On 04/01/2012 19:39, soup wrote:
Really strange one this but does anyone know anything about small
(3.0cc) "nitro" engines? I cannot get it to start it was running but I
cannot get it to start now. The fuel lines are not blocked (fuel can be
blown through) nothing seems to be blocking the carburettor as I have
taken it to bits and cleaned it. There is also sufficient compression
for the buggy to be lifted by the pull start. Yet I cannot get fuel
through to the cylinder (fuel is not sucked through the carb) even
blocking the exhaust and pulling the starter does not move fuel through
to the cylinder. The R/C chap at the local model shop is not back untill
the 10th. I know of no-one in the immediate area who deals with these
engines and as I am at a loss I thought of here .


Finally sussed . I had driven the needle (highspeed needle) so hard into
the housing that the tip had broken off and blocked the needle housing .
Thing is I hadn't put a lot of force behind it maybe it was a badly
designed/"friday" needle.

I was having trouble starting again so decided I would take the needle
to fully closed then open it to 3 turns.
SPECULATION :-with the cold getting to my hands I had put more force on
the needle than I thought, and snapped the needle.

The snapped end of the needle fully blocking the housing, so now the
engine wouldn't start no matter what I did. Model shop is getting a new
needle valve assembly which they are giving me FOC as there have been a
few of these snapped needles and the assumption seems to be it may be a
badly designed and if they just replace FOC no one will complain
properly, but if it happens again I will be complaining (I am not
complaining at the moment as I am not sure I didn't cause this breakage
myself (I don't think I did but...) ).

On Jan 12, 7:41*pm, soup wrote:

The snapped end of the needle fully blocking the housing, so now the
engine wouldn't start no matter what I did. Model shop is getting a new
needle valve assembly which they are giving me FOC as there have been a
few of these snapped needles and the assumption seems to be it may be a
badly designed and if they just replace FOC no one will complain
properly, but if it happens again I will be complaining (I am not
complaining at the moment as I am not sure I didn't cause this breakage
myself (I don't think I did but...) ).

I suspect the needle was hardened but insufficiently tempered after
thus leaving it glass hard but brittle.

On Jan 12, 7:41*pm, soup wrote:
On 04/01/2012 19:39, soup wrote:

Really strange one this but does anyone know anything about small
(3.0cc) "nitro" engines? I cannot get it to start it was running but I
cannot get it to start now. The fuel lines are not blocked (fuel can be
blown through) nothing seems to be blocking the carburettor as I have
taken it to bits and cleaned it. There is also sufficient compression
for the buggy to be lifted by the pull start. Yet I cannot get fuel
through to the cylinder (fuel is not sucked through the carb) even
blocking the exhaust and pulling the starter does not move fuel through
to the cylinder. The R/C chap at the local model shop is not back untill
the 10th. I know of no-one in the immediate area who deals with these
engines and as I am at a loss I thought of here .

Finally sussed . I had driven the needle (highspeed needle) so hard into
the housing that the tip had broken off and blocked the needle housing .
Thing is I hadn't put a lot of force behind it maybe it was a badly
designed/"friday" needle.

I was having trouble starting again so decided I would take the needle
to fully closed then open it to 3 turns.
SPECULATION :-with the cold getting to my hands I had put more force on
the needle than I thought, and snapped the needle.

The snapped end of the needle fully blocking the housing, so now the
engine wouldn't start no matter what I did. Model shop is getting a new
needle valve assembly which they are giving me FOC as there have been a
few of these snapped needles and the assumption seems to be it may be a
badly designed and if they just replace FOC no one will complain
properly, but if it happens again I will be complaining (I am not
complaining at the moment as I am not sure I didn't cause this breakage
myself (I don't think I did but...) ).

I suspect the needle was hardened but insufficiently tempered after
thus leaving it glass hard and thus brittle.

"soup" wrote in message ...
On 04/01/2012 19:39, soup wrote:
Really strange one this but does anyone know anything about small
(3.0cc) "nitro" engines? I cannot get it to start it was running but I
cannot get it to start now. .


Finally sussed . I had driven the needle (highspeed needle) so hard into
the housing that the tip had broken off and blocked the needle housing .

Old Suffolk punch engines suffered with that same fault, turn the mixture
screw right in only slightly too firmly and the tip would break off. I
rescued several from the tip and rejuvenated them with a 50p screw.

Mike