Product Description
Yamaha FZR400/600 Ignition rotor and plate
Two options to fit the 400's either: 3TJ 4DX or 1WG 3EN
Two Options for the 600's either : 4JH or 4TV
This has to be amongst the very first mods you do for the track after taking your mirrors off - more bhp, quicker acceleration, quicker & easier direction changes, weight saving and all for the cost of a pair of tyres!
This computer-designed, CNC-machined rotor and pickup plate is machined from HE30 (plate)and EN1A (rotor) alloys. Coated in zinc passivate, the rotor is dynamically balanced, and weighs only 180g compared to the standard flywheel that weighs 1.6Kg. That's like having one and a half kilos removed from your crank allowing for much improved throttle response and quicker acceleration and better engine braking. Not only that but as you can see from the comparison photographs most of the weight of our rotor is in the hub near the centre of the crank where it will only be doing around 30mph at 14000rpm - the original rotor holds most of its weight 60mm from the centre of the crank so it's moving at around 200mph. It's easy to see how much difference this will make to the way your engine spins up. Gyroscopic forces from the engine are also reduced making the bike easier to tip in and change angle. The pickup plate is indexed in 1° increments so that the ignition timing can be manually adjusted from std to 8°advance. By reducing the flywheel inertia to a negligible amount, and finding the optimum ignition advance for your particular engine, a gain of between 3 to 5 Bhp can be obtained.
Obviously, as the generator is removed, either a fully charged battery or a race generator (also available) is required. We have never seen an FZR want less than 4 o advance over standard with a kit ignition, however people have suggested that 2 o retarded works better. Ours run between 7o & 5 o. Note: Standard Bar End Weights Make Good Flywheel Pullers for standard flywheel. To remove our rotor you'll need our extractor EX2PC listed separately.
When fitting please be careful to fully align the rotor keyway groove with the key, it does not protrude from the crank a lot and can easily slip when tightening.
