1.....*First the coil is an ACCEL HEI Super Coil #140003.*
2....* At any rate, we finally located a vacum hose coming from the vacumm diaphram ( I think that is what it is called ) sits on the starboard side of carb, in front of the ele choke. The hose goes to the bottom front startboad side of carb. Question 1, would I hook the vacumum gauge to that?
3.... While looking over the engine, we moved the throttle, secondaries did not open. Ran the boat at the dock, with reved up the engine ( worked great ) but the secondaries did not open. My friend says this may be the vacumm diaphram.
4..... Another friend said that they will not open , unless under a load.
5..... One more thing, was not in the first post, hope this may help or mean something, to someone who has knowlegde. The best way to describe what the engine does at max throttle is , it almost seems and sounds something like a "rev limiter". I say this because I have one on my four stroke, MX bike.
6..... Friend says that could be because the secondaries are not opening. Again that is based on his beliefe that the the secondaries should open when the engine is reved up.
7..... Bedhind the throttle "linkage" ( where the cables sit in a brace ) is a black box. On the port side is a red button with 40 printed on it, behind this part is an electrical plug type set up. Anyone know what this is, or if it matters. For some reason, it just strikes me as it may be part of the problem.
8.... The guy at the parts store said there may be an ignition box for something to do with advance, could not find it.Could his be it.
1..... I have my suspicions that this is an Automotive ignition system installed on your Marine Engine!
If so, this is not legal for an enclosed engine, nor will it provide the correct advance curve for Marine loads!
2.... Pictures would better explain this port.
3.... If Rochester Quadrajet, the secondary throttle plate operation is mechanical.
The air door over the secondary throttle plates operates via manifold pressure, and when open, allows the the secondary fuel metering to occur.
IOW, the secondary plates are opening, but until the air door opens, the secondary fuel metering is not yet functioning.
4..... As good hearted as our friends are, it's always best to consult with experienced people.
5..... Again, check the progressive ignition advance.
It may or may not be related, but once you check this, it can be marked off your P of E list.
You'd recognize a "rev limiter" if one is installed.
6..... See #3 above.
7..... That is a circuit breaker (aka re-setable fuse) as per what Kim said.
The small black box (if I'm following you) is a five pin relay used in the "Start-by-pass" circuit. It should not play a role in your problem, per 'se.
I'd need to see your ignition system in order to suggest whether or not to abandom this.
8.... The ignition system may have been replaced.
Can you post photos of it for us?
1.... Again directions state to check timing and ignition, as Rick has stated also.
2.... Several friends ( all of which are not mechanics), are convinced it is in the carb or vacuum diaphragm at fault, as they claim this is what opens the secondaries.*
1.... Be sure that you not only check and set the Initial or BASE advance, but also check the progressive and TA (total advance).
Your manual will suggest a BASE advance, and may or may not suggest a TA.
The progressive and TA will be much more important.
Limited or no progressive advance, and your engine will not reach operating RPM under load.
2.... The AQ 260 used the Rochester Quadrajet carburetor.
Can you post photos of your carburetor?
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