OP
@gatekeep avatar
UTC

Molto Verboso
1974 Rally USA 200 1980 P200e
Joined: UTC
Posts: 1809
Location: Pioneer Valley Ma.
 
Molto Verboso
@gatekeep avatar
1974 Rally USA 200 1980 P200e
Joined: UTC
Posts: 1809
Location: Pioneer Valley Ma.
UTC quote
Rookie mistake, I tightened up my 26/26 carb bolts too much, and now my throttle slide is sticking big time. I remember doing this years ago and having to buy a new carb.
I must have pinched the slide channels. Any remedies ?
Rally 200
@v_oodoo avatar
UTC

Style Maven
'74 50s x3 '87 PK125XL '92 PK50XL2 Plurimatic - & - '58 AllState '68 Sprint '66(?) 125 Super '72 DanMotor 150 Super and '04 Bajaj LML hybrid
Joined: UTC
Posts: 10121
Location: seattle/athens
 
Style Maven
@v_oodoo avatar
'74 50s x3 '87 PK125XL '92 PK50XL2 Plurimatic - & - '58 AllState '68 Sprint '66(?) 125 Super '72 DanMotor 150 Super and '04 Bajaj LML hybrid
Joined: UTC
Posts: 10121
Location: seattle/athens
UTC quote
I fixed a 24/24 w/ a good quality, sharp fine file. Cut, try & repeat and you should be able to spot the pinch points in the channel near that bolt hole.
@moto64 avatar
UTC

Ossessionato
'64 Motovespa 150S (177) , '65 VBB, '66 Allstate SF, '66 180SS, '58 LD 125 (150)
Joined: UTC
Posts: 2454
Location: NYS
 
Ossessionato
@moto64 avatar
'64 Motovespa 150S (177) , '65 VBB, '66 Allstate SF, '66 180SS, '58 LD 125 (150)
Joined: UTC
Posts: 2454
Location: NYS
UTC quote
I would also check the base of the carb for flat. Chances are you have warped it if you tightened the bolts enough to jam the slide. Remem
ber that a very thin gasket is all that is required under the carb and one that is too thick can ( will) compress and allow the 'ears' to bend down. If the carb base is perfectly flat it should seal just fine and not allow the base to warp.
@worrywort avatar
UTC

Hooked
PX125E
Joined: UTC
Posts: 190
Location: Gravesend, Kent, UK
 
Hooked
@worrywort avatar
PX125E
Joined: UTC
Posts: 190
Location: Gravesend, Kent, UK
UTC quote
Hello.
Some lessons are expensive. Do you want to risk the carb slide jamming open?
Take it off, bash it with a hammer to get over it. Buy a new one and use a torque wrench and new gaskets to fit it properly next and every time after.
@v_oodoo avatar
UTC

Style Maven
'74 50s x3 '87 PK125XL '92 PK50XL2 Plurimatic - & - '58 AllState '68 Sprint '66(?) 125 Super '72 DanMotor 150 Super and '04 Bajaj LML hybrid
Joined: UTC
Posts: 10121
Location: seattle/athens
 
Style Maven
@v_oodoo avatar
'74 50s x3 '87 PK125XL '92 PK50XL2 Plurimatic - & - '58 AllState '68 Sprint '66(?) 125 Super '72 DanMotor 150 Super and '04 Bajaj LML hybrid
Joined: UTC
Posts: 10121
Location: seattle/athens
UTC quote
smash it if you must
But make that little cut in the carb body, new or old, so this can't happen. Will find in tips n trix later & add link.

Well earned moniker, worrywort and you have a point. If you do such a shitty job smoothing and checking and verifying it works OK, then yes, you will definately and immediately jam the throttle wide open which may not be best for your motor or your nice clean undies.
OP
@gatekeep avatar
UTC

Molto Verboso
1974 Rally USA 200 1980 P200e
Joined: UTC
Posts: 1809
Location: Pioneer Valley Ma.
 
Molto Verboso
@gatekeep avatar
1974 Rally USA 200 1980 P200e
Joined: UTC
Posts: 1809
Location: Pioneer Valley Ma.
UTC quote
V oodoo wrote:
But make that little cut in the carb body, new or old, so this can't happen. Will find in tips n trix later & add link.

Well earned moniker, worrywort and you have a point. If you do such a shitty job smoothing and checking and verifying it works OK, then yes, you will definately and immediately jam the throttle wide open which may not be best for your motor or your nice clean undies.
Carb cut in body? Tips & tricks ?
@v_oodoo avatar
UTC

Style Maven
'74 50s x3 '87 PK125XL '92 PK50XL2 Plurimatic - & - '58 AllState '68 Sprint '66(?) 125 Super '72 DanMotor 150 Super and '04 Bajaj LML hybrid
Joined: UTC
Posts: 10121
Location: seattle/athens
 
Style Maven
@v_oodoo avatar
'74 50s x3 '87 PK125XL '92 PK50XL2 Plurimatic - & - '58 AllState '68 Sprint '66(?) 125 Super '72 DanMotor 150 Super and '04 Bajaj LML hybrid
Joined: UTC
Posts: 10121
Location: seattle/athens
UTC quote
Yep, search around in here & I will too: Random tricks, share your best little tips & shortcuts
and I'll have a race w/ you to see who finds it first!

edit: nevermind, got it https://modernvespa.com/forum/post1813243#1813243
Ginch wrote:
Scooter-Center wrote:
Who it exaggerates when tightening the screws, could have to fight later with a slide is stuck. All newer SI carburetor have already experienced an improvement, so that the screw head can not act directly on the slide guide.

This is indicated by a small undercut. This trick can also be applied to the older carburetor.
External inline image provided by member with no explanatory text
OP
@gatekeep avatar
UTC

Molto Verboso
1974 Rally USA 200 1980 P200e
Joined: UTC
Posts: 1809
Location: Pioneer Valley Ma.
 
Molto Verboso
@gatekeep avatar
1974 Rally USA 200 1980 P200e
Joined: UTC
Posts: 1809
Location: Pioneer Valley Ma.
UTC quote
Moto64 wrote:
I would also check the base of the carb for flat. Chances are you have warped it if you tightened the bolts enough to jam the slide. Remem
ber that a very thin gasket is all that is required under the carb and one that is too thick can ( will) compress and allow the 'ears' to bend down. If the carb base is perfectly flat it should seal just fine and not allow the base to warp.
I will put it flat on a pane of glass and check.

Modern Vespa is the premier site for modern Vespa and Piaggio scooters. Vespa GTS300, GTS250, GTV, GT200, LX150, LXS, ET4, ET2, MP3, Fuoco, Elettrica and more.

Modern Vespa is made possible by our generous supporters.

Buy Me A Coffee
 

Shop on Amazon with Modern Vespa

Modern Vespa is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to amazon.com


All Content Copyright 2005-2026 by Modern Vespa.
All Rights Reserved.


[ Time: 0.0092s ][ Queries: 4 (0.0020s) ][ live ][ 343 ][ ThingOne ]