light at 2761b, fast at around
90mph (which is more than some of the singles twice the size can
realistically manage), the slim and nimble RS became the dispatch rider's
delight Even after the 125cc learner laws knocked the stuffing out of 250
sales, the RS continued to sell well
It brakes superbly, returns
around 60m pg and seems to respond well to being thrashed to within an inch
of its bottom end. Maintenance is usually minimal if there is any at all,
but with ignition that never needs touching, an automatic camchain adjuster
and valves that keep to themselves you can simply get on and ride it hard.
In keeping with its restrained
looks, with an absence of twidly bits, the suspension can only be adjusted
for preload on the rear two shocks, but handling is none the less pin-sharp.
Naturally it is not a favourite
for intercontinental cruising, although it has been done, but is instead a
hot-shot for town riders and roundabout specialists. It's about as close as
Honda have got to a four-stroke LC.
Models and Years
the CB250RSA that came out in
1980 was apparently a new bike, but its pedigree goes back further. The
XL250S of the late 70s was itself
based on the earlier XL250, but
had CDI ignition, twin exhaust ports, a balance shaft and more power and
torque as well as the original four valves and 74mm x 57.8mm bore and
The CB250RS had all this plus a
black paint job, bigger accelerator - pumped carb, bigger valves and ports,
higher compression ratio and a claimed 26bhp at 8500rpm.
Everything was restrained, with
only black, red or a metallic blue to choose from and very few stripes.
It ran virtually unchanged until
the CBX250RS of 1984, which had the twin cams and radial head, although a DX
(De Luxe) edition came out in '83 with electric start a lockable seat hump
and O-ring chain. The DX cost £150 more than the RS, at around £800 but
didn't sell so well -its garish pinstriping also counted against it
The CBX250RS was even more of a
flop since you could still buy RSs at the same time for much less money. The
RS was, and is, the one to have.
Faults aid Quirks
As you have read, the RS thrives
on heartless owners, but don't take it for granted if you are buying one.
The two areas to watch are the
oil and the chain. Four-stroke singles tend to be hard on transmissions due
to their uneven torque delivery, and Honda haven't really helped. The
original chain is only % x Win and the rear hub shock absorber basically
To make matters worse the front sprocket has only 14 teeth due to
rapidly spinning gearboxes so chain wear is a major problem.
It may only be a 250cc, but it
will eat a chain every 6-8000 miles even if you look after and use
top-quality chains and lube.
You will have to replace chain
and both sprockets often and lube them maybe every day. You can get a % x
%in conversion, but there is no room for an O-ring version.
Look at the oil level as often as
you look at the chain and alt should be well. The engines only hold 1.7
of oil and filtering is minimal so change the oil every 1000 miles if
you don't want the camshaft and head to become one piece. Use top-quality
oil, and top it up if necessary between changes — it will be necessary if
you ride them hard, which appears to be the only way they get ridden.
like most Hondas the front brake
needs regular maintenance in the winter to avoid seized pistons, and the
choke cable also tends to seize
listen for the balancer shaft
chain, since if it is slack will make the bike vibrate badly. It is under
the right-hand engine cover, but approach with caution since you can damage
a lug belonging to the automatic decompressor.
Finally, check for loose spokes,
since people tend to forget that they need maintenance like everything else.