KR250A track bike project.

[Gerrit]

I recently obtained various bits and pieces as the bare bones of a KR250A project, frame No. KR250A-009209 and engine no. KR250AE-009255. As frame and crankcase set came from the same source (a breaker's in France) and the numbers are close it's safe to assume they belong together.
The intention is to build a track bike so originality is NOT the goal. Front forks will either be KR-1/KR-1S or RGV250 upside down fork assembly. As for the weird standard rear suspension, this will have to go. Nobody makes a replacement shock so an alternative setup will have to be designed, perhaps a copy of the 1982 GPz550 setup if there is enough room to squeeze that in. If not, a copy of the Yamaha monoshock setup.
Wheels- 17" front and rear. KR250 race fairing and seat, if I can find a source for them.
The frame has been taken apart and first step will be to weigh the bits.

[Gerrit]

Weight of main frame: 6.16 kg.
Weight of rear subframe: 2.315 kg.
Weight of LH side plate: 1.33 kg.
Weight of RH side plate: 1.385 kg

Total weight of frame minus nuts and bolts is 11.19 kg.

[StrokerBoy]

Sounds great ! Looking forward to seeing it progress.

[Gerrit]

Surprisingly, the steering head of the KR250A is 5 mm longer than that of the KR-1(S), 195 vs 190 mm, which means the steering stem of the KR-1(S) lower fork yoke is 5 mm too short, requiring a longer stem to be made.