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    Sports C Dillion Racing modified plans

    Purchased some plans from Dillion Racing USA and decided to go racing. Many hours of R&D later, I further changed designs in the plans to suit my needs.
    I am running the Sports C motor, which is a...
  2. Thread: Port Timing

    by ice_spy
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    I know this is out of date, but I was hoping for...

    I know this is out of date, but I was hoping for some results in porting the 2 cyclinder 40hp nissan/ tohastu ?
    I too wish to play with a spare block i have.
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    I got the boat out today with the M40C swap. I...

    I got the boat out today with the M40C swap. I have no base measures to start with as I didn't test with standard box 1st. However I have a standard untouched box coming soon, that I will be able to...
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    View Post

    <a href="https://freeimage.host/"><img src="https://iili.io/KKK2XS.jpg" alt="KKK2XS.jpg" border="0"></a>
    Good enough for now, until it needs another coat, ill fine sand it smoother.
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    Surface driving a fishing box

    Chasing speed with a standard gearbox, designed for submerged use from factory.
    My question is, what other modifications can be done to make the gearbox faster, with a surface driven propeller ?
    ...
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    Again, thread may be a bit old but I'd like to...

    Again, thread may be a bit old but I'd like to give my stance on the 100 view car crash.
    From my understanding on propellers, it is like a screw. The pitch varies the amount of travel, the gear...
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    I've ordered a new set of race reeds from CCM, ...

    I've ordered a new set of race reeds from CCM, looking forward to them arriving and hopefully will solve the new problem of very noticeable power loss. If not it has to be lack of power from 100 psi...
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    Sticky: Good read, and great work. I use to play with...

    Good read, and great work. I use to play with jetskis and the power pipe was always one of the best power improvements you could do to the 2 stroke. I have been thinking if it's possible to squeeze...
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    Well I tested the boat again with the reed...

    Well I tested the boat again with the reed stoppers bent back to original postion. Slight improvement of power down low. I'm thinking these reeds are useless as some are only just sealing on the...
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    Thanks mate, I'll give him a call and order a set...

    Thanks mate, I'll give him a call and order a set of new reeds. Much appreciated.

    Zul8tr, wow thanks for the direct link, what a great read. Very interesting thread on oils. Reminds me of the...
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    Gaskets in lower leg top of exhaust tuner...

    Gaskets in lower leg top of exhaust tuner replaced and on the tap, a little bit of water. Too for a test run and plugs came back dry no water. Flushed on the tap with fresh water and bottom plug was...
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    Update.. bottom seals replaced, the motor has had...

    Update.. bottom seals replaced, the motor has had all new original gaskets replaced also. Tested on the tap, the bottom cyc was still getting heaps of water. The point of entry was not the bottom...
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    I'll have a read on that thanks Zul8tr, no I...

    I'll have a read on that thanks Zul8tr, no I haven't seen that thread. Plea see e post a link if u can.
    So it was mentioned that I should check and or replace the bottom crank seal. When I...
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    Checked the reeds, they are ok, not broken and...

    Checked the reeds, they are ok, not broken and sealing pretty good.
    Called a boat mechanic and booked it in. I have to bite the bullet and leave it to the experts. Some things although seem...
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    Looking at the pics again, notice how bad the...

    Looking at the pics again, notice how bad the misalignment of the gasket is on the bottom piston. This could be causing the failure too as it seems to be most misaligned on cyclinder #3. Lower edge....
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    Sorry missed the replys on last page. Zul8tr ,...

    Sorry missed the replys on last page. Zul8tr , TCW3 oil Castrol brand and premium 95 octain. 50:1 with a slight drop more for a little more lube.
    Dragracer checking my photos again to look for the...
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    Thanks Dragracer, yes I remove the powerhead to...

    Thanks Dragracer, yes I remove the powerhead to reach the bottom two bolts. Perhaps your right and I need to torque them up to at least 20-23 lb. I think 25 to 30 could be too much.I lightly sanded...
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    Thanks Stephen. It so hard to give advice when...

    Thanks Stephen. It so hard to give advice when you can't see it or know much about what's going on. Appreciate the help.
    The base gasket is brand new. The adapter plate every time I pulled it off...
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    Well got them all out bar one. Took to the...

    Well got them all out bar one. Took to the machinist to remove the last bolt as it snapped off flush. Heat and vise grips worked a treat.

    Assembled the motor today.
    Bad news. Water still...
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    http://i159.photobucket.com/albums/t156/ice_spy/CM...

    http://i159.photobucket.com/albums/t156/ice_spy/CM150830-09033306.jpg
    Port misalignment pic
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    Cool, thanks for the good advice from all. Slow...

    Cool, thanks for the good advice from all. Slow and steady should win the race. I buggered a head bolt, drilled and tapped a new thread that was off center and basically butchered it. Beyond a...
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    Bore and pistons look ok, no scores or grooves...

    Bore and pistons look ok, no scores or grooves that I can see, only pollished but no cross hatch left. I will post some pics up tomorrow morning. :)
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    Is approx 105 psi on all 3 cyclinders too low...

