When I was working at Suzuki dealers we used to re-profile the reed stops to a (I think, can't remember) 8" or 10" diameter and about 50% more 'lift'.(just about touching case radius) o need to polish contact area with at least 600 grit afterwards. Make sure angle of port and reed block all match up. PE175 was first bike I ever managed a 'tail whip' on, my Yamaha 400 was way too heavy to learn on (plus I broke rear suspension trying ;D ) I don't like thinking about it too much though, makes me feel real old (almost 40 yrs ago
)