Yamaha pw50 eBay top end piston cylinder replacement issue! Must watch before you buy. 

Good to know this is exactly why i keep oem parts!. So it sounds like oem head re-surfaced + china cylinder is the ticket 🎟

I put an amazon top end on my sons pw, it had an amazon big bore but i wanted to bring it back down cause he was 5. So last week he was done riding, so i rode it up to the garage with me and him on it, about 100 feet. Piston came to a stop in the cylinder. Let it cool down it was fine. Now i gotta kick it a billion times to get it fired up again. Thats the condition it was in when i bought it. He has rode it probable 3 times since i did the top end, but right from the rip it sounded like it was rubbing in the cylinder. Kit was kind of junk but a complete cylinder and head that are oem are like 3 bills lol.

Thanks for taking the time

I'm thinking maybe faulty from factory. I've never had such liw compression using Chinese parts. Im tempted to put genuine cylinder head to see if any difference. Under 100 i wouldn't be happy or recommend using company it came from. Have a good one and stay safe bro

Little trick on all 2 stroke gaskets especially head gaskets , case and other main gaskets . Coat the gaskets in yamaha bond = zero air leaks .! .

Thanks I just purchased a ebay cylinder and head piston kit I guess I'll reuse the original head

I didn't think anything would start easy being under 100psi. For a rebuilt top end id expect higher

That cylinder looks awfully shiny. Don't you have to hone it to get the rings to seat?

Great stuff!

Exhaust port looks very “square” in the aftermarket cylinder. Is it the video/shadow or was it ported?

Hey do you know about the Yamaha 4 zinger

I dont think my 7 year old is gonna care haha......But cool