Starter gear not disengaging - MVAgusta.net
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post #1 of 16 (permalink) Old 11-20-2016, 07:50 AM Thread Starter
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Starter gear not disengaging

Wonder if anyone has had the following issue and if so how did you resolve it?

Fired up my 2001 F4 750 after a long layup, bike fires but it sounds as if the starter gear is not disengaging, if I gently rev the engine the whine gets louder.

Any ideas what is the issue and an idea of what to do thanks.

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post #2 of 16 (permalink) Old 11-20-2016, 08:14 AM
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Pull the starter and see what's up.

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post #3 of 16 (permalink) Old 11-20-2016, 08:25 AM Thread Starter
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Quote:
Originally Posted by silentservice703 View Post
Pull the starter and see what's up.
Cheers Chuck, but is the starter gear assembly accessible from there? The starter motor shaft seems to slot into the engine case, or am I missing something?

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post #4 of 16 (permalink) Old 11-20-2016, 09:07 AM
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You aren't missing anything. Sometimes, after a layup and an issue, simply disassembly and reassembly solves the issue by freeing up components.

I wouldn't run the bike if you think the starter is being turned by the engine. It will damage the starter and possibly the engine.

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post #5 of 16 (permalink) Old 11-20-2016, 09:08 AM
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Of course, you could just do what we used to do "old school" with car starters...give it a whack!

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post #6 of 16 (permalink) Old 11-20-2016, 10:01 AM
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I just had a look through the Engine Manual. The device is called a Free Wheel in the manual...we commonly call it the Sprag Clutch here.

It is possible that this device has simply "frozen" due to thickened oil residue or other detritus.

I have not removed a starter, nor delved into a sprag replacement, so I don't have any practical advice on how difficult it may be.

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post #7 of 16 (permalink) Old 11-20-2016, 11:30 AM
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Don't forget, if you drive a motor externally like that it becomes a generator.

Do something today that your future self will thank you for.
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post #8 of 16 (permalink) Old 11-20-2016, 12:24 PM Thread Starter
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Quote:
Originally Posted by silentservice703 View Post
I just had a look through the Engine Manual. The device is called a Free Wheel in the manual...we commonly call it the Sprag Clutch here.

It is possible that this device has simply "frozen" due to thickened oil residue or other detritus.

I have not removed a starter, nor delved into a sprag replacement, so I don't have any practical advice on how difficult it may be.
Yep it is a free wheel assembly with a sprag built into the one way clutch, I suspect your right that oil drain down over time has allowed this to freeze up and that's what is happening. I will pull the starter motor an see what can be got at but I believe I will have to pull the whole assembly out to really get at the problem.

Hopefully not done any damage to the starter and assembly, whenI did fire the bike revs never went above 1500rpm and very short time run, less than 30 seconds.

Wonder how to access the assembly, anyone delved into this area before?

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in the garage: 2001 F4 750 1+1, 2005 Brutale 910S Carbon, 2007 Brutale 910R, 2009 F41000R, 2013 Brutale 800, 2015 Turismo Veloce 800,1976 Triumph T140D Bonneville, 1976 Honda CB400F2.
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post #9 of 16 (permalink) Old 11-20-2016, 02:00 PM
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Have a look at the engine manual. It is where I got my information. Removing the starter, you can at least see if the driven gear is frozen or if it "free wheels" as it should.

Any damage would be in the form of insulation breakdown due to overheating from turning your motor into a generator. Remember that the engine is driven through a reduction gear by the starter motor. That "reduction" is a multiplier when the engine is driving the starter.....

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post #10 of 16 (permalink) Old 11-20-2016, 03:04 PM
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Have you looked at the starter switch yet Jim.It could be sticking.


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