If it doesn’t work out with the radiator, I swear by Alumaseal sealer. It’s powder form, comes in a tube. Put about 1/2 the tube in for the smaller system. I’ve used it on cars and bikes since the mid 80’s with no apparent ill affect.
The latest is in my Goldwing 1100. 2 leaks in the core. It has stayed sealed thru a couple flushes and antifreeze refresh, and pressure tested to 25 lbs.
2016 KLR 650
2017 BMW S1000RR (traded in for
2018 Ducati V4S
1983 GL1100 Goldwing
2017 Yamaha R1
Last edited by dan filipi; 08-25-2018 at 10:40 AM.