Hey Jeff. It only starts [right up] when I hold a touch of throttle
and positioned in full choke. Thereafter getting it to self-idle on
max choke isn't a go and it die instantly if you lower the choke.
Something has definitely changed. Using no or less choke doesn't
work at all. Running the starter and switching no-full-no makes no
difference. When cold, I always had to start it on full choke, so
this won't change. And even in the present condition, once it's 10-
20 seconds warm, adding choke will kill it or make it run very rough.
After the valve job, it ran great. Started right up and ran even
better than before the valve adj. I rode Great Sand Dunes and had no
problem. It wasn't until recently I did a rather fast ride out to
Steamboat Springs did I notice the problem.
Once I arrived at a trailhead, I parked it and disappeared for 5-days
into the bush. When I got back, that's when I noticed the bad
starting condition. I have an IMS plastic tank and in-line filter,
so gunk/rust/moisture in the carb not likely save the entry via the
air cleaner. I just cleaned it and only the filter skin had light
dirt. No change to start-up problem. Also, I refueled on the way
home, so really doubt fuel contamination. Yet I don't completely
rule out something getting into the carb.
I'm going to run some compression tests (maybe leak down, too) and
see what I get. Anyone have data on this to compare my results? I'm
not too inspired to go back an re-inspect the valves after --- In
DSN_KLR650@yahoogroups.com, Jeff Saline wrote:
>
> On Thu, 14 Aug 2008 02:57:41 -0000 "traderpro2003"
> writes:
> > From a cold start, I used to set the choke on full and it would
start
> >
> > right up and run at high idle. Now, with full choke it won't
even
> > start unless I give it a little throttle and hold it. Once it's
> > started if I release that little bit of throttle it sounds like
it
> > hasn't run in awhile (thud thud thud) and doesn't idle higher.
But
> > if
> > I hold a bit of throttle it runs fine. Then maybe 20 seconds it
> > runs
> > like normal and once I get out on the road it runs normal and
idles
> >
> > normal.
> >
> > Before I go too deep, any thoughts what to do/check? It has fuel
in
> >
> > the line (see through filter and used an allen wrench to drip
some
> > from
> > the bowl), no holes in the fuel petcock vacuum line, I cleaned
the
> > air
> > filter, did a general 'nothing weird' visual inspection...even
> > splashed
> > some Fat Tire Ale on it...nothing helped.
> <><><><><><><><><>
> <><><><><><><><><>
>
> traderpro2003,
>
> Your comment that with full choke you must hold the throttle open
for
> about 20 seconds suggests it's running rich.
>
> Have you tried not using the choke or using less choke when
starting?
>
> Holding the throttle part way open allows more air into the mixture
> leaning it out. A cold engine needs a little bit richer mixture to
start
> but once running with the combustion chamber warming it can quickly
be
> leaned out. i.e. reduce the amount of choke used.
>
> When was the last time you checked valve clearances and what did
you set
> them at? Some folks report that when the clearances close up the
choke
> starts acting like an on/off switch with no middle ground.
>
> I'm surprised splashing Fat Tire Ale on it didn't help.
>
> Best,
>
> Jeff Saline
> ABC # 4412 South Dakota Airmarshal
> Airheads Beemer Club
www.airheads.org
> The Beautiful Black Hills of South Dakota
> 75 R90/6, 03 KLR650, 79 R100RT
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