Crank with difficult starting
clarks at nbnet.nb.ca
Sat Mar 24 17:10:32 PDT 2012
> The Geep has been getting harder to start when warm. Cranks strongly, but
> will barely catch and fire (today was a question after stopping for
> fuel...). Cold, it starts up with the first stab almost every time.
> Don in GJ
Things to check - Are your valves in adjustment? Is the air filter clean?
Is the thermostat keeping your bike cool as it should? Is the choke working
correctly - is it truly shutting off all the way? Have the low speed carb
screws been changed to something other than stock? Are you sure that one or
more of the carbs does not have a leaking needle valve allowing more gas to
get to the motor from a over full carb or 2? - this would be good for start
up in cooler weather.
To state the obvious - you need spark - you have that the bike runs, you
need air but a dirty air filter can make starting good but can make the bike
get to much fuel during start up hot. Valves is really about compression or
the lack of - again starting a cold motor with less compression is less of
an issue then when the motor is hot. You need fuel but not to much or to
little - if a needle valve is leaking a bit you again can be OK at startup
but have issues when you try to start when warm/hot as there is extra gas.
The low speed jet setting helps or hinders warm/hot starting (no choke
needed starting) not enough fuel evaporates to quickly in a warm engine
during starting and a little choke can help but that is also a sign there is
something amiss - to much fuel will make things start good and you may not
experience riding issues as you run most times on the slope / tamper of the
carbs needle into the main jet/emulsion tube.
"It doesn't SEEM to be loading up on fuel if I put it on prime" thats good
cause it should not - prime is the position
you place the petcock in to flow fuel without the engine running and
operating the petcock by vacum (this is how to get the carbs full of fuel if
you have drained them etc). The needle valves in the carbs control the flow
and fuel level in the carb.
Hope this helps locate the problem or at least eliminate possible issues.
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