#1: '81 xv750 won't fire (SOLVED)
Author: scrow, Posted: Sun May 23, 2010 2:56
pm
I was given a virago over a week
ago and I've spent a lot of time researching and working on the bike to
get her running. I have read many threads where people have been helped so
much by this forum, so I'm hoping to benefit in the same way.
A
little about the bike: Mostly garage kept, 50,000 miles on the bike,
looks like it has been maintained well by the one and only previous owner.
He did most of the work on the bike himself.
This is what I've
done so far: -New battery - fully charged -Cleaned the carbs -
probably the first time the carbs have been thoroughly cleaned (other than
the float bowl), i did not break open the pilot adjustment chamber yet
-Rebuilt the starter solenoid (after it stopped working on me - took
it apart - looks like the copper contact area was not allowing good
conduction) -Compression test on both cylinders around 130 psi
-Using old spark plugs checked for spark (spark is present but it may
be weak - not sure the difference between a weak and strong spark)
-Installed new spark plugs -The starter motor cranks the cylinders
(obviously if i was able to do a compression test)
Okay when I try
to start the bike it won't fire. So i tried to push start it to see if it
would fire that way. The push start yielded a few put, put, puts but did
not start (I was pushing by myself so i probably didn't go fast enough)
Here are my thoughts thus far, perhaps the spark is not strong
enough and the ignition system connections or caps need replacing or
cleaning. Or perhaps the infamous bendix spring clip is not stopping the
gears to allow them to pull away from the flywheel. Or perhaps the starter
motor is slipping under larger loads and will not spin the flywheel fast
enough to get the engine started.
After i tried 8 push starts or
so with the new spark plugs i removed the pugs and found fuel on the
plugs. So i know I have some spark, decent compression, and fuel. Lastly I
keep reading about the o-rings on the carb manifolds. The manifolds were
recently replaced by previous owner, but there were no oring in the groove
of the carb output (engine intake). There are only cable clamps. Could a
leak at the manifold not cause the engine to fire? I should probably get
orings if I can does anyone know the size of these orings? Thanks in
advance...
Last edited by scrow on Tue
May 25, 2010 8:55 am; edited 1 time in total
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