244 coughing

[bonspiel]

Greetings from NZ.
244, 2.1 ohc manual, 1978-ish, with an overhauled motor and single
Stromberg is coughing and hesitating at a steady speed. It misses and
even occasionally backfires on a steady throttle or when you put your
foot down, then it runs smoothly while accelerating. Could it be a
blocked jet? It had been sitting for a while before I bought it back a
couiple of weeks ago. Advice sought and gratefully received; may be
also looking for a diagram of the carb and location of jets. TIA and
cheers

 

[Peter Milnes]

Don't forget the ignition circuitry.

Cheers, Peter.

: Greetings from NZ.
: 244, 2.1 ohc manual, 1978-ish, with an overhauled motor and single
: Stromberg is coughing and hesitating at a steady speed. It misses and
: even occasionally backfires on a steady throttle or when you put your
: foot down, then it runs smoothly while accelerating. Could it be a
: blocked jet? It had been sitting for a while before I bought it back a
: couiple of weeks ago. Advice sought and gratefully received; may be
: also looking for a diagram of the carb and location of jets. TIA and
: cheers

 

[Stewart Hargrave]

Because there's more to the internet than hits alone,

Greetings from NZ.
244, 2.1 ohc manual, 1978-ish, with an overhauled motor and single
Stromberg is coughing and hesitating at a steady speed. It misses and
even occasionally backfires on a steady throttle or when you put your
foot down, then it runs smoothly while accelerating. Could it be a
blocked jet? It had been sitting for a while before I bought it back a
couiple of weeks ago. Advice sought and gratefully received; may be
also looking for a diagram of the carb and location of jets. TIA and
cheers

It may be a fueling problem, but start with the ignition before making
any adjustments to the carb. Ignition needs to be set up properly to
make any sense of subsequent fueling adjustments.

Is '78 points ignition? If so, start by checking the ponts gap, and
set the ignition timing correctly. If there is no improvement, start
checking the condition of ignition parts and replace if in doubt. This
includes spark plugs, points and condenser, the distributor cap and
rotor arm, possibly the coil and all leads. Faults here can be
invisible to the naked eye, so if in doubt replace with new. Also,
find the little tube that goes to the vacuum advance unit (a small
flying-saucer on the side of the distributor), pull it off where it
plugs onto the inlet manifold or carburettor, and suck on it. There
should be some resistance. If the distributor cap is off, you should
see the base plate inside move. If none of this happens and the tube
is not blocked, the the vac. unit is probably duff.
--

Stewart Hargrave

Never wear a hat that has more character than you - Utah Philips


For email, replace 'SpamOnlyToHere' with my name

 

[bonspiel]

Thanks, will do ignition items one at a time.

 

[Anton Sather]

Could it be the timing belt? Discovered mine had jumped a notch, tho no
indications of a problem. Fortunately the mechanic picked it up & fixed it.