Motorcycle News (UK) - - Garage -

1 Get into the groove Suzuki’s cen­trifu­gally-op­er­ated sys­tem is built into the in­take cam sprocket and an ad­ja­cent guide plate, us­ing steel balls and slanted grooves to ro­tate the sprocket and re­tard the in­take valve tim­ing at a pre-set rpm, which adds to the high– rpm power.

The ra­dial grooves get shal­lower to­wards the outer edge, so as the balls move out­ward they also need to force the two halves apart – which al­lows the camshaft to ro­tate a few de­grees in re­la­tion to its drive sprocket, ei­ther ad­vanc­ing or re­tard­ing the valve tim­ing in the process.

2 High-tech sim­plic­ity The beauty of the sys­tem is its com­pact sim­plic­ity and seam­less oper­a­tion. All through its de­vel­op­ment Suzuki Mo­togp rac­ers have never been able to feel or de­tect when the sys­tem moved to change the valve tim­ing, un­like older sys­tems fit­ted to other firms’ road bikes. The only thing Suzuki rid­ers will feel is a seam­less and sig­nif­i­cant increase in high-rev power.

3 Spring tun­ing

At low revs the spring over­comes the cen­trifu­gal force act­ing on the steel balls, push­ing them back to­wards the cen­tre of the phaser so the tim­ing is shifted to its ‘ad­vanced’ po­si­tion, boost­ing low-end torque and im­prov­ing throt­tle re­sponse. As en­gine speeds increase, the cen­trifu­gal force pushes the balls out­wards, re­tard­ing the tim­ing and boost­ing peak bhp. The Mo­togp guys can change the ten­sion of the spring fit­ted to the GSX-RR’S en­gine which will al­ter the revs at which the tim­ing changes.

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