got fed up and had the shop put the bike back to stock and it still ran like crap.
The shop could not figure it out so my brother in law searched the net and stumbled up on the fuel filter might be the issue.. He changed the fuel filter himself and the bike never missed a beat after!!
Quads vs sleds but the principle is still the same!!
Awesome thank you I will order one and give that a shot
My line looked like it had crimps on the filter so I was planning on replacing the whole line but I see the spi is only half the line will that fit on?
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