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  1. Replies
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    I have one exactly the same as these pictures,...

    I have one exactly the same as these pictures, deflector, crankcase stamped 322, no signs of extra holes under tie bar, single carb, there are pictures on here from 2009 see thread "Konig - know what...
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    5,398

    I've used a Velocitek speedpuck, great speedo,...

    I've used a Velocitek speedpuck, great speedo, big numbers & saves speed & track, but no revs, for about a year, Excellent!

    But I'm told there are some new kart loggers that do the same & record...
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    5,257

    Both cable attachment holes & the center of the...

    Both cable attachment holes & the center of the pivot should be in a straight line, for the best geometry.
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    19,806

    Without a suitable load very little throttle is...

    Without a suitable load very little throttle is required to reach maximum revs, little throttle = little fuel = insufficient lubricant!
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    10,132

    Too much water coming out of mid?

    Too much water coming out of mid?
  6. The problem with copying the megaphone lengh from...

    The problem with copying the megaphone lengh from another similar motor is that the powerheads are similar, not identical.

    The length of the pipe is dependant on the exhaust port duration, & the...
  7. Cooling the Megaphone & the exhaust gas,...

    Cooling the Megaphone & the exhaust gas, increases the gas density & changes the speed of sound causing the exhaust to appear longer than it is, lowering the powerband revs, just the same as an...
  8. Jennings is a very good first book to read on...

    Jennings is a very good first book to read on this subject, but there are several more that offer a slightly different viewpoint & are more up to date.

    Try, Two-stroke Performance Tuning by A...
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    12,734

    Sorry my mistake as it looked like you were...

    Sorry my mistake as it looked like you were calculating the exhaust tuner length for a 3 cylinder motor with an equal length 3 into 1 tuner.
    I wasn't aware you could apply Helmholtz to reeds, I...
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    12,734

    Where does the exhaust port duration come into...

    Where does the exhaust port duration come into this calculation?
  11. Thread: Dura Fix

    by Seagull 170
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    2,890

    I'd agree with Mr Lo, Tig is the only way to go....

    I'd agree with Mr Lo, Tig is the only way to go.
    This stuff is way harder than ally, & you have to get the whole job hot as your using a gas torch that when it cools the ally has a much greater...
  12. Thread: Dura Fix

    by Seagull 170
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    5
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    2,890

    Are you saying it broke after repairing with dura...

    Are you saying it broke after repairing with dura fix?
  13. Replies
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    4,475

    http://www.ebay.co.uk/itm/260690665272?ssPageName=...

    http://www.ebay.co.uk/itm/260690665272?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649

    Sorry it's the UK ebay
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    4,475

    Or if you plan on more than 10,000 revs buy a...

    Or if you plan on more than 10,000 revs buy a Hong Kong one from Ebay almost half the price inc postage, programable for all the different engine configs, a lot of guys use them over here, I must...
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    828,338

    Tim the axial-uni flow expression depends of...

    Tim the axial-uni flow expression depends of who's work you read last.

    Using someone elses cylinder block precluded the use of 360 degree ports & I wanted to get any heat away from the lower...
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    Thanks for that Jeff, but I was rather hoping one...

    Thanks for that Jeff, but I was rather hoping one of the techies would have torn it apart techniically if there were major flaws in my logic.
  17. Replies
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    828,338

    A couple of years ago I gave a lot of thought to...

    A couple of years ago I gave a lot of thought to building a 3 cylinder axial flow turbo 2 stroke, the idea was to use a commercial 2 stroke block with replacable liners, the head was to have 2...
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    7,485

    30mm is a lot of carb for 100cc @ only 6k, is it...

    30mm is a lot of carb for 100cc @ only 6k, is it the standard one?
    See if you can borrow a slightly smaller carb 28 or 25 the increased gas velocity might have a positive effect on crankcase filling...
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    7,485

    25 is pretty good for a 5 horse motor is this the...

    25 is pretty good for a 5 horse motor is this the Tohatsu one, what size/ make carb, what lower unit gear ratio, through the hub or over the prop exhaust, is it a liner powerhead & can you still buy...
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    15,471

    You'll find quite a lot more intake science in...

    You'll find quite a lot more intake science in The High-Performance Two-Stroke Engine by Dr. John C. Dixon. isbn 1 84425 045 8

    As it was first published in 2005 it's a generation newer than...
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    11,041

    Thanks Outlaw that answered my question, so...

    Thanks Outlaw that answered my question, so removing the cooling on the tuner makes is seem shorter to the exhaust pulses raising the "powerband" by 100+ revs.
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    11,041

    What does blocking the leg water outlet achieve?...

    What does blocking the leg water outlet achieve?

    Because when I've had them block accidently (not on a Merc) I burnt the paint on the leg didn't do the swivel rubbers a lot of good & melted around...
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    14,739

    You can make the pipe appear longer by squirting...

    You can make the pipe appear longer by squirting cooling water over it.
  24. Replies
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    8,418

    Have a look on you tube at NZ jet boat type...

    Have a look on you tube at NZ jet boat type vids, most of the glass boats have a Duralumin outer layer as a sacrificial skin for snow melt river work.
  25. Interesting question, is it the flow rate you...

    Interesting question, is it the flow rate you should be measuring or is it the fuels ability to atomize with varying oil percentages, or perhaps both.

    With a wide open carb attached to a decent...
  26. Replies
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    4,289

    More compression, tends to give more heat & a...

