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General => Douglas Motorcycles - General Discussion => Topic started by: fbjelland on 04 Jun 2021 at 07:47

Title: Spark plug 600 S6 T6
Post by: fbjelland on 04 Jun 2021 at 07:47
Hi, looking for alternative spark plugs for use in my 1930 T6, 600 side valve engine.
Any recommendations from the group?

Regards
Frode
Title: Re: Spark plug 600 S6 T6
Post by: Dads bike on 04 Jun 2021 at 19:27
Evening Frode
The pitmans book of the Douglas 5th edition states that Lodge H1 are the requirements for both the OHV and side valve engines, the 6th edition states Lodge C3 for side valve engines. I have used both these in my 1936/37 600 SV units and find starting on a hot engine is easier with the H1.
New old stock items are hard to find, so from www.gsparkplug.com a modern replacement for the Lodge H1would be
Champion K8G or NGK A4. And for the Lodge C3 from info@lsengineers.co.Uk would be Champion D14 or NGK AB6.

Good luck Steve
Title: Re: Spark plug 600 S6 T6
Post by: Hamwic on 05 Jun 2021 at 15:12
I am using three-point plugs from Accuspark

"Austin 7 AccuSpark Spark plugs AA77C, as Champion D16" available via flea bay UK.

They seem to work well in my Aero 600.

Cheers for now
Doug