Check your rubber

[Bonneville1]

If you removed your AI as most of us have then check the little rubber cap that replced the removed pipe, mine had perished after only 1 year allowing air to be sucked in and causing popping on the over run.

 

[Baltobonneville]

The Triumph stock replacement caps are more substantial. Buy a few and keep them handy. :cya:

Cover your air.

 

[drlapo]

Or link vacuum ports with rubber hoses
doesn't seem to affect performance either way, but at least they do not pop off