Need Help 2021 BMW R18 FE does not crank unless boosted. When boosted cranks but doesnt start.

[20pete]

When I push the start button without my boost pack on it can hear the starter relay click but nothing happens. The fuel pump is also running. But if I hook up my booster the engine cranks over but does not fire up.

It first happened after washing the bike. I went to start it after and it did a half rotation then died.

I towed it home and was assuming something was just wet and it would work when dried but it continued to not work.

The battery was reading only 12.5 volts so I replaced the battery and the new one is reading 12.8 and still has the same problem.

All the connection to tge battery are also fine and im really at a loss.

 

[Star-Lord]

How are you connecting the jump pack; are you using the (-) Ground stud underneath the RHS cylinder and the (+) stud on the RHS of the bike?

You mentioned the battery connections.... How about the Ground and Positive landing points on the bike; are they clean and snug?

Did you wash your bike with a power washer or the old fashioned way?

 

[20pete]

How are you connecting the jump pack; are you using the (-) Ground stud underneath the RHS cylinder and the (+) stud on the RHS of the bike?

You mentioned the battery connections.... How about the Ground and Positive landing points on the bike; are they clean and snug?

Did you wash your bike with a power washer or the old fashioned way?

I am hooking the jump pack to the studs on the right side of the bike.

I have checked the positive connection that is held in by the jump post. I have not checked the checked the ground (I do not know where that is on the bike)

And I washed it with a power washer.

 

[Star-Lord]

Any updates or root cause...?

 

[Star-Lord]

The Control Unit on the R18 Model B is located under the seat pan area, near the rear strut; perhaps, try looking at those connections as a possible water ingress point from power washing..?