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I use it both my 2018's YZ250 & YZ250X.
I run Bel-Ray H1-R in my chansaws and weed wacker cuz I dont have a dirt bike right now, unless you want to count my 1969 Honda CT70 ......
https://www.youtube.com/watch?v=c4J76MgdyQc
Pistons still look new when doing top ends. I've used it for 20 years without issue.
I got a 20 litre drum of 800 years ago when I was riding 2 strokes a lot, and on the label it said MX 50:1 and SX 66:1. I go with what the oil company who makes and tests the oil says their oil should be run at over a blanket statement of 32:1. And they aren't going to tell you to ruin your engine using their oil at said ratios.
Ive been racing YZ125's and YZ250's for the last decade, mostly off-road and desert.
Ive always been able to get way more hours out of my top ends and bottom ends than other people I know who race the same series I do. Your premix is one part of a multiple part equation. The ratio is just another part. Overall jetting and setup dictates your premix ratio.
I run a 50/50 mix of VP C12 and VP 100 octane unleaded, motul 800 36:1. 48 pilot, 178 main, 40 powerjet, stock needle, clip 2nd position down from the top, air screw 1.5 turns out. I usually get at least 50 hours to a top end, minimal spooge.
Pit Row
The only jetting change I made was a leaner main for my Rad Valve.
The bike is for sale in Pittsburgh if anyone is interested. It's a 2016.
Tried 927 once in the early 90s and it was the only oil that's ever caused an issue. Gummed up my rings in two rides to the point that I was losing compression. Took it apart and rings and piston were filthy dirty. There's no reason to run such a dirty burning oil when there are so many clean burning oils available. Yeah, it smells good but not worth it.
My preference is Yamalube...not too pricey, burns clean and top end wears great with it.
Honda HRC use to all but demand that it was used in their road race 2 two strokes that they sold.
Maxima's K2 was their answer to A747, as many of the teams they sponsored thought 927 ran too dirty, which castors tend to.
But, basically the most highly touted two stroke oils are the high viscosity oils and they tend to run best in the 40:1 - 50:1 range as they have about a SAE-50 rating.
Top pro level 125 mx racers should run 32:1 and 250's at 40:1.
From there the rest of us can ease off a bit. A mere 250+ cc trail rider that rarely gets above 1/2 throttle needs no more than 50:1 of a good oil like R2, 800, HP2, K2, A747, super technoplate, R50 or other high viscosity oils.
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