Roughness Off Idle - Continued from Electrical Thread

[Steve]

Sorry for popping in a bit late, but I just saw this thread.

... -- it is really only No. 3 that is off a bit.
...

Actually, since #3 is the "master" carb, it's all the others that are off.

Can I go with a wider plug gap now I have electronic ignition?

I have not had the pleasure of playing with a Dyna system, but are you SURE you have 'electronic ignition'?

I am under the impression (and could easily be mistaken) that the Dyna system operates much like the ignitor on the newer bikes, in that it basically only replaces the points. It does nothing to enhance the size of the spark that comes from the coils, it only controls when it happens.

Someone who knows more about the Dyna, please correct me if I am wrong.

P.S. The motor idles more smoothly and at lower revs. Down to about 950 instead of the 1100 when I had points.

It's nice that it will idle that slowly, but Suzuki recommends an idle speed of about 1100 to minimize the jerky transitions on the rotating parts that happen at slower speeds. Larger engines have more flywheel effect and can idle slower, but the 550 needs to keep it up there a bit.

.

[chef1366]

Adjust the 2&3 first moving the whole timing plate and then do the 1&4 by just moving that pickup on the Dyna S.
I blew up a motor by having the 2&3 pickup too advanced.
Measure the distance between the F and advance mark on your timing (1&4) and make your own mark on the 2&3. Line the motor up to the full advance mark and move the rotor with your fingers until the plug fires when it is fully advanced.

[Suzuki_Don]

It's nice that it will idle that slowly, but Suzuki recommends an idle speed of about 1100 to minimize the jerky transitions on the rotating parts that happen at slower speeds. Larger engines have more flywheel effect and can idle slower, but the 550 needs to keep it up there a bit.

.

Steve. Point taken.

[Suzuki_Don]

Adjust the 2&3 first moving the whole timing plate and then do the 1&4 by just moving that pickup on the Dyna S.
I blew up a motor by having the 2&3 pickup too advanced.
Measure the distance between the F and advance mark on your timing (1&4) and make your own mark on the 2&3. Line the motor up to the full advance mark and move the rotor with your fingers until the plug fires when it is fully advanced.

Thanks Bill for the comments. I will make sure I do that before I take the bike out again. I checked the plugs tonight and the color looks good and there are no specks of aluminium on the insulators.

I set my timing with a timing light. I do both modules in turn with the clampy thingo on #1 and then #2 plug wires. It's running at 14deg initial so will take it back to 12deg on both sets of cylinders and see how that runs.

[pete]

So Don, can I take it you're happy with the Dynatek then?

Glad to hear you're getting it sorted too, bet it feels good!

[Suzuki_Don]

So Don, can I take it you're happy with the Dynatek then?

Glad to hear you're getting it sorted too, bet it feels good!

Pete I am REALLY happy with the Dyna S. Extra smoothness, more power and excellent starting. And it is so easy to do the timing once the timing marks have been made a bit more distinct with white paint. Easy with the modern timing lights to check if the advance/retard unit is working OK as well. Although I believe you do not have mechanical advance/retard.

I am really enjoying the bike now. It will get to a hundred easy by just going through the gears and I don't really do any more than 6k, but it seems to gets there really quickly.

When I was out on the bike the other day I took some readings of speeds in different gears at 4,000rpm. 4th was 47mph. 5th was 53mph. 6th was 57mph. And considering my motor will rev to 9,500rpm that equates to a top speed of 111mph in 4th. And my bike is geared a bit lower than a standard 650 so it should pull the revs (9,500rpm) in the higher gears (maybe not 6th), but certainly in the others.

But I am certainly enjoying riding it now. It is so smooooooooooooooooth on the road.

[Matchless]

Hi Don,
I know I am a bit late, I have ordered jets from these guys before

http://www.nichecycle.com/Items.aspx?code=MIKUNIJETS&key=cat

Maybe you know them.

[Suzuki_Don]

Hi Don,
I know I am a bit late, I have ordered jets from these guys before

http://www.nichecycle.com/Items.aspx?code=MIKUNIJETS&key=cat

Maybe you know them.

