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pkrpkr's picture
VBMWMO #9256
Joined: 06/25/2016
Posts: 2

Anyone have some directions for what is a good spark for a D2B RS172 Bosch magneto in an R12? Reason to ask is that starting is difficult because I can't kick hard enough - the new pistons have much more compression than the worn out old ones Smile
At 50 revs/min at the magneto, the spark can bridge about 2mm, at 100 revs/min at the magneto spark can bridge 7-8mm in open air. Is that good enough?
PS bike runs fine at idle once it's started