honda305 Home honda305 Auctions honda305 Gallery honda305 Forum Electronic Ignition honda305 Forum honda305 Forum honda305 Forum honda305 Racing honda305 Literature

Auctions  Mailing List    Registry   Marketplace Forum - FULL SCREEN Forum

□ Search
□ FAQ 
  □ MY_ADS
Vintage Honda Owners,
Restorers, Riders and

Correct plugs for CA77

Points Based Ignition | Electronic Ignition Upgrade
Post Reply
casamere Member
Posts: 363
Joined: Tue Nov 04, 2014 4:47 pm
Location: yorkshire UK

Correct plugs for CA77

Post by casamere » Wed Nov 28, 2018 2:18 pm

I have always fitted D8HA plugs and never had a problem but is there an alternative that people have tried. I know the answer will be stay with what you are happy with but just asking.

DJM Member
Posts: 551
Joined: Thu Oct 09, 2003 1:54 pm
Location: Chesterfield UK

CA plugs

Post by DJM » Wed Nov 28, 2018 2:41 pm

The 1963 Owners Manual quotes C7HW as being the correct plug. This is a 10mm plug and the equivalent would have been a D7HW.

Modern plugs have a wider heat range than the 1960s issue so my guess is that the heat range of the D8HA or a D8HS would overlap that of the D7HW anyway.

If it works OK don't change it.

Post Reply



CB-77 | CYP-77 | Road Test | Riding Log | Literature | Zen | Marketplace | VJ Survey | Links | Home