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Royal Enfield 2012 twin spark
Posted: Sun Nov 06, 2016 5:09 pm
by Jan B
I have an Enfield 2012 EFI C5 classic army. Now I noticed that my engine has two spark plugs but only one is connected. If I look on internet for specs, I find both versions for RE EFI C5 2012: single spark plug and twin versions. I can aswell drive on one spark plug, but I think it needs different ignition settings for single and twin spark plugs, right?
Does somebody now what is standard: twin or single spark plugs and what about ignition settings?
regards
Royal Enfield 2012 twin spark
Posted: Sun Nov 06, 2016 10:52 pm
by Tim NZ
Different Ignition curve for the Twin Spark. The VIN number will enable the eng to be ID'd then you will know for certain if something has been altered...
Royal Enfield 2012 twin spark
Posted: Mon Nov 07, 2016 2:43 pm
by ric
Throwing a thought to the wind..
you either have a standard single plug head someone has fitted a second plug but not taken the conversion to its full conclusion by adding a coil etc. or perhaps fitted a push button decompressor and swapped it out for a plug prior to sale... or has fitted a home market head which does have two plugs to presumably what is an export market bike.
Royal Enfield 2012 twin spark
Posted: Mon Nov 07, 2016 2:43 pm
by ric
Throwing a thought to the wind..
you either have a standard single plug head someone has fitted a second plug but not taken the conversion to its full conclusion by adding a coil etc. or perhaps fitted a push button decompressor and swapped it out for a plug prior to sale... or has fitted a home market head which does have two plugs to presumably what is an export market bike.
Royal Enfield 2012 twin sp
Posted: Mon Nov 07, 2016 2:44 pm
by ric
Oops, Two replies, one for each plug hole
Royal Enfield 2012 twin spark
Posted: Sat Nov 12, 2016 11:19 am
by jefrs
If the bike is an export EFI C5 then the ECU should have an 'export' label and the ignition is single spark.
The domestic indian 500 (EFI) does have Twinspark. If Twinspark then the plugs should likely be NGK BPR5ES & CPR7EA-9 (maybe 350?), the second plug having (NB) smaller diameter. To make Twinspark work then you need one of the domestic indian ignition systems or an after market system, most of which won't marry the ECU of the EFI. So far as I can tell, the only reason for Twinspark is to let the bike run on very low quality fuel.
Another difference of domestic v export seems to be 'electronic fuel injection' v 'Keihin electronic fuel injection'