Author Topic: Gy7 starter motor (big boy rct170)  (Read 232 times)

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Offline Mat1998

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Gy7 starter motor (big boy rct170)
« on: May 23, 2017, 06:05:35 AM »
So I recently took my big boy rct170 in for the 3000 km service and ended up paying 2 grand for the service and new starter motor( even though the bike started with the old one) have any of you had issues with the starter motor?


Offline 1200GXman

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Re: Gy7 starter motor (big boy rct170)
« Reply #1 on: May 23, 2017, 01:42:45 PM »
Take the old one, get it serviced or service it yourself and keep it spare. What is their reason for replacing the starter?
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Offline Mat1998

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Re: Gy7 starter motor (big boy rct170)
« Reply #2 on: May 23, 2017, 05:30:44 PM »
I kept the old one as a spare, I complained that it doesn't want to start in the winter the starter motor is turning it just doesn't start so I've had to jump start it for the last week and it wasn't the battery because I had that tested but it did start so it couldn't have been the starter motor because when it was warmer it started just fine.


Offline 1200GXman

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Re: Gy7 starter motor (big boy rct170)
« Reply #3 on: May 24, 2017, 08:07:28 AM »
So the starter does turn the engine? Not spinning free with symptoms of a broken gear?

To the experts:
Can the spark plug cause difficult start in winter?
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Offline Mat1998

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Re: Gy7 starter motor (big boy rct170)
« Reply #4 on: May 24, 2017, 08:42:14 AM »
The starter does turn the engine, but they claim not fast enough, which to me sounds more like a battery issue even though the battery recently went for a load test and was given the all clear

Offline Stanthescooterman

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Re: Gy7 starter motor (big boy rct170)
« Reply #5 on: May 27, 2017, 06:20:32 AM »
The starter does turn the engine, but they claim not fast enough

This can sometimes be as a result of an earth cable making poor contact.

I have even come across a case where the guy over-filled the engine oil, and the crankcase breather must have been blocked, which forced some oil into the starter motor, which obviously affected it's efficiency, but this sort of issue is unlikely with a "low" mileage engine.

Ambient temperature will affect battery performance more than any other component in the electric starting circuit, however if other issues are present, such as dirty spark plug, carb issues, or starter motor gripes and a sulphated cheap Chinese battery, the sum-total can be more than the battery can handle in cold weather.

Diagnosing this sort of thing over the Interwebs is near impossible and there is not always a textbook "copy and paste" case, so often these scenarios need to be directly evaluated on a "case by case" basis.

The bottom line is: Is your starting issue solved after the service? R2K for this kind of work at the dealership is not unheard of.
Previous bikes & scooters:
BMW C600 Sport
Kymco Grand Dink 250 (300),
BMW F650GS Dakar,
Gilera Runner 180,
Kymco Agility 125,
Kymco TB100,
Kymco Heroism KH125,
Honda CBX550FII,
Suzuki RG50 Gamma