Skeeters 200HP to 250HP build

[wrechin2]

I recently built a 94 200 Johnson for Skeeter's 20' Javelin. The engine started out as a 94 200 with a LOT of potential. These blocks are known the be very crappy as the casting (slag) in the ports are horrible from 1994 to 1997. There is a lot of restriction in flow as the ports are partially block as you can see from the pictures. </p>

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Here is what was done on the build.</p>

1) Engine was ported to 250 specs (1.710) and widened to match the block.
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2) Ports were cleared of a LOT of slag</p>

3) The block was decked .018 to clean up some of the pitting from water corrosion. We went back with the 1993-back head gasket which was .012 thicker than the original gasket, so the squish band was only decreased .006 from factory specs.</p>

4) Added 225 H.O./ 250 Carb bodies and throttle plates and jetted .003 above factory 250 jetting specs. </p>

5) Replaced all 6 pistons as 3 were the wrong size and they were Wiseco 30 series piston that are a ticking time bombs. </p>

6) The idle reliefs were plugged off. This helps to increase bottom end torque, which when raising the porting will result in bottom end loss. </p>

7) Replaced steel reeds with fiberglass reeds for safety of engine and smoother idle.
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The engine would turn a 24 raker to 5200 RPMs @ 62.4 GPS with the hydraulic jack plate tweaked. The modified engine is alot stronger now that we got the bugs worked out of it. We used the 94 air box and it was very restictive. We then modified the air box to allow more air it ran a lot better.</p>

The engine now has 6Hrs on break in and will only get stronger. The hole shot is already stronger. He ran it today with the 24 Raker with a short burst of 10 seconds it ran 73.3 GPS !!!! The hydraulic jack plate is all the way down so there is even more to be had, as this boat has the potential to be in the high 70's and possible to knock on the 80 MPH door , that is not bad from 62.4 GPS of what the boat previously ran! He is a very happy camper and is like a kid with the key to a candy store. emoDance emoDanceBut he claims it is Hungy and wants to emoHungry some Mercs...........We will just have to see. LOL!!!! emoToast emoToast
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[bass15]

NIce work James.Your to smart! lol.My Promax burnt up another voltage regulator.Gonna check it out later and see what the deal is.I hope this motor work good for him

 

[soddyboy]

wrechin2 NEED HELP ! Please call me at 423-653-2654

 

[wrechin2]

Eric, That can get expensive. If it is the same regulator, then it might be the stator shorting out. It may be CHEAPER to switch to a 16 amp system as that stator is like $440!!!!!!!!! You can buy a flywheel, stator, and rectifier for way less than that. The 16 amp will work just fine, and easier on the crank, as that what is on the 260's. You have the 40 amps as they intended them to be used for bass boat applications. I have a good stator and 2 regulators if you want to stay with the 40amp.

 

[Bubbakat]

James is that Boyson reeds or just replacement fiber ones. I know they work better then the metal ones. I may put a set in my 100 merc.

 

[wrechin2]

No, I don't like Boyeseen. Had a few issues with them. They are dual stage where these are single stage. What year 100?? I can check to see if they offer them.

 

[minner]

That is some fine work there wrenchin.......

 

[REELWORLD42]

I have a 1999 225HO Johnson that seems to be getting to much gas or not enough air, how did you modified the air box to allow more air in ?

 

[wrechin2]

The 99 air box is more than capable to feed it with air. The problem was Skeeters was a 94 air box and was VERY restrictive and was not designed for those "BIG BORE" carbs.

Did the issue just start?? It may be a stuck float causing it to flood. I have seen MANY, MANY times that people have messed with the enricher valve and they will have it in the wrong position and it will flood the engine. It is the thing in the front, behind the air box with the red handle. The whole time it is running it will pump in extra fuel. Feel free to give me a call and I will be happy to walk you through checking it.

