Bulut and The Alp that doesn"t Fire Up!

Bad news, even with that setup still benzine coming out of exhaust when the tap is in “on” position.

I have no idea why it’s happening with original fuel tank but not with the dummy fuel tank…

But as it seems vacuum tube is not the one to blame.

After further research it got me thinking about float heights might be worthwhile to check again... Even it does not explain "why no issue with the dummy fuel tank?" question.

Thanks Rob,

Even though I was sure about the settings of floats I remove them and check for any cracks and also test with pressure if the needle is setting fully to cut of fuel supply. All works properly.

I reinstall the carbs with new boots to eliminate any air leak issue as well. Tried it yesterday and after 20 min o running it stalled again...

Luckily I had a video this time to show you all what is going on with my Alpje! I edited it to make it short but still 12 mins, thanks for your patience and recommendations in advance!



Cheers,
Bulut

Did you already switched CDI's and watched the tachometer on the moment of stalling?

Hi Alain,

Thanks for the recommendation, yes the CDI is replaced with new ignitechs

Hi Bulut,

I've read that you have checked the ignition coils? But how did you test them? They should produce 2 different values. 1 "cold" and 1 somewhere around 20 degrees. If one of them is faulty, it is possible that the "cold" value is ok. But after heating up, the "hot" value will become faulty. This would explain why the engine runs somewhat ok in cold conditions, but deteriorates after some time.

Also bad electrical connections can fail due to heat.

Goedemiddag allemaal,

Thanks again to all for the support.

Timo,

I take out the HT Coils and measure Primary winding 0.1 and secondary 8.4 for all 4 coils. I don't know how to measure it while its attached to motorcycle, any guidance is appreciated. For pulser coil Fr 425 Rr 415 and I also checked them while running(after 10 min) they were still in range.

Alain,

True that, but electrical systems a little bit beyond my skills for now. Always found it too complicated

Rob,

I tried your recommendation just now and with external tank it runs well for 10+ min again (while actual tank is also on the bike). Then I shifted the actual tank and it stalled again 2 min later. I think it's time to bring my Alpje to the Shop, I don't wanna miss these sunny days any more I'll reach out to you today/tomorrow.

I have just read the whole topic again to refresh my memory.

It seems your main problem is too much fuel coming to the engine when you use your regular petrol tank.

To my mind, this can basically happen for two reasons:
- fuel coming through vacuum line on petcock,
- float valves not closing properly.

It seems you have investigated both items and have at leasr ruled out option 1.

This is more or less what Rob also wrote. Still, with you being less experienced than Rob, I'd head over to him and let him take a look.
(No offense meant, just trying to offer my best advice.)

This is what the reading should be

Hi Garfield Hi Timo,

Thanks for the responses! indeed I think I did these checks by the book but maybe missing something... That's why today is the day to load my Alpje in a Van and drop by to Rob's place! Hopefully he'll discover the issue and my next post will be about my two week travel plan in May

Fijne weekend!

I think that's a smart decision.
I'm sure he'll fix the issue well in time before your trip.
Keep us posted, I'm curious too !

Nog nieuws?