| On your 620 the clip on bars are mounted above the top yoke as on my 900ssie.
Red-duc is talking about the earlier ss carb bikes like my 583 race bike which have the clip ons below the top yoke so these can be slid up and down the fork legs to some degree.
The 620 bars have a higher down angle than the carb bike bars. The whole riding posistion of the injected bikes is more aggressive. The carb bars are very tame and did not feel at all sporty.
For my race bike i ended up with a very low seat height in direct opposite to everyone else in the paddock,but with higher footpegs and standard carb bars cut and shut to the same angle as injected bars. This throws me along way forward and i run them fairly wide for leverage. It is however pretty bleeding uncomfortable for any length of time over your average race/track session. It does appear to work though, and you have less distance to fall when you fall off!
The 900 road bike feels like a limo afterwards. Wrist ache sets in after about a hour but you soon get use to it.I have ridden 1500 mile in 4 days on it without much problem so give it a bit of time before altering anything.
Some of the 620 race boys have tried moving the standard bars below the top yoke but i am not sure how that would feel but would certainly not help your back.  | 
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