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Serious Thumper 2005 No Login
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Professional "scooter trash".
Posts: 5207
Rosemark TN
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Too tight puts tension on the trans output shaft, gets it slightly out of square, lets gears make contact even with the clutch in or the bike in neutral. The vibration/sound from the contact, however slight, can be transmitted through the clutch basket (which is tied into the input shaft and therefor the gears).
Confused yet? Unit construction bikes like most metrics and all Sportsters are kind of, um, odd... compared to a car/truck transmission or pre-unit motorcycles (Big Twins, early 60s and older British, Indians)... but still less finicky about how they are set up. Try to tighten the primary chain on an OLD bike, loosen a bunch of bolts, slide trans back and tighten the bolts, then reset your drivechain tension, all while keeping the primary sprocket, countershaft sprocket, and driven sprocket in perfect alignment... triple row primary chains aren't cheap.
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