JNaw
XS650 Member
Hey guys, new to the forum but have read through many many posts trying to figure this out and finally decided to just ask.
I got a 1979 xs650SE that I've modified lightly. New ignition coils, Uni pods, emgo tapered shorty exhaust, BS38 carbs original. Cafe style seat.
Went on a cruise today and I can't get the bike to go faster than 140km/h (around 6krpm) I am around 5'10 and 190lbs, not sure if that's just cause I'm a big sail or there's something else wrong. New to these bikes and understood it should hit 180?
Jetting for the carbs:
140 mains
32.5 pilots
3turns out adjustment screw
Passes slide drop test
Stock needle height (3rd clip position)
Plugs read a light tan, have yet to do a plug chop but bike does not hesitate or break up anywhere through the rev range, had the needle lowered but was weak in the midrange so brought it back to stock)
Charging at 12.9-13v at 2k rpm. 12.8 at idle)
Stock timing (yes it does go full advance @3k and above)
Unsure of compression numbers but bike has a strong compression feel with kickstart.
I got a 1979 xs650SE that I've modified lightly. New ignition coils, Uni pods, emgo tapered shorty exhaust, BS38 carbs original. Cafe style seat.
Went on a cruise today and I can't get the bike to go faster than 140km/h (around 6krpm) I am around 5'10 and 190lbs, not sure if that's just cause I'm a big sail or there's something else wrong. New to these bikes and understood it should hit 180?
Jetting for the carbs:
140 mains
32.5 pilots
3turns out adjustment screw
Passes slide drop test
Stock needle height (3rd clip position)
Plugs read a light tan, have yet to do a plug chop but bike does not hesitate or break up anywhere through the rev range, had the needle lowered but was weak in the midrange so brought it back to stock)
Charging at 12.9-13v at 2k rpm. 12.8 at idle)
Stock timing (yes it does go full advance @3k and above)
Unsure of compression numbers but bike has a strong compression feel with kickstart.
Last edited: