MOPED ARMY

Originally thought same that 90psi seemed low but manual says 6:1 which is roughly 88.17 as acceptable spec for compression.

I’ll be checking the oil pump to make sure its not sticking when throttle is off and sending more oil into the carb.

Everything is stock on the bike and prefer to keep it as close to stock as possible knowing cylinders are most likely going to need to be aftermarket.

I’ll have to take the cylinder off to fix the jb weld on the exhaust port and what I suspect is probably a broken exhaust bolt so I’ll check for pitting when its off. Would also be a good time to just swap it out entirely. Amazon has a kit made by Niche but not sure if its any good.

I find Niche products to be of good quality .

I've used their bearings and such with excellent results .

I bought a piston kit for my FA50 . Very nice product .

One of our members bought a $40 Amazon 60cc kit for his FA50, and it didn't even last 20 miles before a huge chunk of the nikasil plating broke off and trashed it.

Whoops, yeah I meant 60cc on the chinese kits.

Just did the crank seals. Pretty easy and there are some youtube vids out there on how to do it. It wasn't any fun taking the ignition side apart (make sure you have an impact screw driver), but overall not too bad. I think on that side you can put a screw into the seal and then use a pliers and yank it out.

I'd really like to find the real Yamaha YT60 top end (60cc) but seems like those are pretty hard to find in reasonable condition these days.

Here is the exhaust to cylinder situation… looks to me like jb weld. That being said, i doubt I can take the cylinder off with exhaust attached due to the muffler hitting the crank case on right side. Can I hit that with a propane flame long enough to scrape off the jb weld or will it ignite oil/gas?

I think I would try grinding away the excess and see if it won’t pop off. Maybe a few light taps with a hammer.

A possibility with the excess smoking is oil being pulled in from the transmission past the crank seal.

Buy the flywheel puller. I believe there are cheap options on Amazon that work just fine.

If that’s JB weld, just hit it with a chisel. JB weld is strong but like a rock, it’s brittle. If it’s welded on you’ll need to grind, cut, etc to remove it.

Find all the parts you need and then some at treatland.tv

woof, looks like someone actually welded it to the cyl. i would just pick up a new pipe if you have the cash to spare. if not, im sure you could get a used stock pipe on b/s for like 20 bucks

Yeah its nasty. Started grinding it but looks like a storm is headed this way. Will pick it back up again Sunday.

Ive got a grinding and cutting wheel for the angle grinder and also cutting disks for the dremel once all the major stuff is gone I might cut a line with the dremel and see if it will break loose. Hopefully the weld isn’t between the exhaust and cylinder. If they just did around the front edge that should come off.

Used a grinder with grinding wheel to beat back the weld then dremel with cut off wheel to cut a groove/channel above the exhaust. Kept working on the groove and it popped off. May have to double up on an exhaust gasket when I put it back on but otherwise should work.

Heres a close up of the top after cutting it off. Looks like maybe a gasket was there too? I’ll have to see about getting a new gasket for it. Otherwise its got enough meat left to make it work.

Yeah its a damn mess. The cylinder actually doesn’t look all that bad inside but I ordered a new one with new piston and ring set anyway. Along with new exhaust gasket and bolts.

Yeah thats the plan for now. Do those old gaskets have metal rings around them? Seems like some sharp thin metal on the edges.

Good call. Getting a good seal on that mess of an exhaust interface would be way more trouble than it's worth. That's probably why they welded it on in the first place.