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@@James-l7z5z rings and piston

@@backyardrestorations What the size of the rings

@@juantika6087 just be safe and don’t over rev.

@@backyardrestorations I’m having an issue on mine right now where it’s held at wide open all the time do you know what this could be

@@juantika6087if you have a aftermarket carb I’d tune it that can be the main problem

The rest of the 21k people don’t have a problem.

It has a 77cc kit

That’s an excellent point

One more problem with doing business with communism is after some USA/Europe dupe has their product made there, the commies have been known to make extra parts, and under cut their own business partner on line. communism makes terrible business partners.

I had no reliability issues with this specific setup.

@@backyardrestorations Thanks for the info man My mate Jeff Cope has just bought this I believe

Good luck

Try eBay

@@backyardrestorations already tried

I bought mine for 1200 but I could Easily get 2500 or more. Depends on condition mileage and mods.

I used the head stud as a slide hammer

@@backyardrestorationsthe head stud bolt doesn’t even fit into the rocker pin threads?

@ianhort2033 okay you have the newer one. An m6 bolt will work fine with a little heat as well.

Yeah those Chinese cylinders won’t ever make any power. Get yourself a minarelli vertical kit. That’s what this engine is. Minarelli AM6

@@backyardrestorations The non dud 49mm can make decent power 45-47mph top speed for the price ($35 top end kit) On my current bike I'm only looking to go 40 mph but still keep some bottom end power. Once I get a strong steel full suspension bike frame built and stronger wheels. Then I'll be willing to get better motor $.

Get a Boyesen rad valve, they made my bottom end amazing!

@@backyardrestorations I'll be happy with my motorized bicycle once I get the dud 49mm port trimmings straightened out. Most people were able to just grind away the iron overhang casting on theirs without doing any port trimming work and they ran good. I'm running a reed valve now coz it had major carb spitting. I did a window piston, intake boost port & 3rd intake transfer port. Once I get bottom spacers made installed to fix transfer port trimming. It should run good. My 47mm jug runs good, gonna try and copy its measurements/ port trimmings onto the 49mm. The reed doesn't really make any more power than piston port on the China mb (unless all port work done perfectly to proper numbers and angles) but does improve mpg and get rid of carb spitting. Wish I had a degree wheel and knew exactly what trimming and angles to port everything to.

@@michaelbrinks8089 make yourself one out of paper. It works just the same.

Good config! Is it the powervalve athena cylinder kit?

No just Athena 6 port kit

@@backyardrestorationsathena 80 ?

Isnt the carb a bit on the larger side?

Pretty sure. Just make sure there isn’t any slack.

It’s 300 and you can get it at harbor freight.

A big carb like that is good for constantly WOT applications like mine.

@@backyardrestorations yea it's not good to hold these 2 stroke bicycle engine at wot for long

It’s a disposable engine.. who cares. I would see it that way if you dumped a bunch of money into it.

@@backyardrestorations I don't just buy the cheap ones for 130 bucks. I just got a zeda 80 for a different bike and it's almost broke in and I already have a high performance head and exhaust for it along with a ported cylinder and windowed piston and reed valve so when I get it together I want to get it tuned and get a few hundred miles on it before I just blow it up

@@Westhelockpicker there’s also a difference between WOT and high RPM.

I believe I was using 130

@@backyardrestorations I have the same carb on my bt100 but when I go full throttle it just cuts out I tried going leaner and then richer but can’t seem to get it right with the jets that came with the kit. Please help

It’s been replaced.

These engines don’t even make enough vacuum to utilize the power jet so cutting it out won’t do anything.

@@backyardrestorations yes it does it works

That is for sure

I definitely overpaid. I bought it for 400 needing a top end.

@@backyardrestorations Eh that's still not bad though. And gave you an excuse to tear into it

Thx

I was joking

So was i

@@backyardrestorations about what

Oh really? I own an am6 also!! Did you feel any power difference? I have malossi carbon reeds now. Do you recommend I switch them out?

@@backyardrestorations i can't say i noticed a power difference as i only ran that engine with the fake reeds, But should indefinably flow better than the stock reeds and less power then a real Vforce as the quality is not great and the reeds are cheap and thicker material

@@backyardrestorations But yeah i wouldn't really recommend putting it on an engine you really care about as they could break

@@backyardrestorations Benice my video

Huh

Wdym?

@@backyardrestorations Well, he's one of the few reaching 57mph. ( verified) And he modified his reed valve, and some of us jumped into that bandwagon... Beautiful tale of mad science and speed.

Oh nice. Are we talking about motorized bikes?

@@backyardrestorations Always.

Oh okay yeah those are cool. Thinking about getting into it again.

www.ebay.com/itm/295186481555?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=be_fsqvttlg&sssrc=2349624&ssuid=be_fsqvttlg&var=&widget_ver=artemis&media=COPY

I’m glad you liked it

I wouldn’t recommend the carb to be completely honest. I’d rather you go with a mikuni VM18 much higher quality and much more appropriate for a 66/80cc engine. What mods have you done to your bike?

Spark plugs don’t do much of anything. You should upgrade your exhaust and head before you even consider carburetor work.