Funny that you should ask. I just put a pair on last night. I have an issue with not being able to get enough slack/free play in the cable but it's very close. I've adjusted the cable all the way in at the carb and throttle housing but still no free play. I'm going to machine down the lock nut at the throttle housing by a few mm and then it should be fine. I also put a 41mm carb on awhile back and I recall that tired me to loosen the cable a bit too so perhaps with the 39mm carb the throttle side would be no issue.