Change Spark Plug Heat Range?

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  Papa Koley

  2/23/26, 6:35 AM

  Is there a change recommended to the heat range of the spark plugs based on the following?

  I have a '95 VLX 600 dual carb bike that I am installing the TJ Brutal performance carb kit and velocity stacks on and have already removed the baffles from the stock exhaust. Is it necessary/recommended to change the factory heat range setting of the spark plugs? Any actual practical experience(s) would be appreciated. Thanks in advance and keep the rubber side down!

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  Eric Von Zipper New Member

  2/24/26, 9:30 PM

  Changing heat ranges useually has to do with fuel type. 

  E85 needs hotter plugs, 93 octane should not. When I used to race I bought pistons by the case. Would burn quarter sized holes in the center cylinder every other race. But man did we go :-)

  Just fatten up the jets and you should be GTG. 

  Side note, reaming out stock cans is dumb. Buy some cheap cans. Better sound and pressure. Lollypops at least.

  Cop asked me once why I had a 75 taillight on a 69 bike. I told him I got rear ended and went to the junk yard and got a bigger light. In fact the bike was a 75 with an outlaw 69 title :-O

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