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Old 05-07-2012, 08:55 AM
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breno breno is offline
Motorized Bicycle Elite Member
Join Date: Aug 2010
Location: Syd. OZ
Posts: 411
Default Re: BP6HS spark plug clearance issue?

both my old bikes ran this size plug.
I had also lapped both heads down to raise comp.
This was on a grubbee 70cc they did clear but mind you it was bloody close.
Like OP said, check the gap before install. Fit plug and turn the motor over via the 14mm nut behind the magneto cover a couple of rotations. If it gets stuck part the way thru you know it hits.
Just keep in mind though when you thrashing the ass out of it that the piston may have the ability to creep a tad higher than in the barrel and could possibly knick the plug.

I dont think you'll have any dramas though dude.. go for it!
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