Fuel Switch on CBR600F2

[carl...@my-deja.com]

I recently purchased a '91 Honda CBR600F2. There are no labels on the
fuel switch. Which way is Primary/Reserve/Off?

Is it:

Primary
+
|
Off +--+
|
+
Reserve

or

Reserve
+
|
Off +--+
|
+
Primary

or one of the other combinations?

Thanks in advance.

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[binky_t...@my-deja.com]

Your second guess was correct, R-up, P-down.

Regards

--
Binky the Biker
Honda CBR600 '96
Yamaha SRX-6 '89
Honda TL125s '76

[ols...@my-deja.com]

In article <7mnc4m$f75$1...@nnrp1.deja.com>,

Mark.Ca...@umn.edu wrote:
> I recently purchased a '91 Honda CBR600F2. There are no labels on
> the fuel switch. Which way is Primary/Reserve/Off?
>
> Is it:
>
> Primary
> +
> |
> Off +--+
> |
> +
> Reserve
>
> or
>
> Reserve
> +
> |
> Off +--+
> |
> +
> Primary
>
> or one of the other combinations?
>

You should be very careful not to confuse 'Primary' with 'Prime'.
I much prefer using the term 'Main' to refer to the non-reserve
tank petcock setting.

I don't know if this bike has such a setting, but many vacuum
operated petcocks have three settings: ON, PRI(me), and RES(erve).
The PRI(me) position allows fuel to flow when the engine is not
producing any manifold vacuum, which lets you refill the carb bowls
after running out of gas or draining them for storage. If there
is no PRI(me) position then you either have to crank the engine
for an excessively long time to build up enough vacuum to turn the
petcock on, or attach a vacuum pump to the petcock. Some bikes
MAY bypass the vacuum operated valve in the RES(erve) position
if they don't have a PRI(me) position.

PRIME should ONLY be used for priming- not for normal running. If
you park the bike with the petcock left in PRIME, you are risking
severe engine damage. This can happen if one of the float needles
allows gas to leak into the cylinder. When you start the bike with
a cylinder full of incompressible gasoline, you can bend pushrods.
Or the gas may simply drain down into the crankcase and dilute the
oil, leading to bearing failure.

My '81 CB900C has an unusual setup- the petcock is a normal
ON-OFF-RESERVE type, with a vacuum operated shutoff valve that
is separate from the petcock. This means if the carbs are drained
dry the best way to fill the bowls is by using a vacuum pump hooked
up to the valve, otherwise it takes a LONG time to build up enough
vacuum from cranking to get it to start, if the battery is low,
forget it. It is also not nice for the starter.

Cheers,
Mark
--
'81 CB900C

[carl...@my-deja.com]

Thanks, that's good info.

According to 'Binky the Biker' the settings are:

Reserve
+
|
Off +--+
|
+
Primary

The fuel switch only has the above 3 settings. It cannot be turned to
the 3 o'clock (90 deg.) position. I'm assuming that the 3 available
positions are Reserve, Off, and Primary (a.k.a., Main, On, etc.).

Any reason I should believe otherwise? Can anyone confirm that the '91
CBR600F2 does or does not have vacuum operated petcocks?

[edcbr9rr]

an easy way to remember...just think...you are UP a shit creek if you dont
find a gas station in the next xx miles
UP = reserve

binky_t...@my-deja.com wrote in message
<7mncdp$fbc$1...@nnrp1.deja.com>...

>Your second guess was correct, R-up, P-down.
>
>Regards
>
>--
>Binky the Biker
>Honda CBR600 '96
>Yamaha SRX-6 '89
>Honda TL125s '76
>
>

[Brian Handlon]

Yes it has vacuum operated petcocks? To drain the tank you have to take
the petcock off.

Just a side note. The F1's do not have the same petcock switch postion.
If i remember correctly they the main and reserve are inverted.

[carl...@my-deja.com]

In article <378F449A...@eos.ncsu.edu>,

Brian Handlon <beha...@eos.ncsu.edu> wrote:
> Yes it has vacuum operated petcocks? To drain the tank
> you have to take the petcock off.

Thanks, Brian.

Let me summarize for review what I've heard here:

The '91 CBR600F2 fuel switch has the following settings:

Reserve
+
|
Off +--+
|
+
Primary

The fuel switch only has the above 3 settings. It cannot be turned to
the 3 o'clock (90 deg.) position.

The CBR600F2 has vacuum operated petcocks, but there is no "Prime"
setting to allow fuel to flow when the engine is not producing any
manifold vacuum. So, leaving the switch in any of these settings
should not allow fuel to flow when the engine is not running.

Do I have this right? Other comments?

[JLQ]

Yes, on my 88 F1 it is:

ON
\
OFF
/
RESERVE

Brian Handlon wrote:

> Yes it has vacuum operated petcocks? To drain the tank you have to take
> the petcock off.
>