View Full Version : 1988 2,4 Mercury 200 Carb Motor 2,0 Heads Any Gains,,

08-25-2019, 12:28 AM
Have a 1988 Mercury 200 H.P. On A Bullet 19 Vee. I've Been Out Of the Game For Along Time.And Just Looking For a Little More. For the Son And Myself ..The Boat Runs Good, But Seems Like Theirs More To Be Had. Best It's run Is 66.8 With a 26 Cut Chopper. And 67.8 GPS With a D.A.H. Worked 26 Spinellie.. The Boat Will Only Turns 5700.. I've Dropped To a 24 Trophy And Have Lost 4-5 Off The Top.As It'll Run 62 Or So At 5900.. With Very Good Hole Shot ..The Boat Has CLE Case. And Water Pressure Is 12-14 And I'm 1 1/3'" Above The Pad.My Worry's Is The Comp. at 114-114-112-112-104-104.I've got a Set Of 2.0 Heads And Was Thinking About Bolting These On. Their # Are 1026-5189 Off 150.. Just Wondering If These are worth The Trouble. Thanks. Also Sure I'll Need To Run The 2.0 Head Gasket..

Merc 2.5
08-25-2019, 05:46 PM
Well I would worry about those 104 on 2 cyl, something goin on ,,,but with added compression mite b death of those low cylinders,..... other than that yes it will work fine,

08-25-2019, 06:25 PM
Yep, need to do leakdown test to determine true conditions. More compression will help performance but will kill weak cylinders quickly...

08-26-2019, 12:10 AM
Thanks.. I'm Gonna Re-check And Do a Leak Down. Before I Do Anything Else..

Merc 2.5
08-26-2019, 02:59 PM
Let us know ur findings

90 5.0
11-09-2019, 09:08 PM
Motor sounds weak, should turn a 24 WELL over 6k

And should be able to turn the 26 over 6k on a 19v.

My 2.4 200 “super stock” motor would turn 8600 and we weren’t allowed to do a whole lot to them, a stock 2.4 200 turns 7k pretty easily imo.

01-12-2020, 11:55 AM
Powertune cleaner or Quikleen. You may just have sticky piston rings. That is always the first thing to do.

02-24-2020, 08:34 PM
It's easy enough to replace the rings without removing the power head off the boat . Your still making compression and don't seem to have hurt anything yet . I start by removing the heads and get a good look at the cylinders . If there is no chrome pealing then I would order some standard bore rings , large end rod bearings and rod bolts . Remove the intake ant you can reach the rod bolts from the front half . One at a time , remove a piston , check the ring gap on the new ring and reinstall the piston with the new rings . Repeat this one all 6 cylinder . When your done , then top it off with the 2.0 ( 3 1/8") cylinder heads .

Rich Martin 018