For
the MC16 model, use NGK B9ECS
or B9ES spark plugs.
Recommended alternative: ND W27ES-C
For
MC18 onwards, use NGK BR9ECM.
Recommended alternative: ND W27EMR-C
B9ECS
BR9ECM
Plug
gap for all types should be 0.7-0.8mm
When
using the HRC head conversion on MC21 and MC28 models,
use the HRC RS250R "shorty" spark plug
part# 31930-ND5-003
(No. 10 plug NGK# R5300A-10)
or part# 31940-ND5-003
(No. 10.5 plug) and special HRC RS250R cap part#
30700-ND5-751.
Before
fitting new spark plug cap, trim 5mm from the
end of the HT lead.
