Bmw r45 starting problem

petros-louca · Mar 28, 2019

Hello to all i hope everyone is doing well.
I need your help on this one.
A friend of mine recently bought an r45 kick start 1980 and his having problem starting the engine with the start button.. every time his hitting the start button there is a clicking noise coming from the starter area.... he remove the starter and test it on the bench and is working fine .. the battery is brand new as well. any advice on what to check next?

the video is what bike is doing when hitting the start button

pglaves · Mar 28, 2019

That clacking sound certainly sounds like the solenoid on top of the starter is not engaging. I am curious exactly how he is bench testing the starter. He needs to attach a heavy cable to the solenoid lug that doesn't have the wire to the starter motor and then use a small jumper to the connection for the wire coming from the starter switch. If he connects to the big lug on the solenoid with the big wire to the starter motor it will spin fine without the solenoid engaged.

frasermanx · Mar 28, 2019

Check the starter relay

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1074 · Mar 30, 2019

All electrical diagnostics start with a known good, fully charged battery! Your clicking sounds like a weak battery to me.

lmo1131 · Mar 31, 2019

Check the starter relay

+1. Lay your fingers on it while energizing the circuit to feel if the relay is cycling intermittently. It shouldn't be.

Or simply bypass the relay all together, as a test.

petros-louca · Apr 2, 2019

thank you all for your help end up that was the starter relay that has problem

Bmw r45 starting problem

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