1993 Fatboy Running Rough
Grand HDF Member
Joined: May 2008
Posts: 4,329
Likes: 3,626
From: Picayune, Ms.
Ignition Module is $250. I think I'd pull the valve covers first and check there. If the module is bad it should affect both cylinders. Single or Dual fire ignition.
If you decide it is ignition don't forget the trigger in the nose cone. Could just be a loose bolt.
If you decide it is ignition don't forget the trigger in the nose cone. Could just be a loose bolt.
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Novice
Joined: Oct 2009
Posts: 22
Likes: 0
From: Syracuse, NY
Removed the front valve cover to check the springs. I can't tell if there is a broken spring. I also watched the springs while turning the bike over, the only things that I noticed is the front rocker arm would move a few times before the rear one would (2-4 times) before the rear rocker arm on the same cylinder. Also the front spring did not seem as stiff as the rear when moving.
I also noticed but not sure if its suppose to be like this, the pushrods seem to be riding on the walls of the pushrod sleeve
I also noticed but not sure if its suppose to be like this, the pushrods seem to be riding on the walls of the pushrod sleeve
Elite HDF Member
Joined: Sep 2007
Posts: 4,468
Likes: 12
From: Bluffton, South Carolina
Both rocker arms should move an equal number of times per cylinder. It takes an intake and an exhaust to make the engine run. I think you may have missed a few when you were watching.
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Novice
Joined: Oct 2009
Posts: 22
Likes: 0
From: Syracuse, NY
When I was watching the rocker arms, I just turned engine over, and it looked as the front rocker would move twice before the rear would move.
Should I actually let the engine run and then watch them?
Should I actually let the engine run and then watch them?
Stellar HDF Member
Joined: May 2009
Posts: 2,856
Likes: 127
From: Middle of Kansas
No; Do not start it. Just turn it over in the direction it runs. The exhaust valve should open first, then the intake valve right after the exhaust. There may be some overlap where the exhaust is just closing, and the intake just opening. The valves should do this every two revolutions of the crank. If it is not doing it this way, you either have a stuck valve, or there is something wrong in the cam chest.
Road Warrior
Joined: Aug 2008
Posts: 1,306
Likes: 865
From: Sheboygan, WI
Removed the front valve cover to check the springs. I can't tell if there is a broken spring. I also watched the springs while turning the bike over, the only things that I noticed is the front rocker arm would move a few times before the rear one would (2-4 times) before the rear rocker arm on the same cylinder. Also the front spring did not seem as stiff as the rear when moving.
I also noticed but not sure if its suppose to be like this, the pushrods seem to be riding on the walls of the pushrod sleeve
I also noticed but not sure if its suppose to be like this, the pushrods seem to be riding on the walls of the pushrod sleeve
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Novice
Joined: Oct 2009
Posts: 22
Likes: 0
From: Syracuse, NY
The Scoot is Fixed. The issue was actually the lifter, the bearing was shot, and had alot of play in it. Replaced the lifter, and seals, put on about 100 miles and all seems good.
Thanks to everyone for all your help.
Thanks to everyone for all your help.