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Location:
Brisbane
Registered:
February 2003
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Re: 18R - what's this?
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Sun, 29 August 2004 13:08
 
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i think that hole is in the 18RC heads only - earlier 18R only used used exhaust gases to heat the choke up and heat the manifold 'plenum' under the carbi.
mine has this hole blocked up with a threaded rod with hex socket pressed into it. once attached, it has been ignored ever since.
it originally went to an EGR valve mounted on the manifold, or if you were really lucky, to egr valve attached to a flange below the carb.
18RC only major improvement was a better upper cam chain tensioner (spring plus oil pressure instead of just a spring) ... i think. heads are similar - maybe compression is different for the emissions model.
advice: find any bolt that fits it, attach said bolt, then forget.
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