Losing power to front coil upon acceleration - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 4 (permalink) Old 02-15-2011, 05:03 AM Thread Starter
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Losing power to front coil upon acceleration

I took my bike out for a ride today, weather in the mid 50's, she ran great until I was heading home after about a 10 mile ride, and she started losing power and not accelerating. It did it for roughly a half mile, and I thought it was fuel related, then I happened to look at my tach, and the RPM's were at zero.
It would idle fine, and accelerate fine to about 2,500 RPM's, then just not go any further.
I played with the kill switch on the handlebar, and the key but nothing happened while I was riding.
My charging system works fine, and the battery has a full charge.
Any ideas? I'm going to take my key switch apart tomorrow to see if it's dirty or corroded inside like the other switches were.
BTW I had the front coil off the other day, and had a problem with it working after I put it all together, but I have ridden it approx 30 miles after that w/o any problems.
Thanks all.
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post #2 of 4 (permalink) Old 02-15-2011, 05:52 AM
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post #3 of 4 (permalink) Old 02-15-2011, 08:58 AM
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I am having trouble imagining the fuel system having any effect on the tach. The tack is driven by the IC ignitor. I would definately test the pickup coils, and check all coil connections from the ignitor IC. I am not sure, and maybe someone with more knowledge on the subject will chime in soon, but I think the ignitor IC controls the ignition advance. If it is not receiving the rpm from the pickups, it will not advance the spark, allowing the engine to rev up. If all the wiring checks out, it could be a bad pickup or ignitor IC. Hopefully someone else will correct me if I am mistaken. But I do not think it will be a fuel related problem if your tach was dropping to zero.

~~C8> Ratt
________________________
'91 VN750 - Cosmic Splendor/Candy Wine - 10k mi.
Done: Coastered, .020 ign., Iridiums, VM, Plexistar II, MCCT's
Next: LED's
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post #4 of 4 (permalink) Old 02-15-2011, 09:25 PM
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The fuel won`t affect the tach.

The tach sensor wire reads one of the front coil plug wires, so no spark to the plugs and no tach reading are related.

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
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