FJ Harris Framed Racer

[fj1289]

FJools - do you have more info on his entire bike?!   Engine development, frame and suspension details, race results, etc!

I was picking Roger Winfield's brain at the recent Phillip Island International challenge.

He builds the Harris FJ1200 F1 bikes that Jeremy McWilliams, Ryan Farquhar, Conor Cummins and another rider were racing.

These bikes are horn ! Using XJ1300 cases and cylinders with the FJ heads, most parts interchange with a bit of fiddling. The rear lower LH engine mount is modified as they used to break off with the engine trying to twist under load. It is bored out right through to the RHS and a sleeve welded in.

This year he has 6 speed boxes fitted and R1 slipper clutches. When questioned about the gearboxes he agreed that they were the weakest point of the engine but in general the engine was much stronger than the XR69 Suzuki replicas he had been using, if no faster (to date).
I thought the gearboxes may have been R1 but they are specially built. He wouldn't say a lot but his business is in gear manufacture and he may have worked with Nova to achieve them. Their only issue all weekend was grabby clutches which slipped when hot. An extra steel plate solved that and the grabbiness was being dialled out by adjusting the slipper clutches.

[FJools]

I'll reply to this later - I have to try and remember all the details I was given, and having just woke I nee a coffee first 

[Flying Scotsman]

Are there any more pictures ?.I would love a 6 speed gearbox 

[FJools]

I had quite a busy event and didn't take that many photos, more is the pity !

The Harris chassis can be bought in kit form from Harris, I believe its the F1 version, not the XR69 replica.

Check out their website there is a pricelist with each component part listed. As for engine plates I'm not sure if Harris provided them or the Winfield set up.

From what I can remember, the cases are XJ, as are the cylinders purely because they are Nicasil coated. The head is a flowed FJ12 with bigger valves. Not sure about the pistons. Std rods and crankshaft. He picks up engines with about 20,000 miles on them cheaply.
The rear lower engine mount is modified as previously mentioned.
Rear Suspension is Ohlins rear and front forks are 41mm XR69 replica with Ohlins cartridges.
The alternator & starter are removed. Dymag 17" wheels with Dunlop slicks 190 section rear.
The bikes have R1 slipper clutches and bespoke 6 speed boxes.
All the bikes had breather problems which they were working on throughout the weekend. Conor Cummins bike was blowing 500ml out per race !!
This was satisfactorily resolved by having a local shop manufacture a breather take off plate where the alternator mounts - a dead space high up in the cases.