CB250RS engine anyone?

Austin Shackles says...

I never saw the point in that, there's no benefit whatsoever.

 

If you are going to let an engine fitted with very strong valve springs idle
you have got to be very sure of the surface hardness of the cam noses and
the tappet faces. The stress on these (which in theory is infinite as there
is only line contact) is considerably reduced once you have a few thousand
revs on board.

Ron Robinson

 

R.N. Robinson says...

The answer to this is to make the camshafts and tappet faces properly in
the first place, which is something the Japanese managed quite nicely.

 

It's to do with the machine not motoring off on its own, also if it lands on
its side it can self-destruct the engine if it's still running.

 

Do post at the bottom, thanks.

 

Especially if it's a sidecar, eh, Sweller....

 

The Amal racing carb cut out idling jets to avoid obstructions
in the air stream. There was also the benefit that if you came
off the engine would stop.

Ken Young

 

Most Royal Enfields for a start.

Ken Young

 

I have a feeling that may be the difference between direct and
indirect boxes.

Ken Young

 

Well, I've had the odd neutral prob with a Japanese bike but it's
usually simply down to a worn clutch causing drag.

Thinking about European bikes I've owned, I don't recall problems with
my K100 or the <cough> CZ; the Guzzi simply needs careful footwork to
find neutral; the Aprilia is a bit of a bugger but I'm fairly sure
that's down to the clutch dragging. Trouble is, it's a hydraulic
clutch, so there's not much I can do to adjust it without major
modification.
..

 

The See Bee 250 is dreadful (well, it was a few years back when I rode
one for a couple of days) for getting into neutral. Just like my old
B40.

 

Mike Fleming says...

My CB250RS was a wonderful little thing, even with well over 150,000
miles under its wheels.

 

This was the one Honda brought out in the mid-90s. I didn't have that
problem with the Dream, the Superdream, or the CX500 (which seemed to
use the same gearbox).

 

My B40 did too. Admittedly it was actually supposed to be finding
gears (the only time it was reluctant to find neutral was when I
wanted it).