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Hi can anyone give me wrough heads up on what jets I should be using on Avanti 225 30 mm delorto avanti franspeed pipe jl3 cheers

I'd start with:

Choke 70
PJ 56
Slide 40
Atomiser AV266
X7 needle 2nd clip down
MJ 125

The MJ is probably a tad too big but it's starting point. Likewise the PJ and needle may require changing. The only ones i'd be firm on are the choke, slide and atomiser.

running a filter may richen it all up but i found (using a Breathsweet filter) that it didn't make much difference. I used a shorter type filter and it was un-rideable in the lower revs.

As above pretty much but I have an x13 needle and 55 pilot but it hasn't been set up on a dyno and I although I covered about 4000 miles with that set up I was never truly happy with it. I also used a breathsweet filter.

MickYork wrote:I'd start with:

Choke 70
PJ 56
Slide 40
Atomiser AV266
X7 needle 2nd clip down
MJ 125

The MJ is probably a tad too big but it's starting point. Likewise the PJ and needle may require changing. The only ones i'd be firm on are the choke, slide and atomiser.

running a filter may richen it all up but i found (using a Breathsweet filter) that it didn't make much difference. I used a shorter type filter and it was un-rideable in the lower revs.

All the jets check out Ron Moss did the jettin its a new tank new bgm stater and flywheel timing set at 17 btdc its sparking just got daught how far choke plunger should travel it's only moving about half way up the hole

half ways fine, it doesn't have to move much to do its job.

i'm edging towards an electrical problem if you've still got problems starting.

I don't know what you're like for spares but i'd be swapping bits over (with known working) to eliminate the problem. A spare carb' would be a good starter (excuse the pun !!) followed by the electrics (plug, lead, cdi, stator).

Whereabouts are you ? plenty of spares in my garage................

Cheers for all the help mate popped round timing was mile out red faced my excuse I only have to put petrol in my GTS it's been 35 years since I had a lambretta but rest assured I'll bin the GTS if this is reliable yours mr red face hope GTS ain't swearing on hear I'll probably get banned for using it

i have nearly the same setup but with a supertourer pipe,just had it dynoed and the carb setting are av268,x7 therd clip,55 pilot 128 main,air to fuel ratio bob on,but a little rich as am running inn,may change to 125 main in a few 100 miles!