Hello!
My oldest 346xp (a 2010 - I have two 2011 as well) has a problem
- it seems clear it gets too much air - which makes it necessary to
choke it excessively in order to make it start - after that one must
more or less have it throttled all the time to make it "stay alive" -
and in doing so it revs more that it should and revs down very slow
and unevenly etc - TOO MUCH AIR must be the problem I have
concluded ... .
I have tried all easy fixes - including trying other carb, other spark
plug, other decomp valve, checking tank vent, chaning fuel filter etc
and so on ... didn't work - now I have dismanteled the thing into pe-
aces - I have the crankcase part with piston comin up from it still as
a (non-dismanteled) unit - but everything else is screwed loose ... .
There seems to be no obvious faults, unfortunately ... .
1) I can see that the fuel hose is a little weakened at the point were
it passes into the fuel tank - guess vibrations can cause that - I have
pressure tested it just a litlle with bicycle pump - seems clear
from that if there is a leak it is very very minute - as I couldn'rt see
any airbubbles in water tank with fuel hose submerged being some-
what pressurized by bicycle pump - could a very very minute leak
here still be the culprit?
2) The impulse hose (whatever is the functioning of that) seems very
intact except possibly that the fittings of it could be ever so slightly
"tired" (from vibrations I guess) ... could that be a problem?
3) I have quatilty fuel hosing in great supply with a slightly bigger
outer diameter than the original, so I was thinking of replacing all
hoses with new quality ones and drill just a little in the plastic to ma-
ke the the new ones fit ... ?
Something I have read about in workshop manual that I do not un-
derstand what it is - DIFFUSER JETS - WHAT IS THAT ? (It is
listed as a possible culprit in trouble shooting list - except for this one
and the items above I have tested everything ... .)
THANKS
My oldest 346xp (a 2010 - I have two 2011 as well) has a problem
- it seems clear it gets too much air - which makes it necessary to
choke it excessively in order to make it start - after that one must
more or less have it throttled all the time to make it "stay alive" -
and in doing so it revs more that it should and revs down very slow
and unevenly etc - TOO MUCH AIR must be the problem I have
concluded ... .
I have tried all easy fixes - including trying other carb, other spark
plug, other decomp valve, checking tank vent, chaning fuel filter etc
and so on ... didn't work - now I have dismanteled the thing into pe-
aces - I have the crankcase part with piston comin up from it still as
a (non-dismanteled) unit - but everything else is screwed loose ... .
There seems to be no obvious faults, unfortunately ... .
1) I can see that the fuel hose is a little weakened at the point were
it passes into the fuel tank - guess vibrations can cause that - I have
pressure tested it just a litlle with bicycle pump - seems clear
from that if there is a leak it is very very minute - as I couldn'rt see
any airbubbles in water tank with fuel hose submerged being some-
what pressurized by bicycle pump - could a very very minute leak
here still be the culprit?
2) The impulse hose (whatever is the functioning of that) seems very
intact except possibly that the fittings of it could be ever so slightly
"tired" (from vibrations I guess) ... could that be a problem?
3) I have quatilty fuel hosing in great supply with a slightly bigger
outer diameter than the original, so I was thinking of replacing all
hoses with new quality ones and drill just a little in the plastic to ma-
ke the the new ones fit ... ?
Something I have read about in workshop manual that I do not un-
derstand what it is - DIFFUSER JETS - WHAT IS THAT ? (It is
listed as a possible culprit in trouble shooting list - except for this one
and the items above I have tested everything ... .)
THANKS