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  #1  
Old 1 Week Ago
tedcool tedcool is offline
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Join Date: Jul 2020
Location: Central Maine
Posts: 33
Sportster/Buell Model: XLH 1100
Sportster/Buell Year: 87
Other Motorcycle Model: KTM 450 XC-W
Other Motorcycle Year: 2014
Reputation: 10
tedcool is an unknown quantity at this point
Default Runs great - stalls on clutch pull

My son FINALLY got the 87 out for a ride!

Runs great - feels good!

Occasionally stalls when pulling the clutch in when coming to a stop. Won't restart for 10 seconds or so. Then it's fine again! Idle speed seems good - not trying to get it low. I did just set by ear - no tach set up yet...

When I rebuilt the carb I went up 2 sizes on the pilot and MJ ( 60/165 ). Installed a long idle mixture screw and set it as usual and tweaked it for good power. The bike ran good blasting down my long driveway and around the yard.

It was colder tonight than when I did the initial setup. I wonder if the mix was off?

Have any of you had this issue?
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  #2  
Old 1 Week Ago
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Tustan Tustan is offline
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Sportster/Buell Model: XL 1200
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Is your clutch dragging at all (while in gear and clutch is disengaged the bike is still lurching forward)?


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  #3  
Old 1 Week Ago
tedcool tedcool is offline
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Default

Good idea - but no. Clutch works fine - recently adjusted.
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  #4  
Old 1 Week Ago
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Racepres Racepres is offline
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May just be too Fat.. put the stock mainjet back, but leave the Midrange jet you have.
Maybe... but I think either idle too low, and/or, Intake leaks..
Fatter jetting masks intake leaks
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  #5  
Old 1 Week Ago
tedcool tedcool is offline
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Join Date: Jul 2020
Location: Central Maine
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Sportster/Buell Model: XLH 1100
Sportster/Buell Year: 87
Other Motorcycle Model: KTM 450 XC-W
Other Motorcycle Year: 2014
Reputation: 10
tedcool is an unknown quantity at this point
Default

It runs so well until it quits...

I'm wondering if the ignition circuit is unhappy. I did rewire the handlebar switches.

I will bypass everything and wire the circuit directly for testing purposes.

I will test for intake leaks before I head out again - Thanks!
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  #6  
Old 1 Week Ago
tedcool tedcool is offline
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Join Date: Jul 2020
Location: Central Maine
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Sportster/Buell Model: XLH 1100
Sportster/Buell Year: 87
Other Motorcycle Model: KTM 450 XC-W
Other Motorcycle Year: 2014
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tedcool is an unknown quantity at this point
Default

I had an inspiration late last night:

Blocked exhaust!

We swapped the drag pipes for the stock exhaust system that's been sitting in the back of a garage for 20 years, so we could pass state inspection.

When we started the bike, some fluff blew out. Mouse nest sort of stuff. Didn't think much of it. Riding around the yard seemed ok ( I'm in Maine - big yards and long driveways are pretty common ).

I mentioned it to my wife this morning and she said that she had noticed that the exhaust only seemed to be coming from one of the pipes when she watched us the other day. She didn't know if that was normal, so didn't say anything ( she is completely non mechanical). Dang!!!

I think there is at least a partial blockage in one or both mufflers, and running at higher speeds causes a ton of backpressure and kills the engine. Low speed and idling don't show the problem.

The bike was running great on the drag pipes!

So - next step is to pull off the mufflers and blow it all out.
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  #7  
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Tustan Tustan is offline
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Glad you figured it out!


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  #8  
Old 1 Week Ago
tedcool tedcool is offline
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Other Motorcycle Year: 2014
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tedcool is an unknown quantity at this point
Default

Thanks for the kind words - but - I haven't got to it yet.

I hope to find out this weekend.

I feel pretty good about it, though!
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