SQ4 rotor arm

[andrej.b]

I have a question about rotor arm. In my SQ4 I have a distributor cap 400135 and rotor arm 404923 (on the picture).
I would like to know, which rotor arm do you use on your motorcycle and how important is the shape? I was told that for distribur cap 400135 I should use rotor arm 400052. As you can see on the picture, I have to find a new one.
There are many shapes of rotor arm, like 403866, 403865... and I'm not sure which one to use.
Thanks,
Andrej

Rotor arm

[fpassmore]

Hello Andrej,

All of the Lucas information I have states the DKX4A uses the 400052 and I can confirm that all three distributors I have, one is on my '51 (40124) the other on my '56 (40486), have the 400052 rotor.

Frank

[simon.holyfield]

My '51 has a rotor arm like that 400052 as well.

[andrej.b]

Thank you for your answers, I will order 400052 rotor.

One more question, I have problems with starting the engine, but only from beggining when it's cold. When hot it starts normaly. I was told the spark is too fast, is it possible that is because of rotor arm or I have to set the distributor?

How do I do that?

[john.whiting]

A new cap might work wonders if its in the same condition as the rotor.Carbon tracking and moisture from condensation make for hard starting. I assume you have wire leads.Regards John.

[andrej.b]

Can anyone give me a suggestion, where can I find rotor arm 400052 for distributor cap DKX4A?
There is one on ebay, but the manufacturer is Bremi which is not the best choice.
Draganfly doesn't have them.

[fpassmore]

You can try this supplier http://www.gsparkplug.com/shop/lucas-dr ... 05469.html they also have the cheapest price on ebay as well.

Frank

[bob cottam]

Google "Distrubutor Doctor", they have rotor arms made,and claim to offer the quality that the cheapo imported arms cannot provide.They list a 400052, red in colour to distinguish it from the rest of the tat available.I have no experience of them,other than obtaining a quote for re-furbing my sq 4 dizzy (£180+ vat-ouch!) and no connection, but the website is interesting, Bob

[Eero.Korhonen]

Here is link:
http://www.distributordoctor.com/
Quite a website they have.
Br, Eero

[andrej.b]

I must tell you that this Red Rotor arm is the same I get from Draganfly, but it’s too small. You can see that from the picture in enclosure.
Regards,

Andrej