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Heads and Cylinders All about your porting, compression, rings, cylinder and piston modifications to your bicycles engine

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  #1  
Old 04-16-2017, 09:32 PM
shiveralex shiveralex is offline
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Default 49cc High compression head

I cant find anywhere (except gasbike for like 90 dollars) a good 49cc head. anyone got links?
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  #2  
Old 04-20-2017, 11:33 PM
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Cylon Cylon is offline
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Default Re: 49cc High compression head

I don't know of any, if you remove the head and sand it down a bit it will increase compression for free. I'm sure there's tons info in the forum about it somewhere.
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Old 04-21-2017, 12:41 AM
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MotorBicycleRacing MotorBicycleRacing is offline
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Default Re: 49cc High compression head

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Originally Posted by shiveralex View Post
I cant find anywhere (except gasbike for like 90 dollars) a good 49cc head. anyone got links?
There is a good and inexpensive moped head that fits your 48 cc.

Sold by treatland.tv
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Old 04-22-2017, 11:56 AM
KCvale KCvale is offline
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Default Re: 49cc High compression head

Just put in a $9 NGK 5944 (BPR7HIX) Iridium spark plug.
It's longer and better than stock and will give you about the same performance increase as a new head for that little 48cc 2-stroke, an expansion chamber exhaust will help the most though.
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Old 04-24-2017, 12:56 AM
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Tyler6357 Tyler6357 is offline
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Default Re: 49cc High compression head

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Originally Posted by Cylon View Post
I don't know of any, if you remove the head and sand it down a bit it will increase compression for free. I'm sure there's tons info in the forum about it somewhere.
Well, usually you sand the cylinder down to decrease the squish gap and increase compression, this is known as "decking" the cylinder. You don't usually sand down the head.
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