Question about Harley Davidson Harley-Davidson Motorcycle Desktop Telephone

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Older harley when I go over 40mph my bike back fires and misses then I drop under 40mph it runes ok

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Sounds like a lean condition. check for plugged carb passages and jets

Posted on Aug 13, 2008

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  • 97 Answers

At what throttle position? check basics first , spark plugs air filter fuel filter and plug wires

Posted on Jul 21, 2008

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Miss fire after up to temp and runfor short amount of time. I get a miss fire coming to a stop..drops to cylinders or 1. will not accelerate at all boggs with miss fire.


Check your tank vent. Ride the bike until it stalls, pull over and pop open the gas tank lid. If you hear a "ffffwwwwwah" of air being sucked in when you open the tank, your air vent is blocked. The bike runs great when you start out, but as fuel is taken out of the tank no air can get in to replace it and the tank develops a vacuum.

Jan 14, 2015 | 2000 Yamaha V-Max

1 Answer

Just had a screamin eagle race tuner installed and dyno driving bike at 40mph down road and then it shuts off , can fire back up but have to keep giving it throttle, then all the sudden its fine, replaced...


Hi Carolb656, and the usual suspects are:
1. Severely discharged or damaged battery.
2. Loose, corroded or broken battery cable.
3. Alternator not charging or below normal rates.
4. Failed ignition coil, ignition/electronic module.
5. Failed CKP, CPS, CMP, MAP, TPS, or BAS sensor.
6. Faulty ignition switch.
7. Water or dirt in fuel system, carburetor or filter.
8. Fuel tank vent system plugged or gas cap not venting.
9. Fuel tank empty.
10. Fuel valve vacuum line broken or carburator vent line closed off.
11. Restricted, blocked or kinked fuel line.
12. Failed fuel pump, pressure regulator and or fuel injectors.
For a prime suspect please visit website below and good luck:
Big Twin Carb EFI DTC Intructions codes Harley Davidson Forums Harley...

Sep 12, 2010 | 2003 Harley Davidson FLSTF Fat boy

1 Answer

The bike is a 06 streetglide when you throttle the bike under load the oil pressure drops what would be the cause


I don't know too much about the oil pumps in the Twin Cam engines. I have never worked with one of them but I've got extensive experience with the older type pump used on the Shovelheads and Evolution engines.

A Harley engine employs a high volume low pressure oiling system. The old Shovelheads would actually show no oil pressure when idling hot with most gauges. The oil pressure switch would cut the light off at four pounds of oil pressure. A Harley engine will not hold a lot of oil pressure because the engine is built using roller bearings instead of shell bearings.

As long as the tappets are not rattling, you don't have a problem with oil pressure. If your oil pressure drops too low, the tappets are hydraulic and they will rattle like hell. There will be no doubt in your mind as to the problem.

Now, back to your question as to why the oil pressure on your bike drops when accelerating under a load, I have no idea.

Good Luck!
Steve

May 18, 2010 | 2008 Harley Davidson FLHX Street Glide

1 Answer

LINCOLN 225 WELDER OLDER MODEL ABOUT 1985. 16HPENGINE. AFTER GETTING GOOD AND WARMED UP IT STARTS MISSING SOMETIMES BACK FIRES EVENTUALLY DIES. REPLACED COIL REBUILT CARB ,NEW FUEL FILTER AND LINES....


check plug and wire. you will want to do a compression test while you have the spark plug out and make sure you have no blow-by that will cause it to miss.

Oct 08, 2009 | Welding Tools

1 Answer

My bike was runing good it,s a94 fatboy the other


Sounds like your voltage regulator is bad or come unplugged

May 09, 2009 | Harley Davidson Harley-Davidson Motorcycle...

1 Answer

Miss firing


There could be several casues. Vacuum leak, especially at the manifold, bad/fouled plugs or wires, water or dirt in the fuel system and even a low battery can cause misses. I would try spraying a little starting fluid on the manifold seals to see if your engine speeds up. If it does, its the seals

Dec 26, 2008 | 2000 Harley Davidson FLHTCUI Electra Glide...

1 Answer

Bike Won't Fire


Timing is off. If the timing isn't exactly right it will turn over until the battery goes dead or the starter burns up (which ever comes first). The fuel/air mixture has to be ignited, expelled from the engine,etc. for the bike to run.

Nov 22, 2008 | Harley Davidson Harley-Davidson Motorcycle...

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