Posted by BrianNZ on June 15, 2010, 7:39 pm
tomorrow@erols.com wrote:
>> tomor...@erols.com wrote:
>>> On Jun 14, 2:06 am, totallydeadmail...@yahoo.co.uk (The Older
>>> Gentleman) wrote:
>>>>> My boys Yamaha SRX 250 has been dripping fuel for a few weeks. Sick of
>>>>> the smell, I'm taking the carbs off to check if the float is
>>>>> stuck/stuffed. My first stumbling block was getting the tank off. The
>>>>> fuel switch has a 'prime','on','res' 3-way lever.....but none of those
>>>>> positions turns the fuel 'off'! I had to drain the tank.
>>>>> Should this happen or is the 3-way fuel switch stuffed?
>>>> It's a vacuum tap, so shouldn't flow fuel with the tap in the 'on'
>>>> position unless the engine is running. So, yes, it's borked.
>>>> This would also suggest that the reserve position is now superfluous.
>>> I don't think so, since regaredless of whether the vacuun-actuated
>>> functionality has been lost, the standpipe for the ON position is
>>> still physically higher than the RESERVE standpipe, so fuel flow -
>>> regardless of the presence or absence of vacuum - will stop when the
>>> fuel level falls below the standpipe for the ON position.
>>> What no one has pointed out (that I have seen) is that even if the
>>> vacuun-actuated functionality has been lost (as is certainly appears
>>> to have been, given the description) the bike should still not LEAK
>>> fuel unless the float valve(s) or valve seat(s) is(are) bad.
>>> There are at least two different problems here that need to be
>>> solved. The petcock probably needs a rebuild, and the carb float
>>> valve(s) need(s) looking at.
>> It always starts out as 'one' problem and grows from there. :) I'll be
>> ignoring the petcock for now and concentrate on the carb......once I get
>> the bloody car sorted!! Still, a good excuse to get away from work
>> (computers) for a day and have a play in the workshop. Whats the worst
>> that can happen........
>
> For the answer to that question, we turn you over now to Datesfat....
LOL....I have moved the fire extinguisher closer to the workbench! The
car is just about sorted. The steering rack boots needed replacing, no
biggie, but of course now thats almost finished I can't find my split
pin collection....and I've dismantled the car in the driveway (sunny
day) so I can't take the bike to get the bits I need. Doh! I've been
away from the mechanicing game for to long. I never used to pull
anything apart till I had all I needed at hand.
Posted by Beav on June 14, 2010, 12:00 pm
> My boys Yamaha SRX 250 has been dripping fuel for a few weeks. Sick of the
> smell, I'm taking the carbs off to check if the float is stuck/stuffed. My
> first stumbling block was getting the tank off. The fuel switch has a
> 'prime','on','res' 3-way lever.....but none of those positions turns the
> fuel 'off'! I had to drain the tank.
> Should this happen or is the 3-way fuel switch stuffed?
I'd have clamped off the pipe going to the carb(s) with a pair of Molegrips
and sorted the possibility that the petcock has an "off" position once the
thing was more accessible.
--
Beav
Posted by BrianNZ on June 15, 2010, 6:01 pm
Beav wrote:
>
>
>> My boys Yamaha SRX 250 has been dripping fuel for a few weeks. Sick of
>> the smell, I'm taking the carbs off to check if the float is
>> stuck/stuffed. My first stumbling block was getting the tank off. The
>> fuel switch has a 'prime','on','res' 3-way lever.....but none of those
>> positions turns the fuel 'off'! I had to drain the tank.
>>
>> Should this happen or is the 3-way fuel switch stuffed?
>
> I'd have clamped off the pipe going to the carb(s) with a pair of
> Molegrips and sorted the possibility that the petcock has an "off"
> position once the thing was more accessible.
>
So would I.....next time. :) I was under the delusion that at least one
of the settings would have stopped the flow.
Posted by Vito on June 16, 2010, 7:25 am
BrianNZ wrote:
>> So would I.....next time. :) I was under the delusion that at least
>> one of the settings would have stopped the flow.
Don't feel bad. The first valve like that I ever saw was on an 1100 Suzi.
Expecting "off-on-res" I found "pri-on-res" and ass-umed that "pri" meant
"primary" ..... until I rode the 600# beast to reserve and ended up pushing
it a mile. But that's not as bad as the scooter a friend bought. His carb
dries out if it's not ridden daily then the battery cannot generate enough
vacuum to turn the automatic valve on. Ain't all these improvements grand?
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>>> On Jun 14, 2:06 am, totallydeadmail...@yahoo.co.uk (The Older
>>> Gentleman) wrote:
>>>>> My boys Yamaha SRX 250 has been dripping fuel for a few weeks. Sick of
>>>>> the smell, I'm taking the carbs off to check if the float is
>>>>> stuck/stuffed. My first stumbling block was getting the tank off. The
>>>>> fuel switch has a 'prime','on','res' 3-way lever.....but none of those
>>>>> positions turns the fuel 'off'! I had to drain the tank.
>>>>> Should this happen or is the 3-way fuel switch stuffed?
>>>> It's a vacuum tap, so shouldn't flow fuel with the tap in the 'on'
>>>> position unless the engine is running. So, yes, it's borked.
>>>> This would also suggest that the reserve position is now superfluous.
>>> I don't think so, since regaredless of whether the vacuun-actuated
>>> functionality has been lost, the standpipe for the ON position is
>>> still physically higher than the RESERVE standpipe, so fuel flow -
>>> regardless of the presence or absence of vacuum - will stop when the
>>> fuel level falls below the standpipe for the ON position.
>>> What no one has pointed out (that I have seen) is that even if the
>>> vacuun-actuated functionality has been lost (as is certainly appears
>>> to have been, given the description) the bike should still not LEAK
>>> fuel unless the float valve(s) or valve seat(s) is(are) bad.
>>> There are at least two different problems here that need to be
>>> solved. The petcock probably needs a rebuild, and the carb float
>>> valve(s) need(s) looking at.
>> It always starts out as 'one' problem and grows from there. :) I'll be
>> ignoring the petcock for now and concentrate on the carb......once I get
>> the bloody car sorted!! Still, a good excuse to get away from work
>> (computers) for a day and have a play in the workshop. Whats the worst
>> that can happen........
>
> For the answer to that question, we turn you over now to Datesfat....