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1986 VN750
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My bike doesn't want to start when the motor's hot. Will this Mod help this problem?
Thanks:motorcycl
Possibly but I would look at a new AGM battery first before making this mod - the battery sorted my hot-start issues out.
 

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Engine Coil Modification

Spectacular!!!

It was difficult, only because a screw was stuck and i went crazy trying to get that thing off. Finally got it, then could not figure out what the gap was, because nothing was specific on any of these threads. Figured that out.

The metal was tough to file down, but i got it done. Took me about 3 hours and a lot of headache...but i took her for a ride this morning...WOW.

I have increased engine power. Great. I did it because i was having problems with hot starts. Now it started in 2nd gear, hot. I was shocked.

Just a wonderful modification. Thanks
 

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3 questions:

1) are you trying to move the coil closer to the center of the "circle"?

2) is that the sator behind the coils?

3) 1 pair of wires that come out of the case on the upper right are for the coils i assume, what about the others?
 

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Linkmeister Supreme
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7,960 Posts
3 questions:

1) are you trying to move the coil closer to the center of the "circle"?

2) is that the sator behind the coils?

3) 1 pair of wires that come out of the case on the upper right are for the coils i assume, what about the others?
A1. Yes
A2. The coils are the stator, (as in stationary). The metal bowl shaped part that rotates around and behind the stator is the rotor. It has a small magnet fixed in the side that trigger a pulse in the ignition pickup coils when it rotates past.

A3. There are 2 sets of two wires coming from the pickup coils,
and 3 yellow stator wires carrying 50-70 volts AC to the reg/rectifier where
Alternating Current (AC) is "rectified" to Direct Current (DC), and regulated to approx 12-15 volts.
 

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okay, so im new to vn750, sorry to revive this thread
got her after many hands, so bits are worn out
1-i got snatced/snapped pickup coil (PUC) wires
2-i dont know either my pickups are modded on the magnet point

so i set my PUC to far left (original place) n check the gap....
MASSIVE, i got 1.00mm (or marked 100) blade to slip in between

my Q's
1- when y'all say .020, that thing is in MM guage rite? .020 = 20 marked blade
----since i got a guage that marked 0.05-1.00mm, i need 20's blade???
2- on my snapped PUC, there are marked 1 dot n 2 dots, are they different??
----if they are, which is top n which is bottom??
3- whats the original PUC protrusion (magnet nipple) length?
----i checked mine, .090 blade sit flush, are they grinded off?

thats all for now, thanks for ur time
 

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..have a vulcan good day!
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4,508 Posts
my Q's
1- when y'all say .020, that thing is in MM guage rite? .020 = 20 marked blade
----since i got a guage that marked 0.05-1.00mm, i need 20's blade???
------0.020 = 20 thousandths of an inch

WilliamTech
 

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owch... lucky i did not start her with that gap...
tomorrow i'll find an inch guage
thanks will. so my third Q is out of zone already
how bout no 2?? i know the wires are diff colors, but whats the dots for??
 

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owch... lucky i did not start her with that gap...
tomorrow i'll find an inch guage
thanks will. so my third Q is out of zone already
how bout no 2?? i know the wires are diff colors, but whats the dots for??
No real need to do that....

0.20 " = 5.08 mm or 0.24 " = 6.096 mm , so I would use a 5mm or 6mm feeler to set them.
 

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Correct me if I'm wrong, but moving the coils closer to the magnets in my mind won't affect the timing. You would have to move them either up or down to alter the timing as moving the distributor on a car.
Moving the coils closer to the magnets will intensify the magnetic pulse to get a stronger signal to the ignition coils for a hotter spark.
I'm researching getting a set of Accel coils for mine that have a lot hotter spark to the plugs.
 

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magnets have their zone/range/field
as u move closer, it will enter the field earlier
not as much as moving up n down, but it will advance
 

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Crap, I WAS in 5th gear.
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500 Posts
owch... lucky i did not start her with that gap...
tomorrow i'll find an inch guage
thanks will. so my third Q is out of zone already
how bout no 2?? i know the wires are diff colors, but whats the dots for??
No need to buy a new gage set, just use the 0.5mm

0.020" = .508mm

Similarly

0.5mm = 0.019685"
 

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Ok, so this may sound like a stupid question, but I'm going to ask anyway.

Both are modified the same way, the upper (or right) hole only, or does the bottom set get modified different?
 

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..have a vulcan good day!
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Ok, so this may sound like a stupid question, but I'm going to ask anyway.

Both are modified the same way, the upper (or right) hole only, or does the bottom set get modified different?
....yes, both the same clearance

WilliamTech:smiley_th
 

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Thanks, now I just need to pick up a thickness gage.
 

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..have a vulcan good day!
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Thanks, now I just need to pick up a thickness gage.
Be aware, non metallic "Brass" gauges are expensive, I've heard Plastic gauges are available or struggle with metallic ones.

hope this helps
WilliamTech
 
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