Further to t'other thread, progress is being made...
Engine now turns over quite spritely but won't fire. I have a spark,
albeit not the strongest ever seen, but definitely a regular spark.
Disconnected the fuel at the carb and it's delivering plenty when
turned over.
But no hint of firing. Even after 30-60 seconds cranking the plugs
are bone dry - shouldn't they be showing evidence of petrol? If so,
why wouldn't fuel be getting there?
In news:dnp461lloaksf6thur56vspv2a3bqmcklo@4ax.com,
Tim Hobbs <tim@101ambulance-urine.net> blithered:
> Further to t'other thread, progress is being made...
>
> Engine now turns over quite spritely but won't fire. I have a spark,
> albeit not the strongest ever seen, but definitely a regular spark.
>
> Disconnected the fuel at the carb and it's delivering plenty when
> turned over.
>
> But no hint of firing. Even after 30-60 seconds cranking the plugs
> are bone dry - shouldn't they be showing evidence of petrol? If so,
> why wouldn't fuel be getting there?
Float chamber empty? needle valve/float stuck? Jets clouted up with detritous?
--
"She who says it cannot be done should not interrupt him doing it."
If at first you don't succeed,
maybe skydiving's not for you!
On Sun, 17 Apr 2005 15:40:22 +0100, "GbH"
<Geoff_Hannington@IEE.ORGasm> wrote:
>In news:dnp461lloaksf6thur56vspv2a3bqmcklo@4ax.com,
>Tim Hobbs <tim@101ambulance-urine.net> blithered:
>> Further to t'other thread, progress is being made...
>>
>> Engine now turns over quite spritely but won't fire. I have a spark,
>> albeit not the strongest ever seen, but definitely a regular spark.
>>
>> Disconnected the fuel at the carb and it's delivering plenty when
>> turned over.
>>
>> But no hint of firing. Even after 30-60 seconds cranking the plugs
>> are bone dry - shouldn't they be showing evidence of petrol? If so,
>> why wouldn't fuel be getting there?
>
>Float chamber empty? needle valve/float stuck? Jets clouted up with detritous?
As I thought... I need to learn about how carbs work. Bugger....
On or around Sun, 17 Apr 2005 15:40:22 +0100, "GbH"
<Geoff_Hannington@IEE.ORGasm> enlightened us thusly:
>In news:dnp461lloaksf6thur56vspv2a3bqmcklo@4ax.com,
>Tim Hobbs <tim@101ambulance-urine.net> blithered:
>> Further to t'other thread, progress is being made...
>>
>> Engine now turns over quite spritely but won't fire. I have a spark,
>> albeit not the strongest ever seen, but definitely a regular spark.
>>
>> Disconnected the fuel at the carb and it's delivering plenty when
>> turned over.
>>
>> But no hint of firing. Even after 30-60 seconds cranking the plugs
>> are bone dry - shouldn't they be showing evidence of petrol? If so,
>> why wouldn't fuel be getting there?
>
>Float chamber empty? needle valve/float stuck? Jets clouted up with detritous?
one of they. either the petrol in the carb has evaporated leaving spooge,
or the float valve stuck shut is my bet. Try a bit of percussive
maintenance.
--
Austin Shackles. www.ddol-las.fsnet.co.uk my opinions are just that
Once, when the secrets of science were the jealously guarded property of
a small priesthood, the common man had no hope of mastering their arcane
complexities. Years of study in musty classrooms were prerequisite to
obtaining even a dim, incoherent knowledge of science.
Today, all that has changed: a dim, incoherent knowledge of science is
available to anyone. - Tom Weller, Science Made Stupid, 1986
"Austin Shackles" <austinNOSPAM@ddol-las.net> wrote in message
news:but461tse7r74hq56jtaqdmv2tbdmcirph@4ax.com...
>
> one of they. either the petrol in the carb has evaporated leaving spooge,
> or the float valve stuck shut is my bet. Try a bit of percussive
> maintenance.
Yup ,, tap the handle of a screwdriver on the top of the float chamber lid a
couple of times. Usually enough to free a sticking float.
Also try a squirt of fuel / wd40 directly down the inlet... if she splutters
on the fuel provided at least you can eliminate everything else.
>On or around Sun, 17 Apr 2005 15:40:22 +0100, "GbH"
><Geoff_Hannington@IEE.ORGasm> enlightened us thusly:
>
>>In news:dnp461lloaksf6thur56vspv2a3bqmcklo@4ax.com,
>>Tim Hobbs <tim@101ambulance-urine.net> blithered:
>>> Further to t'other thread, progress is being made...
>>>
>>> Engine now turns over quite spritely but won't fire. I have a spark,
>>> albeit not the strongest ever seen, but definitely a regular spark.
>>>
>>> Disconnected the fuel at the carb and it's delivering plenty when
>>> turned over.
>>>
>>> But no hint of firing. Even after 30-60 seconds cranking the plugs
>>> are bone dry - shouldn't they be showing evidence of petrol? If so,
>>> why wouldn't fuel be getting there?
>>
>>Float chamber empty? needle valve/float stuck? Jets clouted up with detritous?
>
>one of they. either the petrol in the carb has evaporated leaving spooge,
>or the float valve stuck shut is my bet. Try a bit of percussive
>maintenance.
Go basically pour some petrol into the carb and give it a slap?
Tim Hobbs wrote:
> Further to t'other thread, progress is being made...
>
> Engine now turns over quite spritely but won't fire. I have a spark,
> albeit not the strongest ever seen, but definitely a regular spark.
>
> Disconnected the fuel at the carb and it's delivering plenty when
> turned over.
>
> But no hint of firing. Even after 30-60 seconds cranking the plugs
> are bone dry - shouldn't they be showing evidence of petrol? If so,
> why wouldn't fuel be getting there?
>>>>
>>>> But no hint of firing. Even after 30-60 seconds cranking the plugs
>>>> are bone dry - shouldn't they be showing evidence of petrol? If so,
>>>> why wouldn't fuel be getting there?
>>>
>>>Float chamber empty? needle valve/float stuck? Jets clouted up with detritous?
>>
>>one of they. either the petrol in the carb has evaporated leaving spooge,
>>or the float valve stuck shut is my bet. Try a bit of percussive
>>maintenance.
>
>Go basically pour some petrol into the carb and give it a slap?
>
>Sounds within my skill set....
OK - tipped about half a pint of fuel down the carb. Much gurgling, so
it went somewhere. Left it a few minutes (pudding was ready!) and
then turned it over - lots of coughing and half-running, then the fuel
ran out and it stopped again.
On Sun, 17 Apr 2005 20:52:58 +0100, Tim Hobbs
<tim@101ambulance-urine.net> wrote:
>
>OK - tipped about half a pint of fuel down the carb. Much gurgling, so
>it went somewhere. Left it a few minutes (pudding was ready!) and
>then turned it over - lots of coughing and half-running, then the fuel
>ran out and it stopped again.
You really need to meter the stuff into the carb as you are cranking
if you are trying to prove that it is a fuel feed fault, with one
person dripping it in you can adjust the mixture on the throttle.
Over do it and you need to dry the plugs off.
Once it's basically turning over under its own steam rapidly opening
the throttle should pump fuel from the richening pump (depending on
model and I stopped using a sIII 10 years ago) if there is fuel in the
float chamber, if you can keep it alive like this then it points to
blocked jets, if the throttle pump doesn't squirt fuel when its
depressed it points to a blocked float valve (assuming the fuel pump
on the side of the block gets fuel up to the carb.
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