OzVMX Forum

Clubroom => Tech Talk => Topic started by: Nathan S on December 22, 2012, 09:18:01 am

Title: Big bore PW50.
Post by: Nathan S on December 22, 2012, 09:18:01 am

In among yesterday's panic, I discovered that one of the PW barrels is 4mm oversize.

Anyone heard of this before? More to the point, anyone know what the piston is from?
No markings on it except the usual for Yamaha "ART" cast into it. Seems to fit straight in - no barrel spacer, conversion bearing or anything like that.

Title: Re: Big bore PW50.
Post by: vandy010 on December 22, 2012, 10:13:25 am

most of the "ART" pistons should have a number inside them.
 :)

Title: Re: Big bore PW50.
Post by: evo550 on December 22, 2012, 10:58:33 am

Your caliper wasn't zero'd  ;)

What dimensions was the PW 80 bore and stroke might have come from there.

Title: Re: Big bore PW50.
Post by: EML on December 22, 2012, 11:44:25 am

Peewee 60???

Title: Re: Big bore PW50.
Post by: SON on December 22, 2012, 04:11:50 pm

YT60 Trimoto Trike???

Title: Re: Big bore PW50.
Post by: head on December 22, 2012, 04:56:02 pm

It is the Yamaha 60cc Tri Zinger. Same motor as PW but was 60cc. We still have one that we had new from 1984. Great fun.