Modern Vespa

Hey everyone,

I'm in the process of restoring my T5 and been thinking about upgearing the clutch since that is a common recommendation I have been reading.

I've read that if I ran the stock set up, or a polini or malossi kit, a 21 tooth clutch with stronger springs (or a cosa clutch with 21 teeth).

There has been some mentions of a 22 tooth clutch gear but unsure with what kit to pair that with.

Any insight? Recommendations?

I am essentially looking for a T5 that will gain some torque and be able to manage hills (areas where the T5 lacks) with the clutch up gear.

Thank you!

I put a malossi 172 on mine weeks ago and I ask on here what tooth clutch to use and I was advised to use a 21 tooth clutch so I got a cosa 21 tooth clutch with malossi clutch kit for it.

Kudos. How does it ride? I read your posts and watched your videos regarding the jetting. What did you end up with? What pipe are you using?

it depends on the riding you're doing. I think a 21 is a flat out necessary upgrade unless the bike is going to be city only and a 22 is nice if you're skewing more toward touring.

the problem is that with a stock T5, the power band relatively narrow and you need the revs to get there so you want that lower gearing to make use of it.

if you need torque for hills, a clutch isn't going to help. you need more displacement or to tune the stock barrel.

skip the rest and go straight for the malossi, you won't be disappointed.

go cosa over traditional 7 spring. your hand will thank you, and the clutch will live longer.

Thanks for the response, greasy. I always appreciate your replies.

I envision myself doing city rides/ some day rides with minimal hills. Pretty flat where I live.

A day on some hills won't kill me. It's not like I'm riding the Smokey mountains daily.

If I made this bike a rally bike, then a 22 would be the best choice, correct?

It got a simonini exhaust at the moment but I have got a sip XL exhaust coming. As for the test riding to get the main jetting right it's gone tits 😆 I got to do it all again because I did an oil change the other day and the oil what come out was very low. I haven't notice any leaks over the months. I put new oil in and started it up then it was smoking a lot so by the look of things it's got a leak inside. Sucking oil into the crank and air leak so the jetting is wrong. It could be the gasket around the crank or the main seal I will replace them both. I've got a main seal for a T5 and I have ordered a gasket set so I will sort it out next week.

maybe, it depends on your setup-- kit, pipe, carb.

you can't really go wrong with the 21 or 22, but the 23 is absolutely only for top speed, flat or if you have a monster of a motor to pull it.

I'm leaning towards stock w a sip XL or road 3.

Or a polini with a sip road 3.
Both with stock carbs that are up jetted.

Mines got a standard carb but I have drilled the hole bigger in the float chamber where it goes to the main jet with a 2.5 drill bit. The sip XL exhaust is one of the best exhaust to use on a T5 with a malossi.

Out of curiosity, what kind of speeds are you obtaining? Not necessarily full throttle, but comfy cruising speed?

I've only done upto 50 mph because of running in the kit but it goes from start to 40 mph quick in 2rd. I will mostly do 40 mph for now. I will find out top speed soon after I have done 300 miles.

shepys:

an oil sucking engine is the worst. especially if you are chasing multiple areas. I think freakmod does a youtube video on this. When reassembling, use liquid gasket on everything,: except maybe the clutch side seal. lol

Good luck with the reassembly.

Brilliant guy I watch him a lot. I watch them videos before but I watch them videos last night in bed. I think I did the problem with too much sealer. It done my head in thinking did I use sealer or didn't I so I got out of bed to have a look and I can see I did use it.I think I use too much. I've finished a p200e I've been doing in my man cave I've only got the carb to sort out then I'm taking it off the bench today and putting my T5 in then I will make a start on it. Be great if the gaskets come today I will have it finished by tonight