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I have a 2003 polais 700 twin that runs fine cold but once it heats up it starts cutting out and wont run at all. I replaced the plug wires and plugs and the rubber intake boot with no luck at all. my local dealers won't give me any idea's except to bring it in but I've had two bad experiances with them already (they didn't fix it and it cost a ton and a buddy found the problem and fixed for $20) any ideas would help. Thanks.

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Next time it quits check for spark at plug. this way you can find out if it is an electrical or fuel problem.

Posted on Aug 26, 2010

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I have a polaris ranger 6x6 500cc the plug in it now is a ngk bkr5e 7938. a friend gave me 2 unused ngk b7e s plugs and said that they wood run fine. Are these 2 ngk b7e s ok or what?


The figure 7 represents the heat range of the plug. Usually it is unwise to deviate from specifications unless problems force choosing a different heat range. If the spark plug regularly fouls then a hotter spark plug could improve the problem - with NGK that would mean moving from 5 to 4.

Any move must be made with care to avoid the engine damage possible if the spark plug is too hot.

Hot and cold plugs, incidentally, indicate the amount of heat the spark plug dissipates from the centre to the body and doesn't affect the temperature of the engine. Broadly cool running engines need hot spark plugs and hot running engines need cold plugs so in each case the spark plug nose will achieve the self-cleaning temperature without becoming too heated.

Moving from a 5 heat range to a 7 (NGK) is moving to a colder plug so yes it will run fine, at least for a while, though you could find plug fouling might be a problem...

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