KR-1S.co.uk Forum

All engine numbers start with KR250B on these bikes.
You need to check the chassis number.
KR250B chassis are KR1
KR250C chassis are KR1S
Of course if it is an '88 model, then it's a KR1 for sure.
Most parts are directly interchangeable, while others need to be swapped as a package.

none at all.

Aleks82 wrote:is there any difference between a 88 and a 89 kr1 then? Coz most info i find is for 89 - 90 something models

The KR1 arrived in the UK a year after Japen, so a 88KR1 was actually sold in the UK in 89, same with the 89 model. We then missed the KR1S C1 in the UK cause in 1990 we had the B2 (89)instead. We then caught up with everyone else in 1991 with the C2.

Aleks82 wrote:so are the B1 and the B2 parts the same? in the top end that is, eg pistons/rings etc. ?

All KR1 and KR1S variants use the same pistons/rings and gaskets.