Carburetor Question - Is this a good call?
An engine reving and dying or nearly dying is often an engine too lean.
If this happened right at start up, could it be choke settings?
Might need to give it some help until its warm enough.
if you do take the carb off, before putting it back on, check the throttle openings.
The secondary throttle should be nearly shut. No transfer slot will be visible when viewed from underneath.
On the primary side, a little bit of the transfer slots should be visible.
Since there is a choke and a fast idle cam, make sure they are open and the 'idle speed screw' is what is keeping the primary throttles from closing any more.
On a 4150/60 type carb in particular, it is critical that .020 to .040" of the transfer slots show.
If its neccessary to open the throttle outside of the range to keep the engine running, then we need to adjust timing or air through PCV valve etc.
Its best to write down how many turns of the stop screw to open the throttle to .020, .030 and .040 inches while the carb is off.
Shank of drill bit next to transfer slot.
Primary throttles opened further showing most of transfer slot.
An engine reving and dying or nearly dying is often an engine too lean.
If this happened right at start up, could it be choke settings?
Might need to give it some help until its warm enough.
if you do take the carb off, before putting it back on, check the throttle openings.
The secondary throttle should be nearly shut. No transfer slot will be visible when viewed from underneath.
On the primary side, a little bit of the transfer slots should be visible.
Since there is a choke and a fast idle cam, make sure they are open and the 'idle speed screw' is what is keeping the primary throttles from closing any more.
On a 4150/60 type carb in particular, it is critical that .020 to .040" of the transfer slots show.
If its neccessary to open the throttle outside of the range to keep the engine running, then we need to adjust timing or air through PCV valve etc.
Its best to write down how many turns of the stop screw to open the throttle to .020, .030 and .040 inches while the carb is off.
Shank of drill bit next to transfer slot.
Primary throttles opened further showing most of transfer slot.