Hi guys has anyone used one of these as i am considering this as part of an upgrade package I am planning for the global along with various induction upgrades.

http://www.moto-racing.co.uk/item--Barnett-Clutch-Coil-Spring-Conversion-Yamaha-YZF-R1--R1+Barnett+Conversion.html

so has anyone used this and if so are they any good? The engine is a Yamaha 4xv so if anyone uses something different/better feel free to suggest it?

BARNETT CLUTCH SPRING CONVERSION KIT - YAMAHA R1 98-03 | eBay

Same item, but £6 cheaper and includes p&p

No idea about differences from standard unit and would be interested to hear benefits. You having problems or just looking for upgrade?

http://www.locostbuilders.co.uk/viewthread.php?tid=177379

No real problems but if I upgrade it before I tune the engine it wont be a problem later. If i tune the engine the way I intend to I hope to eventually have an increase of around 30% in power which will be way out of the tolerance for a standard clutch