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THANK YOU EVERYONE.. but crap . still had another awful track day . thats three wasted days in last four...
Another disaster…simply no power…. I found one coil wire with low resistance. ( one coil wire had 4k ohms res., the other showed 0.8 k ohms res. .. changed it..) . had no effect… coils are fine by the primary/secondary ohms test,
Scott the motor will start and run on either MSD box alone when cold, just firing one of the sets of plugs. i did this by simply pulling one of the coil wires from the dizzy. i did not ground it as you suggested.
The MSD boxes are wired as completely separate units to fire a single set of plugs. each box has its own coil. The pig tails coming out of the Bruns distributor have green and orange wires with a plastic connector that snaps directly into the connector from the MSD box... (hard to screw that up). both boxes, for both 12v operational power and the +/- high tension lines are connected at the same places: both high tensions directly to battery. 12v to power the units is separately fused and is run thru the cutoff-switch. ( online it says this may be a problem)
Its the same pattern every time…. First lap is fine, then starts losing power and pedal in second. by third lap, Flooring it down the straight will not go over 3-4 k….its actually stalling when i downshift at corners... Pulling into the pit it dies. This last time I actually I coasted back to hauler. Trying to restart it. Engine turns over fine so battery good but motor does not start .. …. when I get to trailer it still will not start ( i did not check spark output during this no-start period, which i should have done) . i also did not check if either the msd boxes ( mounted on the inside of the cockpit firewall, with good ventialtion and shock protection) or the coils ( mounted inside the engine compartment on drivers side) . were hot. google tells me that these boxes can be affected by heat..
Even when motor will not start, the site glasses in both carbs are fine with fuel…..fuel pressure at the analog meter on the regulator shows 5lbs.. just where i left it. ( i do not have another fp meter)
then, i let it sit for 15-20 minutes. Starts back up fine....
really do not know what to think. hard to imaging both MSD boxes going bad at once ?
thanks for your comments
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