Spark plugs
Road Warrior
Joined: Jun 2013
Posts: 1,781
Likes: 50
From: Louisville, KY
To assess the colour of the plugs you need a good run with the engine at normal operating temperature for some time.
10 mins and a 1 mile ride it could still be on the richer cold start mixture - it it fuel injection, 91 probably not?
Carb float level might be erratic/too high.
Last edited by 1004ron; Jan 16, 2016 at 08:14 PM.
Outstanding HDF Member
Joined: Aug 2012
Posts: 3,217
Likes: 90
From: Detroit
That's no surprise. From your photos, something appears to be seriously off with your fuel/air ratio, or with oil control.
Ultimate HDF Member
Joined: Jul 2014
Posts: 5,649
Likes: 430
From: MASS_hole
the last two looked fine. Front may not have reached same high temp as the back, but they seemed ok for such a short ride. No fouling. Bet if you went for a ripp up the freeway, they'd be spotless.
Couple questions... Are you double checkin the gap and keeping your fingers of the electrodes?
And your ignition wires... When was the last time you changed those?
Couple questions... Are you double checkin the gap and keeping your fingers of the electrodes?
And your ignition wires... When was the last time you changed those?
Outstanding HDF Member
Joined: Aug 2012
Posts: 3,217
Likes: 90
From: Detroit
I've pulled out misfiring plugs that looked a lot cleaner than those.
Road Master
Joined: Nov 2013
Posts: 1,216
Likes: 286
From: Buford, GA
If you're only running it for 10 minutes and driving a mile, the engine is probably not up to normal operating temperature. How long are you leaving the enricher all the way out. Stock air cleaner / exhaust? Have you tried leaning out the idle mixture?
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Road Master
Joined: Apr 2015
Posts: 1,013
Likes: 32
From: Elk Grove, California
The wires are probably 15 years old. Bike has only 4k miles since the motor was built. I am not having any performance issues. The first 2 set smell like unburnt fuel. i have not messed with any of the air fuel mixtures. It have aftermarket air cleaner and pipes.
My biggest problem with the plugs are that i cant start the bike unless i take them out and clean them and reinstall.
My biggest problem with the plugs are that i cant start the bike unless i take them out and clean them and reinstall.
Last edited by sn95bullitt; Jan 17, 2016 at 11:17 AM.
Road Master
Joined: Nov 2013
Posts: 1,216
Likes: 286
From: Buford, GA
Sounds like the plugs are fouled. After you clean them, once you get the bike started, bump the idle up a little and push the enricher in. Let it warm up a little with the idle bumped up and then take it for a good ride to get it up to operating temperature. See if that helps.