Your a man after my own heart CJ . I,am a little long in the tooth , spent the majority of my early teens in the Amateur Class , racing air cooled MX & Enduro's in the summer & Super stock & Factory Mod sleds in the winter in the late 60's to early 70's . Eventually dropped the cycle competition to devote more time to the sled racing dynamics , Oval Sprint / Enduro - Cross Country / Drag . The 70's were quite a turbulent & exciting time in 2 cycle oil & engine design . Air cooled engines were refined into multi cylinder applications until horsepower levels peaked to a critical path , requiring more consistent temperature control to achieve anymore reliable horsepower , liquid cooling was engineered into the mix . I did quite well as an independent racer of Arctic Cat & Yamaha , so well that in 1975 the local distributor for Polaris approached me with a full sponsorship . I agreed and spent 2 yrs travelling throughout North America Competing , Kawartha Cup in Peterborough Ontario for our National Championships , Eagle River Wisconsin for USSRA Championship , along with stops various other International Series Sprint & Endurance Race Series . Initially Quaker State & Shell were the Primary Series Oil Sponsors with Bel-Ray , Opti2 & Klotz as Associate Series Sponsors . I have used all above noted Oil Manufacturer products with great success in both Cycles & Sleds . Usually in Premix ratios of 40:1 in the MX Class Cycles & Air Cooled Class Sleds & 50:1 in the Enduro Class Cycles & Liquid Cooled Sleds . Also within saws at the same ratios but not the same predictable results ! lol. Later on the Oil technology again fell behind , when the Higher horsepower sleds needed more refined protection than the current Mineral based oils could deliver . Thus the niche was made for Blended Castor based oils in the 80' s , these blended castor oils allowed maximum engine failure protection , with reasonable teardown schedules for carbon fouling prevention . I did well enough eventually to achieve a full independent factory ride , a 650 TX Starfire Centurian Triple Free-air with Polaris for the 1978/79 season . Bob Eastman & Leroy Linblad had retired from active drivers , & Steve Thorson , Jerry Bunke & Brad Hulings from Mercury fame were hired on . Bob & Leroy continued on as Race Directors & Engineers respectively . I learned a lot from Leroy on chassis & suspension / track set up . Bob was great at Engine Design & Reliability Testing Protocols . I really was impressed with their devotion to oil testing perimeters , that I expanded it to my cycles in the off season . Anyhow your testimonials within your engine manufacturers & oil applications rings true to fact . I fondly recall my days in the sun with my 1970 Hondaka Super Rat , 1971 KX-350 Big-horn , 1972 Cz-250 MX & later 1977 Husky-390 & 1978 Can-Am 370 qualifier , which actually still own . I currently have run Dominator in the Can-Am , switched to Interceptor in Sept. My current 2 sleds Polaris 700 SKS Trail Sled with a reworked Liberty Engine sans power valves , have ran it at 50:1 with Interceptor or with 100:1 Saber premix added during injector system use . My other sled is a Polaris 850 Patriot RMK Mountain Sled with power valves , both sleds have numerous performance hours with no issues . Thanks for your input I concurr with your rational & findings brother & the memories !
. P.S. R.I.P. Jim Adema , a personal friend from Belmont Michigan , who taught me porting 101 a fellow independent racer , Snow-Jet "Thunder-Jet pilot , until his death at Ironwood Michigan in 1975 , incredible engineer & human being