vespa t5 gearing

[ducksta]

just been to cleethorpes and the scoot struggled in the wind friday struggling to get 60mph showing on the speedo? even on the way home it wouldnt pull

ENGINE SPEC (this years engine first real run on it)
t5 malossi 172 tuned crank tuned casings all matched standard flywheel 30 mm phbh carb on a malossi reed valve,simmonini exhaust (17.8 bhp on the dyno) Now the gearing set up, standard t5 box drt 23 tooth clutch centre 67 tooth primary, SO AM I OVER GEARED and should i drop down to a 21 tooth clutch centre

[joeythescooterboy]

Had 21/68 on mine and it went like s**t off a chrome stick (with a Taffy Goldline).........
21/68 = 3.24:1
22/68 = 3.09:1
23/67 = 2.91:1

I'd say that yes you are a bit overgeared.

[ducksta]

so dropping to a 21 would help then

[joeythescooterboy]

67/21 = 3.19:1
67/22 = 3.05:1

It'd definately help keep you in the power band and be better on hills and into a headwind.

[ducksta]

thats what i need got the 21 from last years set up, it was painfull to ride couldnt even keep up with a standard p2

[joeythescooterboy]

On another note, mine lost no top end but gained bottom end on a 28mm, slightly better on go juice too.

[ducksta]

will change the clutch cog first and then take it from there cheers

[paul d]

My 172 ran much better on a sito plus, standard exhaust or scorpion than the simonini. Not sure how the standard exhaust works with a reed but on my worn out rotary it flys!

[joeythescooterboy]

Only just noticed you've got it reeded.......... I'd bin the simmo, it's going to be strangling the poor beast.

[ducksta]

exhaust wise what would you suggest