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Jeff,
It almost sounds like the bowl floats are set incorrectly or the float
valves are sticking....net result is too much fuel in the bowls which dumps
into the engine....mixture gets too rich, motor dies with a puff of black
smoke.
One quick way to check this without removing the bowls is to take one or
two spark plugs out after you've tried to start it and see if the plugs are
wet (fouled) with fuel. If they are, try tapping on the sides of both float
bowls with the wooden part of a hammer.....if some dirt got past the fuel
filter and is stuck in the float valve, you may be able to dislodge it.
If the problem doesn't point to stuck float valves or incorrectly set
floats, it may be time to check cylinder compression. If compression isn't
reasonably consistent across all cylinders, take the valve cover off; have
someone crank the engine while you watch the operation of each rocker
arm....I've seen bent pushrods and I've seen the rocker arm adjuster nuts back
off
completely and leave the pushrod just flopping around.....stuff happens!
Good luck
Chip Krout
Delaware Valley Triumphs, Ltd.
Delaware Valley Miata Club
Skippack, PA
In a message dated 7/11/2015 8:31:29 P.M. Eastern Daylight Time,
fishplate@gmail.com writes:
Interestingly, when I replaced the carb, it tried to start with an
empty bowl. But as it filled, it got more reluctant to start. Spins
like crazy, but no pop.
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<DIV>Jeff,</DIV>
<DIV> </DIV>
<DIV>It almost sounds like the bowl floats are set incorrectly or the floa=
t=20
valves are sticking....net result is too much fuel in the bowls which dump=
s into=20
the engine....mixture gets too rich, motor dies with a puff of black=20
smoke.</DIV>
<DIV> </DIV>
<DIV>One quick way to check this without removing the bowls is to take one=
or=20
two spark plugs out after you've tried to start it and see if the plugs ar=
e wet=20
(fouled) with fuel. If they are, try tapping on the sides of both fl=
oat=20
bowls with the wooden part of a hammer.....if some dirt got past the fuel=
filter=20
and is stuck in the float valve, you may be able to dislodge it. </DI=
V>
<DIV> </DIV>
<DIV>If the problem doesn't point to stuck float valves or incorrectly set=
=20
floats, it may be time to check cylinder compression. If compre=
ssion=20
isn't reasonably consistent across all cylinders, take the valve cove=
r off;=20
have someone crank the engine while you watch the operation of each rocker=
=20
arm....I've seen bent pushrods and I've seen the rocker arm adjuster=
nuts=20
back off completely and leave the pushrod just flopping around.....stuff=
=20
happens!</DIV>
<DIV> </DIV>
<DIV>Good luck</DIV>
<DIV> </DIV>
<DIV><FONT face=3D"Arial Baltic">Chip Krout<BR>Delaware Valley Triumphs,=
=20
Ltd.<BR>Delaware Valley Miata Club<BR>Skippack, PA </FONT></DIV>
<DIV> </DIV>
<DIV>
<DIV>In a message dated 7/11/2015 8:31:29 P.M. Eastern Daylight Time,=20
fishplate@gmail.com writes:</DIV>
<BLOCKQUOTE=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT=20
style=3D"BACKGROUND-COLOR: transparent" color=3D#000000 size=3D2=20
face=3DArial>Interestingly, when I replaced the carb, it tried to start=
with=20
an<BR>empty bowl. But as it filled, it got more reluctant to=20
start. Spins<BR>like crazy, but no=20
pop.<BR></FONT></BLOCKQUOTE></DIV></FONT></BODY></HTML>
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