New Fatboy runs crappy
Seasoned HDF Member
Joined: Oct 2012
Posts: 13,092
Likes: 13,022
From: Texas, USA
I was referring to your assessment of the "Harley mystique". not HD motorcycles.
The best approach is to diagnose the problem first and then replace parts. Indiscriminate replacement of parts usually wastes money. Have patience. The problem will get fixed and then you can enjoy your Fatboy.
the Harley mystique got me but Im now not sure
Club Member
Joined: Aug 2008
Posts: 22,855
Likes: 17,906
From: Lafayette, Louisiana
One of the things that stands out to me is two coils are mentioned multiple times. Elaborate on that.
Are you running single or dual fire ignition?
Post a picture of the bike and post a picture of these coils on the bike.
Are you running single or dual fire ignition?
Post a picture of the bike and post a picture of these coils on the bike.
Last edited by Prot; Jul 4, 2018 at 11:41 PM.
Thread Starter
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Novice
Joined: May 2018
Posts: 15
Likes: 0
From: Jupiter Florida
Its a single fire set up two Dyna 5 ohm Dyna S with that SE box wired in .
im gonna try and disconnect the SE box,if it does it again Ill trace all wire continuity when its hot see whats not happening right.
i heard the ignition modules can melt moving the air gap
btw its on the rear cylinder that this all occurs
im gonna try and disconnect the SE box,if it does it again Ill trace all wire continuity when its hot see whats not happening right.
i heard the ignition modules can melt moving the air gap
btw its on the rear cylinder that this all occurs
Thread Starter
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Novice
Joined: May 2018
Posts: 15
Likes: 0
From: Jupiter Florida
R rear still misfiring when hot
ok I went through checked the Dyna S making sure the switches working on the off,checked make sure airgap specced out ,new 5.0 single fire Dyna coils, I found lil Allen screws that hold the ignition triggers a bit loose thought maybe it,adjusted the accelerator screw 2 out from stop it was 3 thought maybe to rich was it. Then test ride after it all after about 1/2 hr operating temp R rear craps out runs on 1 cylinder Im pretty frustrated I just bought it and cant even ride it.
anyway any additional ideas welcome on this Harley POS
anyway any additional ideas welcome on this Harley POS
Tourer
Joined: Mar 2010
Posts: 276
Likes: 1
I had a 98 fat boy loved it, never really had much of a problem. I replaced the stock cv carb with a mikuni, after it was started running rough. Iit took me a couple of attempts to get a jetted right but once I got to ride it ran great. I think what you're describing could be your carb jetted incorrectly or possibly some electrical problems I would suggest you take it to the mechanic you trust who's familiar with Harleys and see if you can exclude an electrical problem if it doesn't appear to be electrical it's most likely you need to rejet your carburetor. Electrical problems can be a b**** to diagnose so take it to somebody who knows what they're doing Evo Harleys are almost Bulletproof don't get discouraged all motorcycles have problems hang in there
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Thread Starter
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Novice
Joined: May 2018
Posts: 15
Likes: 0
From: Jupiter Florida
Thanks it runs great until it gets really hot then R rear cylinder runs a weak spark when it cools down its back to normal so I know its electrical but havent been able to nail it .If wasnt intermittently doing it It would be fixed by now.
Only explanatory fix is to get it to do it then try the diagnosis .
safe riding
Only explanatory fix is to get it to do it then try the diagnosis .
safe riding
Last edited by Bcum1; Jul 22, 2018 at 09:27 AM.
Road Warrior
Joined: Sep 2006
Posts: 1,570
Likes: 45
I really think its the cam sensor in the nose cone. When those go
bad they tend to act funny when the bike gets hot. Its
cheap and easy to replace. I did this on my old evo.
bad they tend to act funny when the bike gets hot. Its
cheap and easy to replace. I did this on my old evo.
Last edited by the blob; Jul 22, 2018 at 03:12 PM.