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There is another aftermarket powerpack manufacturer called Arieltek selling on Amazon & ebay. I know they have a programmable rev limit on the SeaDoo brain, so maybe they would build you a higher...

If you can find ANY 3-cylinder OMC powerpack with either a higher rev limit or no rev limit, you should be able to re-wire it to run your 35hp "Mirage" engine... It's basically 1/2 of an OMC V6 on...

The company has several other outboard gears for several brands, so they must have the "gear thing" figured out. Only these SST60 gears mention evaluation, so they must just be the latest offering. ...

Well, neither was I but it was the first dressed powerhead picture I could find. Anyway, if you imagine the pull start being out of those pictures, I'm really thinking about all the stuff BRP hung...

That's a great trade! Especially if the restoration is good. Even if the bores are bad, they can be rechromed by U.S. Chrome in Fond du Lac, Wisconsin. It's a 3-cylinder looper powerhead similar...

You seem confident the current 45SST cowl will fit over the 2-cyl 40/50/60hp Etec engine so I'll take your word for it... Here's the powerhead with all it's parts.

2-cyl Etec is 40/50/60hp depending on computer & injectors... There is a LOT of complex oil injection lines, oil tank, fuel injection components, wiring, computer, etc attached to this powerhead...

Just discussed Cocktail Class on hydroracer as well: I'll copy my reply here;

3 second google search result: https://ccwbra.com/ ( There is actually a drawing of a mixed drink as their logo! )
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Jeff, if your guy didn't (couldn't..?) run his boring bar to the bottom of your #2 cylinder, then he OWES you more work. Take it back to him, since the other two bores were right, then he can do it....

Look at air cooled/water cooled snowmobile engines...? Loop scavenged (looper) with WAY more power per cc. The snowmobile engines usually have waterpumps.

Also, the personal watercraft engines...

Page 3 of this thread, 2nd post, 4th picture shows a small chase boat. I believe it is also a Molinari hull based on this boat for sale in Augusta, Georgia (Pictured)...

No, that wasn't this boat... This one was in Florida for many years and came to Georgia about 4 years ago. Until last week, it had not seen water or the light of day since it came from Florida.

I will try to edit this post to include measurements, but wondering if anyone can positively I.D. this racing runabout?
We have determined it does not match the lines of a Hal Kelly design, "Jinx"...

Just a thought here, but on the back of the OMC key switch there are two terminals marked "M"... One is a vertical "stud" and the other five are horizontal tabs. All use the same tiny brass screw...

Ok, so problem found and you now just need a cheap, used flywheel... You'll want to accurately verify TDC now on #1 with a dial indicator and set the timing pointer to exactly zero degrees with the...

You'll likely get WAY better interaction with your fishing motor over on a site such as www.bassboatcentral.com or on iboats.net mechanics forum...

In any case, are you sure you are picking up...

Huh? Evinrude's entire lineup from 15hp to 150hp is the two stroke E-tec engine...
Tohatsu's TLDI is available in 40/50/90 hp and these are all still very close in weight to their old carbureted...

There is always a way... I'm guessing the easiest would be a Yamato 102 or 302 gearcase mounted to an adapter plate that in turn bolts up to the stock/fishing tower housing of the Merc500 but I...

Guys, this is a BIG DEAL!! I know several others have taken small bites of this project in the past, but van Weele's are really going to save alot of old Mercury engines with this investment! Lots...

Bill, I guess it's possible the drivers suit I have is from Marshall's later years where he may have bought an OMC Stinger 100ci engine... Or Marshall added the only OMC patches he could find at the...

Marshall Goldberg competed in "SJ" class with his boat named, "Daffy Duck"... Are you mixing up the 3-cylinder 49ci Stinger up with the V4 Johnson Stingers with the Scorpion shown in the driver's...

Looks like Bill Richter found the guy! Thanks Bill. It appears Marshall Goldberg raced alot in the Northeast and I've found some race results in archives of the Lowell Sun newspaper in 1974 and...

Blue Water Restoration is in Milford, Iowa, not Emmetsburg... Steve Dyhrkopp is there? Phone: (712)338-2557 and could likely shed some light on the hydro (Marchetti?) in the beginning of this thread....

These are cheap and readily available on ebay... They are crazy expensive if you're buying one up to par for the current F1 tunnel racing boats, but cheap if you'll accept a vintage boat steering...

