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Forum: THUNDERCAT RACING Topic: What can be done to improve a 59 cu. in. 40 hp Mercury motor

fs5

Post subject: Re: What can be done to improve a 59 cu. in. 40 hp Mercury m

Posted: January 8th, 2016, 2:49 am

Replies: 23
Views: 24545

theres a thread on brf about the twin mariner/yam , there sposed to make some good power. i live over here in aus , i remember reading about about mertens old dux with the 55 on the old performance inflatables site. it was the old 52ci ! the mertens know how to cut a cleaver good to. dose anyone kno...

Forum: THUNDERCAT RACING Topic: What can be done to improve a 59 cu. in. 40 hp Mercury motor

fs5

Post subject: Re: What can be done to improve a 59 cu. in. 40 hp Mercury m

Posted: January 7th, 2016, 12:46 am

Replies: 23
Views: 24545

has anyone tried a built 59ci merc on a tcat over there yet? i run an 2013 aqua cat with a 55 seapro , got a hydro tech tuner , 3 gaskets between the reeds and manifold and carbon reeds,no porting stock block and interals. we run around 60/64 mph depending on water. our pb is 66.4mph with a lwp . we...

Forum: THUNDERCAT RACING Topic: What can be done to improve a 59 cu. in. 40 hp Mercury motor

fs5

Post subject: Re: What can be done to improve a 59 cu. in. 40 hp Mercury m

Posted: September 1st, 2015, 1:26 am

Replies: 23
Views: 24545

the 59ci 60hp run different port timing . you will need to fit 60hp sleeves and match the ports , remove the reed stops and run the washer style stop + find your self a set of 60hp carbs.

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