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post #1 of 13 (permalink) Old 06-05-2011, 12:06 AM Thread Starter
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One more question

Hey guys one more question, i put it in here cause im not sure if its a fuel or electrical problem.

My bike just doesnt want to start, it turns over until it kills the battery. (sometimes its fine)

the wiered thing is that as soon as i put the 12 v charger on it it fires right up, pretty much immediately.

SO i guess im trying ot figure if its not getting gas or if maybe its electrical and its not getting spark until the full 12 v from the charger is there.

or maybe having the charger turns the starter faster and its more likely to start, just looking for ideas again.

THanks guys

1992 vn750, 16000 miles
seat shaved , lowered 2 inches in rear, ears shaved, degoated, cpanel is gone just a drag specialties 2.5" speedo
awaiting some pipes
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post #2 of 13 (permalink) Old 06-05-2011, 12:43 AM
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Since the engine fires right up when you boost it, fuel is not the problem.
Electricity is.

Put the battery charger on for a few hours, then take it off and let it sit for 2 hours.
Check the voltage. Do you have at least 12.5 vdc.
If not, --- you need a new MF-AGM battery.
http://cgi.ebay.com/ebaymotors/Deka-...item3eee173adb

The battery can have enough power to spin the starter, but not enough voltage left to create a hot spark.

NGK Iridium DPR7EIX-9 spark plugs can make a difference too.

This pick-up coil regap modification is said to increase the spark`s heat as well.
https://www.vn750.com/forum/showthread.php?t=18550

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/11-vn750-general-discussion/9127-top-ten-items-you-would-suggest-new-owner-do-his-new-ride.html

Last edited by OlHossCanada; 06-05-2011 at 12:55 AM.
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post #3 of 13 (permalink) Old 06-05-2011, 01:10 AM Thread Starter
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THanks Olhoss, i was kinda thinking along those lines, but wasnt sure if something like that was even possible (never had anything to do with bikes until now).

Ill the check and see if im shy a few volts.

THanks again

1992 vn750, 16000 miles
seat shaved , lowered 2 inches in rear, ears shaved, degoated, cpanel is gone just a drag specialties 2.5" speedo
awaiting some pipes
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post #4 of 13 (permalink) Old 06-05-2011, 05:49 AM
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Hey man.....OLHOSS is exactly right. I used to have the same issue. I upgraded to that Deka MF-AGM battery (X2 Xtreme battery from Batteries Plus.....it is the DEKA). Installed Iridium plugs....NGK or DENSO is fine. I also changed the pick-up coils gap.....this "IS" a modification, but well worth the time spent. ONE OTHER THING.....that I later found out that can cause hard or no starting.....check your power cable to the starter at both ends....my cable at the starter had got very loose (the nut holding the lug terminal had backed off under the protective boot about 1/16th of an inch....causing a very weak connection. Since I did all of that.....you barely hit the start button....and she fires right up.....no real "cranking" about it.
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post #5 of 13 (permalink) Old 06-05-2011, 07:37 AM
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Quote:
Originally Posted by OlHossCanada View Post
Since the engine fires right up when you boost it, fuel is not the problem.
Electricity is.

Put the battery charger on for a few hours, then take it off and let it sit for 2 hours.
Check the voltage. Do you have at least 12.5 vdc.
If not, --- you need a new MF-AGM battery.
http://cgi.ebay.com/ebaymotors/Deka-...item3eee173adb

The battery can have enough power to spin the starter, but not enough voltage left to create a hot spark.

NGK Iridium DPR7EIX-9 spark plugs can make a difference too.

This pick-up coil regap modification is said to increase the spark`s heat as well.
https://www.vn750.com/forum/showthread.php?t=18550
All good suggestions, but to be clear, the pickup coil mod has nothing to do with spark output.....just timing, and perhaps a 'better' signal to the igniter.
You may want to consider the ignition coil mod.....this does increase spark output by providing higher voltage to the ignition coil's primary.
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post #6 of 13 (permalink) Old 06-05-2011, 10:44 AM
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1986 Black Kawasaki Vulcan VN750 "Black KAWK"
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EMGO Handlebar, V&H Exhaust, Drop Shocks, Raised/Painted Fork, MeanStreak Seat, Tank Bib, ME880 Oversize Tires, Engine Guard, Custom Mirrors, Chris Products Turn Signals, Ear Shave, 150/42 Jets, PINGEL Fuel Valve, MCCT, Volt Meter, Shendegen R/R, AGM Battery, Coastered, .020 Coils, Relo Gauges & Headlamp, SilverStar Ultra, LED Flashing Brake Light, Center Stand Delete, WOLO Airhorn.
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post #7 of 13 (permalink) Old 06-05-2011, 11:54 AM
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Quote:
Originally Posted by dariv View Post
All good suggestions, but to be clear, the pickup coil mod has nothing to do with spark output.....just timing, and perhaps a 'better' signal to the igniter.
You may want to consider the ignition coil mod.....this does increase spark output by providing higher voltage to the ignition coil's primary.
Yes, you are right. I believe the pick-up mod increases the timing advance, but mis-spoke myself here. I was nodding off when I wrote that.

X2 to the ignition coil mod.^^^ It does provide a hotter spark.

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/showthread.php?t=9127
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post #8 of 13 (permalink) Old 06-05-2011, 12:16 PM
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In most cases like this, installing a good AGM battery is all you need to do, although the iridium plugs ain't going to hurt.....

Way back when dinosaurs ruled the earth, my bike developed the same problem. A Westco battery cured it.

As an aside, it was the search for that answer that brought me to the Vulcan online community...making that hard starting problem the reason I am here today.

So a good thing or a bad thing depending on your view point.....

Knifemaker

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post #9 of 13 (permalink) Old 06-08-2011, 12:14 AM Thread Starter
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sweet thanks again guys, definitly got a funky battery in there

1992 vn750, 16000 miles
seat shaved , lowered 2 inches in rear, ears shaved, degoated, cpanel is gone just a drag specialties 2.5" speedo
awaiting some pipes
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post #10 of 13 (permalink) Old 06-08-2011, 07:32 AM
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I had a new battery and mine was still hard to start. It would hit several times before it would fired up. Put the NGK Iridium DPR7EIX-9 spark plugs in and it fires first touch of the button no matter if it's hot or cool now. And also remember, never touch the porcelain part of the plug as the spark will travel body oils to the nearest ground. Using an old long spark plug boot to hold the plug during installation is the best way to install a plug.

Last edited by Chuck A.; 06-08-2011 at 07:38 AM.
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