YZ 400C piston

[Rider]

Not much experience with YZ,s just pulled a unmolested 400C I've had under a tarp for several years out to see if it's worth restoring. The bikes complete with air forks ,side stand , sump guard and original air box. My first dilemma is the bore 85mm as apossed to the original size of 82mm. Are pistons available ? The bore may be usable with a light hone with approx .002-.003" wear. Any advice would be appreciated.  Thanks Terry.

[Tony H]

C-D-E  were 85mm. The F had the 82mm.

[ARN]

and the c piston is different to d and e

[Rider]

Thanks, does that mean it's on standard bore ? The Clymer manual lists 400 models as 82mm which through me .

[motomaniac]

Thanks, does that mean it's on standard bore ? The Clymer manual lists 400 models as 82mm which through me .

yes 85m is standard , 82mm was one year,79, only

[TT5 Matt]

I've got a set of std rings going cheap if needed

[Rider]

Thanks for the responses and the offer of standard rings Matt, but as its on standard bore I will keep my eye out for a first os piston kit to freshen it up while it's apart.
Cheers Terry.