NGK plugs are NOT the same . A BR8ES is NOT the same as a Rotax part number 897 055 NGK BR8ES The ones you buy from most automotive stores are Screw tips not Solid and they will wear like the pics below. Plus they are gapped at .035 and it hard to adjust down to .018.
If you buy them from ROTAX shop you will get them pre gapped at .018 and will look like THIS The problem with using screw tip NGK plugs
Go HERE to see the differnence in gapsNote the Blackened Alum tips that are showing wear on left side HERE Notice flat side on tip of plug created from Steel wire agasint alum tip . And guess what happens when the arcing starts? BOOM you can blow your resistor CAP ( 5K ohm) Where to get them? I buy all Rotax needs from
Light Engine Services Ltd.
Rotax Service Center
Aero Control Enterprises, Inc.
St. Albert, Ab. T8N 1M8
Ph: (Tech Support) 1-780-418-4164
Ph: (Order Line) 1-866-418-4164 (TOLL FREE)
NOTE : plugs Below on left are Automotive style - Screw tips and Longer electrodes - hence they hard to gap from 035 to 018
Plugs on right are From Rotax 897-055 aircraft plugs. You can only buy them from Rotax shops .
dave at cfisher.com