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2012 RZR another problem

This is a discussion on 2012 RZR another problem within the Engine and Drivetrain forums, part of the Technical category; so every once in awhile my rzr will be hard to start, once it starts it sounds like its only running on one cylinder but ...


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Old April 3rd, 2012, 05:04 PM   #1
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2012 RZR another problem

so every once in awhile my rzr will be hard to start, once it starts it sounds like its only running on one cylinder but its not, i hit the gas and it stalls, then when i try to start it again it whirls over like it has no compression eventually it will start again, after a long period of starting and stalling it will eventually start like nothing is wrong and runs like a champ, i bought it in dec 2012, 17 hours in the cam lobes wore off and polaris rebuilt the motor for no charge, it has about 180 miles on it now havent had any other problems, yes i took the junk champion plugs out and put NGK irdium plugs in it, yes the air filter is clean, no i havent had it in any water or mud, i just trail ride it, any ideas? thanks for your time
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Old April 3rd, 2012, 05:09 PM   #2
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Re: 2012 RZR another problem

the oil pressure regulator pin likes to stick on the 800 get a new one or try to clean it up with some crockus cloth. not sure how to spell it.
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Old April 3rd, 2012, 05:44 PM   #3
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Re: 2012 RZR another problem

ok, where is that located, im not familiar with it.
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Old April 3rd, 2012, 05:50 PM   #4
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Re: 2012 RZR another problem

There is a thread on this about 10 pages deep with the same problem, most on 2012 and 2011 models, when they changed the fuel pump. I think we have it narrowed down to a heat issue with the injectors or a possible ECU programing issue. I'm personally waiting for it to warm up so I can test it again. Also, many think it's ethenol fuel. Try premium and see if that helps.
I will locate the thread and bring it back to the top so watch for it in the active topics.

UPDATE....the thread is 18 pages deep. The topic is "hard to start when warm".
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Old April 9th, 2012, 02:30 PM   #5
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Re: 2012 RZR another problem

So I located this valve where the dowl pin is located, took the cap off took the spring out but can't get the pin out, is it magnetic? Is it brass? Should I crank the motor over and hope the oil pressure just blows the dowl out? and once I get it out is there a "fix" or am I gonna have to do this every 150 miles, this blows, I bought a new one for a reason, thank you all for your input it's very helpful
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Old April 9th, 2012, 02:47 PM   #6
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Re: 2012 RZR another problem

read this topic. sounds exactly what you have going on.


http://www.rzrforums.net/general-rzr...when-warm.html
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Old April 9th, 2012, 04:58 PM   #7
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Re: 2012 RZR another problem

Mine only does it after it sits over night, I never have a problem when it's hot, once I get it started its fine all day, but every morning it seems to take about 20 mins to get it going
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Old April 16th, 2012, 02:21 PM   #8
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Re: 2012 RZR another problem

Ok as a close for this thread, I located the oil pressure relief valve, pulled the dowl pin out and shined it like glass and put it back together, and now my RZR runs like a champ ALL the time. I can't believe something so small can cause such BIG problems and I still can't wrap my head around how it made it do what it did but it's fixed so I hope this thread will help others, and now I'm gonna make a new thread about another problem ha ha thanks everyone
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Old April 18th, 2012, 09:31 PM   #9
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Re: 2012 RZR another problem

how did u get the dowl pin out
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