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melloyello · 12-24-2006, 08:26 AM

Since you have the lifan head and you have bored it I would say run the biggest darn thing you can. Go w/ the 4.1 or get a CHP. Adding just the Ultima on my 131 gave me .3hp more over the pipe I was running.

12-24-2006, 08:26 AM	#2 (permalink)
melloyello 3rd Gear Member Join Date: Jan 2006 Location: williamston, nc Posts: 3,485	Since you have the lifan head and you have bored it I would say run the biggest darn thing you can. Go w/ the 4.1 or get a CHP. Adding just the Ultima on my 131 gave me .3hp more over the pipe I was running.