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Discussion Starter #1
g'day
rebuilt a 1986 vn 750 bcant get to start.cranks slow.take out a plug in each cylinder and cranks freely.replaced jumper coils.ignition coil,main coils.good spark.can get cylinders to pop.HELP please.timing good
 

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weak battery is likely, or a bad ground connection. Possibly a starter problem as well.

with the plugs removed, its relatively easy to crank the engine over. put the plugs in, and the effort increases a LOT. I suspect battery or connection problem, because without the plugs, it the starter wont pull as many amps (battery can supply enough, or the suspect connection is allowing enough amperage to flow). Put the plugs in, and the starter will draw in excess of 200 amps, and the battery and all associated cables and connection need to be top notch to enable that much current to flow properly.
 

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Jump it with a car battery. If still to slow, check starter wire. Clean it with sand paper. Bypass celinoid. Just a few thoughts.
 

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Dont run the car when jumping though....it can fry the electrics....
If you have manual cam chain tensioners on it, could be too tight....
 

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X2 - Don't jump it with the car running, it can fry the R/R pretty quick.
 
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