Modern Vespa

Subject says it all. Despite all the various fixes it always comes back and I'm tired of it. Impressions of alternative clutches appreciated.

I'd been looking at the Malossi adjustable clutch, not sure whether to believe the blurb.

http://www.recambiomotos.com/malossi-clutch-adjustable-vespa-granturismo-p-1516.html?language=En

I guess you've done the usual compressed air blow out of the dust + clutch cleaner and the clean out of the filter on the clutch cover. Air scoop?

Best thing I've found is a Malossi Torsion Control.........
https://www.google.com.au/search?q=malossi+torsion+controller&tbm=isch&tbo=u&source=univ&sa=X&ei=__hGU6rKDI7l8AXDqYDQCg&sqi=2&ved=0CCcQsAQ&biw=1302&bih=908
........seems to reduce the shudder even when dirty.

Have you tried Dr. Pulley sliders?

Sliders are variator pieces, nothing to do with the clutch and will do nothing with regard to the clutch slipping.

The only sure remedy is occasionally removing the clutch bell and cleaning it as well as the clutch pads.

On the topic of aftermarket clutch assemblies, or bells that may help. The Dr Pulley HiT clutch is adjustable with springs and pillows that lock the arms in place once engaged and it helps with the clutch slipping. Also the inner surface of the Zelioni clutch bell is textured and resists the slipping as well. Those two items are the best remedy to be purchased at the moment.

i've had good luck with the polini "max speed clutch" #249.025 and a fresh bell. the polini unit looks like a stock piece, but much beefier and better built.

try changing your bell first, it may be warped...

-g

I like my polini bell for my 500 alot, it has very large vent openings, weighs 1/2 of oem, has grooves on the outer surface acting like cooling fins. All which help keep it cool as heat is a major downfall for clutches.

OP did not say the clutch is slipping. He said "shudder." I took that to mean a shudder on take off. Actually, if the clutch is slipping, isn't that still a smooth acceleration, just slow?

And I did not read an answer to my question about Dr. Pulley sliders.

The best way to stop the shudder from coming back after thoroughly cleaning and sanding the clutch is to adopt a more aggressive riding style.

The worst thing you can do is to apply minimal throttle during takeoff. This just causes a prolonged period of slipping because there are barely enough revs to keep the clutch engaged. Slipping causes overheating with resulting glazing and more dust from wear... which is what causes the shudder.

Applying the throttle aggressively when launching engages the clutch positively and minimizes the amount of time the clutch can slip. Don't fear, it's just a Vespa with 11-18 hp... you aren't going to lay 30 feet of rubber on the road or pull a wheelie.

I've had zero clutch shudder since I learned this little fact of life many years ago.

Thank a lot guys, I'll look at the options mentioned.