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Makotosun

Honda gyro

  • Knutco11
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Honda gyro was created by Knutco11

Just curious if anyone has seen oversize pistons for these funny 3 wheeled contraptions.  I acquired one recently, but I'm having a tough time finding anything but standard size pistons.  Have a good day everyone, thanks for any help!
15 May 2024 06:06 #1

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Replied by MarkT on topic Honda gyro

Treatland in California specializes in the smaller bikes and vehicles...  if you don't see what you need, contact them.  They found and ordered me some hard to find parts for one of my DT50's a few years ago.  They are helpful and knowledgeable with a passion for the small vehicles.

Hint:  Sign up with your email...  several times a year they email a code that gives a discount on everything in the store. No spam.  All I get is the sale notices.

I searched "Treatland Honda Gyro" on Duck Duck Go and this was the first result...  www.treatland.tv/malossi-70cc-47mm-cylin...gyro-kit-31-6170.htm  So they obviously have some knowledge of the Gyro.
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
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15 May 2024 08:07 #2

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Replied by Paul@PJME on topic Honda gyro

Do you have the old piston out of the engine ? if you can put up some measurement i can cross reference it to other honda pistons.

Bore Size
G-Pin Dia
Measure from the top of the G-pin to the edge of the crown
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15 May 2024 12:38 #3

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Replied by Knutco11 on topic Honda gyro

Thank you Markt for that info. Yes I saw the big bore kit too lol.. I'm gonna wait, because it looks like I'd have to do some extensive case work to make it fit. I believe mine is an 86', USA model.
Paul, I'll get some measurements soon. 10mm pin and I believe 41mm stock bore. I've read that honda spree pistons work, but cannot find any oversize for that either.
15 May 2024 13:17 #4

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Replied by MarkT on topic Honda gyro

I doubt you have to machine the cases...  Malossi kits are generally bolt on but the Treatland reviews have some minor mods for install on US models.  Anyway, calling Treatland and asking them about pistons and/or the big bore kit might get you some answers...  they've always been very helpful. 

That is if Paul at PJME can't find you something...

P.S.  Malossi sometimes "exaggerates" the displacement of their kits from what I read in the past.
1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
15 May 2024 17:04 #5

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Replied by Paul@PJME on topic Honda gyro

I think it maybe this one

MODEL NT50
BORE SIZE 41.00 mm
CROWN HEIGHT 15.50 mm
OVERALL LENGTH 45.00 mm
DOME HEIGHT 4.00 mm
G.P. ⌀ 10.00 mm
RING PEG POSITION 14.00 mm
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17 May 2024 07:44 #6

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