My bike (and every other SM/BA) tends to backfire a bit when cranking the engine. Sometimes it pops off the caps.
I have read 3 different postings on how to make a mano. Nobody ever mentioned restrictors. ...I'm still going to get the Twinmax. It is the least expensive of the major tuners available, and virtually all BMW dealers stock it.
Speaking of.... (Off topic question) In my town the only decent New Vehicle dealership is the BMW one. Is this common in other cities? Too bad they dropped the Triumph franchise some 8 or so years ago.