Generator rotor all of a sudden rubbing on fan cowling
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Lurker
P200e
Joined: 22 Jun 2020
Posts: 3
Location: Mt. Vernon, WA
Sat Jun 27, 2020 10:17 am quote
Just overhauled and redid my 1981 P200e and have been riding it for a month or so without above issue. Yesterday in middle of 10 mile ride the rotor started lightly scraping on the fan cowling but then progressed over about a mile to causing so much scraping and resistance to spinning that it would not stay running with clutch in or when coming to stop. Removed cowling and checked if rotor was tight and it is, ( I think )...
Does this sound like something anyone has experienced? During all of this increasing sound, the engine and tranny sounded OK.
See pics:
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Style Maven
74 50s x3 78 P200 84 Cosa PK50XL2 58 AllState 68 Sprint 80 50special '66(?) Super125
Joined: 22 Nov 2010
Posts: 7754
Location: seattle/athens
Sat Jun 27, 2020 10:41 am quote
Can you feel any side play in your crank?

Flywheel moved out or the cover moved in it would seem.
Hooked
Joined: 22 Jul 2018
Posts: 106

Sat Jun 27, 2020 11:49 am quote
I would immediately check that your clutch is not loose or the bearing is not loose in the seat. Those are the only 2 things that could effect the placement of the crank and flywheel.
Lurker
P200e
Joined: 22 Jun 2020
Posts: 3
Location: Mt. Vernon, WA
Sat Jun 27, 2020 1:10 pm quote
I will check.
Everything seems tight. Guess I have to pull engine out of scooter...?
Is it possible that rotor can be tight and still able to be pulled out while everything else inside engine,(bearing and clutch, etc) is ok?
Style Maven
74 50s x3 78 P200 84 Cosa PK50XL2 58 AllState 68 Sprint 80 50special '66(?) Super125
Joined: 22 Nov 2010
Posts: 7754
Location: seattle/athens
Sat Jun 27, 2020 2:33 pm quote
You don't have to pull motor to split it. Just sayin'.

Maybe tap flywheel(rotor) in with a mallet, and with a finger on edge of it and on the case. Feel it move any? Also check that clutch is TIGHT per spec, it could still work for a while if loose.
Lurker
P200e
Joined: 22 Jun 2020
Posts: 3
Location: Mt. Vernon, WA
Sat Jun 27, 2020 3:35 pm quote
V oodoo
I guess i am there.
Can you minimally explain how a “clutch” could potentially do this?
Thanks
Style Maven
74 50s x3 78 P200 84 Cosa PK50XL2 58 AllState 68 Sprint 80 50special '66(?) Super125
Joined: 22 Nov 2010
Posts: 7754
Location: seattle/athens
Sun Jun 28, 2020 12:28 am quote
THEORETICALLY!
and from a guy who's been wrong before: I'm imagining that a properly tight clutch would help 'trap' the crank in the position it is supposed against the clutch side bearing. The flyside bearing in a P motor is a roller type and has no effect on the crank position. The clutch woodruff key is massive because the clutch is not mounted on a taper like a smallframe motor and could probably still function if the clutch was loose. All speculation, as I have never experienced this.

I agree w/ BlackT5. So maybe remove your rear wheel and the clutch cover and have a look before tearing deeper into the motor?
Hooked
Joined: 22 Jul 2018
Posts: 106

Sun Jun 28, 2020 7:12 am quote
Yeah, no need to pull the motor. I had just finished swapping the clutch gear on the t5 when I replied. Too easy not to check.
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