YMA is pleased to announce a new locally developed variant to
its comprehensive motocross lineup… the
powerful and compact YZ144 two-stroke racer.
The YZ144 has been developed in Australia primarily to compete
in up to 150cc two-stroke classes where it will line up alongside
juniors on similar capacity machines and 250cc four-strokes in the
senior Lites class.
The new machine is based around YZ125 but features increased
power across the rev range and has been thoroughly tested to ensure
the high level of reliability customers expect from Yamaha
products.
The combination of a powerful yet reliable 144cc engine mated to
six speed gearbox fitted into a lightweight YZ125 chassis is sure
to be a serious contender not only in the Junior up to 150cc
twostoke class but also MX/SX Lites and Class 1 off road
competition where two-strokes up to 200cc compete. And it is
guaranteed to offer a high level of excitement to thrill seeking
dirt bike riders whose main goal is fun.
The YZ144 has been developed in-house by Yamaha Racing
Development (YRD) following intensive research and testing.
It features modifications to crankcase, cylinder and head as
well as custom made piston and ring to produce a bore and stroke of
58mm x 54.5mm (= 143.9cc).
In order to aid and promote maintenance, each YZ144 is fitted
with an hour meter, Servicing intervals are as per YZ125
recommended intervals. This is not a backyard bolt-on kit and due
to the amount of machining work involved, there is no plan to offer
the parts as a kit. The following modifications have been made to
the standard YZ125:
- Modified crankcase set
- Modified cylinder and cylinder head
- Modified L+R power valves
- 58mm custom made piston (made in Germany)
- Custom made piston ring (made in Germany)
- Hour meter
- Graphics set (front guard, rear guard, L+R radiator
shroud)
- Carburettor jets
All other specifications are as per YZ125, it even sports the
standard YZ125 exhaust system. Dyno tests in this
‘as sold’ standard trim
reveal a healthy increase in power across the entire rev range (see
graph above). Owners wishing to increase power further will have
several other options available.
For example, Cisco's Race Tuning has several power up levels
available that include:
- Custom ported cylinder
- Specific 144cc exhaust system developed by HGS
- Crankshaft modifications (1mm off set crank pin) that will
provide a further capacity increase to 149.2cc (class limit is
150cc).
- VHM 144 cylinder head
- V Force reed valve assemblies
- HPI programmable ignition units
YZ144 is now available in limited numbers via the Yamaha dealer
network priced $9599 RRP inc GST.
Sean Goldhawk,
Yamaha Motor Australia,
489-493 Victoria Street, Wetherill Park, NSW 2164
Office: (02) 9757 0068 Mob: 0438 423844 Fax: (02) 9757 1384