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Nice collection
Are they all matching Serial # on block and rear clamp tag?
The 2 versions of the 25ss are they the early (1973 --> ) CD ignition and the later (1976 -->) CD ignition with the 2 lb...

Dean

If the ff 211.MOV and the other one are in red on your screen then a left click should open. Look to the lower left on your screen for the MOV to verify then left click on that lower left...

Here in the US the prop shafts are reduced to 9/16" and shear pin moved closer to prop nut so more available props can be used like 3 blade over the low performing Japan 2 blade. Check rules in Aus...

Whippet II is a good choice for the 321

https://nybergdj.wixsite.com/nycraft

If you build do not use fir ply to heavy and will grain check a lot unless fiber glassed then way to heavy, use...

Would you please post issues 1977, 1978 and 1979 here like others in that decade in link below?

http://www.boatracingfacts.com/forums/forumdisplay.php?217-APBA-PROPELLER-MAGAZINES

Thank you

For a 1997 15 hp I thought is was a 15 ci in displacement, I thought the old ones were the 1950's era 15 cu in engines. Your 1997 engine is 2.38" bore x 1.8" stroke and the total displacement is 16...

The Merc 15 cu in engines (KG4H) that were used to get 50+ had special streamlined quicksilver gear cases with 1:1 ratio and only forward gears and short exhaust mid sections, your service engine...

If your rig is light and can get aired out to reduce the water drag as much as practical the smaller dia higher pitch prop will give the best top end. If you go for fully ventilated with part of the...

Mike

Great info.

Total Tapped CR? Do you mean Total Trapped CR? Which I know as cylinder volume above the top of the exhaust port to TDC and is much lower than based on total cylinder volume...

Jeff

Like I said not familiar with forged pistons or if the 0.005 clearance is what is required for your engine, with forged I have been told warm up is critical so they do not stick.

Does...

Jeff

What piston skirt to wall clearance and ring end gaps did you use for the Wiseco's? Are these cast or forged? High silicon?
Not experienced with Wiseco's, don't have a dino and do not hog...

Where are the pics?

Here are logos scroll down in post to John Schubert TART

http://www.boatracingfacts.com/forums/showthread.php?18887-Marchetti-Logo&highlight=Marchetti+logo

Great pics. That rocky shoreline looks rough to launch from.

Also share them here

What great pics and story of you time

Welcome, Those are very cool racers. Tell us your stories and yes to the more pics.

Your machinist knows nothing about blind bores I believe he used yours as a Beta test. What a jerk. Is he local or did you have to mail your block? If local why not bring it back and have him fix it...

Jeff
Yikes! will there be enough clearance when hot at 6000 rpm with some rod stretch?

The 5 to 10 offset why? He obviously didn't center the boring bar to the cylinder what a jerk.

"I...

Contact John here

https://hydroracer.net/forums/forum/main/general-hydroplane-runabout-discussion/472692-raceboat-other-racing-decals

George

Never knew that, how tragic to loose your Dad at such a young age and at a race meet that you were both competing.
Hope to see you at up coming AOMCI meets.
Peace to you

Pete

Next time get a different machinist. Started at +40 with the bar, not good.
When I had + 15 over bore work done on my 25ss with my great machinist in Orlando, who is expert with 40 years doing blind...

Run lots of oil like 25:1 and make sure the cooling system is in great shape and passages and all areas are free of scale.
Not good your machinist went 40 without your permission. Does he have lots...

Jeff
Just because Wiseco has 40 over does not mean that Mercury was willing to go there with there available oversize pistons. As I asked what was the max oversize that Mercury offered back then? ...

What is the largest oversize "Mercury" piston that was available back in 1975 for a over bore job? IMO that would define the max bore diameter with proper skirt clearance included.

How is this Swift coming along?

"------sounds like--------"? IMO mighty trusting. Has he done a lot of blind bores?

Jeff

What are the accurate measurements for bore out of round and taper of your block?

Depending on your budget and willing to ship the block there is a machine shop here in Orlando that does...

looking for 6202C3 15mm bore x 35 mm OD x 11 mm thick ball bearings for my Yamato Y80 gear case. They are readily available but not sure of quality since made all over the world. Any leads on...

Yep, here are the Foo Ling details

Sheet 1
http://www.boatsport.org/PDF/fooling1watermark.pdf

Sheet 2
http://www.boatsport.org/PDF/fooling2watermark.pdf

I assume by after market you mean fiber reeds? For your service engine the SS will do very well. Just make sure no pits or other bad spots on them. I am not familiar with the reed set up in your...

Thanks all, before heat I tried acetone on a cotton swab and several dabs to keep brass head area wet and it softened enough to loosen the tube.

Working on a NOS Tillotson KC16A (same design as KC15A and other KC's and KA's). The idle tube on these carbs are secured into the body from the factory with a hard reddish sealant on the threads....

Charlton pics:

Page 16 lower left Skip Ritter in a BSH Charlton 525F

http://www.boatsport.org/magpdf/bsv42.pdf

Page 14 lower left Dutch Stossel DSH Charlton, also page 15 bottom 5 A stock...

Yep sad. In addition to for aft restraint need orbital launch restraint.

Some put bumpers at the front on these lake runner set ups. With race type trailers that are different than what is in this tread the stacking of boats is different to allow tie backs to the trailer....

Jim
Sent you a PM in response to your PM.
Note on the steering with tie back cable set up and 3.5" drum the effort to turn will be reduced but will take more wheel arc to go through a defined turn...

Look on page 35 for the new for 1958 Swift Big D

http://www.boatsport.org/magpdf/bsv64.pdf


Your # UHD11206358114

Note in the add the serial number UHD112 was a designation for the Swift...

That is a nice restored Swift Big D and looks in great shape for the year. I do not know how to interpret the Swift serial #'s. My guess is a later Swift like 57 or 58 with the long front cowling ...

Since Modifiedoutboard asked "
Ever wonder what a real port map looks like? Need one to run Dynomation Simulation"
Sounds like he needs a port time or port area map for the program? Doesn't the...

Dynomation Simulation program is for 4 strokes is that what you are working with ?

If you want info on 2 strokes port time area map in link below press "Theory" button and go to section 4. for...

Don't know about Yamis Pyramid style reed cages but the old doughnut Merc reed cages (55H, 44xs, etc) are prepped with pretty course paper in a 90 degree cross pattern (used by Jerry Wienandt racer &...

Would be nice to finish the 70's decade!

No starts May 15. This link works now

https://www.mecum.com/auctions/indianapolis-2018/collections/jim-street-estate-collection/

Service KG7 will be a slug for you on a 14" transom probably in the 30mph range, IMO not much thrill but a thrill for some I would spend money on a better engine for thrill? If you want closer to...

Lots of answers here and many preferences, most use the expensive West System epoxy that has several resin and hardener types available . I have used several including West. I like the simple 1:1 mix...

Did that earlier and NADA just did it again and WALA will review it, TKS

My Google search, not available for a read just purchase

Finally got the computer to cooperate with uploading pics that failed yesterday, Ron Hill helped, thanks. Here are the Dutchman patch pics I did on my 4mm ocume hydro deck.

Pics came out of order...

With a short boat 8'-8" it is limited on the engine that will work. You mention KG7H (1952 - 1953) and 20H (1954 -1956), 20H more expensive of the two. The KG7H being older would be the better choice...

Here is a Dutchman patch I did on the 4mm Okume deck of my hydro.

#1 is cut out the bad area, shape of cut to suit
#2 provide support for the Dutchman patch, I preferred just strips epoxy glued....