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Old 11-19-2009, 12:43 PM
Rockenstein Rockenstein is offline
Motorized Bicycle Elite Member
Join Date: Feb 2009
Location: Ontario, Canada
Posts: 442
Lightbulb Re: Im going to run a NGK B5HS spark plug....

IMHO a 5 is too hot with the stock timing...and I didn't like a 6 much either. I tried a 9 but it wouldn't clean itself very well on a 32:1 mix and stock timing although it remedied the indications of detonation I was hearing and seeing on the other plugs I tried. I've put about 1200k on a BPR7HIX, a 40:1 mix and slightly retarded 2110 km the plug is clean, idle is low and smooth and my GPS says I top out at 54 km/h

With regards to how I tweaked the timing...I don't use the key that fixes the magnet rotor to the crankshaft.
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