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Vespa GTS 300
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Posts: 12
Location: Cambridge UK
 
Member
Vespa GTS 300
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Posts: 12
Location: Cambridge UK
UTC quote
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.
@moto64 avatar
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Molto Verboso
'64 Motovespa 150S (177) , '65 VBB, '66 Allstate SF, '66 180SS
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Location: S.Salem, NY
 
Molto Verboso
@moto64 avatar
'64 Motovespa 150S (177) , '65 VBB, '66 Allstate SF, '66 180SS
Joined: UTC
Posts: 1876
Location: S.Salem, NY
UTC quote
Clutch key ?
@christopher_55934 avatar
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Ossessionato
2007 Stella 225
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Posts: 3547
Location: Rochester, Minnesota
 
Ossessionato
@christopher_55934 avatar
2007 Stella 225
Joined: UTC
Posts: 3547
Location: Rochester, Minnesota
UTC quote
I would pull clutch cover and clutch and have a look. Anything else is a guessing game at this point.
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parallelogramerist
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parallelogramerist
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Maybe the big circlip popped out of the groove in the clutch basket?
@safis avatar
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Ossessionato
1979 P150X, 1983 P200E, 1987 PK125XL Elestart, 1988 T5, 1995 PX200E, 2011 Yamaha Fazer 600 S2
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Posts: 4310
Location: Veria, Greece
 
Ossessionato
@safis avatar
1979 P150X, 1983 P200E, 1987 PK125XL Elestart, 1988 T5, 1995 PX200E, 2011 Yamaha Fazer 600 S2
Joined: UTC
Posts: 4310
Location: Veria, Greece
UTC quote
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)…
OP
UTC

Member
Vespa GTS 300
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Posts: 12
Location: Cambridge UK
 
Member
Vespa GTS 300
Joined: UTC
Posts: 12
Location: Cambridge UK
UTC quote
Thanks Guys, interesting about the Bgm cog issue.
@chandlerman avatar
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Lucky
76 Sprint V, 63 GL, 62 VBB, 05 Stella, 66 Smallstate, 79 P200E, 66 Lammy S3
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Location: Nashville

69 Days Since Last Explosion
 
Lucky
@chandlerman avatar
76 Sprint V, 63 GL, 62 VBB, 05 Stella, 66 Smallstate, 79 P200E, 66 Lammy S3
Joined: UTC
Posts: 9928
Location: Nashville

69 Days Since Last Explosion
UTC quote
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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