"The pharmacy grade of castor is murder to a ringed engine or a 4stroke. Build up of varnish can lead to engine failure"


The leading cause of death in my 2 stroke engine is still human error.
I agree with you with 4 stroke engines, there are good articles out there that explain why that is.I learned the hard way(Several times).
4 stroke must only used good quality castor oir like Sig.


I have ran 10 Gal. of fuel in my St90 w/o problems. I saved Aprox. 200 Us dollar already.