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Old 02-27-2013, 04:55 AM   #7
chasbmw
Beastly Adventurer
 
Joined: Feb 2006
Location: Bath Uk
Oddometer: 1,933
As it is often found with airheads, the devil is in the detail, not all of the Old style airbox covers are the same as they were altered to accommodate revised crankcase breather systems, if you get it wrong you could end up with an airbox that feeds unfiltered air to your engine.

Jim Cray's approach to improving the breathing to flat air boxes is to reduce the length of the snorkels by about 1/2 and cutting 4 x 1.5inch diameter holes in the top of the filter cover. This does require a waterproof air filter element such as a K&N.
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Charles
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R90s 1070 replica, R90/6
1971 Commando Fastback
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