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    Look at air cooled/water cooled snowmobile...

    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...
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    Sticky: Molinari tunnel hull skiff

    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)...
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    No, that wasn't this boat... This one was in...

    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.
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    Can anyone I.D. this old racing runabout?

    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"...
  5. Just a thought here, but on the back of the OMC...

    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...
  6. Ok, so problem found and you now just need a...

    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...
  7. You'll likely get WAY better interaction with...

    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...
  8. Huh? Evinrude's entire lineup from 15hp to 150hp...

    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...
  9. Thread: D stock runabout

    by 25XS
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    There is always a way... I'm guessing the...

    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...
  10. Thread: Mercury Mark 40-H

    by 25XS
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    Sticky: Guys, this is a BIG DEAL!! I know several...

    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...
  11. Bill, I guess it's possible the drivers suit I...

    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...
  12. Marshall Goldberg competed in "SJ" class with his...

    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...
  13. Looks like Bill Richter found the guy! Thanks...

    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...
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    Blue Water Restoration is in Milford, Iowa, not...

    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....
  15. Thread: Steering helm

    by 25XS
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    These are cheap and readily available on ebay......

    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...
  16. Thread: Yamaha 90 no fire

    by 25XS
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    I hope you got some help from the CDI Electronics...

    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."
  17. It's almost a fiberglass version of the Glen-L...

    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/
  18. Who made this mini, all fiberglass hydroplane? It's cute, and it actually worked!

    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...
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    AND, if it was a factory jet, it's got a 15"...

    AND, if it was a factory jet, it's got a 15" exhaust tower, too. That would be cool.
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    Please compare the engine model & serial no. from...

    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. ...
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    I'm not seeing it... Here is the parts list. ...

    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...
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    Ouch! Pretty sure NOTHING goes in that hole,...

    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...
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    Here is a picture of a typical set of 3-cylinder...

    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...
  24. Thread: Yamaha 90 no fire

    by 25XS
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    Instructions to troubleshoot "No Spark on any...

    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...
  25. Thread: Yamaha 90 no fire

    by 25XS
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    Well, first off, how about telling us the year,...

    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...
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    Does the water flow up through the propshaft...

    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...
  27. Thread: Steering

    by 25XS
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    Members here who currently race a combination...

    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:
    ...
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    It takes a Speedmaster looking gearcase... It's...

    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
  29. I believe you want the front ends to line up with...

    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...
  30. Thread: prop selection

    by 25XS
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    Ok, with that engine, here is a starting point;...

    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...
  31. Thread: prop selection

    by 25XS
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    Welcome to the messageboard! I'll be the first...

    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...
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    An easy, and inexpensive investment would be to...

    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...
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    Why not just grossly overpower the PWC with a...

    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.
    ...
  34. Thread: Speed Classic

    by 25XS
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    The first picture must be in California......

    The first picture must be in California... There's not one, but TWO Volkswagen buses on the beach!
  35. 52ci Merc with custom high dome pistons

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

    https://tallahassee.craigslist.org/bpo/d/60-hp-race-prepped-mercury/6382567875.html
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    Prop Riders, could you post a few pictures of...

    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...
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    Desilva Delta from mid-1980's How many are left?

    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...
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    Check something for us: Can you twist handle to...

    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...
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    Short answer: No. Flush all you want. Only if...

    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...
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    Regarding EITHER engine, make certain first that...

    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...
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    Why not just contact Yamaha with the serial...

    Why not just contact Yamaha with the serial number and ask them...?????
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    Yet another statement in support of the Yamaha...

    Yet another statement in support of the Yamaha 50hp... The boat could handle 85hp in sanctioned racing. That Mercury 40hp engine style in it's finest stock racing form only made about 55hp... (The...
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    Here is a direct link to HeviKevi's adapter &...

    Here is a direct link to HeviKevi's adapter & tuner. You can go back to the beginning of this thread to read the whole story.
    ...
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    That makes no sense..? If it's a short transom...

    That makes no sense..? If it's a short transom boat, then you should use a short shaft (15") engine on it. A longer shaft doesn't make the engine sit higher out of the water.

    For the boat owner,...
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    I got Trident's pics posted into my own posting...

    I got Trident's pics posted into my own posting above this. The pictures of an SST-90 powerhead on a cart above belong to Trident.
    -Tom
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    I believe the 75hp is a later model 49ci Evinrude...

    I believe the 75hp is a later model 49ci Evinrude "Sprint" engine. Same as the earlier Evinrude Hustler with a Nitro gearcase. Nosecone may have been added or they used a SST60 gearcase on it.
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    SST140 Brochure picture & specs to compare to SST90

    Here is the SST140 brochure page to show what the "bottom half" of the SST90 should look like... I couldn't find a SST90 brochure.
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    Leonard, Those engines have several guys running...

    Leonard,
    Those engines have several guys running them over on the website, www.ScreamAndFly.com
    I have seen little discussion of them here.
    Tom
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    The only way my last four pictures would post was...

    The only way my last four pictures would post was after I used Microsoft "Paint" program to reduce the width & height to 25% of the original picture, which put my pictures just under 100 kilobytes......
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    So Gene, a photograph of an actual 1957 "A" alky...

    So Gene, a photograph of an actual 1957 "A" alky König rope sheave won't convince you? Your vision/dream is pretty strong for the KOEnig spelling on that rope sheave then. I wonder if the...
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