You went from 180 main jets to 300 jets. That's quite a change. Original sizing for the Hornet carbs is 270 on the mains and the needle in position 4. So, you are not overly fat yet on fuel in the upper throttle positions. Kinda depends on what fuel you are running, what elevation you ride at, and what final drive sprocket you have on.

Also, having both air cleaners on, or the same of whatever for both sides is important to tuning.

Both Hornets and the Wasp here really come alive when they get up on the cam at over 4,000 RPM. They can pull the front wheel off of the pavement with not much effort.

As you know, do not load it up on the hills. Drop down a gear. Working it hard on the hills and getting pinging is a disaster in the making.


1967 BSA Wasp
1967 BSA Hornet (West Coast Model)
1967 BSA Hornet (East Coast Model)
1968 BSA Firebird Scrambler
1968 BSA Spitfire Mark IV
1965 Cyclone Competition Build