Topic: What a stud!!

[paulages]

Cool, thanks for the replies, I was just curious, seemed odd they would just use bolts for the 650s and not the others.

i will say this: much of the 650 design was an obvious improvement from the earlier SOHC4s. the styling may have slipped a little (IMO, which is correct of course  )... but from port, clutch, and combustion chamber improvements, to a removable lower frame tube for engine R&R... there are several obvious moves forward from 1969. bear in mind the 650 had only 5 BHP less than the '69 cb750. i'd wager that the bolts rather than studs were not an accident. at the very least, they were the only SOHC studs/bolts to have a stock torque value over 20 ft/lbs.

another argument for bolts is that either will reach a permanent fatigue after several torquings. bolts would be easier to replace.

[MRieck]

Cool, thanks for the replies, I was just curious, seemed odd they would just use bolts for the 650s and not the others.

i will say this: much of the 650 design was an obvious improvement from the earlier SOHC4s. the styling may have slipped a little (IMO, which is correct of course  )... but from port, clutch, and combustion chamber improvements, to a removable lower frame tube for engine R&R... there are several obvious moves forward from 1969. bear in mind the 650 had only 5 BHP less than the '69 cb750. i'd wager that the bolts rather than studs were not an accident. at the very least, they were the only SOHC studs/bolts to have a stock torque value over 20 ft/lbs.

another argument for bolts is that either will reach a permanent fatigue after several torquings. bolts would be easier to replace.

The ports from the 650 to the 550 are light years away from each other.