ninjette.org - View Single Post - K7 GSXR600 Slow crank startup (Im stumped)

DannoXYZ · April 30th, 2020, 04:58 PM

Possibility. I had bike where handlebars controls banged into tank horribly. I'd always have to make sure my thumbs were clear. However, that caused start push-button to bang against tank and get stuck in ON position Didn't notice that starter was running full-time.

Eventually, not sure how long, starter started burning out. I pried stuck button back out but it was too late. Starter-bearings was seized up and spun slowly with variable speed, giving WHUPP-WHUPP sound each time it pushed a cylinder to TDC.

So... test your start-button electronically and make sure it doesn't stick ON after you push it. That whining sound may be starter continuously running. Easy test is unplug connector coming from your start-button (if accessible). Otherwise, measure power coming out of both wires of start-button when bike's running.

Or... just disconnect power-cable from starter after bike's running and see if whining starter stops.

You can also remove starter and bench-test it with battery. It should spin quickly and smoothly with no screeching, grinding or whining noises.

April 30th, 2020, 04:58 PM	#21
DannoXYZ ninjette.org certified postwhore Name: AKA JacRyann Location: Mesa, AZ Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot. MOTY - 2018, MOTM - Nov '17	Possibility. I had bike where handlebars controls banged into tank horribly. I'd always have to make sure my thumbs were clear. However, that caused start push-button to bang against tank and get stuck in ON position Didn't notice that starter was running full-time. Eventually, not sure how long, starter started burning out. I pried stuck button back out but it was too late. Starter-bearings was seized up and spun slowly with variable speed, giving WHUPP-WHUPP sound each time it pushed a cylinder to TDC. So... test your start-button electronically and make sure it doesn't stick ON after you push it. That whining sound may be starter continuously running. Easy test is unplug connector coming from your start-button (if accessible). Otherwise, measure power coming out of both wires of start-button when bike's running. Or... just disconnect power-cable from starter after bike's running and see if whining starter stops. You can also remove starter and bench-test it with battery. It should spin quickly and smoothly with no screeching, grinding or whining noises.