Re: jeremy's gotta point ...
- artdog1512 wrote:
> > Subject: Re: too heavy ...*Just for fun, check this out;- Honda have released a new model 250
four stroke crosser in the UK.
The entire bike costs less than many Rotaxes for our use; you could
run it in on the bike, wash off the mud, then haul out the motor for
your ultralight. Knowing Honda it will be reliable, although I'd hope
for a decompressor for hand-pull starting!
Engine Type Liquid-cooled 4-stroke 4-valve SOHC single
Engine Displacement 249.4cc
Bore & Stroke 78 x 52.2mm
Compression Ratio 12.9 : 1
Carburation 37mm Keihin FCR flat slide carburettor with throttle
Max. Power Output 42 bhp at 11,000 rpm
Max. Torque 28.5Nm at 8,000 rpm
Ignition Computer-controlled digital capacitor discharge with
Starter Primary kick (Damn!)
*Out of interest I don't know what the final reduction ratio is
through the sprockets, assuming the rear wheel maxes out at 1500 rpm,
the gearbox sprocket must be doing at least 7,500? Maybe a case of
picking a gear that suits your favourite redrive, then sticking the
gear selector lever in your toolbox....
At those revs the power pulses from a four stroke single would be so
close together as to be smooth from the props' point of view.
Incidentally, I thought it was a two - stroke at first because the
bulk of the exhaust is right up close to the engine, so rigging it in
say, a trike wouldnt be too much hassle.
Always thought that Motocross bikes have the closest in requirement
to us flyers, light weight, tough and powerful units in a compact
package, so keep a watchful eye on developments in this particular