Another RB bites the dust!

Anything related to Lambrettas... ask tech questions, post helpful info, or just read and learn.
eibargum
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Posts: 368
Joined: Wed Jan 07, 2009 6:38 pm
Main scooter: Vespa PX210 Polini
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If there sold in order then yours isnt too early, ive seen kempy stamping them as they leave the shop, bought mine not many weeks after they came out and i use a 60mm crank 107 rod, [they were made to run 58mm i believe] i had a mm taken off the bottom of the barral so the rings dont snag on the inlet finger and resessed the head. if youv a 110mm rod on a 60mm crank you wouldnt have to do the barral just use the right packer.
odd mod squad
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Posts: 33
Joined: Tue Oct 27, 2009 9:37 pm
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hello there
what happend to the piston :!: how was it destroyed and what damage was done to the barrel :?:
the problem is they were designed to run on a 58 crank,but some decided to use 60 this then coursed a problem with inlet finger with the ring snaging or not getting enough support
the early barrel the finger is small new ones are longer
and what piston was you useing i would only recomend the racetouer is very stronge and works well

all the best
rbgaz
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Posts: 539
Joined: Tue Mar 17, 2009 6:16 pm
Main scooter: gp rb230 dragster 180lc
Location: braintree lambretta breakfast club
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hi i holed two mb pistons on the exhaust side due to high temps when doing about 55 60 mph one at 800 miles an one at 1100 ive since done about 4000 miles on third piston in this time i retarded the bgm stator as far as it would go added a head gasket, fitted a koso egt gauge upjetted way beyond what tuners do 56 needle most use 58 380 main 25 pilot took me ages to find point were it was rideable prob u still hav is when cruiseing say 60 u not useing the 380 main so it heats up try a lower needle its unuseable hence im looking into the camlam power jet thats still sitting in its packet lol
odd mod squad
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Posts: 33
Joined: Tue Oct 27, 2009 9:37 pm
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i run the tmx 35 with 57 /340 no filter and augusto :!: it seems the 35 can run lean in certain parts
someone run a thread on this doing dino runs, there doesnt seem to be a happy medium :?:
i used to use a 58 and 320 and the engine was ok but got very hot :baddevil: i then changed to 56 and engine was to rich

can anyone help with the jetting :!: is it the carb or just the jetting any ideas :!:

happy days
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GP Kevo
registered user
Posts: 321
Joined: Wed Mar 11, 2009 7:48 am
Main scooter: 1969 150 DL / GP225 TS1
Location: Warsaw
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I run mine on 57 needle and 340 main, with MB flat ram air filter stuck to side panel. Just running in, so no long trips at sustained high speed yet. Dyno tuning it this Spring, any suggestions? I'll be in the UK then. Well, nevermind, I'll take to MB as they make a nice cupa tea. ;)
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