Which dyna s i need? Gs550

[vaggmak]

Hi here is my gs550. I want to put dyna s but i don't know whick one ds3-1 or ds3-2

[vaggmak]

And here my gs550 Screenshot_20211021_190625.jpg

[ajh]

Ive spent a lot of time trying to understand same thing. Been in contact with Dynatek and givent them photos and measurements and the outcome is they cannot be 100% unless ND is stamped on the advance rotor. The differences are around the height of the points cam, mine 'looks' the same as your pic and they have made a highly educated guess the ds3-1 is the one based on measuring the depth of the cam. Heres the email I got from them -

On the height of the points cam lobe, which you show as 27.95 MM. or 1.100", the DS3-1 rotor height measures at 1.095" so I might suspect that the DS3-1 kit is the best option.
The DS3-2 rotor is taller than the points cam lobe by .030" and I must suspect will not fit.
Remember, this is till somewhat speculative, but I believe the DS3-1 would be the ignition to use.

hope it helps