Modern Vespa

at 52 its getting harder to pull the clutch handle in.....all because of stronger springs, 4 plates. banded baskets 22 teeth that I installed through my 40s to harvest power from the tuning bug

Twas thinking of devolution using a stock standard clutch and springs in a dr177 tune and then thought someones had prob done it already

will it slip?

COSA II clutch, 4 stock springs & 4 SIP "L" springs, CR80 plates and it's like butter on my Ratty longstroke PX200. If you want to take it further, the MRP "adjustable" actuator will help even more...

OK, first thought that popped into my head....

Are we not men? We are DEVO!

Which actually stood for de-evolution

[img]http://stmedia.stimg.co/ctyp_devo_press.jpg?w=800[/img]

DR177 does not need anything but a stock, 6 spring clutch. It will not slip.

https://beedspeed.com/products/vespa-clutch-easy-clutch-full-kit

I've knackered hands/wrists and stumbled on this whilst looking for future mods due to health

Woops..should have mentioned its VBC cases so PX 200 clutch wont fit (even tho I have ground away the oil channel in the clutch cover to accommodate the banded basket (smaller diameter clutch to PX)

yo ruffstuff...I could not see any deets on the easy clutch..how do they achieve it.....physics and fulcrums on the lclutch cover lever?????

https://www.aliexpress.com/store/product/For-HONDA-CB-500X-500F-CB500X-CB500F-2013-2016-Motorcycle-Accessories-Aluminum-Stunt-Clutch-Easy-Pull/1669337_32674974721.html

Worth a try!

I'm using a stock Cosa II in my PX/DR177. It operates perfectly and is a breeze to use. It's my city scoot, as none of my other PXs are welcome in central London any more (ULEZ). The light clutch is a real bonus in traffic, combined with the peppy pull of the DR.

I presume it's a cable guide/ in there so you pull cable 1 and it makes cable 2 do more work, like a problem solver for a mtb mech, only guessing tho

Yep, it's using the mechanical advantage of a fulcrum. Move the center of effort out from the pivot point and it multiplies the force exerted.

Cosa clutch fits fine in my VBC case. It's the banded SIP Sport type and case is 1976 VBC. Like Sprint V or early P series, but with old crank + bearings setup.

MRP's lever...

https://www.mrp-racing.de/Clutch-lever-adjustable-Vespa-PX-T5-Sprint-Rally

https://www.youtube.com/watch?v=NFMusjnm24g

Crimaz makes a push rod clutch that is supposed to be great. It's available for about $60 and available from SIP. You could also go with a hydraulic clutch.

I assume you have tried a dogleg lever.

Grumpy

Do you know anyone who has installed the Crimaz push rod on a smallframe?!

I know someone who was going to install one on a race bike. Let me check in with him to see if that ever happened. I have doglegs on both my bikes and while they do allow you to get more grip on the levers, they definitely don't make them any easier to pull.

Also, to the OP, do you pull the clutch in every time you shift?

I know they make one for a Smallframe, but I've never heard of one for the largeframe. Do you have a link?

I think that they do for me. I know that they don't add any mechanical advantage like some of the solutions posted, but they do allow me to squeeze in a position where my hand is more fully closed and my fingers aren't reaching so I think I have more strength there. Works even better with adjustable doglegs because it's so easy to find the sweet spot.



Also check to see that you clutch cable OUTER is not longer than necessary. Too much extra outer means S curves inside the tunnel which can increase friction considerably, especially if starving for lubrication and the longer the excess, the tighter the S bends.

I have, but haven't tested it yet. https://www.sip-scootershop.com/en/products/push+rod+crimaz+clutch+geared_87724000

Thank you Ginch, me likes!!

Exactly. And if it slips, the springs are to be replaced, withnoeigonal ones.. Always! Use the weakest possible spings to protect your big clutch bearing.

the torque on a large frame clutch is rather low compared to motorcycles, smallframes, and lambrettas, since it rotates at crank speed and the gear reduction comes after it.

but, if it slips adding plates instead of stronger springs will address it without making it harder to pull.

This guy is totally onto the light clutch.

Unfortunately they don't make them for vespas, but the idea is transferable if someone has the engineering skills.

https://www.clake.com.au/onelightclutch/

I currently have those OLC Clake clutches on three of my KTM’s. There’s definitely pros and cons to them.

You could install a Liztor hydro clutch cover, them fab up a mount for the OLC clutch master cylinder. I can’t remember exactly what the piston bore is on the Clake unit though...I think it might be a 9mm?
https://www.kytronik.com/products/cnc-hydraulic-clutch-cover-for-vespa-px-cosa

How can that be achieved? WDC what are the downsides, and if using your suggestion would they be present as well?

the holding capability is proportional to:
pressure of the springs * Number of plates * diameter

the pulling force is only proportional to:
pressure of the springs / leverage

so if you buy a 4 plate set and don't use the heavy springs you get 33% more holding force with zero added pulling force

Did this on our yellow smallframe (that is still for sale)

I'm quite sure 9.5mm is the piston size.

If you have any concerns with the OLC, I'd encourage you to email/call Owen (the manufacturer). He's super approachable and I'm sure he'll try and help you out.