ive a 125cc tuned barrel with a lightend flywheel ,30mm carb ,and a ron moss avanti
the gearing is 125 special 46/15 ,it pulls great 1,2,3 and is ok in 4th on the flat and even into a wind not to bad but up hills or a strong wid ect not so good ,what gearing do you think would help
cheers
gearing help
other than fitting a 47 crown wheel you cant get it much lower than it is already
im guessing your on L plates ??
im guessing your on L plates ??
Its in bits scooter club: www.facebook.com/groups/132415046859320
no l plates
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Special X
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- Joined: Wed Jan 07, 2009 9:38 am
- Main scooter: Lambretta 125 special 230cc
- Location: Wakefield
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The set up you've described is a bit of a mismatch. The 30mm carb is too big for a 125cc lambretta, and a Ron Moss Avanti clubman is also too large. The gearset you're running is very close ratio, and very low ratio as well so it seems the motor is not pulling under about 5,000 - 5,500 rpm.
What port timings are on the barrel? and who tuned it, what was done?
If the barrel is ok then I would run a 25 PHBL and a 42mm clubman, or even a std box without mushroom baffle on a 125S motor. They were pretty fast for a 125 as std.
Alternatively you could keep the carb and exhaust, and fit a mugello 185 or similar and change the gearing to 18/47 or 17/46 (if you're a larger person or like revs.
What port timings are on the barrel? and who tuned it, what was done?
If the barrel is ok then I would run a 25 PHBL and a 42mm clubman, or even a std box without mushroom baffle on a 125S motor. They were pretty fast for a 125 as std.
Alternatively you could keep the carb and exhaust, and fit a mugello 185 or similar and change the gearing to 18/47 or 17/46 (if you're a larger person or like revs.
hi Ron moss tuned the barrel what ron did to it ive not a clue im really happy with it , its a 125 cc its not going to do 80mph but it does 65 the carb and exhaust work really well with it just thought if i changed the gearing it would help, the heads been skimmed also
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Special X
- registered user
- Posts: 407
- Joined: Wed Jan 07, 2009 9:38 am
- Main scooter: Lambretta 125 special 230cc
- Location: Wakefield
- Contact:
LI125S gearing is really low on 15/46 you could lower it further by fitting a 17 tooth chainwheel, giving a scary 6.27 overall, but then you'd be at just over 8,000 rpm at 65mph.
Ron won't have overtuned the barrel as he knows exactly what He's doing but I really thing a smaller carb, a 26 phbh at the most would improve matters. I run a 26 phbh on a 230cc cast iron motor tuned by Harry Barlow. I do get an improvement when I fit a 30mm carb on it but it's not a great deal.
Ron won't have overtuned the barrel as he knows exactly what He's doing but I really thing a smaller carb, a 26 phbh at the most would improve matters. I run a 26 phbh on a 230cc cast iron motor tuned by Harry Barlow. I do get an improvement when I fit a 30mm carb on it but it's not a great deal.
Cheers special x I'll have a think about the carb but I like look and sound of the flatside lol might just leave thing as they are cheers