MOPED ARMY

Easiest first : pull the head and have a look .

Get out of that rocking chair , spend 2 minutes and remove 4 nuts . You'll have a better understanding than the guesses you'll get by asking folks from who knows where .

Yep^^ there was a recall on the 78 models with rubber pistons.

Post a pic of the piston and cylinder . ;)

That looks to have soft seized , but , not enough to stop the piston from moving .

Can the crank be turned by hand ?

Oh , that would be a biggg problem . LOL

I'm wondering if something else along the drive train isn't completely up to par .

Yes , very salvageable .

Seeing the amount of blow by , it might be best to install a new set of rings .

That would require a cylinder honing and cleaning the piston and ring landings .

I really think you are yanking my chain on the rubber piston.

Back at it with this puppy. Replacing cylinder with stock kit. Replacing rubber parts of clutch. Would like to reuse rubber dogs for now, I know that's not Ideal but they seem to be in good shape. How in the wild world of sports do I get those dogs back in the outer hub or can I without toasting them? I know about the rivet replacement will use if necessary. Is there any where to get replacement dogs? I've read some of the older post, I'll follow up on that info if necessary. Any info ever develop on using the rubber mounts from a dell computer fan? OH, Cheetachrome no rubber piston, sorry. Ha!

Jay, does that look like normal wear? When I drained the oil it had supper fine black residue, like fine as powder. Oil was heavy more like a 90 weight gear oil. Could that indicate original oil? Everyone seem to be using 30 ND. What do U use for tranni oil? Thanks on the offer, I got new ones from Treats, think i should have stock options in them by now.

why do you call the rubber nipples dogs? hot dog ,caninie dog ,slow dog snoop dog.

Although very difficult it is possible to reuse those rubber nipples. Two hand special crafted dog tools and patience dog.

Fine powder is rubber, get it all out as a few small chunks can sieze your dog clutch bell to your crank. Also dog highly reccommend changing both crank seals dog.

popping them out is easy, putting em back on is the trick.

if you heat the pedal arm(to expand away from the pin) back off the nut a wee bit and give it a resounding blow with a hammer it will pop out, obviously hit the side with the nut/threads down. Not a tap, whack it, mught wanna blick the shaft up for safety.

WOW, burn the house down, had to get those things hot!! Worked great. Be taking my time going forward,Thanks.

Your just a wasting your time, there should be no play up n down at all, post for another crank n top end on B/S. For as deep as those grooves are your, once you hone perfect then you have to go a size up on piston n matching rings,(anyone have one laying around) a flexible ball hone aint gonna do it.myrons page has a great writeup on inspecting a motor.

Just recieved NOS cylinder kit. It appears to be a low compression (red dot) with fiat top piston. The original is a high compression cylinder (white dot) with dome top piston. Any known issues using this replacement NOS cylinder? I also have a NOS Gulp Matic crank, can I use it, since case already cracked open? Reference a prior post,(5-27-2019 by Yugi Trall), it appears the Gulp One Speed crank and VIP practically identical, except for length of a few mm on one side of shaft. Do the Gulp Matic and the Gulp ONE Speed use the same crank? If not any suggestions on who would have a replacement piston roller bearing for VIP crank.