ZXR400 vs. RVF & VFR

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I have a race RVF, and just finished rebuilding a road ZXR 400. The zxr (as has already been said) seems to flex and wallow, not something i was very keen on. My ZXR is a missile, it only has free flow filter and micron pipe but it's bloody quick. The downside is the engine parts like rocker arms and cams are not built to last, i had a doner engine and 4 of the rocker arms had lost their hard facing and one had worn completly damaging the cam lobe. I have made one good engine out of the 2 i had so you will need a good supply of spares if you are going to be tuning it alot.
If your going to be pulling the engine apart on a regular basis then you can check for wear and replace as necessary. The zxr is noticeably lighter and as a race bike i think it would make a very good wepon (as the results seem to prove both with you and here in the UK).

+1 for the rocker arms...buy them up from ebay whenever i can...better than the £25 new from kawasaki...

engine wise, the top zxr's are putting out 80bhp and its possible to get it down to low 140kg wet weight if you have deep pockets.

[VtypeV4]

There's a good write up in this months edition of Practical Sportsbikes. They pitch it against the NC29 CBR rather than the VFR but it's interesting none-the-less.

[g-force performance]

Any chance anyone has a used, even blown up, ZXR400 cylinder head with complete valve train they want to sell (even blown up)?

Also, anyone have that issue of Practical Sportsbimes mentioned above?

Thanks

Mike Norman
G-Force Engine Development
Www.mngforce.com