The TX650 has two oil filters, one mounted in the sump, the other in the right side engine cover. Neither are really filters, more like strainers. The sump filter is a weak spot in the lube system and has a habit of self destructing along one side where Yamaha, in its infinite wisdom, decided to use a straight section of filter screening, the remainder of the screening is concertinad, thus giving it better durability. The lube system is low pressure high volume due to roller bearing big ends. So, I decided to modify the system, to give better longevity and improve filtering.
First off, I made a guard that covers the flat screen section of the sump filter, thus protecting it and stopping it from tearing. I suspect the problem is probably related to the higher viscoity of the oil when cold, the oil presure is only around 10 -15psi on starting, dropping to around 4-5psi when warm, so pressure certainly isn't the issue. That done I moved onto the the right side filter/strainer.
First off, I made a guard that covers the flat screen section of the sump filter, thus protecting it and stopping it from tearing. I suspect the problem is probably related to the higher viscoity of the oil when cold, the oil presure is only around 10 -15psi on starting, dropping to around 4-5psi when warm, so pressure certainly isn't the issue. That done I moved onto the the right side filter/strainer.