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500 EXC-F:<br />
For 2017, the KTM 500 EXC-F boasts<br />
notable weight savings for a higher-thanever<br />
power to weight ratio.<br />
At the same time, the enhanced mass<br />
centralisation and geometry delivered by<br />
an even more compact engine layout,<br />
among others, makes for an increase in<br />
rideability, which is absolutely essential<br />
to convert the power into a true racing<br />
benefit.<br />
The 500 EXC-F’s fuel-injected engine<br />
has been redesigned in order to make it<br />
the most compact and lightweight 500<br />
on the market, while still delivering strong<br />
torque and power figures across the<br />
entire rev range thanks to a revised single<br />
overhead camshaft cylinder head and the<br />
latest-generation electronic fuel injection.<br />
450 EXC-F:<br />
The MY17 450 EXC-F’s fuel-injected<br />
SOHC powerhouse has been redesigned<br />
with the aim of making it the most<br />
compact and lightest 450 on the market,<br />
while delivering great torque and power<br />
figures over the entire rev range.<br />
There’s a re-designed single overhead<br />
camshaft cylinder head and the latest<br />
Keihin Engine Management System with<br />
electronic fuel injection featuring an allnew<br />
42mm throttle body, a new feature<br />
on all MY17 EXC-F models.<br />
Thanks to its unique injector position,<br />
the 450 EX-F is said to feature a more<br />
direct response than ever before. At the<br />
same time, an Euro IV homologation<br />
makes clear the environmental<br />
performance is also on par.<br />
350 EXC-F:<br />
For MY17 the 350 EXC-F has once again<br />
been re-designed to be more compact<br />
and lighter while delivering increased<br />
torque and power across the entire rev<br />
range. The new design featuring an<br />
optimised shaft configuration makes the<br />
engine 20mm shorter for added mass<br />
centralisation and increased rideability.<br />
A major benefit of the new design<br />
is the weight reduction by which,<br />
including the electric start system, is<br />
down to 28.5kg, a 1.9kg decrease over<br />
the previous model. Two overhead<br />
camshafts activate friction-optimised<br />
finger followers, now with a 30 percent<br />
harder DLC coating. Their revised timing<br />
is optimised for strong low-end torque.<br />
Four lightweight titanium valves with<br />
32 DIRT & TRAIL MAGAZINE JULY 2016
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