Advice for new cylinder head and top end components

Arazzer

New Member
Hello Everyone,

Not sure why (have a couple ideas, will discuss below), but my 80cc "zeda" motorized bike started making some metal noise and bam, stopped running (on my 3rd gallon of gas, fml). I had tried a recommended bp6hix or whatever iridium plug, but that plug protruded too far into the cylinder and got smashed back up, not sure if a piece from the piston got dislodged or what, either way, engine went out and I was left with a giant hill to deal with on my own. I took the top end off and clearly there was some piece of metal causing all types of damage to the cylinder, the piston and the cylinder head.

I now need to replace the top end, and options are abound on the internet. My engine has a stated stroke of 40mm, does that mean I need a special head or what? I saw a CNC head/top end kit from ebay that is $32 (link below), will this work fine? Is there anything I need to do to make sure my crank is fine? After it broke, there was clearly a loss of compression but I could get the motor going again and it helped me out as I made my way towards home.

Working on these bikes is fun, but damn, what a f'ing PITA.

Thanks!

Kit I"m looking at:


Engine I purchased:


Pictures of my bike also attached.
 

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You may want to ask the original seller if all that will fit- there are a lot of variations when it comes to these.
Why do yiu think it blew up? Did it have a warranty?

I have had a lot of these, and even the crappiest ones didn't blow up, ever, much less 3 tanks in.
 
Can you post pictures of the damage?

Did it run lean?

If you run the suggested 16:1 like they keep recommending for break in, and the carb is set just a little on the lean side......you get bad results.
 
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