    More compression, tends to give more heat & a faster burn so you might well benifit from slightly reduced ignition advance.
    The pistons will also run hotter so increasing a jet size could have a...
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    26,997

    you might find prices on Malossi or Jasil's web...

    you might find prices on Malossi or Jasil's web sites.

    All of these companies provide bolt on extra power, for kids to use on their twist & go scooters.

    As for boat racing use just check out...
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    26,997

    Perhaps the hardest part is going to be lowering...

    Perhaps the hardest part is going to be lowering the revs,to a suitable range without the use of a huge crownwheel or by using a sexy planetary reduction box somewhere in the leg.

    Unless Ron has...
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    12,434

    You'd better tell them about the water conditions...

    You'd better tell them about the water conditions you plan to run this in.

    Not a lot of flat fresh water in Bermuda, (only in swimming pools) 40mph on south shore might be a very rough wet ride!
  30. Replies
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    It might be worth checking what the silicon...

    It might be worth checking what the silicon content was in the origonal pistons, JP only seem to do 10%.
    If I remember right high performance pistons have a much higher Si content to limit expansion.
  31. Replies
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    21,469

    Before you follow zul8tr thoughts, who I'd guess...

    Before you follow zul8tr thoughts, who I'd guess is bang on the money, & build a dividing wall.
    See if you can seperate the butterflys so that they are actuated by separate cables, if you have a...
  32. Replies
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    Check my maths please. A 12" x 12" prop will...

    Check my maths please.

    A 12" x 12" prop will have the same tip angle as a 20 foot prop with 20 foot pitch.

    A 12" pitch prop will only have a pitch angle of 45 degrees, 2.7" from the centre...
  33. Replies
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    12,178

    Looking at pictures of those props the pitch...

    Looking at pictures of those props the pitch looks more than 16 foot & the stuff I read said maximum revs 200.
    What was the hull speed?
  34. Replies
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    12,178

    As I understood it, slip is the difference...

    As I understood it, slip is the difference between the theoretical speed & the actual speed

    i.e. if you have a 12" pitch prop running at 5000 revs, your theoretical speed would be 12" x 5000 x 60...
  35. Thread: dyno??

    by Seagull 170
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    3,600

    Has anyone got any bright ideas on home built...

    Has anyone got any bright ideas on home built dyno's for under 12hp motors?
  36. Replies
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    15,604

    Was the opposed twin a common crankcase twin or 2...

    Was the opposed twin a common crankcase twin or 2 singles firing at the same time, in 69 this would be cross scavenged with fractured steel rods wouldn't it?

    High crankcase compression seems to...
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    82.5 would be just a number to OMC, their next...

    82.5 would be just a number to OMC, their next question would be where's that coming from? that's a full strip down & measure, that's the chapter I'd love to read.

    The next chapter if there is...
  38. Replies
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    194265 Well I for one, can't wait for you to...

    194265
    Well I for one, can't wait for you to start a new thread & let me have a look at that Konig stuff.

    If you lived a bit closer I'd be over trying to photocopy it for bedtime reading.

    If...
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    Thanks Smitty

    I dunno Sam, I thought that was an A+ answer.

    Clear & to the point, no numbers plucked from thin air, references quoted, & 100% accurate.
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    92,194

    Thanks that's fascinating, was a reason ever...

    Thanks that's fascinating, was a reason ever reached to account for these rises & is it safe to assume that due to your location all temps are in F?

    All the interesting info was garnered in the...
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    92,194

    194265 Where were you measuring those...

    194265
    Where were you measuring those temperature changes?
    coolant, plug, exhaust gas, or are we talking air cooled.

    Why were the manufacturers running avgas? wouldn't this give answers that...
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    92,194

    Was that benzene or butane Sam?

    Was that benzene or butane Sam?
  43. Replies
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    92,194

    I'm not sure it's as clearcut as that, there's a...

    I'm not sure it's as clearcut as that, there's a whole lot of other factors that could affect your conclusion.

    Motor design, types of bearings, cylinder wall type/condition, number & style of...
  44. Replies
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    92,194

    Do you stuff reed cages Tim.

    Do you stuff reed cages Tim.
  45. Replies
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    92,194

    That's a very interesting point, has anyone seen...

    That's a very interesting point, has anyone seen any figures or creditable paperwork on this area.

    What percentage of the semi particulate oil vapourises & joins the fuel & what stays as a...
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    92,194

    What I think Fred meant to say was " in...

    What I think Fred meant to say was " in competition engines lean doesn't increase power" as they're running as lean as they dare.

    I have no doubt that in motors that are not running on the edge of...
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    Impressive 55H figures Tim, are the test results...

    Impressive 55H figures Tim, are the test results on the net?
  48. Replies
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    Test first the 060 jet with the 25:1 & see if it...

    Test first the 060 jet with the 25:1 & see if it makes any difference, remember doubling the lube, might colour the plug.
    Freds the man to ask, he seems to have tried every permutation.
  49. Replies
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    I do! & have. Fully synthetic has sometimes...

    I do! & have.
    Fully synthetic has sometimes required a smaller jet.
  50. Replies
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    Sam fill a coke bottle with oil & then fill one...

    Sam fill a coke bottle with oil & then fill one with straight gasoline, then time how long it takes to empty the bottles, I know this is a bit extreme but it's just to prove a point.

    The...
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