423-304-0930

 

[REELWORLD42]

it started this a bout 6 months ago by looking at the sparkplugs the top two cylinders on the starboard side are always wet and all the rest look good

 

[wrechin2]

At a idle the plugs will have a wet look. Those carbs have a adjustment screw and may have vibrated loose or being side by side, you may have 2 cylinders damaged. Sometimes 1 will fail and the heat will transfer to another cylinder and damage it. I would look at doing a compression and leak down test to start to check health of the engine. It may need some attention. Or may need the carbs looked at. You may also index the flywheel and make sure spark is correct. Quit a few possibilities. Has it lost any power??

 

[REELWORLD42]

It has not lost any power smokes real bad on start up not missfiring still runs good

 

[wrechin2]

Start up smoke is normal as you inject a lot of fuel in it to start it. If you only have the issue that the plugs are wet, then I would check the settings on the carbs. May be weak voltage and not able to burn off most the fuel. We tested Skeeter's ignition due to the bog and found the spark is weak on a few cylinders. When he re-coops from the rebuild, he is going to replace some of the ignition parts.

 

[REELWORLD42]

ok thanks for your help just one more thing this motor is on a stratos 21ss extreme and at wot it will do 74 mph gps 5900 rpm i'm running a 26 pitch power tech prop 5" below the pad, what can i do to get more speed out of it with out spending a lot of money

 

[wrechin2]

VERY CHEAP is to Optimize what set up you currently have........ I take it that you have a jack plate on it right? If so, raise your engine up 1/4" at a time paying attention to you RPM's and GPS speed. WRITE THEM DOWN. Continue to raise it up until the speed and RPM's peak. When you raise it again and the rpm's go UP and the speed goes DOWN lower it back down 1/4". BE SURE TO WATCH YOUR WATER PRESSURE!!!! Not a big fan of the power tech props. They are a decent prop but, a worked raker or trophy would probably do you better. JMO.....

 

[REELWORLD42]

yes i have a manual jack plate i will try that, what pitch raker or trophy would you recomend i have a 24 pitch trophy but it 's about 6 mph slower on top end tryed a 24 inch raker and it was to slugish on hole shot and tryed a 26 raker it would only turn 5200 rpm and about 10 mph slower on top end

 

[wrechin2]

Rakers are not as strong out of the hole as a 4 blade but generally a 3 blade will yield faster top end speeds. 4 blade prop generally have better hole shots, bite better in rough water, ect. You didn't mention what the raker ran on top end. You can enlarge the exhaust holes to help the hole shot and have some cup added to the blades for more bow lift and will allow even larger exhaust holes to help the bottom even more. This may just be one of those rare cases that the PT prop is the better prop on that particular hull. The 225HO will peak in power at around 6300. Your power pack is rev limited at 6700 RPM's. They are a lot of people turning smaller props more rpm's which will result in stronger hole shot, acceleration, and most of the time same if not more top end and is easier on the engine. It makes it less likely to detonate if you have bad fuel or a slight overheat having a "light load". The only thing is that the oil ratio needs to be raised to 40:1 for over 6K. There are plenty of 3.0L OMC's turning over 6K with no problems. JMO.....

 

[REELWORLD42]

THANKS for the information there is a lot more to getting a boat set up than i thought i think it would be best if i could find some one like you to help me get it set up because i would more than likely do more harm than good and waste a lot of time and money .

 

[wrechin2]

It is very simple. Just take you a pad and pencil. Make a test run and write down the speed and RPM's. Raise the jack plate 1/4". Make another run. Write that speed and rpm down. continue to raise it up and until the speed drops, then lower it back down 1/4" and you are very close. This will resut in more top end and better fuel economy. Just keep a eye on the water pressure.

 

[Skeeter]

5" below the pad sounds awfully low. Most set ups I have seen on Stratos/Javelin boats is around 3 1/2 below. these hulls seeem to favor that round about engine height. But not all hulls like it. Mine is currently about 4-5" below but I have ran it as high a 1" below. on mine between 3-3 1/2 is the sweet spot. Its a very simple fun way to set up your boat.