ALL FIRED UP ON SPEED­ING BUL­LET

NT News - Motoring - - FRONT PAGE - By MARK VOISEY

THE first of Yamaha’s new sports power packs — the F225C — is driv­ing a Gold Coast ski race team.

The F225C, de­signed for the per­for­mance boat mar­ket, is based on the four-stroke V6 225hp model and suits hulls with a 20-inch tran­som height.

It means the pow­er­head is po­si­tioned lower on the hull for a lower cen­tre of grav­ity and bet­ter han­dling at high speed.

The first to ar­rive on our shores is now on a 2009 model Bul­let 1850 ski race boat — owned and raced by ski race vet­eran Chris Wil­liams, who is run­ning the en­gine ‘‘stock stan­dard, straight out of the box’’.

He re­ports ‘‘zero is­sues’’ and a drop-in fuel con­sump­tion.

While it looks much the same, un­der the sports en­gine cowl­ing is a host of changes, in­clud­ing an exclusive com­puter man­age­ment sys­tem to match the en­gine’s op­er­a­tional char­ac­ter­is­tics.

The F225C also has longer in­take man­i­folds, a new de­sign of up­per­case for the L-drive shaft and a new pis­ton de­sign which is said to de­liver bet­ter throt­tle re­sponse.

The lower unit with stock 30:15 ra­tio is the same as that on the F250, along with the sin­gle in­let throt­tle body fuel in­duc­tion sys­tem and the vari­able camshaft sys­tem.

‘‘My pre­vi­ous Bul­let 1850 had a Yamaha 225hp two-stroke en­gine on the tran­som,’’ Wil­liams said.

‘‘With the new F225C on my boat, there is ab­so­lutely no doubt that this new en­gine from Yamaha is more

pow­er­ful.

‘‘I am cur­rently run­ning a 29-inch pitch pro­pel­ler and the GPS is show­ing 79.6mph (128 km/h) with the en­gine bounc­ing off the 6100rpm rev lim­iter.

‘‘With the right prop, maybe a 32-inch or 34-inch pitch, we’ll eas­ily see speeds in the mid ’80s. And at 276kg, this is the heav­i­est of the three Bul­let hulls I have raced, al­though the man­u­fac­turer rates this as a semi­light weight hull.’’

The Bul­let is rigged with a stan­dard in­ven­tory of per­for­mance gear, from a hy­draulic jack­ing plate, foot throt­tle and foot-op­er­ated trim but­tons to hy­draulic steer­ing.

The en­gine, which weighs in at 265kg, will come with a four-year man­u­fac­turer’s war­ranty.

SHOT OUT OF A GUN: The first of Yamaha’s new en­gines to ar­rive in Aus­tralia is now on the back of a 2009 model Bul­let 1850 ski race boat

SPEED­ING UP: Race vet­eran Chris Wil­liams is a fan of the new en­gine

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