2004 Street Pro S&S twin v 124. Baker 6 speed
Looking for diagnosis of the burn on my S&S124. Front and rear cylinders look the same. About 600 miles on these. 10k miles on engine
No octane booster, normal riding and she runs great. Some additional info. I had an intake leak, not sure for how long and I replaced the manifold so while it was off I took some pics of the intake ports and saw what appears to be carbon build up. I was going to pull the heads but got lazy and put her back together. Any thoughts? She doesn’t blow any black smoke but the pipes were pretty sooty when I replaced the exhaust gaskets while I had the tank off and waiting for intake.Hard to tell from pictures on the internet. But they look too black for my taste.
Are you reading these plugs after a high-speed blast, where you cut the motor while you are on it. Or is this after normal putting around town?
And are you using any octane booster, or maybe some other fuel additive? I remember some posts about this a while back.
I might be guilty of just short runs and my last battery issue caused me to limp home at idle speed for about 8 miles. Going to do a compression test this week to eliminate any issues there.Looks bad fat to me. But that can just be from lots of cold starts and idling. Not getting run long or hard enough to let them burn clean.
Thanks I will check the mixing screw to verify, I’ve never done a compression test so I will, to eliminate anything there. I did want to mention the carb also has a thunder jet but I don’t think that should be a factor here. I did just switch to non- ethanol 93 fuel but haven’t even burned a tank of that yet. Thanks again for all your guidance gentlemen.I go with what thermodyne says,,,, how far out is the air fuel mix screw? If it is less than 1.5 out,, the low jet is too large,, if it is closer to 1.75-2 turns out it is too lean... however your jetting is in the range a 124 runs best with... so,, I would drop the low speed jet 1 size to 35, and increase the air bleed to 210-220. This will bring the main in later
I did see that. Very informative, so I was looking for some guidance on this forum for the possible remedy for me.On Youtube Kevin Baxter of Baxters Garage has a video wherein he diagnoses sparkplug color and color location. It’s an in-depth review and very much worth watching. Should be very helpful to you with your situation.