Engine Runs A Short Time Then Stalls

[85killzillaRS]

Ï have ridden only twice since installing motor
both times it has started and ran great
Then after about a mile it dies and wont start, gas flows but no spark
Ive walkes it home twice, then waited over night, and it starts right up
-anyone have any ideas

[The Mighty Gryphon]

Can you hear the pump run for a second after you press the start button?  The four pin tank connector is a pretty common reason for non-running and random quitting.  It's the first thing I would check.

[85killzillaRS]

gas pumps through, Ï can smell it and see it on a plug Ï pulled
Literally there is no spark
It just fired up
Im not ready to go for another mile ride and the push home

[85killzillaRS]

yesterday gas was pumping and no spark
this morning it has fired right up
if Ï go for a very short ride it will die,
then fuel but no spark
Ï am not ready to do the same thing again

[The Mighty Gryphon]

When it shuts down, is it a quick shutdown like turning the engine off, or does it break up and die gradually? 

Is the engine still cold when it shuts down?

If you pull the plugs out and dry them, will the engine start? 

Are the spark plugs black and sooty?

[Laitch]

Ï go for a very short ride it will die, then fuel but no spark

Do you intend to check the frame ground connections for corrosion and tightness, battery connections for corrosion and tightness, the coil wires and terminals for corrosion and fit, the individual coil outputs, and tight connections on both the ignition control unit and the Jetronic connector, or have you already done that?

[Martin]

Hall effect sensors can overheat and shutdown, once they cool down enough they will recommence working. A hairdryer/ heat gun can be used to see if it is a problem. Start it up on the centre stand and point the heat gun at the sensor. If it shuts down you have found your gremlin.
Regards Martin.

[Chaos]

+1 on the HES.  When the go bad they work fine cold, quit working when they head up.

[85killzillaRS]

all connections are good, battery is a new sealed dry cell
 when it stalls, it is as if gas was shut off.
Both times it stalled a bit after fan came on. Ï checked for any water leaks and didn’t see any. A heated hall sensor would make sense. I’ll try the heat gun on the sensor while it’s running method now.

[85killzillaRS]

so heat gun pointed at small T-shaped cover on right front of block or do Ï need to open it up 1st ?

[Chaos]

take the t shaped cover off and heat up the innards, see if it stops running

[daveson]

Also, the fan shouldn't come on after a short one mile trip. Possibly the temperature signal is whack.

[85killzillaRS]

it’s 105F today and Ï do have a heavy right wrist  :)

[daveson]

I'd still have a long sleeve shirt on.

[85killzillaRS]

Ï always wear helmet, leather jacket, pants, boots, & gloves regardless of temp
it’s so important to keep the body & brain looking & working well !!!

[85killzillaRS]

Ï looked it up
60f in Australia today - LUCKY
it was 105 here today and i’ve been in the F*ing garage

Ï should be riding sooner or later

[85killzillaRS]

Ï put a heat gun on uncovered Hall, seemed hot enough, but it still ran. So i’ll put things back together and go for ride tomorrow. I’ll bring tools with me to pull plugs, and try to stay close to home for highly probable push back. If Ï can go early it should be warm and not HOT yet. It’s 9pm here now, perfect time to go work in garage for a little while. I’ll post any results tomorrow AM. Thanks for all correspondence, Ï do appreciate it!!!

[Laitch]

when it stalls, it is as if gas was shut off.

It's probably also like the electricity was shut off, too.  If it shuts off again when the fan starts, I might be tracing the fan wiring.

[The Mighty Gryphon]

when it stalls, it is as if gas was shut off.
Both times it stalled a bit after fan came on.

When I shut off the fuel to an engine it stumbles to a stop.  Is that what yours did?  So, did it stumble to a stop, or did it shut off suddenly?

It's almost impossible for the fan to come on after 1 mile.  How long are you letting it idle before you go for a ride?  From the time you started the engine, how long does it take to shut down?  Is it the same every time?

[daveson]

"I checked for any water leaks and didn't see any"

You got any water?

[Laitch]

You got any water?

If you mean sufficient coolant in the radiator and its reservoir, that's a good question needing an accurate answer.  Does the temperature light come on before the fan starts, when the fan starts or after the fan starts?

[85killzillaRS]

some good info was posted,
i’ll go for a ride in a bit
today Ï will time it from startup & pay close attention to when fan starts, my radiator is full and catch can is half full, fan wiring is just the plug connected. It’s actually kind of nice expecting trouble, Ï won’t go far at all. Ï should be back in an hour or so and post my findings.
Ç

[85killzillaRS]

Ï didn’t get started as early as Ï wanted, but now everything is put back together and i’ll go as soon as Ï shower, it’s already 108F today. So i’ll stay pretty close to home. All connections are good and tight. Lights work, rad is full, catch can 1/2, a gallon or two fuel. Someone asked if Ï have a pre-ride checklist. That’s pretty much it for a close to home cruise.
When/if Ï have trouble today, what should Ï be checking. Before, it wouldn’t spark for basically rest of day so Ï should have plenty of time to go through what Ï need to. I’ve seen some sort of trouble shooting guide here a while back. Would someone please post a link. Alright, i’ll be outta here in 20min

[Laitch]

I’ve seen some sort of trouble shooting guide here a while back.

Type troubleshooting guide into the search box at the top of the page, select entire forum then press Search.

[85killzillaRS]

oh yeah, oil is good
it’s nice having the sight on the side of block ;)