Why is there 1 carb per cylinder when a car has one carb for multiple cylinders?

Yes, you're right. It went XS650, and then TX500/XS500 more or less
simultaneously with the TX750 (which we never got in the UK). The XT500
definitely pre-dated the XS750 triple, though.

 

Yes, you're right. It went XS650, and then TX500/XS500 more or less
simultaneously with the TX750 (which we never got in the UK). The XT500
definitely pre-dated the XS750 triple, though.[/QUOTE]

Yeah, but only by a year, and it's therefore quite possible that the
motor itself was developed earlier.
--
_______
..'_/_|_\_'. Ace (brucedotrogers a.t rochedotcom)
\`\ | /`/ GSX-R1000K3
`\\ | //' BOTAFOT#3, SbS#2, UKRMMA#13, DFV#8, SKA#2, IBB#10
`\|/`
`

 

I'm fairly certain the Suzuki 600 motor (Freewind?) used on the bigger CCMs
has 2 carbs, too

 

You lucky bastard.

 

Istr some single having a tiny bore primary carb and a fairly normal
bore main carb; it making it easier to attend to the different fuelling
demands in the rev range. Not a new idea - various progressive twinchoke
carbs had been around on car engines for ages before that.

 

Yeah, but only by a year, and it's therefore quite possible that the
motor itself was developed earlier.[/QUOTE]


Yamaha started work on the XT in 1973 and its designer then went onto
the XS750, so the triple definitely followed the single. The XT was
shown in Japan in 1975 and the XS750 in 1976. Interestingly, work
started on the 750 in 1973 also. The TX750 twin dates from 1972
(according to Yamaha Jap's website)

 

Well the GS850 was discussed recently, but my vote would have to be
with the XS1100.

Of course, that's excluding Hardleys and the like.

--
_______
..'_/_|_\_'. Ace (brucedotrogers a.t rochedotcom)
\`\ | /`/ GSX-R1000K3
`\\ | //' BOTAFOT#3, SbS#2, UKRMMA#13, DFV#8, SKA#2, IBB#10
`\|/`
`

 

Ace said...

VF750S, VF750F, any Cossak or Dnepr, any BMW, anything previously owned
by Timo.

 

Oi! Nowt wrong with them. Lardy tourers of their day, that's all.

, but my vote would have to be

A brute of an engine in a frame that should have had an engine half the
weight and 2/3rds the power. I'd still take one of those engines for
other uses, just not care very much to go motorcycling with one unless
it was in a Bimoto frame.

Offhand, I can't think of a totally *bad* motorcycle; most of them did
the job they were supposed to do in and of their era. Truly, when you
consider the utter shite we used to buy from the British factories,
99.9% of Japanese production is flawless in comparison.

Even the much-reviled FT500 did what it was supposed to do; start, stop,
go from A to B in a thumpery way, just not for very long.

 

GPz305 - a byword for mechanical disaster. But that was still an early
1980s model. Loads of 1980s and 1970s bikes were crap.

Since then...

Quite a few Italian things. Bimota Mantra - the bike with the walnut
dashboard. Lots of early-1990s Cagivas. Who remembers the River? Honda
X-11 comes to mind - the naked Blackbird thingy. Definitely a 21st
century lemon.

 

Pay attention. That's what started this sub-thread.

 

As someone else has said, Honda CB500T. Utterly dreadful bike.

 

Welll, I dunno about Hondas, but I'm fairly sure that Yamaha added the
second carb for tractability reasons - it's notoriously difficult to
make a *performance* big single, especially with light flywheels,
powerful without being snatchy at low revs.

This is also true, and may be an added benefit. It's certainly why
multis use one carb per cylinder. However, Yamaha 660 singles have
five valves - three of which are intakes. I don't *think* they use
three chokes.

 

My bad. I thought you were referring to the tx750, which frequently is described as the xs750.

Although I think to qualify, the bike is required to have no redeeming values. I think the TX takes
the lifetime achievement award for that. The XS750/XS850 may not be desirable, but you can still
find a few running around.

 

Looks like TOG's shopping list from here.

 

You ******.....

 

Weird thing about the middle cylinder - dodgy coil, probably. My XS750
was the F model, to be followed by the 850G. The F had all the bugs
sorted and never gave a minute of trouble. Too late for Yamaha, though;
by that time the triple's rep had been rightly trashed.

Otoh, it meant that you could pick up a nearly new triple for peanuts.

 

Did you ever ride one ? Utterly horrible POS. 'Naked Blackbird' they
said, (as I wheeled it out for a day whilst my 'bird was in for
service). Bollocks is it, it's an underpowered lardy shed.

They should be ashamed of themselves, strangling an engine like that.

Paul.

 

Bear said...

I have to disagree on the GSX v VF comparison. In the mid 80s I owned a
one year old GSX750EFE[1] and an 18 month old VF750F back to back and
the GSX was a far better put together bike. I don't mean just engine-
wise, but the whole bike was much better made. I rode the GSX through
two winters, the VF through one. I probably did twice the mileage on the
GSX than I did on the VF and it still looked good when it was sold. The
VF was in a worse state after one winter than the GSX had been when it
went to a new home, I had to replace the whole VF exhaust system because
it had completely rotted away and there was visible corrosion on the
silver painted frame, the GSX had a few corroded fasteners and that was
about it.

The VF handled marginally better in that it turned in quicker due to a
much shorter wheelbase, but was no faster and the brakes weren't as good
as the Suzukis either. The GSX was lots comfier too. I only replaced the
VF with another one after it was stolen because it had been 100%
reliable even though it suffered badly from daily use. What a mistake
that was as the second one was an utter fucking mechanical disaster
area.

My only real complaint about the GSX was the gearbox, which suffered
from finding false neutrals if you weren't very precise with your toe,
and it ended up losing 2nd gear altogether a couple of months after I
sold it to a mate. In short, I should have bought another one when the
VF got nicked.

[1] The later fully faired model with Full Floater[2] suspension and
TSCC[3] that came just before the GSXRs
[2] We had a few toilet humour related giggles at that one.
[3] Twin Swirl Combustion Chambers, better known round our way as Town
and Suburbs Cowboy Cruiser.

 

Obviously not

Cars? Hmmmmmmm......

(I can see Champ now: "Ooooh! Oooooh! I caught one in my twat net!!!"
[just imagine it like a butterfly net. But for twats.])

Dave