    Is approx 105 psi on all 3 cyclinders too low compression? Could the water in the cyclinders have caused damage that lowered the compression?
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    So after some Google reads, is the best method to...

    So after some Google reads, is the best method to remove broken studs that are not flush with the surface to weld a nut on the end of the broken stud and shock them off slowly with some spray, any...
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    Ok so I only snapped 7 out of 14 bolts... that's...

    Ok so I only snapped 7 out of 14 bolts... that's a good start. Lol. Applied heat and inox spray but they were definitely not coming out easy. Didn't want to apply too much heat to the plate. At...
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    Ok so as I have another spare head gasket I...

    Ok so as I have another spare head gasket I pulled it to be sure of good seal. These are the pics. It seems there was very good seal and gasket glued / stuck to both surfaces. Comp test showed...
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    I really appreciate your advice to help me. So...

    I really appreciate your advice to help me. So far no one else can/ has. Even marine workshops.
    Could I do a compression test to attain if the head gasket has failed again or if not the water then...
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    No water in fuel, so it's possible if the side...

    No water in fuel, so it's possible if the side cover exhaust plate gasket has failed this could allow water in the cyclinders ? Also if the base gasket failed this could also allow water in the...
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    Tohatsu / mercury 3 cyl water on plugs.

    I have a tohatsu md50, 2003 3 cyclinder. Motor was running fine for approx 3 hrs then blew a head gasket. Possible cause was a blocked thermostat with a bit of plastic lodged in there.
    Gutted...
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    I ran one of these boats around my waterway for a...

    I ran one of these boats around my waterway for a few years. It came with a 20hp. Upgraded carb to 25hp but wasn't much better. Added power trim and the boat was much mlre fun and controlable. Still...
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    tohatsu 50hp tacho installation

    Help needed.
    Having some trouble finding the tacho signal wire to run a marine tacho Set to 6 pole.
    Can anyone tell me what colour wire and it's location please?
    My motor is a 2003 tohatsu 50hp...
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    That's a mean looking tohatsu ! Powerboat,...

    That's a mean looking tohatsu !
    Powerboat, sorry I meant 91 lower octane might be better suited.
    I think it looks more like water but. What's the silicon(?) around the head ? Was it used with...
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    I'm no expert but here's my suggestions. 30 psi...

    I'm no expert but here's my suggestions.
    30 psi extra compression, +98oct might be causing pre ignition. Have you changed the timing? Maybe 91 ron would be better, can you hear pinging up top, ...
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    I would try Ebay, you guys seem to have all the...

    I would try Ebay, you guys seem to have all the parts available in the US.
    On the note of exhausts and tuning, why do 2 stroke outboards have a simple flared tube exhaust and housing and not develop...
  35. Sticky: EVINRUDE OUTBOARD WANKEL's Based Engine:...

    EVINRUDE OUTBOARD WANKEL's Based Engine: https://youtu.be/9bgsrJNMouE
  36. Sticky: Wow ! What a read. I was glued to my seat reading...

    Wow ! What a read. I was glued to my seat reading this.
    Its sad one of the only alternative engines to piston and crank have had such a hard time from others, rather than a joint interest to...
  37. Started out with polyester on my jetski days....

    Started out with polyester on my jetski days. Cheap and nasty that stuff. Rebuilt a 10ft mercub tunnel with vynalester and it stuck good. But after using epoxy, although expensive, I will not use...
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    It's awesome Glenno, the twin carbs certainly...

    It's awesome Glenno, the twin carbs certainly has the wow factor. Thats what I was thinking about too, twin exhaust pipes out the back. It would scream. Lol. Fun factor build 10 out of 10.
    You...
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    Dual carbs will always suck more juice. However...

    Dual carbs will always suck more juice. However your results seem to show an improvement with more fuel entering the motor. Air speed has a lot to play with intake lenghts, you may want to try some...
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    On a tunnel, a surface drive prop should be level...

    On a tunnel, a surface drive prop should be level with the bottom of the tunnel plank. Remember the more set back the more you have to raise the engine as the water rises the further back your motor...
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    heat and then cold gas in the right spots can...

    heat and then cold gas in the right spots can unfreeze most rusty bolts etc.
    If you do find a replacement m50d trim tilt assembly in the usa, please let me know if there is another spare one for me...
  42. http://i159.photobucket.com/albums/t156/ice_spy/20...

    http://i159.photobucket.com/albums/t156/ice_spy/20140309_094050.jpg

    On this type of set up, do you remove the impellor and water is fed direct into motor? or does it just feed the pump housing?
  43. I was at the races the other day and on a tunnel...

    I was at the races the other day and on a tunnel hull set up, had two water pick up tubes running off the transom to hoses that fed into the motor for cooling?
  44. Cant find hub for chopper II mercury 25 seapro

    I have a 2008 mercury 25hp seapro. or known as the international. It is the same as the tohatsu engines. I dont think these are sold in the USA due to emissions laws.
    I have a mercury racing chopper...
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