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From: R. LaCasse on 17 Jul 2009 19:48
On Fri, 10 Jul 2009 02:46:48 GMT, paul c <toledobythesea(a)oohay.ac> wrote:

|>paul c wrote:
|>...
|>> Well, I'd say Vito is right - the later CB750's, such as the 1982
|>> models, had twin cams and wasted spark. Any engine that doesn't have a
|>> distributor driven off the camshaft or equivalent electronics wastes a
|>> spark on the exhaust stroke, ...
|>
|>(talking about 4-stroke engines, not 2-strokes.)

I still think the Single Cylinder 4 stroke is a strange "illogical"
idea, but still works fine for the last 25 years....all it needs is a
heavier crankshaft counterweight/throw.

I can surmise that the sale of a "scooter" (Single Cylinder 4
stroke) engine for running generators, pumps, and whatever, is the backbone
of the ongoing M/Cycle/Scooter technology. Ppl wanted a simple engine
without the tranny to run various other applications.
From: someone on 18 Jul 2009 11:29
X-No-Archive: yes
In article <v62265pb6dhbf09jq8sr6ai0m9qep71k02(a)4ax.com>, NG <vampire(a)istar.ca> wrote:
>On Fri, 10 Jul 2009 07:41:15 -0400, "Vito" <vito(a)cfl.rr.com> wrote:
>
>|>> valve job instead of simply rectifying the cdi/regulator of a single
>|>> fire...
>|>
>|>Your statement is still unclear. I've owned half a dozen Brit twins, 10
>|>Harleys, 8 airhead BMWs and god knows how many Jap multi's that "wasted"
>|>sparks and not one ever needed a valve job because of it - nor have I ever
>|>heard of one that did. The extra spark happens when the effected cylinder
>|>is incapable of firing. The one exception is a Harley with its narrow V.
>|>If the engine is turning over slow enough, like when a weak battery or
>|>person is trying to start it, the extra spark *may* cause the motor to "kick
>|>back". But burn a valve? Never.
>
> That's right, I guess my "statement" was a bit unclear, although old
>Harleys still fire both plugs at once, and when your valves wear out, this
>causes backfiring, choking and sputtering.
>
>|>>
>|>> Or do you mean, you have 2 spark plugs per cylinder. which is about
>|>> as good an idea as the 4 valve cylinder...
>|>>
>|>No. 4+ valve cylinders are needed to get the most power out of a given
>|>displacement - like in a racing class. Otherwise cubic inches are cheaper.
>
> Your right, cubes are cheaper than xtra valves....

like harley's old motto. there's no substitute for the stupid impressed by
size, er i mean cubic inches.
From: someone on 18 Jul 2009 11:31
X-No-Archive: yes
In article <75326554kcpnmvi9mhg7rs3bfgjo7eull9(a)4ax.com>, NG <vampire(a)istar.ca> wrote:
>On Fri, 10 Jul 2009 02:46:48 GMT, paul c <toledobythesea(a)oohay.ac> wrote:
>
>|>paul c wrote:
>|>...
>|>> Well, I'd say Vito is right - the later CB750's, such as the 1982
>|>> models, had twin cams and wasted spark. Any engine that doesn't have a
>|>> distributor driven off the camshaft or equivalent electronics wastes a
>|>> spark on the exhaust stroke, ...
>|>
>|>(talking about 4-stroke engines, not 2-strokes.)
>
> I still think the Single Cylinder 4 stroke is a strange "illogical"
>idea, but still works fine for the last 25 years....all it needs is a
>heavier crankshaft counterweight/throw.
>
> I can surmise that the sale of a "scooter" (Single Cylinder 4
>stroke) engine for running generators, pumps, and whatever, is the backbone
>of the ongoing M/Cycle/Scooter technology. Ppl wanted a simple engine
>without the tranny to run various other applications.

try the last century. first bike was a one lunger. i have a 48 comet and a 53
goldie, plus 3 sr's. they all work just fine.
From: SoCalMike on 4 Aug 2009 20:32
R. LaCasse wrote:
> On Fri, 10 Jul 2009 02:46:48 GMT, paul c <toledobythesea(a)oohay.ac> wrote:
>
> |>paul c wrote:
> |>...
> |>> Well, I'd say Vito is right - the later CB750's, such as the 1982
> |>> models, had twin cams and wasted spark. Any engine that doesn't have a
> |>> distributor driven off the camshaft or equivalent electronics wastes a
> |>> spark on the exhaust stroke, ...
> |>
> |>(talking about 4-stroke engines, not 2-strokes.)
>
> I still think the Single Cylinder 4 stroke is a strange "illogical"
> idea, but still works fine for the last 25 years....all it needs is a
> heavier crankshaft counterweight/throw.
>
> I can surmise that the sale of a "scooter" (Single Cylinder 4
> stroke) engine for running generators, pumps, and whatever, is the backbone
> of the ongoing M/Cycle/Scooter technology. Ppl wanted a simple engine
> without the tranny to run various other applications.


youre thinking of a lawnmower or rototiller engine, like the horizontal
briggs or tecumseh engines. they were used in minibikes and go-carts,
but not very (if at all) popular in "Scooters"
From: SoCalMike on 4 Aug 2009 20:35
Bob Myers wrote:
> Vito wrote:
>> <someone(a)some.domain> wrote
>>> give me a 300lb bike with 35hp and good brakes!
>>>
>> Why would you choose some underpowered overweight bike like that? Jeeze,
>> SWMBO's old 125cc Hondas and Yamahas made more power and only
>> weighed half as much. A good 250 makes 80 hp and weighs well under
>> 200 pounds.
>> Oh, you want a street bike that lets you *imagine* you are a racer
>> instead of the real thing? Forget it! Go buy a Harley and quit
>> pretending that you and your bike are something they are not.
>
> Right, like all of the dentists and accountants who buy their
> Harleys, dress up in black leather, and get "badass" tattoos.
> THEY'RE not pretending to be something they're not, no way,
> right? ;-)
>
> Me, I just want a street bike that will let me ride for hours on
> end without worrying about killing my back OR dragging the
> pegs, carries enough gear for weekend touring, and will give me
> the requisite number of smiles in the twisties. Any decent standard
> bike will do that...and "imagining I'm a racer" has nothing to do with it.
>
> Bob M.
>
>
my yamaha TMax does all that, PLUS its insured as a "scooter", which
means lower rates and little to no chance of being stolen for parts,
like a sportbike or a harley.
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