za50 making new shift dampners

Alright folks here is a heads up for those kitting a za. After about 20 years or so, those tasty looking red shift dampners in the ZA50 2nd gear main shaft get brittle and fall apart and without them, your tranny will destroy itself. This was the case in a za I recently acquired.

Some fix it by using epoxy and hose or tubing, but I was weary about how any plastic or rubberized tubing would hold up in there so, here is my solution.

1. Buy a cheap latex mold latex mold kit from a hobby shop

2. Make mold of original shift dampner

3. Pour epoxy into newly created dampner mold

3. Let dry, and put new dampners into 2nd gear main shaft

Re: za50 making new shift dampners

Jason Jason Bobason /

What kind of epoxy did you use?

Re: za50 making new shift dampners

I have used epoxy for lots of things, never this. I would be concerned about the hardness and brittleness of epoxy compared to those dampers, but curious about the outcome in actual use.

My friend carved them from old skateboard wheels.

Re: za50 making new shift dampners

The stock one are just as hard as the epoxy ones I made.

Re: za50 making new shift dampners

epoxy when cured is harder than the stock dampners, the stock dampners gives(flexes) a little. the expoxy may crack under stress...heres some other ways to make, find some hard rubber matting or urethane and cut it to shape.

Re: za50 making new shift dampners

Motion Left Mopeds will be selling OEM pucks for the two speed by the end of March.

Re: za50 making new shift dampners

OEM ones or remanufactured ones? If It's OEM I'll pass they have been sitting around just as long as the ones I use to break all the time.

If it's remanufactured pucks I would be interested. I have been experimenting with epoxy of different hardnesses to adjust how the bike shifts, it would be nice to add another option to the bag.

Re: za50 making new shift dampners

do you guys mean urethane resin? seems like that would be much closer to the stock.

this business of tuning how the bike shifts.. that has me intrigued. does it really make a difference? what changes? i dont see how it could affect the shift point, but it could definitely keep you from shredding clutches/cranks/etc.

Re: za50 making new shift dampners

graham the only difference is, it'll shift harder or weaker. the feel(kick) of it when it shifts from 1st to 2nd. it doesn't change the shift point, only clutch spring tension determines the shift point on the second gear clutch...spring tension on first gear clutch determines when the bike engages(like the e-50) it helps on your take off.

Re: za50 making new shift dampners

Jason Jason Bobason /

I agree that epoxy seems too stiff for this application. That's why I asked what kind you were using. I thought you had discovered some new epoxy that isn't as hard as a a rock. Urethane resin, though, hmmm.......

Re: za50 making new shift dampners

if your making it with epoxy and rubber hose...leave the rubber hose on...the rubber gives a little....urethane or hard rubber matting is good....rigid uses the spray on truck lining now thats good stuff...protects against oil and it's flexible and it's strong....

Re: za50 making new shift dampners

hmm interesting. i like the hose idea, i was thinking of doing something like that with hard machined aluminum centers, seeing as i have a huge selection of various hoses at work.

stickin' to my E-50's for now though.

Re: za50 making new shift dampners

We will be selling remanufactured ones. The material is identical to the factory material.

Re: za50 making new shift dampners

Rigid's

In fact the black set pictured in the image is of rubber matting. The set I’m currently using in my 76 is made of commercial spray-on truck bed lining (Rhino lining / Lava lining etc…..). My friend worked @ one of those shops and squirted some of that bad boy into a pie-pan to the needed thickness & cut it out later. It’s impervious to chemicals….. other than that it’s stiff and has held up to my kit.

I use other methods though- never ever weld the shaft & gear together in hopes of solidifying the shift.

link on subject

https://www.mopedarmy.com/forums/discuss/7/33057/33057/

I've been sucking all the Za info. lately

Re: za50 making new shift dampners

I've got some 20mm polyurethane rod I'm going to make mine from.

Re: za50 making new shift dampners

devin that's cool...you folks are manufacturing some. hopefully it holds up better than the OEM. normally the OEM dampers doesn't hold on kitted bikes and peeps who has clutch work done on their ZA's...OEM will hold for a little bit, but eventually the dampers would just get shredded. when the bike shifts, with higher stalled clutches + kitted, will produce some great amount of torque and the dampers absorbs that torque while it shifts to second...and without good solid stiffer dampers kitted bikes would shred those dampers. for over 15 years we've been making it out of different material that'll hold up, against faster bikes, and absorb the torque. hope others have other ideas on making stiffer dampers....i use hard rubber matting in my za's and those have lasted me quite some time now. IMO polyurethane material is best. www.urethane.net could probably make some not sure of their prices. i'm sure there are others than can manufacture these. or if anyone in MA can make these out of polyurethane, let us know.

Re: za50 making new shift dampners

West Seattle uses 3 nickels brazed together.......breaks main gear teeth on shifting.

Re: za50 making new shift dampners

the nickels are way too stiff, need something a little more flexible....something that'll absorb the impact of the torque and hold without falling apart...the nickels probably doesn't absorb that good at all...hence the shredding of the gear...

Re: za50 making new shift dampners

from what i have heard, the MLM remanufactured pucks are made of the same material as the original O.E. puch parts, and they havent been sitting in gear oil and under compression for 30 years.

za50 new shift dampners

The new ZA50 pucks from Motion Left Mopeds will be available soon, please respond with your interest and how many sets(3 pucks) you will need so we can have enough for everybody.

Re: za50 new shift dampners

I keep thinking you guys need to look at VW parts for cheap urethane.

Re: za50 new shift dampners

anybody ever look in to lexan/polycarbonate. that stuff has a surprising amount of flex, yet is super stiff. you can buy rod, tube and sheet in all sizes pretty easy. maybe slices of tube, and you could dial it in using different tube i.d.'s (different wall thicknesses)

just throwing crazy ideas out there

Re: za50 making new shift dampners

fhkqdude Sabatinelli /

Hockey pucks covered in an oil resistant coating after cut to size.

Re: za50 making new shift dampners

Driving down the freeway, saw a recap by the side of the road and wondered: Would recap material (especially those large squarer areas on the edges of big truck tires, don't know the technical name) work for carving dampers? Hard rubber, but not too rigid, durable. Just wondering...

Re: za50 making new shift dampners

id be into a few sets,i just finished making a solid motor from 7.im tired of having to peg my rpm's to let off so it'll shift

Re: za50 new shift dampners

I'd be down for a set.

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