building a stock 12a and needs help

rx4ur7 · 01-02-2010, 11:24 AM

Check to make sure the linkage for control of the secondaries is hooked up.

Right side of carb when looking at it from right side of car. Where you see the linkage near top of carb, return spring and there is a strange looking setup aft of that. There should be a coil spring around a shaft that has a 'T' nut on it (or it should). That has to be held in place near the top of the carb. The retainer is a fork type setup with a spring attached to it. Sorry do not have a shot of it, but if you check your FSM you will see it.

If that actuator is not hooked up you will not have any secondaries and you will be hard pressed to get over 80mph no matter what you do. It will also seem rather gutless like why does it take forever to get to 80? and why is the kid on his bicycle beating me to the next light?

If you want to check compression and you do not have access to a rotary tester you can get a quick and dirty idea using your finger and a friend. You can get a good idea by putting you finger over the trailing plug hole and see if there are even pulses. If it blows your finger off and they are even the motor is more than likely not the issue. If they are not even pulses and it does not try to blow your finger off you could be looking at internal problems. Those of us that have done enough of these can tell just by the sound when the trailing plugs are out what condition the motor is in.

You can also use a regular compression tester. You need to remove the schrader valve (check valve) you can then watch the gauge and see if you are getting even pulse pressures.

For the cold start issue, check plugs, wires and choke system. If cranking slow, battery and grounds.

01-02-2010, 11:24 AM	#12
rx4ur7 Rotary since 1972 Join Date: Nov 2008 Location: Tucson Posts: 231 Rep Power: 17	Check to make sure the linkage for control of the secondaries is hooked up. Right side of carb when looking at it from right side of car. Where you see the linkage near top of carb, return spring and there is a strange looking setup aft of that. There should be a coil spring around a shaft that has a 'T' nut on it (or it should). That has to be held in place near the top of the carb. The retainer is a fork type setup with a spring attached to it. Sorry do not have a shot of it, but if you check your FSM you will see it. If that actuator is not hooked up you will not have any secondaries and you will be hard pressed to get over 80mph no matter what you do. It will also seem rather gutless like why does it take forever to get to 80? and why is the kid on his bicycle beating me to the next light? If you want to check compression and you do not have access to a rotary tester you can get a quick and dirty idea using your finger and a friend. You can get a good idea by putting you finger over the trailing plug hole and see if there are even pulses. If it blows your finger off and they are even the motor is more than likely not the issue. If they are not even pulses and it does not try to blow your finger off you could be looking at internal problems. Those of us that have done enough of these can tell just by the sound when the trailing plugs are out what condition the motor is in. You can also use a regular compression tester. You need to remove the schrader valve (check valve) you can then watch the gauge and see if you are getting even pulse pressures. For the cold start issue, check plugs, wires and choke system. If cranking slow, battery and grounds. Last edited by rx4ur7; 01-02-2010 at 11:39 AM.