Crazy Moped gy6 50cc 139qmb Insane head work done

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Milling of the head
chamber Softening
head porting
valve work
seat work

@MOPBOYZ
  1. Dillon racing
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I took the stock engine out and threw a brand new 70 cc piston in this old scooter i had , i already had a 70 cc cylinder to spare, then i got rebuit a big bore head with some new valves to replace the stock head and then chopped up a 110 cc crotch rocket exhaust that has 2 mufflers on the pipe and added adjustable carburetor...but I got a oil leak...so I gotta patch that up

thundercatt
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How does taking material away from the combustion chamber add compression? I'm pretty new and must have missed something lol

evidentloss
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How has this build turned out? I'm doing a similar build

gennygauck
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Why would you make the port bigger than the valve seat?

gonewronggarage
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but you used still those small valves? I dont get it.

rallyscoot
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It doesnt make sense to do such a job, if you can get the right 72cc better head in the store. 50cc and 63cc doesnt require that kind of `tuning`.
And such a head doesnt seems to work on everything lower then 72cc.. Because then you loosing compression due to much room in the fuel and exhause channel.
I already did ever installed a 72cc head (saying it was for 50cc) on a 50cc cilinder... Then the engine didnt suck fuel on, so didnt want to start or idle.
When replacing with a known good stock head, the engine was running again. So opening up (of make bigger channels isnt always the best to do)

rallyscoot