I hope you got some help from the CDI Electronics Troubleshooting Guide link I posted...

Your fix was literally "Step 2. Inspect and clean all engine and ignition ground connections."

It's almost a fiberglass version of the Glen-L "Tiny Titan" plan...

https://www.boatdesigns.com/8-Tiny-Titan-3-point-hydroplane/products/366/

Buddy just bought this to get the fishing engine off it... He paid too much, but he's going to sell the boat & trailer now.

The steering is included but I will throw away the thin wall, aluminum...

AND, if it was a factory jet, it's got a 15" exhaust tower, too. That would be cool.

Please compare the engine model & serial no. from the quarter size aluminum disc pressed into the block to the I.D. tag mounted on the swivel bracket to see if the entire powerhead has been changed. ...

I'm not seeing it... Here is the parts list. Pictured are Key #27 Idle Jet and Key #40 High Speed Jet

If your jet is located between mating surface between carb & bowl, maybe look at a 1973 65hp...

Ouch! Pretty sure NOTHING goes in that hole, gaf1racer. That's just a circuit passageway for gas to get from main body to the bowl.

Your engine should have (3) main orifices #61D and (3) air...

Here is a picture of a typical set of 3-cylinder OMC carbs... the top hole is an air idle mixture orifice (air jet) and keep in mind, the bigger the hole, the more AIR is let in for idle... The...

Instructions to troubleshoot "No Spark on any cylinder" were linked in my previous post... Reconnect your controls, then it says to disconnect the white wire from ignition box (this is the stop...

Well, first off, how about telling us the year, model, whether it's 2-stroke or 4-stroke, and could you verify the wires are "just yellow", and not a yellow/black combination?

You should be able...

Does the water flow up through the propshaft bearing carrier? That is very similar to the Mercury 1500XS and 850XS gearcase water pickup design. If you have power trim, be careful that you don't...

Members here who currently race a combination like yours are mostly in a regional Canadian racing club... Try over on their section and find their website & facebook page for much faster replies:
...

It takes a Speedmaster looking gearcase... It's a 650X tower & clamp assembly based on this old post: http://www.boatracingfacts.com/forums/showthread.php?17586-Mercury-650XS

I believe you want the front ends to line up with the swivel pin... Not with the tilt tube. The idea is the steering bar ends each swing an arc about the center (which is the swivel pin) so that...

Ok, with that engine, here is a starting point; http://www.boatracingfacts.com/forums/showthread.php?17499-Critchfield-Setup&highlight=Allison+critchfield+Canada

Your boat bottom is probably not...

Welcome to the messageboard! I'll be the first to chime in and answer a question with a question... Does the 75hp engine have the stock, fishing engine size gearcase & gear ratio or does it have...

An easy, and inexpensive investment would be to purchase the JKT or EKT parts listl for the OMC 15A engine off ebay... I see they are less than $10, including shipping. You may also contact SeaWay...

Why not just grossly overpower the PWC with a readily available Mercury V6 outboard engine stuffed under the seat?? You keep the stock jetpump so you only have to invent half the project.
...

The first picture must be in California... There's not one, but TWO Volkswagen buses on the beach!

Here is a 52ci Mercury engine with custom, high compression pistons...

https://tallahassee.craigslist.org/bpo/d/60-hp-race-prepped-mercury/6382567875.html

Prop Riders, could you post a few pictures of your boat, and also could you post the I.D. stamp off the keel inside the boat for us?
Any pictures or video and could you tell us how the boat handled...

Wondering how many Desilva Delta runabouts are still out there. I know of three... (now four!)

C-5 is in Gainesville, GA and is shown in the pictures below.

This one is in Indiana and was the...

Check something for us: Can you twist handle to "Forward" gear position, then turn the flywheel with your hand (turn it "clockwise", as viewed from above the engine). Observe now if the propeller...

Short answer: No. Flush all you want. Only if water flows "uphill" in your area would you have a concern with flushing an outboard engine with the engine either running or not.

Exception: IF...

Regarding EITHER engine, make certain first that you install an accurate, functioning tachometer so you can properly evaluate ANY/ALL propellers you install and test. No one here can advise the...

Why not just contact Yamaha with the serial number and ask them...?????