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Aug 9th, 2007, 02:50 PM
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#1 | | Newbie
Join Date: Aug 2007 Location: York, PA
Posts: 3 Model: 1977 FLH , 1999 FLHT Occupation: Toolmaker
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New member here, hoping for some guidance.
Replaced rear head gasket on 99 FLHT, and bike runs flat. Black smoke at cold start-up using enricher, gas mileage down, and plugs fouling. Replaced plugs, checked ignition wires, even tried another carb, but no change. Did not check ignition coil yet, but do not think the problem is ignition components. Could it be MAP sensor, and if so, how do I check it?
Thanks in advance for any help. | 
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Aug 9th, 2007, 03:14 PM
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#2 | | 200+ posts and climbing
Join Date: Aug 2007 Location: san leandro ca
Posts: 207 Model: 02 fxdx Interests: harley,pool,darts Occupation: maintenance mechanic
| sounds like maybe a vacuum leak. with the motor running carefully spray some wd40 or carb spray on the intake where it connects to the head if the motor changes theres your leak.do it from the primary side good luck | |
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Aug 10th, 2007, 05:42 PM
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#3 | | Newbie
Join Date: Aug 2007 Location: York, PA
Posts: 3 Model: 1977 FLH , 1999 FLHT Occupation: Toolmaker
| Thanks for the input, but I already checked for an intake leak. That was my 1st thought. | |
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Aug 10th, 2007, 06:55 PM
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#4 | | Moderator Has posted 500+
Join Date: Jul 2005
Posts: 4,073
| the engine is definatly over fueling/under airing. check aircleaner?? is enrichiner opening fully?? jets? spark? float level? heat range on plugs? just throwing some stuff out there......have fun!!  | 
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Aug 10th, 2007, 08:08 PM
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#5 | | 200+ posts and climbing
Join Date: Aug 2007 Location: san leandro ca
Posts: 207 Model: 02 fxdx Interests: harley,pool,darts Occupation: maintenance mechanic
| try pumping the throttle once start the bike without the enrichener and use the knob on throttle to run it at a fast idle If you run it for any amount of time with the enrichener out the plugs can easily foul | |
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Aug 11th, 2007, 04:18 PM
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#6 | | Newbie
Join Date: Aug 2007 Location: York, PA
Posts: 3 Model: 1977 FLH , 1999 FLHT Occupation: Toolmaker
| Tried all the standard carburetor and ignition solutions, but still can't get it right.The bike will run without enricher after warm-up, but performance is flat, and gas mileage is down. Will not get full high idle with enricher on (1200-1300 rpm max) and blows a little black smoke. Still think it may be MAP sensor, but don't want to spend $50 if I don't have to. don't have any previous experience with CV carbs, but don't think they can be that much different than old KEHIN.
Thanks for trying. | |
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Aug 11th, 2007, 04:30 PM
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#7 | | Has posted 500+
Join Date: Jul 2006 Location: Churchill County, NV
Posts: 603 Model: '99 FLHR Road King Interests: Ride, Hunt, 4X4, Fish, Cigars - the good things Occupation: U.S. Navy - Retired
| If it wasn't running this way before the head gasket replacement, the odds are INCREDIBLY high that the problem was created during the replacement. Get a good vacuum check on the whole 360 degree head gasket. Check for anything else you may have crunched, gouged or otherwise messed with while accessing the head.
The good Lord knows that I frequently create problems when I "fix" things, you may share in this curse. Good luck! | |
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