There is no such warning I am aware of on the Wing.
Vehicles made in the last 40 years should be fine... with that good post-1960 rubber fuel line technology.
Per seafoams head tech guy Jim D. the cleaning dose
of 2 oz per gal is the max you should use-
more does not increase its potency or speed, while less than 3/4 of an ounce per gal fuel = is less than a maintenance dose,,not really working!
1oz per gal in those semi-annual maintenance dose thru 1 or 2 tanks.
Many like to use it once a month or two = high mileage riders staying ahead of the E10 issues.
Its interesting to look inside the engine thru the spark plug holes after treatment, a clean shiny piston top
You all know our engine is an interference
type, so there are detents in the piston top for valve clearance.
If sufficient layers of carbon and E10 unburnt combustion byproduct build up and burn onto the piston, it can eventually cause its own interference
(worst case scenarios) or raise the compression enough to blow a head gasket!
Possible answer to some older bikes with mystery cause of head gasket failure? increased compression...
there has been mention of lots of scraping and cleaner required on cylinder heads that might be the reason
- for those without bad water pumps.
At minimum the crud does not allow for efficient combustion. Clean surfaces makes for a solid fuel ignition pattern.