Getting an AGM maintenence free battery is a good idea for the Vulcan 750.
If you want to do a few less expensive (and helpful) things, here are a few:
Replace the stock spark plugs with iridium plugs. Part#: NGK DPR7EIX-9
Iridium plugs provide a more concentrated spark for more energy delivered to the air/fuel mix. Pow!
Run the air/fuel mixture screws all the way in until they seat (gently). Then run them out to 2-1/2 turns.
This is regarded by most as a good starting point for the correct air/fuel mixture.
Clean and grease (dialectric) the batt(-) ground connection to the frame. Clean the batt(-) connection to the engine. Clean and grease the batt(+) connection to the starter motor in the front of the bike.
Clean and grease the stator wire bullet connections, and all R/R connectors.
This will help with good and nicely regulated charging.
Re-gap the ignition coil pick-ups to have a .020” clearance.
This mod will provide a more certain trigger to the ignition module. It theoretically advances the spark slightly, though probably negligible.
Run 3 oz. of Seafoam in a fresh tank of gas about every fourth tank.
This helps keeps those itsy-bitsy idle jet orifices clean.
These are inexpensive things you can do, and they all help the bike start and charge reliably.
P.S. - Go ahead and check the sync on the carbs ... never hurts.
'91 VN750 - Cosmic Splendor/Candy Wine
Done: Coastered, .020 ign., Iridiums, VM
Plexistar II, MCCT's, Relocated MOSFET
Will Do: Horns, Shave(maybe)
Last edited by ZCraggRatt; 07-11-2011 at 12:14 AM.