93 softtail misfire
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2nd Gear
Joined: Nov 2008
Posts: 6
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From: Plumas Lake, Ca.
93 softtail misfire
Just purchased a 93 softail and inherited a misfire with it. I've checked and repaired as much electrical as I can, r&r'd plugs and wires, and because the bike runs better under load, suspect now it may be carburation. The person I got this bike from bought it as an investment and knew little about it. He suggested that it was a 140 ci, (sounds a bit big). The bike has lots of poop when you get on it, but at lower rpm or when cruising it acts like it has a dead, intermittant miss. Also died on me once at a stop and wouldn't restart. Still had some gas in the tank but pushed it to station anyway and filled up, after which it started. Different issue I think.
It has a screamin eagle ign. module, S&S carb, and what looks like a stock coil [2 inputs,(single fire?)]
I'm down to either a coil or carb adjust, but when I attempted adjusting the carb I just caused a huge backfire. I'm not sure which way to adjust fuel/air on this carb so any help would be appreciated.
I'm a certified master jag tech but from this view you'd never know it!
Thanx in advance.
Intermediate
Joined: Nov 2008
Posts: 39
Likes: 0
From: Plymouth, MA
Every vehicle/brand is different!?!?!?!??
I don't know if this helps or hurts...I am a certified Acura/Honda mastertech who hasn't quite figured out Harley's either. I have a backfire since replacing my exaust and air cleaner and don't seem to be able to get rid of it either. I have also replaced plugs, wires and tried adjustements. Have you figured out your problem yet? My bike seems to run great under load also, which I thought to be ignition as you did???????
Cruiser
Joined: Oct 2007
Posts: 193
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From: Chattanooga, Tennessee
It sounds to me that you have an intake manifold leak. Start the engine and hold it at ab out 1200 rpm idle. Spray brake cleaner or wd 40 where the intake flanges meet the head. If the rpm's pickup and it smoothes out. then bingo and intake leak. Also check where the carb backplate meets the throttle body, there is a seal there that can leak too.
Road Master
Joined: Apr 2008
Posts: 1,195
Likes: 2
From: Denver, Colorado
I don't know if this helps or hurts...I am a certified Acura/Honda mastertech who hasn't quite figured out Harley's either. I have a backfire since replacing my exaust and air cleaner and don't seem to be able to get rid of it either. I have also replaced plugs, wires and tried adjustements. Have you figured out your problem yet? My bike seems to run great under load also, which I thought to be ignition as you did???????
Intermediate
Joined: Nov 2008
Posts: 39
Likes: 0
From: Plymouth, MA
Retune, I am trying but it's cold......
I have replaced the plugs, wires, exaust gasket...twice, played with all the wires and tried to adjust the PCIII all over the basic map adjustments including the cylinder trim making the rear cylinder richer.
The problem I am having is a loud pop(backfire/miss?) about every few revolutions. I can get it to be consistent in neutral after about 1200 rpm sounding like popcorn?? ONLY from the rear cylinder! I have even tried sticking something inside one section of the baffle to help with backpressure. I am getting ready to put it in someone else hands even though I hate to be defeated! I am buying a Factory manual tomorrow!
The problem I am having is a loud pop(backfire/miss?) about every few revolutions. I can get it to be consistent in neutral after about 1200 rpm sounding like popcorn?? ONLY from the rear cylinder! I have even tried sticking something inside one section of the baffle to help with backpressure. I am getting ready to put it in someone else hands even though I hate to be defeated! I am buying a Factory manual tomorrow!
Intermediate
Joined: Nov 2008
Posts: 39
Likes: 0
From: Plymouth, MA
Duh
I have replaced the plugs, wires, exaust gasket...twice, played with all the wires and tried to adjust the PCIII all over the basic map adjustments including the cylinder trim making the rear cylinder richer.
The problem I am having is a loud pop(backfire/miss?) about every few revolutions. I can get it to be consistent in neutral after about 1200 rpm sounding like popcorn?? ONLY from the rear cylinder! I have even tried sticking something inside one section of the baffle to help with backpressure. I am getting ready to put it in someone else hands even though I hate to be defeated! I am buying a Factory manual tomorrow!
The problem I am having is a loud pop(backfire/miss?) about every few revolutions. I can get it to be consistent in neutral after about 1200 rpm sounding like popcorn?? ONLY from the rear cylinder! I have even tried sticking something inside one section of the baffle to help with backpressure. I am getting ready to put it in someone else hands even though I hate to be defeated! I am buying a Factory manual tomorrow!
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