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Running on the rich side is definitely good. But if the K&B has very tight fit at TDC, it should not be run too rich. The engine will not get up to proper running temperature if it is too rich and the piston/sleeve will remain tight. Although I have not experienced it myself, I heard it can...

it is a Prather vee

Please post some pictures and running clips. I had a K&B7.5 in it and it was a lot of engine for the boat. I am converting it to surface drive and I hope it will settle it somewhat. k

I used to fly gliders and I remember LSF has a nostalgia class. It will be fun if there is a similar event/class for RC boats

I do not think HP (Hirtenberger) ever used PDP (Perry direction porting) in any of their engine lineup. HB engines did use PDP. k

I am restoring a Dumas CF 40 that I built back in 82. Of all the vee hulls that I have seen, this Dumas 40 has the most pleasing lines. It looks very much like the Cigarette offshore boat of the era. The K&B 7.5 turning a JG I25 was too much power. It probably ran mid 40's in a straight line...

Nice. My first hydro was an original 20 size Dragonfly with a shovel nose. The kit was all birch ply unlike the pickle fork version. If you have not done so, I suggest you glass the non-trip where it meets the deck. I did not glass it on my first build and it soon crack after a couple of...

Thanks guys for your replies. As I mentioned I bought a Prather type collet meant for a Zenoah. But the thing is too bulky for a .40 engine. I have since bought an Octura collet on Ebay. The Prather type collet (Aeromarine collets look almost identical) can have serious runout. I have...

Thanks Tom for replying. I have found an Octura one on Ebay. It is a 6mm for a .150 cable. I figure .150 will do for a .40 engine of that era. k

All, I’m finishing up a vintage project. The plan is to use a period correct HP gold star .40 engine. The thread size is 6mm. I bought a 6mm Prather connector but it is very bulky as it is meant for a Zenoah. Is there any other 6mm cable connector out there? Does Octura offer one? Thanks, k

3.75x4.25x1.5 = 23.9 cubic inches = about 13 ounces K

Oh, I am not worrying about rust. I am thinking the water may not exit the muffler completely and the trapped water may run back into the engine when it stops Thanks, k

Hi Rick and Ronnie, I cannot really pack the muffler with Scotch Brite or Chore Boy because I am injecting water into it. But I may give it a try and route the water out the sponson. It is a good trade if it can muffle the bark. Thanks, k

Thank you all for your replies. I am actually looking for an add-on muffler. I do have a .45 Mac quiet pipe but I would need to enlarge the transom opening - something I try to avoid if possible. Although I've never tried them, I am sure the CMB, Nova and Irwin pipes are all quiet. I have a...

What is the most quiet .45 size muffler? I have only used the Prather muffler plus another unknown make that I can inject water into. I have found the Prather muffler to be very loud. I even tried an internal stinger but it does not muffle the bark too much. Combining a Prather muffler with an...

A couple of years ago I bought some Fox miracle plugs from my LHS. I needed a few plugs that weekend and that was the only plugs they have. I do not race. Run 25% Omega. The Fox plugs worked well for me. FWIW

Unfortunately Dumas has been slowly getting out of RC boat. Only a couple of tunnels remain in the lineup.

I avoid using caustic or solvent as they will blacken the aluminum parts if you are not careful. Tiny pitting on the aluminum surface make it appear black. I spray some WD-40 or MMO into the engine and then wrap it in aluminum foil. I then put the parts on my car engine block when i come home...

I was on a business trip and did not see your message until now. I am very sorry for your loss. I will keep you and your family in my prayers. Kez

I am very particular with the finish on my car and my RC boats. Have my car serviced today and the dealership left a few scratches on the hood. I don’t want to use a buffer as it may remove too much clear coat. Is there a scratch remover that I can apply by hand? Thanks, k