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.FZR400 Lightweight Race Generator / Alternator kit

£612.36 
SKU: YRG400-C 
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Lightweight race alternator including intelligent reg/rec

Yamaha FZR400  YRG400-C Race Generator kit 

This is the complete race generator kit including the lightweight flywheel, stator, mounting plate, cup fasteners, connectors and specific regulator / rectifier.

It is designed for those who want to race long distance races such as the Manx or who don't want the bother of having to charge batteries for every race and the possible embarrassment of having a flat at the time of the race.

Designed to work in conjunction with our lightweight race ignition flywheel and adjustable pick-up plate which preclude the use of the original generator rotor.

This generator is designed to fit inside the starter motor drive cover and as such is not suitable for bikes which require a starter motor.

Significantly lighter than standard, offering higher output than 'race kit' versions, providing increased throttle response,less gyroscopic forces and more bhp everywhere.  It is designed to provide charging for longer races with minimum energy cost.

Typical gains on a standard bike are around 4-5bhp and generally the higher the state of tune of the bike the greater the gain.

This state-of-the-art alternator uses a tiny 45mm diameter rotor (most of which is a thin plate to bolt it to the starter clutch), weighing only 146g.  This significantly reduces the effective weight of the crank by not only reducing the weight of the rotor, but also by reducing the radius over which this weight acts. 

Standard rotors are around 128mm in diameter (compared to ours at 45mm), so the speed of the edge of the rotor is much higher - for example at 14000 rpm the standard rotor edge is travelling at 210mph, our rotor edge is only travelling at under 74mph.  Any motorcyclist knows that it takes significantly less time and effort to accelerate up to and stop from 74mph than it does with a vehicle 7 times the weight to and from 210mph; this translates to much improved throttle response, faster acceleration and reduced gyroscopic forces which allow the bike to lean over easier.

For long range races (such as the Manx) running total loss is a risky business or virtually impossible.  Standard road alternators are big and heavy, designed to run headlights etc and need to be able to supply significantly more power than you will ever need on a race bike.  This means you can use a considerably smaller system, reducing the weight of the crankshaft assembly.  

Most race kit generators have a smaller rotor with less windings running single phase in the stator so that they produce less outright power (and accordingly take less power from the crank to generate the electricity), and use a standard reg/rec.

The problem with this is that you have to rev the engine quite hard to produce any useable power and any excess electricity created is still converted to heat in the reg/rec and thrown out the back of the bike.

Our generators also use a small rotor but our windings are 3 phase and have a lot of turns of fine wire.  This allows us to provide strong and consistent power at lower revs, but the clever part is in the reg/rec.  The reg/rec contains a switching system which cuts the generating power when the desired voltage is reached and therefore the power is not taken from the crank to convert to unwanted electricity in the first place.  This is why our reg/recs run much cooler than standard models and why you cannot use our generators with a standard reg/rec as the generator would be under load all the time creating excessive heat in the windings.


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