Starting issues '99 FLHT
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6th Gear
Joined: Jul 2011
Posts: 13
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From: Jacksonville, FL
Starting issues '99 FLHT
I have a '99 FLHT (carb'd) and it has developed a nasty backfire (through the carbeureter) while starting the bike. Once I get the bike running it runs great, from idle to WOT and if I shut it off, it will start right back up if it's still warm but it really is hard to get her started. I'm guessing it may be a problem with the enrichment circuit in the carb but I would like to know if I'm missing something before I tear the carb apart.
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Joined: Sep 2008
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I had a 99 FLHT and I loved that bike. Mine would always crank if pulled out the enricher and let it idle for 3 to 4 minutes. If it started to spit and sputter when taking off I knew it was time to clean out the jet or replace the jet. This might be your problem. Wouldn't hurt to take a look.
http://www.youtube.com/watch?v=Deh7UqqkbKc
http://www.youtube.com/watch?v=m0sZ3...eature=related
http://www.youtube.com/watch?v=Deh7UqqkbKc
http://www.youtube.com/watch?v=m0sZ3...eature=related
Last edited by zoozoo; May 23, 2012 at 08:16 PM.
Extreme HDF Member
Joined: Sep 2010
Posts: 14,744
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From: Phoenix '53, '88, '09 Big Twins
there is a hose fitting on top of the intake for a switch ( voes) , make sure the hose is connected at both ends and is not cracked or split- if you have a vacuum pump, check and see that the switch will hold 10 PSI
check for intake leaks at the heads.
while the bike is idling, spray wd40 through the red straw at each of the intake manifold/head joints- if the idle changes then you have found the location of the leak.
if the plug over the idle mixture sctrew has been removed, make sure that the idle mixture screw has not fallen out.
this problem would not indicate a fault or clog with the main jet
mike
check for intake leaks at the heads.
while the bike is idling, spray wd40 through the red straw at each of the intake manifold/head joints- if the idle changes then you have found the location of the leak.
if the plug over the idle mixture sctrew has been removed, make sure that the idle mixture screw has not fallen out.
this problem would not indicate a fault or clog with the main jet
mike
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6th Gear
Joined: Jul 2011
Posts: 13
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From: Jacksonville, FL
Thanks for all the help guys I really do appreiate it. I'll pull the tank off tomorrow and check the VOES hose and hook up the mightyvac to the switch, and then it's on to the carb I guess. I was going to try the wd-40 intake leak check but I only got her fired up once I cant get her to fire up again. The crazy thing is that the one time I got her running since this started it ran normal, from idle to WOT, I even rode it down the street and back with no issues. So that leads me to believe it's not an intake leak. The accelerator pump is working and the slide works as it should when the bike was running on the stand. I shut it off and it cranked right back up. But when I let it sit for the night, no joy.
I also pulled the plugs and they looked good and the spark looks fine when cranked over as well.
I got 3 weeks to get some riding in before I deploy again so I'll keep crackin' and keep ya'll posted. The videos were a big help too, thanks again.
I also pulled the plugs and they looked good and the spark looks fine when cranked over as well.
I got 3 weeks to get some riding in before I deploy again so I'll keep crackin' and keep ya'll posted. The videos were a big help too, thanks again.
Last edited by jason8251; May 23, 2012 at 08:48 PM. Reason: more detail
Extreme HDF Member
Joined: Sep 2010
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From: Phoenix '53, '88, '09 Big Twins
ok you have a mity vac- good.
try this first
the stock petcock has a vacuum line on it.
attach the mity vac and apply 5 psi or so to the petcock.
that opens the petcock and will allow fuel to flow to the float bowl.
this lets us know that there is fuel available when you first start cranking the cold motor.
any change ?
if it fires right up, this may tell us that when you are first cranking a cold motor, the float bowl is empty.
mike
try this first
the stock petcock has a vacuum line on it.
attach the mity vac and apply 5 psi or so to the petcock.
that opens the petcock and will allow fuel to flow to the float bowl.
this lets us know that there is fuel available when you first start cranking the cold motor.
any change ?
if it fires right up, this may tell us that when you are first cranking a cold motor, the float bowl is empty.
mike
Last edited by mkguitar; May 23, 2012 at 09:11 PM.
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6th Gear
Joined: Jul 2011
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From: Jacksonville, FL
No vacuum hose Mike, running a Pingel petcock to a SE 44mm (Keihin I think) HD part# 27932-99 is on the carb. I know there is fuel available when cold because the accelerator pump will squirt fuel when I twist the throttle before I try to crank it.
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Club Member
Joined: Jun 2007
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From: Bedford UK
VOES = vacuum operated electronic switch. It is a pretty insignificant looking plastic thing that serves to alter ignition timing while riding. If it is disconnected, or the plastic hose is split, it can really mess up the engine, until you get up to a decent steady speed, when all seems fine until slowing down again!
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