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Bike dies when hot.

Started by tbyte, October 04, 2019, 02:30:00 PM

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tbyte

October 04, 2019, 02:30:00 PM
Bike runs well for about thirty minutes then putters then only idles then dies.  Two hours of sitting and she runs fine again.  Bike ran well all summer up until recently when I had removed tank and carbs to repair throttle.  I did notice a crack in one of the vent lines right before the pod.  Also the hose from the right side of beer can canister behind shock is unattached.  I can’t see where it supposed to attach and could not find it in manual or parts catalog.  Any chance that is the cause?
I had rebuilt the fuel pump last year and replaced most of the fuel lines this past spring.
Suggestions?

ducpainter

#1
October 04, 2019, 02:34:45 PM
I'll bet you $50 bucks you have a kinked/blocked tank vent line.
"Once you accept that a child on the autistic spectrum experiences the world in
a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent.”


tbyte

#2
October 04, 2019, 02:43:12 PM
You mean the hose from tank to charcoal canister box?  It isn't kinked when tank is up and I never gave it a thought.  I will check it.

ducpainter

#3
October 04, 2019, 03:05:31 PM
Quote from: tbyte on October 04, 2019, 02:43:12 PM
You mean the hose from tank to charcoal canister box?  It isn't kinked when tank is up and I never gave it a thought.  I will check it.
Next time the bike stops, open the fuel cap. If you hear a whooshing sound the line, or the tube inside the tank, is kinked or clogged.
"Once you accept that a child on the autistic spectrum experiences the world in
a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent.”


tbyte

#4
October 04, 2019, 04:06:02 PM
Tried that each time it failed, no whoosh and no improvement.  I tried starting with tank vertical, zip.  She would sometimes start but if I opened throttle it would immediately die.

ducpainter

#5
October 04, 2019, 04:12:08 PM
I guess I owe you $50.
"Once you accept that a child on the autistic spectrum experiences the world in
a completely different way than you, you will be open to understand how that
 perspective
    is even more amazing than yours."
    To realize the value of nine  months:
    Ask a mother who gave birth to a stillborn.
"Don't piss off old people The older we get, the less 'Life in Prison' is a deterrent.”


koko64

#6
October 04, 2019, 05:50:29 PM
Does it run with a full tank but fail when the tank is half empty?
2015 Scrambler 800

koko64

#7
October 04, 2019, 06:06:23 PM
Does one cylinder die abruptly and the other stall later?
2015 Scrambler 800

tbyte

#8
October 04, 2019, 06:53:16 PM Last Edit: June 12, 2020, 11:17:28 AM by tbyte
The tank has not been completely filled since before problem started.  I do not think it begins in one cylinder.  The only constant is that it occurred on warm 80+ degree days.  But it might just take longer on a cooler day. 
SOLVED (I think):  I replaced the fuel lines and problem has not recurred. 

Howie

#9
October 04, 2019, 09:38:15 PM
When the bike dies check for how much fuel is in the float bowls.

Drain screw


Also inspect the fuel for contamination.  Not enough fuel?  Bad pump or, if you still have it, vacuum fuel shut off.  Other possibilities are fuel filter, the filter at the carb inlet or the filters in the lines going from the pods to the carbs.

Also, if the bike still does have the fuel vacuum shut off replace it with a manual petcock.

Beer can canister?  One hose goes to the tank, the other just vents to air.  You can get rid of it!
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