i have Mike Terry's (Valk Bling) radiator covers on both Valks. I've had other ones too...for years (yes, OVER a decade!). No issues. In fact, when i got my first one after WWII in 1902 (ok, it was really probably 1998 in the Spring?

) ....i rode with my buddies and their stock radiator grills...and we rode in all diferent situations....out of town...in town....etc...and kept checking on several rides to see if we could see a difference when the fans kicked on for the radiator. They came on (in town....NEVER out on the road, of course)....within SECONDS of each other. IE, there is no big difference.
MANY folks have been using aftermarket radiator covers for MANY YEARS...with no issues.
this subject has come up over a decade ago...as well as stuff like "do the Kury transmission covers cause overheating?"....etc. And the answer, has always been no....no issues......
