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Thread: The 50

  1. #31
    Join Date
    1st March 2011 - 19:15
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    1996 Buell S1
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    Orewa
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    carb

    Quote Originally Posted by F5 Dave View Post
    Well there will be a Mikuni on deck in a couple of days. Think I'm running a 145 in my PWK, but its all relative to the engine & doesn't mean too much, heck I was on 280s on my old Mikuni non PJ flatslide.

    Often you run similar or larger jetting than the bike it came off as there is less suction.

    Often it is easier to tack weld on the threaded part of a bigger cage or some 12mm plate to extend a tiny 1/2 reedblock (like the MBs had) to fit a 4 petal reed then just devcon the gaps [edit seen spacer above]
    I have that spare cylinder that I have opened up to take the bigger block and I had planned on fitting the whole lot but as mentioned earlier one of the rings were munted.
    The original carb had an 80 main, thought I'd start around there.

    I have a piston on it's way from blighty that may or may not be of any use to me but if I can make it work it will relieve a whole heap of issues.

  2. #32
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    1st March 2011 - 19:15
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    1996 Buell S1
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    Piston transplant

    I bought a cheapish Aprilia RS50 piston to see if I could make it fit the Honda, I have quite a difference in piston height 2mm.

    The Aprilia small end bearing is 15mm diameter and 16mm long whilst the Honda one is 17mm diameter and 14mm long. Measuring the inside of the piston where these sit they are as near as damn it the same and I reckon I can use the Honda small end in the Aprilia piston.

    2 Questions

    1: Will I be able to make the piston fit ?
    2: Is there any reason I cannot use the Honda small end
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  3. #33
    Join Date
    25th March 2004 - 17:22
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    RZ496/Street 765RS/GasGas/ etc etc
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    Wellington. . ok the hutt
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    So the Apr piston is the one on the left & is taller? Pity. Peg positions should avoid boost port. Vivid them & push down bore if that close you need to check.

    Are the rings similar thickness? Should be able to get more racy Aprilia pistons.

    Confused by your measurements. Same pin OD? Doesn't make sense.
    Don't you look at my accountant.
    He's the only one I've got.

  4. #34
    Join Date
    1st March 2011 - 19:15
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    1996 Buell S1
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    Orewa
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    pin

    Quote Originally Posted by F5 Dave View Post
    So the Apr piston is the one on the left & is taller? Pity. Peg positions should avoid boost port. Vivid them & push down bore if that close you need to check.

    Are the rings similar thickness? Should be able to get more racy Aprilia pistons.

    Confused by your measurements. Same pin OD? Doesn't make sense.
    The Wrist pin is the same size 12mm, but the Honda small end is much fatter at 17mm verses the Aprilia's 15mm which means the Aprilia one is too small for the rod.

    The pins on the piston look pretty good for spacing just inverted if you see what I mean, I can't push it down the bore as it is .3 bigger meaning a re-bore will be required


    I only bought this cheaper one as I am a tight ass and did not want to blow heaps on something I could not use.

  5. #35
    Join Date
    18th May 2007 - 20:23
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    RG50 and 76 Suzuki GP125 Buckets
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    Auckland
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    Quote Originally Posted by cotswold View Post
    I bought a cheapish Aprilia RS50 piston to see if I could make it fit the Honda, I have quite a difference in piston height 2mm.

    The Aprilia small end bearing is 15mm diameter and 16mm long whilst the Honda one is 17mm diameter and 14mm long. Measuring the inside of the piston where these sit they are as near as damn it the same and I reckon I can use the Honda small end in the Aprilia piston.

    2 Questions

    1: Will I be able to make the piston fit ?
    2: Is there any reason I cannot use the Honda small end
    I think:-

    1: That there are no problems here, you just raise the cylinder another 2mm so the top (timing) edge of the Aprilia piston is in the same place as the Honda would have been. You may have to adjust the inlet timing edge on the Aprila piston but that is easy to do.

    2: If the Honde L/E brg fits the rod and the Aprilia piston pin fits the Honda brg when its in the rod and the side clearance of the Honda L/E brg inside the Aprilia piston is only a mm or two or three, then I would expect that to work OK too.

  6. #36
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    25th March 2004 - 17:22
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    Just be aware that the Honda pistons angle at the small end in so clearance is more at the bottom than at the top. How much clearance is there total on ap piston?
    Don't you look at my accountant.
    He's the only one I've got.

  7. #37
    Join Date
    1st March 2011 - 19:15
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    1996 Buell S1
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    Orewa
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    wrist pin

    Ideally I need a wrist pin (or small end) bearing 12x17x16 I have found 12x17x15 and that will have to do

  8. #38
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    25th March 2004 - 17:22
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    Yeah washers in the piston are a drama, but found out the hard way that I needed them using RD piston as there was room for the bearing to climb the rollers to the edge of the rod. If you can't expose any rollers you will be sweet.
    Don't you look at my accountant.
    He's the only one I've got.

  9. #39
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    1st March 2011 - 19:15
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    Orewa
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    pistons

    http://www.barikit.com/index.php?opt...emid=8&lang=en


    May be useful to some of you. Found what I
    wanted here.

  10. #40
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    1st March 2011 - 19:15
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    1996 Buell S1
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    Orewa
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    progress

    just made a spacer from donated metal ( thanks Daz ) to lift the cylinder up 1.2mm. This will get the port timing closer to what I am told I need. Should have it ready for next weekend.
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  11. #41
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    25th March 2004 - 17:22
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    300 on the ex and 104 on the transfers else it won't be peaky enough
    Don't you look at my accountant.
    He's the only one I've got.

  12. #42
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    1st March 2011 - 19:15
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    port timing

    Quote Originally Posted by F5 Dave View Post
    300 on the ex and 104 on the transfers else it won't be peaky enough
    I was thinking more like 118 and 80 but if you think I should go for 300

  13. #43
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    25th March 2004 - 17:22
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    I always talk open periods, but yes a joke. Don't go too far. My 13k peak RG is 196 ex 129. I have run up to 202but it was a dead end.
    Don't you look at my accountant.
    He's the only one I've got.

  14. #44
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    1st March 2011 - 19:15
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    manifold

    cant oval bore but matched this up to my port and the pipe I'm going to cobble up to it for the weekend
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  15. #45
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    1st March 2011 - 19:15
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    pipe thanks

    thanks to the 2 boys down the line who sent me up some exhausts and Rob for another one that sacrificed its silencer and Mr Steer for welding up the bits I handed him (over a 5 hour period) the 50 now has a much lighter pipe, not sure how it will go but it sounds better if nothing else.

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