New 80cc and cylinder head cracked


New Member
Aug 12, 2021
I got a new 80cc 2 stroke bike kit and my bike was stalling out and I had to keep the engine well revved up so it can stay alive. At one point I just couldn't get it to start and I took off the cylinder head and I looked at it and saw a massive crack in the cylinder head. keep in mind I probably only have about 10-15 miles on this bike and I used a 16:1 oil/gas mix. I'm assuming that it's just a defective head.

My question to you guys is... can i get an aftermarket performance cylinder head? Keep in mind that I am still in the break in period. If yall do think I should just get a better head than the stock one than what would you recommend?

Venice Motor Bikes

Custom Builder / Dealer/Los Angeles
Mar 20, 2008
Los Angeles, CA.
Honestly... the stock heads work fine. torque the head to 12 ft/lbs , (or it will warp & cause a head gasket leak)

Don't use 16:1 oil mix... that's antiquated advice... use 32:1 for a few tanks, then switch to 40:1