nighthawk_lovers  

[Nighthawk Lovers] New nighthawk owner, new rider, new group member, new stalling/fuel problem? -- new new new

Joe '86 450
Thu, 04 Dec 2008 21:06:49 -0800

Hi All,

As the message header indicates I'm a recent addition to the nighthawk
group, new to nighthawks and new to riding. I own a 1986 450,named
Jenny by the previous owner,  that I picked up here in the L.A. area
with a questionable 18k on the odometer. Questionable only because the
speedo was swinging like mad on the test ride and stopped working
completely a week or so after I bought it. I now have about 200 - 300
miles on the bike, and things have been going well.

I've learned quite a bit since I've been lurking here ( the tires
aren't quite as new as the previous owner stated, that clunk into
first is somewhat normal, battery care etc) but I've come across a new
problem. I set off to work this morning with a detour to the gas
station (1.5 miles tops) to top off my front tire when the bike stalls
at about 40 mph. Feels just like I ran out of gas (tank filled the
night before). I checked the petcock thinking I had forgotten to turn
it on but it was good. I switched to reserve, no dice. I spent a
couple minutes rolling off the busy street,parking etc, opened my tank
to make sure I wasn't hallucinating about the full tank. I figured one
more try before the walk of shame home, and the bike fired up with a
little sputtering and then proceeded to run fine all the way to work
( ~20 miles @ 35 mph)

So, onto the ride home. About 20 min. into the ride at ~40 mph I feel
the bike start to stumble, I reach down and switch to reserve thinking
some sort of blockage on the intake, and it clears up. Another 10 min.
down the road a big stumble and several stalls from a stop ( being a
new rider I assume with my fingers crossed that it is me but that
wears thin with the third stall). Repeated starts and stalls,
switching to reserve and then it clears up for another 5 mins. Another
stall and this one lasts about 5 ~ 7 minutes, the bike has been on
reserve since the last stall. Playing with the petcock again, opening
the tank and resting and the bike fires up and I ride the last couple
of minutes home. The last clue comes as I shut the bike off and start
to back it into the garage-- I hear a faint hissing sound and its
coming from the gas cap. I open the tank and there is a hiss as the
pressure equalizes(in or out I don't know). Mind you its only been
about 3/4 to a mile since I last opened the tank. So, my guess is some
sort of fuel system blockage/slowdown that starves the bike for gas
and then manages to clear up. I have decent car repair knowledge but
am new to bikes and am hoping for a few pointers. Thanks for taking
the time to read this far and for any help you can offer.

Joe in Altadena

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