OzVMX Forum

Marque Remarks => Yamaha => Topic started by: Dono113 on May 31, 2013, 10:04:18 am

Title: 1983 YZ80 Rebuild
Post by: Dono113 on May 31, 2013, 10:04:18 am

pistons for for a 83 yz80 will later years fit?? Rebuilding a motor on it's first over, recommendations anyone

Title: Re: 1983 YZ80 Rebuild
Post by: Viper666 on June 06, 2013, 10:31:28 am

Wiseco make them up to 2mm over. 82J & 83K are the same. PW80 up to 2006 are the same bore and stroke (47 x 45.6) but I would think the skirt is different, probably not as strong either.

From 84 they are 48 x 45.6 but have 4 different part number. Possibly just extra windows or skirt design?

I used to have a YZ80B in my youth. These were only 72cc & had 2 windows. I broke a piston which in turn broke a piece of the bore that stopped you boring passed 2mm. With this gone my local dealer suggested using a D piston which was 2 mm bigger & had 3 windows. Absolutely flew.

Point being, later pistons may/should work with a little fiddling but I would suspect the Wisecos are still available?


YZ80 1982-83 47 47.00 *477M04700 B.O.D. 1850CD S538 W4050 B1043
x 47.50 *477M04750 B.O.D. 1869CD 1983 $16.96
45.6 48.00 477M04800 $108.00 1890CD CW12 $21.33
48.50 *477M04850 B.O.D. 1909CD
49.00 477M04900 $118.00 1929CD

Title: Re: 1983 YZ80 Rebuild
Post by: BETRIC on June 07, 2013, 06:32:45 am

1983 YZ80 piston kit 2ND O/S $69.99USD + shipping on US evilbay item #171037329166 ;)

Title: Re: 1983 YZ80 Rebuild
Post by: Dono113 on June 07, 2013, 09:28:10 am

Thanks boys, ordered last night from the US ;D