Mixture screw, which way?
Post Reply    Forum -> Not-So-Modern
Author Message
Member
1972 Vespa GTR
Joined: 05 Nov 2018
Posts: 28
Location: Halifax, England
Thu Nov 29, 2018 12:48 pm quote
Ok so I'm 40 mile into running in the scoot after new rings bearings and seals. And all told it's going quite well. However on tick over when the throttle is opened wide it dies a little before it revs up. Jets are standard on the 20/17 carb. Plug looks like this is brand new and it's a slightly warm plug for short journeys. So do I screw the mixture screw in or out?

20181129_204005.jpg

Hooked
GTS 300 Super
Joined: 13 Sep 2017
Posts: 469
Location: West Sacramento, CA
Thu Nov 29, 2018 12:49 pm quote
I still say "righty tighty; lefty loosy" so I'm no help
Member
1972 Vespa GTR
Joined: 05 Nov 2018
Posts: 28
Location: Halifax, England
Thu Nov 29, 2018 12:51 pm quote
Yep that didn't help one bit, but I'll try it anyway to see if it works.
Veni, Vidi, Posti
a herd of easy shifty rats
Joined: 22 Nov 2010
Posts: 6637
Location: seattle/athens
Thu Nov 29, 2018 1:48 pm quote
Go here, you shall find what you are seeking and more : Mixture screw adjustment, got a good link?
Member
1972 Vespa GTR
Joined: 05 Nov 2018
Posts: 28
Location: Halifax, England
Fri Nov 30, 2018 4:23 am quote
Thanks for that voodoo. It all seems so simple now
Member
1972 Vespa GTR
Joined: 05 Nov 2018
Posts: 28
Location: Halifax, England
Sat Dec 01, 2018 1:48 pm quote
Yeah so goes in the garage today to mess about with mixture screw, and.................all is well. No dip when applying throttle, nothing. Just perfect WTF. Well I'll take that any day and will put it down to the change in outside temp (about 4 degrees). Maybe.
Member
1972 Vespa GTR
Joined: 05 Nov 2018
Posts: 28
Location: Halifax, England
Mon Dec 10, 2018 1:54 pm quote
Well thought all was well but started playing up again and would not tick over. Changed the slow running jet and all is well. The jet I took out looked fine so how can that be?
Ossessionato
1980 P200E, 1974 Primavera, 04 Ninja 250
Joined: 04 Apr 2013
Posts: 3562
Location: San Diego, CA
Mon Dec 10, 2018 2:24 pm quote
put it in an ultrasonic bath and then put it back in if you have access to one
Cross Egypt Challenge - A 2400km ride throughout Egypt   Vespa Wasp Pin Badges   Cool Ass scooter seat cover
Post Reply    Forum -> Not-So-Modern
[ Time: 0.2594s ][ Queries: 25 (0.0425s) ][ Debug on ]