Bump starting my Beemer

[Slipperyeel]

One thing to bear in mind on switching the ignition on, the fuel pump only runs for approx. 1 second and does not achieve full fuel pressure then the fuel pressure starts to drop off slowly as the one way valves in the pump do not seal 100%.
If the ignition is switched of and on the pump does not run until it has been stood for a while.
The fuel pump starts to run as soon as the start button is depressed. So another reason to hit the start button whilst trying to bump start the bike.

Mistacat. I think you've answered my question (the one I was about to ask) which is why can it be so hard to bump start?

I've not had to do it on the 1200, but I did a couple of times on the 1150. On the latter it worked fine .


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[turkuss]

Popinman the jump pack i have is a SUAOKI 8000mah pack its about the same size as a phone powerbank ,

 

[Popinman]

Popinman the jump pack i have is a SUAOKI 8000mah pack its about the same size as a phone powerbank ,

Thanks for that Turkuss.

 

[dashfixer]

Back in the 80s I bought a Yamaha XS1100 which had a duff battery (it helped bring the price down). The bike was electric start but had a detachable kick start housed under the saddle, it was such a faff to use that I used to bump start the bike. It was probably heavier than the GS also shaft drive, but I was a fit service man in my 20s and carried on doing it until I bought a new battery, about 2 months later!

I now use battery conditioners on all my bikes and in 20 years I've only had one battery problem and that was a sudden death occurrence.