Suzuki GS400
Good 'un turns
bad
A very hot June weekend, bikes whizzing past me in the car. I
began plotting. Later, a glance in the local free paper revealed
a couple of MZ's and a seventies Suzuki GS400. After a bit of
thought I recalled that it was a vertical twin, generally well
thought of, but nothing exceptional. At 400 quid, worth a phone
call. Only two owners but 48000 miles and in need of an MOT. Needed
silencers, tyres and front brake pads.
Went to have a look. Engine dribbled a bit of oil through the
cylinder head gasket but wasn't noisy. The suspension was OE,
worn out, but the frame seemed straight and it went where it was
pointed. After the cage, seemed damn quick, too. Alright, I'll
have it.
I hadn't realised how expensive parts for motorcycles had become.
Bloody robbers! The breaker saved the day, sold me half worn tyres,
pads and a set of silencers that looked like they might fit. Next
day the local, back lane, MOT tester had a look at the bike and
gave me a ticket. He muttered something about the chassis bearings
but he was always a bit of a moaner.
Back on the road, the GS galloped along rather spiritedly, gave
my reactions a good going over. Took a couple of days to get used
to. Never had any idea of what the tyres were doing, the rider
left remote from the tarmac. The engine was worn enough that its
balancer didn't completely remove all sensation of gas being turned
into motive force, but the vibes that got through were irritating
rather than the stuff of character.
There were lots of minor hassles to sort out. Cables that snapped,
wiring that fell apart, the fuel line started leaking then the
floats went awry, and the brake nipples broke off... The whole
bike gave the impression that it was getting on a bit, rot setting
in as a prelude to total failure.
The best part of the GS was the motor. Not that it was full of
character, exactly, but it still delivered most of its original
36 horses and would push the bike along at 85-90mph with hardly
any effort. A couple of times I pushed the bike past the ton,
no great trauma just that the vibes became a bit frenzied - new
bikes were much smoother.
Handling was a bit dodgy from the dead suspension but it could
still be hurled around when the occasion rose... I was following
this Volvo hearse, which was meandering along at about 20mph,
veering to the left slightly every time a turn-off came up. He
finally found the turn he wanted, left indicator on. I played
games on the clutch and throttle, started to accelerate past when
I saw the guy wrench the wheel towards the right!
Apart from a parking space, there wasn't anywhere for him to go.
I lurched the GS across on to the wrong side of the road, whilst
swearing my head off at him. He braked, allowing me to get past
with an inch to spare! In the mirror, I then saw him swing back
to the left and finally make his turn. Either a complete idiot
or a homicidal maniac.
It was one of those streets with large signs for speed cameras
and my 45mph excursion on to the wrong side of the road, if snapped,
would've got me a ban. In the cage, I usually meandered along
on the speed limit without much thought or worry. On a bike, these
limits were pretty absurd as there were always stretches of tarmac
where I could bowl along at 40-50mph in perfect safety. It almost
makes owning a bike pointless...
Except in heavy traffic, the GS narrow and fluid enough to run
through the cages without much effort. Fuel was 55mpg, so both
money and time were saved on the 11 mile run to work each day.
Not that it was the point of the bike, I bought it for kicks rather
than practicality but it does show that even an old hack can offer
plenty of savings.
Until it goes wrong. In the GS's case, the first hint was an increase
in the amount of oil seeping out of the cylinder head gasket.
I didn't do anything, other than add oil, for a few weeks - it
was still working, leave well alone. Eventually, I decided to
tighten down the cylinder head bolts. Easier said than done as
the fuel pipe didn't want to come off the petrol tank. I actually
had to hacksaw the pipe in half and then work the halves off the
carbs and tank once the latter was removed.
Annoyed by this additional hassle I probably put a bit too much
effort into tightening down the head. A stripped thread was my
reward! The air was blue with my curses. I could take an hint,
engine out, head off and cylinder removed - only the cylinder
didn't want to come out of the crankcase, did it? After five minutes
thought a large hammer was taken to it; a couple of broken fins
later, all was revealed...
And it wasn't a pretty sight! The pistons and bores were heavily
scored, a slight amount of movement in the small-ends, whilst
there were a couple of lumps missing out of the camshafts. The
gaskets were destroyed in disassembling the motor. Ever the optimist,
the ruined thread was repaired with Araldite and the whole lot
reassembled with Hermatite replacing the gaskets. At least it
stopped the oil leaks but the engine was an order of magnitude
louder in its rattles and knocks.
Generally, once a Jap engine has been stripped down it never runs
too well. The GS was no exception. Top speed was now 85mph and
fuel 45mpg, whilst vibes had increased in intensity. It still
motored along quite happily but I had reservations about doing
any great distances.
When the chance of a used GS400 motor came up I handed over a
hundred notes, sight unseen. The motor didn't look too promising,
all furred alloy, but I knocked it in and spent half a day getting
it to fire up. Smoked like an MZ! The next day I took the motor
down, found that the oil rings weren't really oil rings! A new
set of oil rings, a bit of care in the rebuild and I had a good
running motor. Well, 95mph and 50mpg. Decided to rebuild the original
motor as and when the parts turned up on the secondhand circuit.
Worth the effort? Well, we're talking cheap motorcycling here
- if the worst came to the worst I could always shoehorn a totally
different motor into the chassis. The latter has lately benefited
from a secondhand pair of Girlings and stiffer fork springs -
handles really well now! In some ways, it's infinitely rebuildable,
or at least easily bodged, The total cost is equivalent to a year's
running costs for your average replica and with all the speed
limits and plod madness I reckon I get where I'm going just as
quickly and have loads of fun along the way.
I don't even mind the winters, on a reasonable set of Avons the
GS ain't half bad and there's little to damage (other than myself)
when she slides down the road - it's all pretty far gone already!
It's quite likely that the car will be sold soon and I will get
very serious about motorcycling again.
Terry Williams