GS750 big bore kit

[KiwiGreg]

I’ve purchased a GS750C that has a 850cc big bore kit installed. Apparently it’s a Yoshimura kit.
I’ve never heard of a Yoshimura big bore kit, is there such a thing?

[zed1015]

II've never heard of a Yoshimura big bore kit, is there such a thing?

Yes! It will likely be an older modification or NOS kit if fitted recently as Yoshi piston kits for the GS750 don't appear to be listed on their current site.

PISTON | Yoshimura Japan

[Nessism]

Yoshimura was the driving force behind Suzuki's racing program in the USA, during the GS era. They sold piston kits, exhaust systems, cams, etc.

Some of their piston kits were hard core with high compression. Hopefully yours will get along with modern pump gas...

[KiwiGreg]

Many thanks gents - I was getting a little nervous.
I think I’ll go back to the seller and see if he has any further info he can share. He purchased the bike in 2021 and put the Yoshimura kit in in April 22.
As far as I can tell it’s done 97km in the last 8 years and about 10km in the last 3 years.
Any running in tips please ?

[Nessism]

Just drive it in a normal fashion. No racing around, or constant speed droning for long periods of time for a couple hundred miles.

[KiwiGreg]

Thank you for the advice