Stalling in HOT conditions

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gjr

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You have all been there - trickling along in stop and go traffic on a hot day and at a light the bike hicups and dies. A quick kick will not bring it back to life. I have to tickle the carbs to start mine. After the restart the bike runs fine. Other than hating being stuck behind a line of Lexi and minivans, what exactly is happening ? Boiled fuel ? Totally messed up mixture ?

Thanks

Greg
 
what does your bike normally idle at when the motor is warmed up, Greg?

and what are your Amal air screws set at, turned out from fully seated now?
 
gjr said:
You have all been there - trickling along in stop and go traffic on a hot day and at a light the bike hicups and dies. A quick kick will not bring it back to life. I have to tickle the carbs to start mine. After the restart the bike runs fine. Other than hating being stuck behind a line of Lexi and minivans, what exactly is happening ? Boiled fuel ? Totally messed up mixture ?

Thanks

Greg
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Since you have to tickle the carbs to get it to restart -then it is very likely that the fuel is boiling.

Make sure your fuel lines are as far away from the barrel as you can get them.
Remove any inline fuel filters.
Use thick insulator type gaskets at the head to manifold joint. Jim
 
I'm guessing that the inline filters impede the flow a bit and as a result the length of time the fuel in the lines is exposed to head temps.?
 
worntorn said:
comnoz said:
gjr said:
Remove any inline fuel filters.
Jim
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Click to expand...

Jim, what problem is caused by (large capacity) inline fuel filters?

Glen
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They are just a place for the fuel to sit and get hot behind the cylinders. I have cured boiling fuel problems several time by removing them.

Use good screens in the tank.
 
Off on some warm weather riding for the next five days (Washington Vintage club Over the Pass Rally, etc) so the filters are coming off. I put them on a couple of years ago after inadvertantly leaving the bike sit over winter with the tank about 1/4 full of ethanol gas. This brought on a fair bit of fine rust in the tank, so the filters seemed a good idea. Now I make sure to keep the tank full for storage and also make sure that the gas for storage is ethanol free Chevron Supreme plus.

I haven't had any stalling problems before or after the filters, however I have noticed that if the hot bike is shut off for a few minutes it cannot be restarted without tickling the carbs. This must be from fuel boiling or vapourizing quickly.
I don't recall having this problem before installing the filters, so now it all makes sense.

Glen
 
Plenty examples of below tank filters placed to actually cool fuel thats heated in tank straddling engine so not filters directly causing heating but poor placement and hose routing, especially if following factory routing close to fins behind carbs. Its actually a good sign of good carb tune if requires a tickle cold or with heat soaked carb/fuel or implies too rich otherwise which tends to wash protective bore oil off.
 
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