HMF exhaust
Oct 12, 2012 | 04:12 PM
#4
Pro Rider
Joined: May 2011
Posts: 955
Likes: 0
From: Redneck Capital of the World
Its a guessing game,
Pull your plug
Optimal - White or no color change with light gray ring
Lean - Extreme white with aluminum specs (overheating)
Rich - Wet or sooty
someone else ought to know more than i do 
Pull your plug
Optimal - White or no color change with light gray ring
Lean - Extreme white with aluminum specs (overheating)
Rich - Wet or sooty
Oct 13, 2012 | 07:57 AM
#5
Extreme Pro Rider
Knows Old ATV Questions!
Knows Old ATV Questions!
Joined: Sep 2003
Posts: 5,127
Likes: 3
From stock to a slip on only, you can usually get away with going one or two sizes up on the main and possibly plus one size on the pilot. That is if it was already correctly jetted before the exhaust.
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