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Check your coils. The 2 coils operate 2 cylinders at a time. One coil cylinders 1&4 and the other coil 2&3 (hence only 1&4 firing). The easy way is to switch over the wiring to each coil at the loom side so coil number 1 is now wired with the wires that were fed to coil number 2 and number 2 with number 1. The HT leads to the plugs are not touched and remain as they are now. Fire up the bike and see if only the inner 2 cylinders now fire. If this is the case then the coil that is feeding the non-firing cylinders is suspect. It could be the coil itself or it could be the wiring that feeds the coil, only further investigation will determine, so get back to me and let me know the results.
The horn and sidestand issue sounds like a wiring or switch problem, let me have a think and I'll see if anything comes to mind. Regards, Steve.
The left coil goes to 2&3, the right coil goes to 1&4. This is as sitting on the bike cylinders from left to right 1,2,3,4. It doesn't matter which is connected to which cylinder (upper or lower on the coil) as long as left coil is connected to 2 and 3 and right is 1 and 4 as above. Once it is running correctly I would recommend marking the leads 1-4. This is done as standard at factory, but replacement parts don't always do this.
hi you dont say what model kawasaki you have im assuming you have a transverse four like a z1000 generally speaking as you sit on the bike the outer cylinders are 1 and 4 the inner cylinders are 2 and 3 ,now again im assuming you have two coils, each coil has two plug leads
coming out of them coil number one will serve cylinders 1 and 4 it doesnt matter which of these leads goes to either 1or 4 as bikes use a wasted spark system and will spark on the exhaust stroke as well, coil number 2 will serve cylinders 2 and 3 again it wont matter which plug lead goes to either 2or3 ok now for the tough part
you need to find the sparking point for no1 cylinder remove no1 spark plug probably the outer left cylinder as your sat on the bike and turn the engine over by putting the bike in gear (only do this with no plug leads connected as it could start unexpectedly in gear ) and push or bump the bike gently with the clutch out to bring the piston to the top of the bore a small torch would be handy for this to shine down the plug hole you then need to find a timing cover on the outside of the engine
you may need a service manual for this as there are many variations but usally there are two pick up modules one for each coil the timing marks correspond to each coil with cylinder 1 at the top of the bore the timing mark should be near number 1 pick up module now that you know which module number one is follow the wiring back to the coil ,each pick up wiring is a different colour like black and orange wires for one coil and black and green for another when you have found number one coil attach plug leads to it and fit them to cylinders 1 and 4 you then fit the remaining coil with plug leads to 2 and 3 cylinders refit the spark plug take the bike out of gear and go for a start good luck with this
The firing order on your bike is 1,3,4,2. These bikes use what is called a wasted spark system. They fire whenever the piston reaches top dead centre.
That is to say they fire on top dead centre compression as well as top dead centre rock-over( exhaust/inlet ). Each coil has two leads on them.
The left coil goes to number 1 & 4 cylinders.
The right coil goes to number 2 & 3 cylinders.
The GPX 750(like most road bikes) have a resistor type spark plug cap on them that was prone to cause problems.
To test the coils/caps, use a multi-meter to test their secondary resistance.
To do this set the meter to kilo-ohms(1000 ohms), place one meter probe in one plug cap & the other probe in the other plug cap( i.e. 1&4, 2&3 )
The meter should read 10kilo-ohms to 15 kilo-ohms.
If it reads higher than that try un-screwing each cap & test the coils with the caps removed by probing the leads. If the coils(without caps)read about 5 to
10 kilo-ohms, check the caps.
The caps should read 5 kilo-ohms each.
It is very common to find these open-circuited.
Replace any open circuit caps.
I hope this has been of some help.
Otherwise if you can be a little more spacific with your problem I will try to help further.