In essence, you've built one engine out of two engines and we have no idea if the parts you're using may have a slight design difference, the wrong jets, whatever... so you're more or less on your own in many areas. Such as in the case of carburetor jets, you'll need to look them up here in the forums parts list, a factory parts manual if you have one, other forums, etc.
However, the spark looking okay and the compression being around a certain number doesn't cut it..... you need to be precise as in.................
Compression: All spark plugs removed... what are the actual psi compression numbers of the individual cylinders? Standing in back of the engine, facing the spark plugs, the cylinders are numbered as:
2.....1
4.....3
Spark: Still with spark plugs removed, the spark should jump a 7/16" air gap on all cylinders with a strong blue lightning like flame... a real SNAP! Does it? Note that small single cylinder air gap testers are available at auto part stores.
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(Spark Tester - Home Made)
(J. Reeves)
You can use a medium size philips screwdriver (#2 I believe) inserted into the spark plug boot spring connector, then hold the screwdriver shank approximately 7/16" away from the block to check the spark or build the following:
A spark tester can be made with a piece of 1x4 or 1x6, drive a few finishing nails through it, then bend the pointed ends at a right angle. You can then adjust the gap by simply twisting the nail(s). Solder a spark plug wire to one which you can connect to the spark plug boots, and a ground wire of some kind to the other to connect to the powerhead somewhere. Use small alligator clips on the other end of the wires to connect to ground and to the spark plug connector that exists inside of the rubber plug boot.
Using the above, one could easily build a spark tester whereas they could connect 2, 4, 6, or 8 cylinders all at one time. The ground nail being straight up, the others being bent, aimed at the ground nail. A typical 4 cylinder tester follows:
..........X1..........X2
.................X..(grd)
..........X3..........X4
This can obviously be modified to a 6 or 8 cylinder setup tester.
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