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Can you solve the mystery???

10 Jul 2020 15:43
OlSchool0097
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Can you solve the mystery??? #1
Hello All .. I cannot for the life of me find any info on this bike .. it says G3-101### on both the forks and the engine which makes me think it’s a YG3?? Does anyone know if it’s the same engine as the YG1? My father in-law got it from a barn find a few years ago and gifted it to me.

I’ve started taking it apart and need new rings and possibly a piston. Any help is much appreciated!

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10 Jul 2020 20:14 10 Jul 2020 20:32 by mdscott.
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Can you solve the mystery??? #2
I did a quick search and came up with this, Rotary engine forum. opps nevermind, it was those mini helicopter things. :haha

A few here have similar bikes, I sure something will come up. Not a lot if info on those bikes.
I have a 68 YG5T.

This might help.
yamaha-enduros.com/index.php/vintage-non...ual/viewdocument/412

Found this on ebay for a YF-1, those old Yamahas are very similar


Thanks Mark
Roseville, Ca.

'76 Bultaco 143 Frontera
'06 GL1800
'01 KDX220
'68 YG5T 80 Trailmaster
74 DT360
75 Norton
73 CB500K
63 C200
87 PW50
64 McClane Edger

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11 Jul 2020 08:57
OlSchool0097
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Can you solve the mystery??? #3
thanks!

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11 Jul 2020 09:12
MarkT
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Can you solve the mystery??? #4
The YG series was made for decades... YG3 is likely just not a model that was sold in the USA....

"G" means it's an 80 (actually 72cc). The "F" was a 50.

YG3 is likely to be virtually identical to the YG1 models we got in the US... looks like a YG1. Piston and rings from the YG1 should be compatible.

Just be sure to buy a matched set... Yamaha changed the ring and piston designs over the years so you need to make sure ring design matches the piston groove design.

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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11 Jul 2020 12:07
OlSchool0097
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Can you solve the mystery??? #5
Ok .. Thanks for all the info .. Helps a lot! Cheers!!!

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