gt200 ?

Anything related to Lambrettas... ask tech questions, post helpful info, or just read and learn.
steve chapman
registered user
Posts: 231
Joined: Sat May 09, 2009 2:31 pm
Contact:

Can anyone tell me what timinig people are using on there gt200 kits, I'm using a bgm box pipe ., steve
User avatar
Rich_T
Dealer
Posts: 540
Joined: Fri May 29, 2009 8:07 pm
Main scooter: Li Special
Location: Birmingham
Contact:

With box pipes 18-19 degrees. With expansions 17-18 depending on rev range.
steve chapman
registered user
Posts: 231
Joined: Sat May 09, 2009 2:31 pm
Contact:

Thanks for the reply Rich, thats what im curently running , the reason for the question is i had i slight seeze , and checked the plug and it was grey rather than a nice brown colour , my other settings are 30mm phbh 130 main , x13 on 2nd clip , 40 float, 55 pilot , any ideas? Steve
eden
Dealer
Posts: 1043
Joined: Thu Feb 27, 2014 8:44 pm
Location: ILCLAND
Contact:

which atomiser?
main is a little small... use 135
User avatar
Rich_T
Dealer
Posts: 540
Joined: Fri May 29, 2009 8:07 pm
Main scooter: Li Special
Location: Birmingham
Contact:

PM me the engine specification, and the history and we'll go from there. Like Eden says, the Main is normally 135.
User avatar
drunkmunkey6969
Moderator
Posts: 2838
Joined: Sun Jan 04, 2009 1:42 pm
Main scooter: '69 Lambretta GP
Location: North Yorkshire
Contact:

Rich_T wrote:With box pipes 18-19 degrees. With expansions 17-18 depending on rev range.
Hey Rich, I'm quite surprised at the suggested 18/19 degrees on the box pipe.

Out of curiosity Rich, what's your personal reasoning on the differential between ignition timing on box pipes vs expansions? I'd be intrigued to know. Cheers, Dan.

Image
See our YouTube scooter channel for Tech-help: https://www.youtube.com/c/TheScooterFactory/videos
Muppet
registered user
Posts: 1279
Joined: Thu Sep 16, 2010 9:54 pm
Main scooter: SX 150 running in

a lesser more spread return pulse is my guess on the box pipe
C’est la vie
steve chapman
registered user
Posts: 231
Joined: Sat May 09, 2009 2:31 pm
Contact:

hi Eden the atomiser is an av268, Steve
steve chapman
registered user
Posts: 231
Joined: Sat May 09, 2009 2:31 pm
Contact:

Rich , the engine spec is as follows

60/110 gt crank , bgm box pipe , 30mm phbh with breathsweet ,x13 needle 2nd clip from top, av268, 55 pilot , 130 main
engine has done about 150 miles so far with no problems just started to take it to about 50mph over the last few days and as i say it nipped up on me , plug colour is light grey , any help would be great
regards , Steve
User avatar
Rich_T
Dealer
Posts: 540
Joined: Fri May 29, 2009 8:07 pm
Main scooter: Li Special
Location: Birmingham
Contact:

The main is a bit weak but even so if you are still running it the plug should not be grey by any stretch. Does the engine tick-over nice and start first or second kick from hot and cold? Are you using a porcupine head and a copper head gasket, base packer and gaskets? How many of the packers and gaskets are GT parts. How old is the carb. When you had a nip up, what were you doing (apart from riding), accelerating, decelerating, what speed? How are you "running in" around town, long runs, are you giving it full throttle? What plug are you running?
Post Reply Previous topicNext topic
  • Information
  • Who is online

    Users browsing this forum: Google [Bot] and 19 guests