Thanks Andre, I seem to have it sorted now. A few more long rides just to make sure the jetting is correct.

[pete]

Pete I am REALLY happy with the Dyna S. Extra smoothness, more power and excellent starting. And it is so easy to do the timing once the timing marks have been made a bit more distinct with white paint. Easy with the modern timing lights to check if the advance/retard unit is working OK as well. Although I believe you do not have mechanical advance/retard.

I am really enjoying the bike now. It will get to a hundred easy by just going through the gears and I don't really do any more than 6k, but it seems to gets there really quickly.

When I was out on the bike the other day I took some readings of speeds in different gears at 4,000rpm. 4th was 47mph. 5th was 53mph. 6th was 57mph. And considering my motor will rev to 9,500rpm that equates to a top speed of 111mph in 4th. And my bike is geared a bit lower than a standard 650 so it should pull the revs (9,500rpm) in the higher gears (maybe not 6th), but certainly in the others.

But I am certainly enjoying riding it now. It is so smooooooooooooooooth on the road.

Excellent Don! Very glad to hear your persistence has paid off!

Now I'm gonna havta get my jetting spot on when I get to that point... you've inspired me

Hi Don,
I know I am a bit late, I have ordered jets from these guys before

http://www.nichecycle.com/Items.aspx?code=MIKUNIJETS&key=cat

Maybe you know them.

Good link Andre! Those jets are a great price, will keep them in mind when I'm at the stage Don was...

[Suzuki_Don]

Pete, I will be watching your thread for the jetting procedure that you will use. You will have to get it on the road first though, as it's hard to do the jet testing by running the bike in the shed. A few miles on the tarmac can tell you a lot.

[pete]

Pete, I will be watching your thread for the jetting procedure that you will use. You will have to get it on the road first though, as it's hard to do the jet testing by running the bike in the shed. A few miles on the tarmac can tell you a lot.

That point is getting closer every day, just uploading pic's and vid's from today's fun actually...

I tell ya Don, I'm getting quite antsy because the light at the end of the tunnel is glowing brighter...

[Suzuki_Don]

Another UPDATE:

Yesterday (Sunday) I removed the ignition cover, loosened the 3 screws holding the Dyna S modules base plate and retarded the ignition on both sets of cylinders by a couple of degrees. Took it for a ride so it was fully warmed up. Put it back in the shed, threw the timing light on it, doing 1-4 and 2-3 in turn and both sets were exactly the same on around 11 or 12 deg initial advance. Have not checked for pinging yet, that will take a longer ride under different conditions.

[Suzuki_Don]

UPDATE: I took the bike for a three day run and it was running quite well, although it is still pinging a bit at low revs when opening the throttle. I need to retard the Dyna a bit more.

I think it is set at 12 deg initial advance at idle, and I think it should be 10 deg as on the 650 motors.

The quandary I am in is that the 650 handbook states that total advance is 40 deg for that motor. I have 550 bottom end, 650 top end. So it should be timed to the 650 specs IMO. The 550 advance unit which I am using operates at 17 deg initial at idle and 37 deg total advance.

So if I retard the Dyna base plate to get the 10 deg initial advance at idle, that means the total advance is being retarded by 7 deg as well, which would give me a total advance of only 30 deg.

Which I am worried will damage the motor at higher revs.

COMMENTS PLEASE - advice even.

Also see below a couple of the plugs I pulled from my motor after the three day run - What do you think of their colour. Particularly the black soot around the threaded base of the plug. And how do the centre and side electrodes look.





Thanks in advance.

[pete]

Don, is the Dyna S fully electronic or does it still use the mechanical advance like mine?

If it uses the mechanical advance, can you not use the weights from a 650?

Alternatively, the 80 - 82 450's have similar sounding timing with the 10/40 setup, so maybe some weights from one of those will fit?

Of course I'm probably barking up the wrong creek altogether but it might be worth a thought...

[Nessism]

Don,
Retarding the ignition at idle will retard at high rpm's as well. Only down side is loss of power and economy.

Might be time to play with the weights and springs between the two advancers so you can get an optimal set up.

BTW, those plugs look good to me.