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I have the original battery in my bike, and its in reasonable condition. When the lights and rad fan are running, starting can be a little hesitant.
Does it ever start with the rad fan running?
The rad fan runs an electric motor which can consume reasonable current. I wouldnt be surprised if the amount of power that fan uses causes the hesitation in starting.
I also think (not 100% sure) that the older 600s and 750s use the same batteries, so with a bigger engine its going to have more trouble turning it over.
You might want to try a more powerful battery, but be careful of any side effects this might have.
Good luck
Does it ever start with the rad fan running?
The rad fan runs an electric motor which can consume reasonable current. I wouldnt be surprised if the amount of power that fan uses causes the hesitation in starting.
I also think (not 100% sure) that the older 600s and 750s use the same batteries, so with a bigger engine its going to have more trouble turning it over.
You might want to try a more powerful battery, but be careful of any side effects this might have.
Good luck