****** - Verified Buyer
4.5
I am not one to write reviews but this is an oil worth commenting on .Bike:98' XR650lType: Air Cooled single cylinderMods: Piped , 10.5/1 100.5 (675cc )piston , ported, Hot Cam , FCR bored to 42.5 pumper carb , High Flow K&N oversize filter(air box removed) XR400 oil cooler , custom 1" valve cover caps(for cooling),Environment: Desert 3k' Altitude , 105+ summer temps, freeway 75~80mph , off road with loomy sandwashes etc ,etcComment / experience :I have owned XR600s & this 650 in one form or another for over 20yrs. Many claim this motor to be "bullet proof" but that is to say the same of a lawn more that produces well below its power potential. Stock power on this/these bikes is near painful and barely acceptable at best . Modifications came on to alleviate this . As a machinist I embarked on modifications that would bring this dull motor to life. A 25% power boost across the power band should prove satisfactory . 75mph , 105 degree days made for 300+ deg oil temps on short 15 mile trips . Top end Rebuilds were a 5k (or less) occurance . Good power , expensive to maintain. Installed oil cooler , oil return and feed lines were wrapped this bought oil reservoir temps down to 250 degree on 25 mile freeway jaunts. Rebuilds now at 7~10k. Cams and lifter gauling were the biggest issue. Oil temp measured on the valve train were oftentimes 250~300+ . I "inherited" a case of Max Cycle 10-40 and decided that after the last rebuild this would be the oil to test . Right away I noticed the engine felt "freer" , if that make sense. A top end inspection at 1500 miles revealed valve train components with , what seemed, no wear . With this , I decided to keep this oil as the oil of choice on this bike to continue my testing . Changes are at 2500 miles . We are currently on the back side of 4500 miles on this test . Observed Oil temps have been 210~225 on searing 105 days with 250 oil temps on sand-wash full power applications . Oil consumption has been below average and the engine seems quieter.Conclusion: This Oil is pricey but like a good steak , its worth it if its good. One rebuild will pay for several cases . More to follow . The rant is long but I tried to be as factual as possible. Hope it helps others out there with similar issues.
