Sun Jun 19, 2022 9:33 am

Member
Vespa GTS 300
Joined: 15 Feb 2021
Posts: 12
Location: Cambridge UK
 
Member
Vespa GTS 300
Joined: 15 Feb 2021
Posts: 12
Location: Cambridge UK
Sun Jun 19, 2022 9:33 am linkquote
Hi all, I had a full new Px 244 engine built 1690 miles ago with all uprated components and even new casings. I rode faultlessly until this morning, through the gears absolutely no indication of what was to come, pulling up hill in third/ change to 4, transmission dies, engine still running, but no drive. Turned off I can change gears on selector and clutch pulled in makes a difference like it's engaging, kick start acts like the clutch pulled in. There's no crunchy noises, and free wheels ok . Ideas please guys, I'm a bit rusty.
Sun Jun 19, 2022 9:37 am

Molto Verboso
'64 Motovespa 150S (177) , '66 Allstate SF, '65 VBB, '66 180SS
Joined: 27 Mar 2013
Posts: 1316
Location: S.Salem, NY
 
Molto Verboso
'64 Motovespa 150S (177) , '66 Allstate SF, '65 VBB, '66 180SS
Joined: 27 Mar 2013
Posts: 1316
Location: S.Salem, NY
Sun Jun 19, 2022 9:37 am linkquote
Clutch key ?
Sun Jun 19, 2022 11:03 am

Ossessionato
2007 Stella 225
Joined: 02 Nov 2019
Posts: 2684
Location: Rochester, Minnesota
 
Ossessionato
2007 Stella 225
Joined: 02 Nov 2019
Posts: 2684
Location: Rochester, Minnesota
Sun Jun 19, 2022 11:03 am linkquote
I would pull clutch cover and clutch and have a look. Anything else is a guessing game at this point.
Sun Jun 19, 2022 11:14 am

Ossessionato
Joined: 26 Oct 2015
Posts: 3563

 
Ossessionato
Joined: 26 Oct 2015
Posts: 3563

Sun Jun 19, 2022 11:14 am linkquote
Maybe the big circlip popped out of the groove in the clutch basket?
Sun Jun 19, 2022 11:50 am

Ossessionato
1979 P150X, 1983 P200E, 1988 T5, 1995 PX200E, 2011 Yamaha Fazer 600 S2
Joined: 02 Aug 2015
Posts: 3001
Location: Veria, Greece
 
Ossessionato
1979 P150X, 1983 P200E, 1988 T5, 1995 PX200E, 2011 Yamaha Fazer 600 S2
Joined: 02 Aug 2015
Posts: 3001
Location: Veria, Greece
Sun Jun 19, 2022 11:50 am linkquote
Whatever it is, it's clutch side related. Could be an eaten woodruff key or eaten primary teeth, especially if you used BGM cogs (lots of fails lately)…
Sun Jun 19, 2022 12:01 pm

Member
Vespa GTS 300
Joined: 15 Feb 2021
Posts: 12
Location: Cambridge UK
 
Member
Vespa GTS 300
Joined: 15 Feb 2021
Posts: 12
Location: Cambridge UK
Sun Jun 19, 2022 12:01 pm linkquote
Thanks Guys, interesting about the Bgm cog issue.
Sun Jun 19, 2022 1:12 pm

Lucky
76 Sprint V, 63 GL, 62 VBB, 05 Stella, 66 Smallstate, 08 Stella (for now)
Joined: 16 Jun 2011
Posts: 5991
Location: Nashville
 
Lucky
76 Sprint V, 63 GL, 62 VBB, 05 Stella, 66 Smallstate, 08 Stella (for now)
Joined: 16 Jun 2011
Posts: 5991
Location: Nashville
Sun Jun 19, 2022 1:12 pm linkquote
Put me down for "it's the clutch," too. In particular, I think you've sheared the woodruff key.

I sheared my woodruff key a few years ago and it was a similar experience. Assuming that's the case, you'll almost certainly need a clutch puller to get it off--the usual two screwdriver method won't work. Then there will be the question of if the crank or cog can be saved.

Crimaz make a hardened woodruff key for high output motors, but splined cranks are becoming a thing for a reason.

I don't think it's the cogs. Broken gear teeth tend to get caught up in the rest of the gearbox and jam it solid (at a minimum) in my experience.
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