Looking for an external oil cooler for a 82 CB750K

[cde70]

I am looking to get an external oil cooler for my 82 CB750K.  I am looking for something that is a bolt on application.  A friend told me I should be able to get one on ebay for an early to mid 80's 650SC and it should bolt right on.  Has anyone done this or knows how this could be done without costing me an arm and a leg.  Thanks,  Curt

[sgtslag]

Kurt, I found an adapter for the engine's oil filter housing, which had ports for hoses to be run to a cooler.  I assembled my oil cooler from parts, making my own design, basically.  I found a couple of bolt-on sets on e-Bay, very rarely, over the past three years.  They typically sold for $100+, and all were used!

My cooler system consists of the following parts:

*Spin-on filter adapter housing, with cooler hose ports;

*Plumbing Shop brass hose barbs:  2-90-degree hose barbs for the adapter; four straight hose barbs for the Thermostat

*T-bolt Hose Clamps x 6 (worm-drive hose clamps weren't strong enough -- oil shot out past them!)

*CB900 Oil Radiator (had to hack off the hoses to mate them to the system)

*Perma-Cool Oil Thermostat

*Oil Filter Cover, metal (protects the spin-on filter from rock impacts -- it sits immediately behind the front wheel)

*High Pressure Oil Hose, 3-feet

*Aluminum bar stock (fabricated into a mounting bracket)

*U-Bolts x 2 (used to mount the aluminum bracket to the bike's frame)

*Misc. Bolts and Lock Nuts (secure the radiator to the bracket; secure the U-bolts to the frame)

*Oil Temperature Gauge with Sending Unit (electrical, or mechanical, either works)


After installing my system, I have logged over 2,000 miles on the bike.  It dropped the oil temperature coming out of the engine, riding two-up with luggage, from 250 F, to 190-210 F, with an ambient temperature in the mid-80's!  The only issue I have found, is that the radiator needs to be covered when the air temperature drops below 60 F:  the thermostat sends 10% of the oil up to the radiator, even when the oil is cold, to prevent thermal shock, pressure loss, and foaming.

Let me know if you need any additional information.  Cheers!