Question about Honda CB 750 Motorcycles
Whats the firing order on a 1974 cb750 . the coil numbered 1 though 4. Is that how put them to the engine?
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Posted on Jan 02, 2017
Sounds like you had an exhaust valve tighten up, check them at TDC top dead center by removing the alternator cover derby, put the bike in neutral, turn the flywheel in correct direction (arrow on it) until the TDC marks for 1 and 3 are aligned, check ex valves .003" or if you can barely feel them move is how I adjust them. :) If you lose compression or fire on a cylinder it becomes an oil syphon that will cause blue smoke and backfire as you had. It could also be a set of points closed up or a bad capacitor on the points. Intake valves are .002" .
Posted on Oct 08, 2009
SOURCE: miss fire on number 1 cyl
I would have to say that I think it's not miss fireing.
It could be the coil for those 2 cyclinders. It could be in the carbs. When you cleaned the carbs did you remove them from the engine and dismantel them completly? Clean every parts and blow out all the air and fuel ports. Did you seperate the carbs from each other? If you did the carbs will need to be synced again. Good Luck.
Posted on Oct 16, 2009
SOURCE: timing & firing issues
G'day. I can help you here! On all early model japanese 4 cylinder motorcycles,
number 1 & 4 cylinders share one coil( the left hand coil as seen while sitting on bike). Number 2 & 3 cylinders shares the other.
L/H coil- 1 & 4
R/H coil-2 & 3
Hope this helps
Regards Andrew Porrelli
Posted on Mar 31, 2010
check pulse coil generator system...i had a similar problem and found out that one of the two pickups was burnt. mine was on the left side of the bike under side case cover but i just followed the wire harness up till i got to the first disconnect and ohmd out the four wires looking for 400-450 ohms...well i only got 136ohms on one and the other was completely open. Also make sure your getting 12v to the coil... turn key on and just probe the little wires on the coil till you find it. then you'll know that its not a broken wire at least. Can i get some feed back, Thanks!
Posted on Apr 21, 2010
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