ALL FIRED UP ON SPEEDING BULLET
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
‘‘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