Set of 2 reproduction rubber intake insulators / rubber intake manifolds / carb holders for the Honda CM400/450 and CB450SC twins from the early 80's. If you've discovered cracks on your stock intake boots, it's time to replace them because they're most likely leaking air which leans out your air/fuel mixture. A quick way to check is to spray something non flammable on the boots with the engine running, if you hear a change in RPM, they are leaking for sure!
Honda part number (o-ring): 91325-413-830 - Qty. 2
Honda part number (insulator): 16211-447-670 - Qty. 2
I.D where carburetors mount: 43mm
I.D engine side: 33mm
Mounting hole spacing (measured center to center): 67mm
All models listed use 2 insulators. The left and right insulators are the same.
CM400C Custom - 1981
CM400E - 1980-1981
CM400T - 1980-1981
CB450SC Nighthawk - 1982-1986
CM450C Custom - 1982
CM450E - 1982-1983