Hayabusa engine identification – K7 or K8?

[dunc_sx]

Hi folks,

How do you identify one from the other when installed in a radical (prosport), hopefully there’s an easy way?

Cheers,

Duncan.

[Martin B]

Gen 2 has the inlet ports paired (i.e. larger gap between the two middle ports compared to the smaller gap between the outer ports). Gen 1 inlet ports are equispaced.

Also if it still has the Gen 2 output shaft, it is longer than the gen 1 so the output shaft sprocket is dished so the sprocket teeth line up with the rear sprocket.I can send you some piccies of the gen 2 if you want?

Gen 1 also has recirculation ports above each of the exhaust ports, the Gen 2 has not got these above the exhaust ports.

Cam covers are slightly different (recirculation ports go through the cam cover to the pair valves on the gen 2), no pair valves in the Gen 1 cam cover

Edited by Martin B on Wednesday 17th May 19:36

[scooby151]

Are the engine mounting points the same by any chance?

[Martin B]

Yes, I have a gen 2 in my clubsport with the normal Radical mounts for the prosport/Busa installation

[dunc_sx]

Great information Martin, no need for photos that's perfectly clear. Hope you received my gear change linkage photo OK and it was of some help?

Cheers,

Dunc.

[Martin B]

Yes thanks for the photo, I have made a new one along those lines.

[scooby151]

Thanks

[Coldaswell]

If Radical don't change the original engine block number, then i think it began as a K7 if the first letter is W (denoting 1200-1299cc) or K8 if the first letter is X (denoting 1300-1399cc).

Happy to be corrected though as I'm not certain of this.