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I'm told its a Macs pipe. Not sure what model. but its not a quiet one. I know that because my ears are still ringing. I just came in from testing it out in the shop. Thanks for the nfo once again.

Looks like I'll be putting this engine in my sprintcat 40/60 for a while. Let me ask this beofre i cut it. Is the tuned pipe length still supposed to be around 11 to 10 3/4 from the center of the engine to the fat part of the pipe? I understand thats the length for an ops .67 but is it the same...

I'll try and order the Macs pipe mentioned. Thanks for the help once again.

Thanks, I'm not sure of the pipe it came with the boat and I wasn’t told what one it was. I'll upload a picture maybe someone can identify it if it s the stock OPS pipe?

Is the Octura x460 the best prop for speed I can use on this setup? Or is there something better? It is sharpened and balanced of course. Oh and the pipe right now is about 11" from the center of the crankcase to the fat part of the pipe or where the seam is. Should I go shorter like 10 3/4"?

Dick, Thanks for that tip. I didnt know that.

:o really?

Does it do much good to polish intake paths & carbs? Since I have everything taken apart I thought hey I’ll try polishing that. It’s a mirror all the way through now. I am going to try a couple of other areas next. Oh and is there a larger bore carb that boast performance on a OPS .67?

Thanks for the info Ray and to everyone else for the input. Justin

Here is what it looked like in the boat before a few hours ago I took everything out of the hull to check thing over since I bought it used. I am running 30% nitro wildcat heli mix is about the closest my hobby shop carries I can use. Its 18% oil mix synthetic blend. When I got the boat the carb...

I bought a used aeromarine sprintcat the 40/60 last week. And it came with an OPS.67 that had only had five tanks of fuel through it. The motor looked good and is clean inside. Despite some scuffs on the head and lack of the water-cooled header shown on aeromarines website. It has a 3rd channel...

He is looking at deep V hulls. The aeromarine challenger 43 I think. Thanks for the info. I used to work in a machine shop myself so maybe I can help him with getting some of the stuff mentioned done. He knows some people also.

What modifications are need? Thanks,

My dad decided to buy an engine and might start a project boat. He won it on eBay. But we can’t find much info on the motor online. I think it’s the older one is maybe why. But if anyone is familiar with the engine can the help us out with specs and personal opinion on the engine. It a CMB .67...

Looking to buy a gas catamaran. Similar to aeromarine avenger types, expresscraft etc. either rtr or less radio. trying to keep it at or below the 1k mark too. email [email protected] Thank you, Justin

Thanks for all the tips & info. I was looking last night & all the places I seen the Macs I mentioned for sale are out of stock or on order etc. So boaterbill is right. I'll keep an eye out here for one. I think my tank holds is it 250ml? It takes all of my little fuel filler bottle to fill it...

I’m having a MAC attack I was looking to buy a used or near new catamaran made by aeromarine or some other more reputable company. But I already have a 32” cat that’s 36” over all length that’s brand new made by a company that people seem to dislike. It’s the Proboat Thundercat 31. I got it...

Josh, Yes your right that is a nice looking boat for a great price. But for my personal taste in how the boat looks I dont care for the sprint cat style boats. I like how the avenger pro's, AC blast & flash cat 40's style boats look. And that forabuck 60 cat looks prtty nice also. I have been...

Forabuck 60 cats? I am new to the larger boats. And looking for a nice cat that’s pretty much setup rtr. I have a proboat thundercat 31. And its nice for what it cost. But I am wanting something a little bigger & maybe a bit nicer hull that can support a bigger engine & speeds. I am thinking of...

WTB Aeromarine Avenger Pro 44 or similar I am looking for an aeromarine avenger pro 44 or very similar cat that someone is willing to sell RTR or ARR (less radio) for a good fair price. I also like the AC Blast cat 40 & Flash Cat 40 boats. If anyone has one they are thinking about selling email...