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  1. M

    Engines and Pipes

    Any interest before I put on eBay? Prices do not include shipping. PayPal add 3% Engines all good compression and have been run at least once this season so have not been sitting for years $150 - .21 OPS Supermarine (Geraghty modded) $125 - .81 OS VRM (modded but cant remember who) - newer...
  2. M

    WTB Mac 67 Head Button

    Like topic says, looking for a mac 67 head button. Please let me know if you have one I can buy from you. Thanks Brian
  3. M

    good pipe for mac 84?

    cant seem to find a AB 67 or 84 parabolic anywhere. wish i could but until then, whats a good alternative for the mac 84? will a basic macs 13cc pipe (1385) work well? i also have an extra 67 parabolic. any chance that will have any success on the 84 or am i just dreaming? thx, Brian
  4. M

    WTB: Brown 84 Parabolic

    I know I just missed one.... Anyone else have one for sale?
  5. M

    some pics from today

    Meant to take some shots of the tboat, but lost the shaft 2 seconds after i threw it in so only pic is the one with the tennis ball :) But ended up running the seaducer, and got some nice shots (courtesy of my father). Love seeing how the water comes off the hull. That ripple is so cool...
  6. M

    seaducer 67 prop?

    I run a mac 67 w/ AB parabolic in a seaducer 60/80 I went from a x457 --> x460 ---> x462 each upsize gaining about 2-3 mph with no plug issues or associated problems. Is it worth me going to a x465 or am I asking too much :) Any other props out there (outside of octura) that might bump me...
  7. M

    head clearance effect?

    Checked my head clearance the other day on a mac 67 and was .020 (used plastigage and micrometer) CMDI recommends .010-.012 Right now my plugs look good (slightly pulled out and good color) and running fine. What would I potentially gain by moving to recommended head clearance? I dont have...
  8. M

    WTB mac 67 head shim(s)

    need a shim or 2 for a mac 67. PM me or post if you have something that will work. Thanks, Brian
  9. M

    water in engine... any tips?

    so what is the best practice when your engine takes on water. had a rigger flip was running without cowl and took on a bit of water. i spun the motor with the starter and pumped the water out. but now what?
  10. M

    switched to 60%

    today i tried 60% nitro for first time in a cmb 67 purple head on a seaducer. when using 40% i have the settings pretty much nailed down. switching to 60%, intitally started with same setting (1.5 turns out) and the thing is spitting major fuel out the pipe. not only at idle but also as the...
  11. M

    rooster tail spray pattern

    running a seaducer 67. the spray pattern on my rooster tail seems very high when comparing to some of the other boats i see running around. makes me think im losing so speed because of it. I dont have a good pic of it, but looks very similar to this i have tried x460, 560, 457 and all...
  12. M

    cmb 67 purple questions

    I picked up this engine a couple years ago used. Decided to put it in a seadcuer 67 this season just to see what it did. Keeps ruining plugs after 2 or 3 laps. I dont think its too lean - 3 turns out. Anyway, Im trying to take apart to check bearings and this thing is giving me a hard time...
  13. M

    haze on paint after polishing?

    Using Klass Kote epoxy paint to finish a boat. Not my first time using it, but got some significant orange peel this time around. I think I did not have enough reducer when spraying (also was a little cold ~50 degrees in the garage). In any case, in trying to get rid of the peel, I wetsanded...
  14. M

    ca glue injury :)

    the other day, there i am building the frame of a zippkit. anyhow, some ca glue dripped down the frame and didnt notice and stuck my index finger right in it. so finger is stuck... luckily i have the acetone handy. so after 5 minutes of trying to open the bottle with one hand, finally get it...
  15. M

    shovel nose plans

    Looking for some plans for a shovel nose. Dont care what size. Just want to put my scroll saw to use :) The link for "BAW Sport 20 Shovel Nose Hydroplane" is not working. Anyone built this? Also, mpb site has a few plans --- http://www.modelpowerboat.com/forum/downloads/cat-3.htm Has...
  16. M

    o.s. 20g carb needle?

    Hi all - Im looking for the needle assembly for a OS 20g carb. Hoping someone installed a remote needle and got rid of the standard needle and has it laying around somewhere :) If not, I can get one off tower. Thought Id check here first. Thanks Brian
  17. M

    pipe length question for 21

    I have a ops 21 super marine with a cmb muffled pipe. this is my first attempt at a front exhaust and im wondering if i am measuring something wrong. if I measure from mid cylinder around the header and to the weld, the shortest I can get is 8 3/4. but if i measure straight from plug to...
  18. M

    a couple tuned pipe questions

    I apologize ahead of time if these are newb questions, but just trying to figure this stuff out. 1) Can you tune a pipe on the bench? Or does it have to be in the water under load to accurately tune it and find the correct length? 2) If I change my high speed needle setting or nitro %, will I...
  19. M

    flex coupler size for cmb 67 (purple)

    Im running to the hobby shop on my way home from work tonight and need a new flex coupler. I meant to bring the engine to verify fit but forgot it this morning. Anyone know the size for cmb 67? If it matters, its an older purple head. Thanks Brian
  20. M

    How would you rate this engine?

    http://cgi.ebay.com/ws/eBayISAPI.dll?ViewI...em=180299444553 When was this model made (i assume its not a current model)? They still make parts for it? General opinions?
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