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Old January 14th, 2010, 08:16 AM   #1
archspring
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waiting for approval on sledding site so will ask here

Sorry for not being 4x4 related. I have the opportunity to purchase a nice Polaris XC 700. I went and test drove it and it is slightly hard starting. Anyway my question is the guy told me he is using oversized spark plugs which take up more space in the cylinder which creates less space for compression which means he said I have to run really high octane to compensate and that is why it is hard starting. I've googled a bunch of stuff and I can't find out anything about these high compression spark plugs. Anybody have any information? I want the snowmobile, but I have to go to the bank to get a loan so I need to make a decision.

Thank You
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Old January 14th, 2010, 08:19 AM   #2
kixx007
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Uh, don't buy it.
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Old January 14th, 2010, 08:20 AM   #3
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I run oversized plugs in my lawnmower so I can get the job done in 1/2 the time.
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Old January 14th, 2010, 08:20 AM   #4
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Uh, don't buy it.
X2
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Old January 14th, 2010, 08:21 AM   #5
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Uh, don't buy it.
X2
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Old January 14th, 2010, 08:22 AM   #6
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are these the plugs where you remove the cylinder head thread the cylinder, and put them in? I hear you get amazing compression with them
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Old January 14th, 2010, 08:24 AM   #7
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Thanks for the replies. Do people use these when the engine is worn out? It only has 4200 miles on it and he said it was rebuilt last summer. I will call him to see if these are threaded into the cylinder.
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Old January 14th, 2010, 08:28 AM   #8
BigBlkYJ 355
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r u serious?
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Old January 14th, 2010, 08:34 AM   #9
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r u serious?
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Old January 14th, 2010, 09:06 AM   #10
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Thanks for the replies. Do people use these when the engine is worn out? It only has 4200 miles on it and he said it was rebuilt last summer. I will call him to see if these are threaded into the cylinder.
I think you might be better off going to a dealer and buying one with a warranty.
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Old January 14th, 2010, 09:14 AM   #11
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lol @ oversized high compression snowmobile spark plugs that make them hard to start. Thats one i've never heard.
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Old January 14th, 2010, 09:18 AM   #12
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lol @ oversized high compression snowmobile spark plugs that make them hard to start. Thats one i've never heard.
I loled also. That thing is probably worn out, or someone F-ed up the "rebuild". I would run away.
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Old January 14th, 2010, 09:18 AM   #13
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HIGH COMPRESSION SPARK PLUGS
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Old January 14th, 2010, 09:19 AM   #14
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its probably hard to start since the plugs are hitting the pistons
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Old January 14th, 2010, 09:21 AM   #15
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Those are just for high octane fuel and are not any bigger in size. They don't cause high compression by reducing cc's in the chambers.
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Old January 14th, 2010, 09:21 AM   #16
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Those are for high compression motors, not for creating a high compression motor.
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Old January 14th, 2010, 09:22 AM   #17
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Im guessing he is running a B8 instead of a B9 NGK plug - which means it burns a little bit hotter IIRC
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Old January 14th, 2010, 09:23 AM   #18
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Quote:
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Those are just for high octane fuel and are not any bigger in size. They don't cause high compression by reducing cc's in the chambers.
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Those are for high compression motors, not for creating a high compression motor.
Well im putting some in my XJ anyway
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Old January 14th, 2010, 09:48 AM   #19
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Im guessing he is running a B8 instead of a B9 NGK plug - which means it burns a little bit hotter IIRC
This is probably true, I would find out if he is running the Champions or the NGK's. Is the head stock or slp? Is the sled one of polaris' test/trial sleds? I have a friend that had and early 2000's 700 xc (extended to 136) that was modded for lack of better terms from polaris that would take 900 t-cats. I have never heard of using a "bigger" plug but I do know that some of the old (70's) ski doo's ran a NGK a or ab plug which was bigger but I thought they were shorter.



edit: I would ask on hardcoresledder or snowest, maybe even johndee.
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Old January 14th, 2010, 09:50 AM   #20
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let me know how they work, the 4.0 in my xj is a bit tired too
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