49cc High compression head

Cylon

Member
Jun 26, 2015
346
9
18
Maine
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.
 

KCvale

Well-Known Member
Feb 28, 2010
3,967
53
48
Phoenix,AZ
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.
 

Tyler6357

Well-Known Member
Mar 15, 2012
1,143
170
63
Santa Barbara, CA
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.