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Need Ty175 Shift Drum, Advice On Which Ty250 Piston

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trialguy
in Yamaha

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Hi, I need a shifter drum for my 1978 ty 175 and would like to install the ty250 piston in my overbored cylinder to up the displacement to 192cc. Please advise which 250 piston I need, pre-mono or?

Cheers, Guy

  • Quote

    Try feebay for the shifting drum. As for the piston the older ty250 twin shock piston will work, but you will need to bush the wistpin bore in the piston. Or find a wristpin bearing in the right size. The TY 175 wistpin is 16mm and the TY250 wristpin is 18mm.

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