Identify (lake x or xx engine) XR4

[175sf]

Think I have a 2.4 XR4 engine. Years ago Mercury taught us to identify engine by stamp on mid-section or on crank case behind throttle arm. Appears to have vertical reeds and 41 carbs. Engine was off sponsored profess. bass boat. Stamped XX on mid-sect. above exhaust. You think engine is mod. any from factory before I disasemble. Just Curious whether to build this engine to make more power by porting and using horizonal reeds or building a 2.5 to make power. Thanks 175sf

[T-REX]

It soundz like a std steel bore 2.4...Tha xr4 wuz slightly modified from tha factory, and made around 160-165 HP...

If U have a 2.5, build it...Theres nuth'in reel special about a XR4, it's basically a stout 150...It takes more than juss a horz front to make it anythang special...Tha behind tha liner layout iz much more effecient...JMO

[175sf]

Thanks for the info. Will build the 2.5, have already cut and polished the exhaust. Talked to Jay Smith about TDR reeds. Any particular carbs you recommend. Have a set of 200 carbs come off a late 2.4.

[T-REX]

I prefer tha wh-20s........But late model single bowls work good when ya git'em rite..:thumbsup: