Fast Bikes - - TECH TALK -

1 Sigma slip­per clutches use air­frame qual­ity alu­minium to make their clutches, as this guar­an­tees the best com­pro­mise on weight and strength.

2 If you’re won­der­ing whether your slip­per clutch is func­tion­ing prop­erly, you should test it in ev­ery gear in a safe en­vi­ron­ment, such as a race track. On re­leas­ing the clutch, the rear wheel should re­frain from lock­ing up and the revs should not be fluc­tu­at­ing ex­ces­sively as the engine and wheel speeds are matched by the clutch. Also, feel for the reg­u­lar puls­ing on the clutch lever, as this is a pos­i­tive sign that things are work­ing as they should be.

3 Mo­toGP clutches will prob­a­bly only last two or three races, while the ac­tual plates and springs will need chang­ing af­ter ev­ery ses­sion.

4 Ev­ery slip­per clutch de­sign is unique to the bike it’s fit­ted in. There are some com­mon cross­over parts, but ev­ery slip­per clutch has to be crafted and honed to achieve the right fit­ment and char­ac­ter­is­tics re­quired.

5 To cope with ex­treme power out­puts, such as that from 400bhp turbo tuned Hayabusas and the like, con­ven­tional slip­per clutches sim­ply aren’t up for the job. This means that spe­cial slip­per clutches have to be pro­duced, fea­tur­ing ex­tra plates and springs, as well as a much more heavy duty bas­ket. Oth­er­wise, the sheer power would de­stroy the unit on ap­pli­ca­tion.

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