SLIP­PER CLUTCHES EX­PLAINED

Motorcycle News (UK) - - THIS WEEK -

When you ac­cel­er­ate the en­gine turns the rear wheel, close the throt­tle and the re­verse hap­pens as the rear wheel’s mo­men­tum at­tempts to turn over the en­gine, this can lead to en­gine dam­age due to over­revving as well as up­set­ting the rear sus­pen­sion and com­pro­mis­ing rear grip. In­side a slip­per clutch the cen­tre has been re­designed with five or six little ramps so that it rises when this hap­pens. Once it has risen about 1mm, it then pokes the pres­sure plate off the top of the clutch, which has the same ef­fect as if you had lightly pulled in the clutch lever. This elim­i­nates the ef­fect of the rear wheel on the en­gine, re­duc­ing over-revving and set­tling down the rear sus­pen­sion as you tip into the cor­ner. As soon as the throt­tle is opened again, the clutch smoothly re-en­gages.

Neil Spald­ing OWNER OF SIGMA PER­FOR­MANCE

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