Alright guys, here’s what I’ve got:
Working on a 72’ fj40 for a buddy; completely stock. Had the carb rebuilt by a reputable builder and it was ported for vacuum advance. Added a brand new Toyota vacuum advance distributor and Pertronix ignition.
Installed the carb and distributor, set timing and it idles at 650 RPM. Idles and runs smooth UNTIL you transition from 3/4 to FULL throttle, then it stumbles for a split second and picks back up. 18” of vacuum on the gauge at about 800’ elevation. When I pull the choke, the stumble goes away when transitioning to full throttle.
Other issues: when the engine is at operating temp, and I rev the engine up it pours black smoke out the exhaust. I’ve noted the fuel level is more than 3/4” of the way to the top of the sight glass (I’ll add a photo).
Accelerator pump produces a decent stream, but it also produces several smaller streams that seem to be shooting out around the deal, but inside the carb. New plugs, wires, and I even tried a different coil after verifying correct voltage to the coil. No vacuum leaks and cable/linkage all smooth.
My question is does anyone think the overfull bowl is causing the stumble at full throttle? I don’t mind readjusting the float level, but I’m concerned the accelerator spray pattern may also be an issue so I don’t want to take things apart and have the rebuilder blame me for messing something up.
And yes, I reached out to the builder, had a few conversations around trouble shooting, but haven’t heard back in several weeks after leaving multiple messages.
Buddy is ready to have his cruiser back, so I’d like to get this figured out. Thanks!
Working on a 72’ fj40 for a buddy; completely stock. Had the carb rebuilt by a reputable builder and it was ported for vacuum advance. Added a brand new Toyota vacuum advance distributor and Pertronix ignition.
Installed the carb and distributor, set timing and it idles at 650 RPM. Idles and runs smooth UNTIL you transition from 3/4 to FULL throttle, then it stumbles for a split second and picks back up. 18” of vacuum on the gauge at about 800’ elevation. When I pull the choke, the stumble goes away when transitioning to full throttle.
Other issues: when the engine is at operating temp, and I rev the engine up it pours black smoke out the exhaust. I’ve noted the fuel level is more than 3/4” of the way to the top of the sight glass (I’ll add a photo).
Accelerator pump produces a decent stream, but it also produces several smaller streams that seem to be shooting out around the deal, but inside the carb. New plugs, wires, and I even tried a different coil after verifying correct voltage to the coil. No vacuum leaks and cable/linkage all smooth.
My question is does anyone think the overfull bowl is causing the stumble at full throttle? I don’t mind readjusting the float level, but I’m concerned the accelerator spray pattern may also be an issue so I don’t want to take things apart and have the rebuilder blame me for messing something up.
And yes, I reached out to the builder, had a few conversations around trouble shooting, but haven’t heard back in several weeks after leaving multiple messages.
Buddy is ready to have his cruiser back, so I’d like to get this figured out. Thanks!
