Chip tuning outboardsJesper 03 March 2002, 07:08 Does anybody know if it is posible to chip tune/rebuild a 150 hp Mercury EFI to 200 hp ? If it is posible what parts do I have to change ? Jesper niels 03 March 2002, 11:56 No that is not possible. it is an other engine. from 135 to 150 is possible but very expensive. 200 to225 is also possible. greetings niels from holland. Garygee 10 March 2002, 18:53 On this subject, how easy is it to mod the Mariner 50 HP 4 stroke to the 60 HP ?. I know its the same cc, block leg etc. Anyone know if its easy done and what needs changing to make it a 60 HP. Thanks Gary JCW 10 March 2002, 19:36 Gary, Check out Marinepower.com technical forum. Apparently it is just a matter of taking a plastic stop out which restricts movement on the carb butterflies. Garygee 12 March 2002, 20:20 Thanks That even sounds like a job I could do. :D Jono Garton 12 March 2002, 20:26 Anyone got a trick like this for a Yam 50hp 4 stroke |