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Thread: ox66 250 efi mods
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02-03-2016, 08:07 AM #1
ox66 250 efi mods
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02-03-2016, 11:48 PM #2
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02-04-2016, 12:45 AM #3
You may get better bang for the buck tweaking your setup. Setback, prop testing / mods, etc.
If the motor needed rebuilding you could make some more power to go faster but most of the bolt on stuff will maybe make it accelerate a little better.
I would spend the money on props and maybe a jackplate.13' Biel tunnel AKA "Flight Risk"
13" Modified Yamaha V4 - 101 mph
21' Paramount
Mercury 300 Promax
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joneill liked this post
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02-04-2016, 06:52 AM #4
I agree with demeanor.
work on setup and props. Much to be gained thereFormula 260ss 496HO
Bender Clan Member
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02-05-2016, 09:21 PM #5
Leave it stock....play with setup and just go boating....
1984 28 ghost twin 200 Yamah ProVs (SOLD)
1997 21 Superboat Legend 250 VMAXXX (SOLD)
2001 25 Concept CC 250EFI (SOLD)
2002 24 Superboat Step 250EFI (SOLD)
1997 21 Checkmate Pulsare 200EFI Merc (Beater Boat)(SOLD)
1994 20 Hydrasport 225 Optimax (SOLD)
1998 27 progression Twin 225 Mercs (SOLD)
2005 23 Kryptonite 300 Promax (SOLD)
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02-05-2016, 09:23 PM #6
That boat is similar to my 27 concept I had....With a healthy 250 merc properly set up it ran 60 to 62 at any time....when i first got it with the wrong prop and crap setup it only did 54.....
1984 28 ghost twin 200 Yamah ProVs (SOLD)
1997 21 Superboat Legend 250 VMAXXX (SOLD)
2001 25 Concept CC 250EFI (SOLD)
2002 24 Superboat Step 250EFI (SOLD)
1997 21 Checkmate Pulsare 200EFI Merc (Beater Boat)(SOLD)
1994 20 Hydrasport 225 Optimax (SOLD)
1998 27 progression Twin 225 Mercs (SOLD)
2005 23 Kryptonite 300 Promax (SOLD)
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02-06-2016, 07:14 AM #7
you can tweek your engine... but best gains are in set-up...just like the above guys mentioned
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02-06-2016, 11:14 AM #8
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ghost28 liked this post
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02-06-2016, 11:22 AM #9
The problem I have is I have a parachute for a t-top and trying to push it faster I feel I need more horsepower. I run a merc Mirage 19 inch pitch prop on it the big round ears give me good bow lift have gone 52 with that prop before I lost it.shaft nut came off
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02-06-2016, 02:23 PM #10
Mirage prop is crappp....old school technology....that boat will wake up with a Merc Rev 4
1984 28 ghost twin 200 Yamah ProVs (SOLD)
1997 21 Superboat Legend 250 VMAXXX (SOLD)
2001 25 Concept CC 250EFI (SOLD)
2002 24 Superboat Step 250EFI (SOLD)
1997 21 Checkmate Pulsare 200EFI Merc (Beater Boat)(SOLD)
1994 20 Hydrasport 225 Optimax (SOLD)
1998 27 progression Twin 225 Mercs (SOLD)
2005 23 Kryptonite 300 Promax (SOLD)
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02-06-2016, 03:51 PM #11
with 4 blade do you keep the same pitch or go down 1
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02-06-2016, 05:42 PM #12
How many Rpms are you spinning that mirage?
21 SuperBoat VF200 Yamaha SHO
Bender Clan memberEroshibend Yamamoto
2015 King of the Cut
2016 King of the Cut
2017 King of the Cut💪
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02-06-2016, 07:05 PM #131984 28 ghost twin 200 Yamah ProVs (SOLD)
1997 21 Superboat Legend 250 VMAXXX (SOLD)
2001 25 Concept CC 250EFI (SOLD)
2002 24 Superboat Step 250EFI (SOLD)
1997 21 Checkmate Pulsare 200EFI Merc (Beater Boat)(SOLD)
1994 20 Hydrasport 225 Optimax (SOLD)
1998 27 progression Twin 225 Mercs (SOLD)
2005 23 Kryptonite 300 Promax (SOLD)
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02-07-2016, 07:15 AM #14
trimming up a little i can get 5500 out of it
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02-07-2016, 08:38 AM #15
Give Ken at PropGods.com a call and see what he thinks. Tell him Mr. Demeanor (Chris) sent you his way. He will talk to you about props and has a testing program. Probably already has data on your boat.
Dont discount that MIrage Plus. Its the fastest prop on my Fountain and we have tried them ALL and at different heights. They do respond very well to a little work including some extra cup.13' Biel tunnel AKA "Flight Risk"
13" Modified Yamaha V4 - 101 mph
21' Paramount
Mercury 300 Promax
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