Dynatek S Issue

[MikeinSaudi]

Hi everyone,

I have had a trawl but no one else seems to have had this problem (but usual apologies if this has been raised before).

Dynatek S by Mike Balmer, on Flickr

Dynatek S 3 by Mike Balmer, on Flickr

The photos above show the Dyna S unit i have installed in my 1978 GS550e. Having installed it and tightened the bolt that goes through the centre, with the recessed nut, the timing rotator can't rotate as the bolt and nut hold it tight - clearly the bike wouldn't start. To get the rotor to rotate i had to slacken off the bolt sufficiently to 'finger tight" which to me does not seem safe. Once it do this then the bike runs fine.

Has anyone else had this issue and if so how have you overcome it?

As ever, thanks in advance guys

Mike

[zed1015]

Never seen that issue except when one or both of the bob weights aren't in the slots of the rotor which will hold the rotor off it's correct position on the advancer .
If that is not the case the fault may be a rogue or incorrectly supplied rotor and then a few mill skimmed of its outer face would get the end clearance but from the many Dyna's i've fitted there has never been a manufacturing fault of the rotors.

[GregT]

I've seen it once. Corrected by machining enough off the rotor to get endfloat.

Looking at what was on that engine, I thought at the time the unit had come off the crank in use and had needed cleaning up to be reused.
Thus losing a tad of length.

[Nessism]

I had a similar issue on a 1979 550E. Can't remember what I did to fix it but seem to remember adding a washer or shaving the rotor. Something like that.

[salty_monk]

I seem to remember there being something weird about the 550 with Dyna S's... think there are 2 versions. Add a washer would be my fix.

[MikeinSaudi]

Guys thanks for coming back to me.

I had thought about adding a washer or shaving/ skimming the rotor but i contacted Dynatek and the supplier (Grumpy1260 here in the UK). Scott Valentine at Dynatek got back to me straight away and we swopped a few emails until he recognised that i had been supplied with a DS3-2 unit when i need a DS3-1 (the earlier model).

When i did manage to speak to Grumpy 1260, the guy there was really helpful and knowledgable about Suzukis and the GS in particular. He said that a very small number of the early models had a difference set of points and therefore needed the DS3-1.

Like some of you above i had thought of taking a bit off the rotor but my first inclination is that i shouldn't mess about with something that 'should' work. When i couldn't see anyone else experiencing the same problem i thought i should ask both here and at Dynatek so that best case i could share the fix with the community.

So a few more days waiting for the part to be swopped out and then re-fit.

Thanks, as ever, for taking the time to reply guys.

Mike

[Tom R]

My experience with dynatek customer service has been great as well.... very knowledgeable about their products.
I’m guessing the difference between the two is the length of the rotor. They’re easy enough to shave down at home as long as the slots for the advanced weights are deep enough... even that can be fixed with a file.

[chris]

Hi, sorry for my ignorance, but I did not know that the Dyna S requires the use of the stock mechanical advance ? I guess it would also require the use of the original transistor igniter on later bikes like my 83 1100e. Is it just a trigger assembly replacing original points ?

[Nessism]

Hi, sorry for my ignorance, but I did not know that the Dyna S requires the use of the stock mechanical advance ? I guess it would also require the use of the original transistor igniter on later bikes like my 83 1100e. Is it just a trigger assembly replacing original points ?

The installation instruction are available on the Dyna website.

The Dyna S requires a centrifugal advance unit. Any existing ignitor units need to be removed or at least disabled since they won't be functional.

[zed1015]

Hi, sorry for my ignorance, but I did not know that the Dyna S requires the use of the stock mechanical advance ? I guess it would also require the use of the original transistor igniter on later bikes like my 83 1100e. Is it just a trigger assembly replacing original points ?

The Dyna 'S' uses the original mech advancer but the DYNA 2000 does not.
The 'S' is a stand alone system that does not have an ignitor. It simply replaces points and has a magnetic rotor instead of the points cam.
The 2000 has a fixed rotor with the advance curve taken care of by it's own ignition module which also has facility for rev limiting and alternative ignition curves etc.
If using the 'S on a later factory electronic ignition you would not use the original ignitor but would have to use a mech advancer if fitted or retro fit one from an earlier bike if not.