Author Topic: 1989 FXR timing with VOSE or not?  (Read 367 times)

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Offline 1340evo

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1989 FXR timing with VOSE or not?
« on: August 30, 2020, 07:39:27 AM »
Just checking my timing. I think my VOSE may be playing up a bit, sometimes working, sometimes not.

Question is, when using a dial back strobe, do I keep the VOSE in the circuit, or take it out?... I have read somewheer that you disconnect the VOSE when timing but trying it both ways, im getting 18.5 deg with it out and 27 deg with it in.. so they don't read the same?

Anyway, on full advance (in or out) should I be more like 35 deg?

Thanks
« Last Edit: August 30, 2020, 07:45:28 AM by 1340evo »

Offline 1340evo

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Re: 1989 FXR timing with VOSE or not?
« Reply #1 on: August 30, 2020, 07:45:04 AM »
 :crook:

Offline turboprop

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Re: 1989 FXR timing with VOSE or not?
« Reply #2 on: August 30, 2020, 08:58:00 AM »
Just checking my timing. I think my VOSE may be playing up a bit, sometimes working, sometimes not.

Question is, when using a dial back strobe, do I keep the VOSE in the circuit, or take it out?... I have read somewheer that you disconnect the VOSE when timing but trying it both ways, im getting 18.5 deg with it out and 27 deg with it in.. so they don't read the same?

Anyway, on full advance (in or out) should I be more like 35 deg?

Thanks

When using a dial back light to set timing on an engine equipped with a VOES the lead that comes from the ignition module must be grounded. Set the timing to the full advance of your choosing using the TDC mark on the wheels and the dial back capability of the light.

A less messy alternative is to index the rotor (charging system) and use it the same way that the TDC mark on the wheels would be used.
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Offline Burnout

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Re: 1989 FXR timing with VOSE or not?
« Reply #3 on: August 30, 2020, 09:05:26 AM »
A dial back light will not work well with a dual fire ignition.
The uneven firing will confuse the light.
They don't call me Ironhead Rick just because I'm "hard headed"

Offline 1340evo

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Re: 1989 FXR timing with VOSE or not?
« Reply #4 on: August 30, 2020, 10:32:20 AM »
Just checking my timing. I think my VOSE may be playing up a bit, sometimes working, sometimes not.

Question is, when using a dial back strobe, do I keep the VOSE in the circuit, or take it out?... I have read somewheer that you disconnect the VOSE when timing but trying it both ways, im getting 18.5 deg with it out and 27 deg with it in.. so they don't read the same?

Anyway, on full advance (in or out) should I be more like 35 deg?

Thanks

When using a dial back light to set timing on an engine equipped with a VOES the lead that comes from the ignition module must be grounded. Set the timing to the full advance of your choosing using the TDC mark on the wheels and the dial back capability of the light.

A less messy alternative is to index the rotor (charging system) and use it the same way that the TDC mark on the wheels would be used.

Have linked past the VOES by joining both wires together... So is it 35 deg?

I have already marked it inside the primary and drained it of oil ;)

I does not appear to confuse it, but it is a bit out to static timing??

Offline turboprop

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Re: 1989 FXR timing with VOSE or not?
« Reply #5 on: August 30, 2020, 11:11:54 AM »
Just checking my timing. I think my VOSE may be playing up a bit, sometimes working, sometimes not.

Question is, when using a dial back strobe, do I keep the VOSE in the circuit, or take it out?... I have read somewheer that you disconnect the VOSE when timing but trying it both ways, im getting 18.5 deg with it out and 27 deg with it in.. so they don't read the same?

Anyway, on full advance (in or out) should I be more like 35 deg?

Thanks

When using a dial back light to set timing on an engine equipped with a VOES the lead that comes from the ignition module must be grounded. Set the timing to the full advance of your choosing using the TDC mark on the wheels and the dial back capability of the light.

A less messy alternative is to index the rotor (charging system) and use it the same way that the TDC mark on the wheels would be used.

Have linked past the VOES by joining both wires together... So is it 35 deg?

I have already marked it inside the primary and drained it of oil ;)

I does not appear to confuse it, but it is a bit out to static timing??

Factory spec for all evo engines is 35 degrees. A modified engine will probably be happier with less timing.

Not sure what you are asking about static timing.
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Offline 1340evo

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Re: 1989 FXR timing with VOSE or not?
« Reply #6 on: August 30, 2020, 11:46:43 AM »
Just saying its quite away off from my static setting.

Actualy, just thinking about what I've just done, (set to 34).. but it didn't appear to be far off this just abouve tickover with everything linked out

Is that right or should you see the mark climb into position as the reves go up??.. 

Offline Deye76

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Re: 1989 FXR timing with VOSE or not?
« Reply #7 on: August 30, 2020, 04:29:24 PM »
"A modified engine will probably be happier with less timing.'

What S&S advised when I ran their Hot Setup in a FXR back in the 90's. 30, suggested by them worked very good.
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Offline turboprop

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Re: 1989 FXR timing with VOSE or not?
« Reply #8 on: August 30, 2020, 06:25:41 PM »
Just saying its quite away off from my static setting.

Actually, just thinking about what I've just done, (set to 34).. but it didn't appear to be far off this just above tickover with everything linked out

Is that right or should you see the mark climb into position as the reves go up??..

The timing will steady increase from idle until whatever rpm the full advance curve peaks at. This can vary with the ignition module and what it is set to. A good procedure is to simply hold the light on the marks and increase the rpm until it stops advancing. Whatever rpm that occurs at, go a little higher just to be sure. This is the rpm at which the timing is set with the VOES lead to ground. Be sure to reconnect the VOES once the timing is set.
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Offline 1340evo

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Re: 1989 FXR timing with VOSE or not?
« Reply #9 on: August 31, 2020, 01:19:19 AM »
I will have to re-check at some point, I understand what you are saying, have the light on 35 deg and bring up the revs. Thats what I did but it appeared on 34 deg more or less straight away.
Its the std HD box im running....
Will have another look.. that said, I went for a ride and it all worked well?...

as its set on 34 it does not back fire as much on overun, but does vibe a bit more
27 as I had it before back fired on overun a bit more, less vibes, and maybe just not a keen to get to the red line.

I'm assuming its a very soft red line, like its run out of gas type feeling. I know with my R1 it's like you could go over the bars it stops that quick.


« Last Edit: August 31, 2020, 01:26:34 AM by 1340evo »

Offline nmainehunter

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Re: 1989 FXR timing with VOSE or not?
« Reply #10 on: September 05, 2020, 06:54:04 AM »
I've never quite understood the reason to ground the Voes. My understanding of the switch is that it controls the timing through vacuum. It may advance the ignition earlier but if you have the dial back set to 35* and the revs are up to what normally is full advance at 35* the full advance mark will be in the window. I do mine this way and it jives with the static timing.I have a 2000P ignition.