Just wanted to know, which plug was the hotest out of the two. this is my first plug change. Thanks for the help.

 

The heat range of a plug only denotes how much heat is transferred to the head. The length of the insulator determines this. The spark is not any hotter, or colder. for further info look at ngk.com In my humble opinion, unless you have done some major engine work, and know how heat ranges effect operation, you should stick with the stock plug.

 

The higher the number the cooler the plug with NGK's. An 8 is cooler than a 7. For example if you run nitrous, you should consider a cooler plug range and/or closing the spark gap down to .020".

Ken

 

Will I be ok with 6's with the mods I have? I am jeted 138f and 142r. Thank you for your help.

 

Why would you want to run a hotter plug? Just curious.

Ken

 

Heres some info on spark plugs,
spark plugs

 

What will your quad run topend on the spray? The best I have got out of mine, stock engine, is 70 mph in a 1000ft. can I get more without any engine mods?

 

76.3 in less than a 1/4 mile, 70 in the same distance without the spray, and thats not hitting the spray until 60. Could be quicker with sooner hits of spray. Our temps are very high now, so when I did my testing last weekend, it was not as good as could have been. See the Nitrous thread on kawieriders. com for more info. Later.

 

If you want to run a little richer, than consider a hotter plug to keep it from fouling, but then you have a higher risk of predetonation. Unless you have a problem with fouling plugs, there's no point doing anything with the plug you've got.