Poor boy tuning
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Stellar HDF Member
Joined: May 2015
Posts: 2,097
Likes: 307
From: mid Michigan
https://www.enginebuildermag.com/202...ur-spark-plug/
Finally found something on tuning by reading cut open plugs
Finally found something on tuning by reading cut open plugs
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,114
Likes: 7,638
From: Poolville
I'm assuming the left is front and right is rear??
Anyways how many miles on this build? The left one is good below approximately 2500 rpm but the midrange is a little rich with wot looking good.. The right plug is s little rich at idle and pretty rich in the midrange and wot.. It would also help to see the threaded part of of the plug with a top and side view of both..
Other than that I'm bet you have a heavy hand..
Anyways how many miles on this build? The left one is good below approximately 2500 rpm but the midrange is a little rich with wot looking good.. The right plug is s little rich at idle and pretty rich in the midrange and wot.. It would also help to see the threaded part of of the plug with a top and side view of both..
Other than that I'm bet you have a heavy hand..
Last edited by 98hotrodfatboy; May 23, 2026 at 06:01 PM.
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Stellar HDF Member
Joined: May 2015
Posts: 2,097
Likes: 307
From: mid Michigan
The left is rear. 40,000 miles on build. I just got tired of a small flat spot I couldn't get enough fuel to get rid of it. I just turned up the fuel pressure on it that changed everything. Almost think I should go carb
Yes like to twist the grip when alone.
I started from scratch on the front and after it looked pretty good on a ride, I did the rear in the same way. Will put some miles on before cutting open plugs again. Will included threads next, but they looked good heat range and timing looked ok, but looking at old plugs showing I could advance a cylinder some but not sure which one was what. So need to wait to get a good strap reading.
Yes like to twist the grip when alone.
I started from scratch on the front and after it looked pretty good on a ride, I did the rear in the same way. Will put some miles on before cutting open plugs again. Will included threads next, but they looked good heat range and timing looked ok, but looking at old plugs showing I could advance a cylinder some but not sure which one was what. So need to wait to get a good strap reading.
Last edited by xcbullet; May 24, 2026 at 11:46 AM.
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