This being my second mech post today some may wonder if I can be helped :-) But here goes with my larger issue. PCM 302 raw water cooled probably mid 70s engine. Starts, idles, and runs fine up to about half throttle (2000rpm I am guessing) Push throttle from there to WOT and I get no addition rpms or speed. This happened the last two times out. Had to bring her home slow. Prior to that she ran normal. First effort to get at problem was a carb kit and complete disassembly, cleaning and replacement of all gaskets in Holley 450 from National carb. Carb is only a year old but I was afraid I had contaminated it with bad fuel. Put carb back on and the second trip out was the same. Fine until half throttle nothing after that. Does not stumble. Just does not respond. Verified secondaries opening but too dark to tell if getting fuel. Anyway moved on to suspect ignition. Installed new points and set timing. Test run in backyard is fine but have to go to ramp and test drive to make sure. However I am doubtful this solved the problem. Oh I also have checked the fuel pump and it seems to be functioning properly.
So while folks give this some thought I would add that about the time I noticed this bad behavior two rides ago I also noticed that my tach had taken a dump. Any chance this is a clue to the problem. Could a dead tach somehow impact the ignition system such to cause the kind of behavior I am seeing? Thanks...
So while folks give this some thought I would add that about the time I noticed this bad behavior two rides ago I also noticed that my tach had taken a dump. Any chance this is a clue to the problem. Could a dead tach somehow impact the ignition system such to cause the kind of behavior I am seeing? Thanks...
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