have 150 evin crossflow 150 1981

Benny1963

Lieutenant
Joined
Sep 17, 2006
Messages
1,476
motor runs good it is the sport model which i think is just a sticker
have some evin 175 heads same year what parts are used to get the 175hp
or 200 does the piston size change or is it reeds carbs heads and timing changes just curious if your out there d hadley would like to know what i can do to get hp up and what can i get out of some boysen reeds and what shoul i jet to if i use them stock 150 crossflow .
thanks b1963
 

Dhadley

Supreme Mariner
Joined
Feb 4, 2001
Messages
16,978
Re: have 150 evin crossflow 150 1981

The 149 cid 150 and 175 were the exact same powerhead. The 200 has different port timing. Same crank, rods & pistons. The best heads for a recreational motor are the 150 XP/GT heads. Boyesen reeds will improve acceleration and help top rpm once you reach 6200-6300.
 
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