Re: CB650 SC Oil Cooler for CB750's

Posted by sgtslag on Apr 17, 2012; 5:47pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/CB650-SC-Oil-Cooler-for-CB750-s-tp3909678p3917981.html

If the adapter, with the hoses attached, is the same OD as the filter housing on the 750, yes, they will swap, and seal properly.  As long as they are the same diameter (both OD, and ID), on the adapter plate, and the filter housing, they will mate, and seal.

Check the center hole on the adpater, also.  The front and back of the adapter plate need to be sealed from each other, or oil will not flow through the Radiator.  I could not tell if the CB650 SC used a different Oil Filter Boss, or not.

[EDIT (06-27-12):  There is a hole in the adapter plate; this will allow only some, not all, of the oil to circulate through the radiator, while the rest goes to the filter, un-cooled; I suspect it also lowers the pressure within the radiator, but I could be wrong.]  This 7-row Radiator will shed a lot of heat.  Try it for a while, and see how your oil temperatures run.  If it takes a very long time to warm it up to 180 F (minimum operating temperature at which the oil will begin to suspend crud within itself, to be captured by the filter), you may want to install an oil thermostat, which will bypass the Radiator until the oil reaches 180 F.  I used the Perma-Cool thermostat (20 GPM flow rate; will withstand up to 200 PSI; available on e-Bay, for $59 + $9 S/H:  auction link.  Keep us posted.  Cheers!