I have a 2014 KLR 650, it seems to run too cold all the time. Instead of installing the Thermo-Bob kit, why can't I replace the existing thermostat with one that opens at a higher temperature?
glasair, while I see no problem with the temperature parameters chosen by the Kawasaki Heavy Industries engineer, myself . . . I happen to have a high-temperature (same as Thermo-Bob's) thermostat (new, never installed).
I've offered the part on this website, but . . . Thermo-Bob fans ran, screaming, from the room!
I'm likely considered guilty of the crime of, "engine abuse," inflicting the alleged punishments of: Thermal cycling, thermal shock, excessively cold operation, and probably, some too fierce to mention.
If you'd like to experiment with this component, please send me a private message.
The relief hole or air bleed hole in the 90C thermostat is about 3-4 times too small to allow proper operation in the non-bypass standard cooling system.
Too small of vent hole will drasticly Increase the delta T between coolant temps entering the base of the cylinder during the first 10 - 20 minutes of operation of Every start-up cycle, dependant on ambient air temp.
Too large of vent hole will lengthen warm-up time, inspite of being a hotter set point.
If either of you would care to copy the "vent slot" of the oem thermostat into the upper edge of the 90C thermostat it could be used and has been used by a few individuals, but it is still NOT Recommended practice.
Why mess with success? Wattman did all the experimenting for us and invented the Thermo-Bob.