This is caused by mixture getting past the idle and being sucked into the combustion chambers and being ignited by the hot spots and combustion pressures
Very common on early english cars and some american cars
The japanese carbies had a solenoid valve that fitted into the idle circuit so that when the ignition was turned off , the solenoid closed off that idle circuit and prevented the problem
you may have to "play " with the idle mixture screws to get a better mix so that the mixture is too rich to run on or change the weber to a model that has the solenoid shut off
NO WEBer MODELS STATED,(LOTS)WHY ?
learn to brake and dump the clutch?
vast carb cars did this from 1884 to modern times
until the fuel cut off was added to the carb(2 wires)
cured on mid VWs 1975 or on high end models.(fancy carb)
but
even my new 1970' , ran on key off, all did ,every one made. (running the idle jet lean to cure this is nutz)
(0 idle solenoid cut valves for 90years)
when you turn the key off , spark ends
but the chambers are red hot
the idle jets are active, so fuel flows. how can it NOT?
it burns and driver, dumps clutch brakes set.
like natural for 80 years.
fast forward to 2017 and its all new experiences.... hark
so what is the soloution
1: put back the suzuki carb
2: get a weber with that feature.
3: add the fuel cut to yours, omg,hard,there. see xray of weber
oops...
4: lean to dump the clutch
5: just listen and laugh at OLD SKOOL carbs?
saying that timing is off, and mixture is wrong,
NO wrong, all did this with NO FUEL cut valves. all. did.
is OFF the MARK, im sure anyone how put on a weber
knows,its tuned custom to this tiny engine, and will have problems.
as all do. some WEBS are so big for the engine, the minimum flows fail at
WOT are WRONG, and the Venturi jets stall, (i digress... we are talking idle flows only.
hard code fact
that weber can be dyno tuned to perfection
and it will do that.
fact
a perfect engine with perfect fuel and no spark can run.key off. ask any old guy.
the worst were air cooled VW and motorcyles
but even old Toyota;s did this until the valve was added.
they'd never ever spend $5 on old corolla unless. was needed,fact.
here is a Weber fuel cut solenoid
it's missing (nor any place for it)
it's not wired right?
it's bad.(stuck open = bad)?
http://www.lceperformance.com/Weber-32-3...
guess what it does?
i bet a stick it is.stick shift
practices what all stick guys did for 80+ years,
1:stop car
2:hand brake on,and foot on brake.
3;key off
4:dump clutch in any gear.
in one day second nature,, (me,did 30 years)
one more. some fuels love to do this
like running winter fuel on hot day
winter fuel is more volatile.
It hit 96F here in texas, 2 days ago
hot. but my EFI cuts fuel,key off so....
why not up grade that sammi to 1994 stock Sammi EFI
and end the pain.
as seen here.http://www.fixkick.com/sammi-stuff/late-...
OR THE WEB IS DOWNGRADE FROM STOCK
SEE? YOU LOST THAT FEtAURE.
those idle mix screws. (not air mix type but fuel)
it's fuel mix. (adjuster)
if set too lean idle speed drops,(avoid that)
do not run lean. jets.
if i'ts too rich, sparks misfire and foul
set it to max RPM hot idle.speed.
this(SPOT) is about 12;1 AFR ,air fuel ratio
best of best. for best tip in, power, using clutch actions.')off the line power)
tune for that, only.
12:1 AFR is max power
14.7: is min smog.(like EFI cars do now)
.
but on carbs?, we run max power, !!!
due to not wanting lean out as the carb transitions to the next fuel circuits.BAD.!
run on (as its called),is a whole other issue.,
and in this case normal for your cheap fuel and carb. missing key parts.
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This is called "dieseling" and is generally a sign of incorrect engine timing.
bunk 100%
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