Stalling while rolling to a stop???

[Moespeeds]

I put a new EHC and Dyna 2000i in a 2004 Chopper. Since the change, the guy has had problems with the bike stalling while rolling to a stop. Idle seemed a little low so I raised it up and set air/mixture screw. Tried advancing the timing a hair, no difference. Checked for intake leaks. It seems to happen when the bike gets hot, and it's totally random, might not do it all day, then he might stall 4 times in 10 miles. Only when sitting at idle or rolling to a stop. I rode the bike and couldn't repeat the problem, jetting seems good, possibly a little on the rich side. I did see the bike stall once when we were riding together, and it seemed to cough out the carb and stall. Starts right back up with no problem. I'm gonna try checking the jetting a little closer, but what else could it be?

 

[BadBrad]

Does he have an inline filter? Could be clogged and when not throttled, may not have enough fuel passing. Also, have you checked for any other type fuel restriction like the tank liner separating and plugging the petcock filter? My guess is there is a restriction somewhere in the fuel line/filters.

 

[Moespeeds]

If there was a restriction, wouldn't the issue be more pronounced on hard acceleration, when fuel demand is maxed? The carb doesn't suck gas, no matter how hard you hit the throttle, flow is fixed based on gravity feed, right? I took the bike for a day and wrung it out, no problems. My next step is to check the petcock, but at idle it's barely sipping gas.

 

[V]

Heat affecting the igntion or a electrical component?
When the bike stalls do any gauges act up or lose power?
Fuel is on gravity, float problem?

 

[Moespeeds]

No power loss, seems to be fuel related. What if his intermediate jet was too rich or too lean?

 

[woodbutcher]

could the clutch be dragging enough to cause it to bog down?

 

[Moespeeds]

Bike runs great other than this random stalling. It all started with the ignition and ehc change, that's why I tried advancing the ignition.

 

[Vegas]

Check the float level. The heat may be causing the fuel to percolate and fatten up the intake charge.

 

[Throttle Jockey]

I know it sounds to be fuel related but how old is the battery? and is everything tight?

TJ

 

[Five Five]

I'm thinking electrical.....regarding the ignition system.....all connections good ?

 

[Moespeeds]

No connections to make, the dyna is soldered in. checked coils, which are brand new. it only stalls when rolling to a stop, or while idling, coughs out the carb and always starts right back up with out a hitch. Its driving me nuts.

 

[Dozer1]

Besides potential restriction issues, has me kinda baffled too! :bang: First check in-line filter, if has one; then pull petcock and check tank filter; and then, if all else fails, check float. Def sounds like restriction issue! Sounds like she's runnin rich as hell!

 

[2004BC]

Not that this is the answer to your situation but generally coughing, if I understand your description correctly, out the carb at idle is a too lean idle circuit air/fuel mixture adjustment. Can you enrichen that and see if there is an improvement? I'm assuming you don't have any coughing out the carb from off idle up to WOT. As said above if coughing means gas puddling in the carb throat and spitting gas out the venturi then too rich. Advice subject to interpretation!!!

 

[Moespeeds]

I tried initially to richen the idle circuit but I'll try goin way rich and see what happens. Thanks!

 

[Chopper117]

No connections to make, the dyna is soldered in. checked coils, which are brand new. it only stalls when rolling to a stop, or while idling, coughs out the carb and always starts right back up with out a hitch. Its driving me nuts.

Sounds like mixture screw needs to be played around with if thats not it I would look into the Int. Jet. I would go up a size and go from there.

 

[Five Five]

No connections to make, the dyna is soldered in. checked coils, which are brand new. it only stalls when rolling to a stop, or while idling, coughs out the carb and always starts right back up with out a hitch. Its driving me nuts.

So with that said "spark" is definately ruled out.....back to the carb.....I would focus on the 3-circuts to the carb.

1) accelerator pump...it seems to be working, no hesitation from a roll off.
2) Main jet....It seems to be working, you have power as you bang through the gears no lack of fuel,
3) Idle metering circut, stalls when rolling to a stop or idling...
possible causes...
a) worn idle / mixture screw ?
b) intermittent obstruction idle circut/fuel passage (debris) ?
c) float bowl venting ???

in regards to your question about Jetting... it's been my experience to encounter lack of performance....wont hold a steady speed without breaking up....spark plugs loaded up.....etc. But never a stalling issue.

just tossin a few ideas out there :2thumbs:

 

[BadBrad]

Kind of like what Bill55 was mentioning, have you pulled your plugs and checked for fouling? Could cause stalling with low fuel supply.

 

[Moespeeds]

Plugs looked good, very slightly on the rich side. I'm gonna give that mixture a half turn out, and change the plugs and see what happens. Thanks guys!

 

[Five Five]

Plugs looked good, very slightly on the rich side. I'm gonna give that mixture a half turn out, and change the plugs and see what happens. Thanks guys!

Moe....keep us posted on this.... I hope to learn something from it.
one more thing I wanted to ask...how are the plug wires ?

 

[CHOPPED]

Mine does this every once in a while. I just figured it was hot. Correct me if I'm wrong, but mine is efi so it should adjust the mixture. Mine will also kind of backfire out of the intake every once in a while when I go to start it. Curious to see if there is a way to stop it.