Upgrade to enjoy this feature!
Vital MX fantasy is free to play, but Premium users receive great benefits. Premium benefits include:
- View and download rider stats
- Pick trends
- Create a private league
- And more!
Only $10 for all 2026 SX, MX, and SMX series.
Karts run really high RPM which causes more engine heat which lowers the main way in which an oil protects, namely its viscosity. So to compensate there needs to be more oil which is why kart racers add so much oil. Look at engine oil data and note how their 100C viscosity is less than half of their 40C viscosity which means the higher the temp, the lower the viscosity. A high viscosity index (VI) means there will be less viscosity loss with high temps so racers should choose oils with a high VI.
Friction is massive drain on two stroke power. Goes against everything every respected tuner/engineer has and does say.
The Shop
DeCal Works Huge Plastic Inventory of UFO and Polisport kits.
Luxon 4-Post Bar Mounts
$189.95 - $239.95
About 95% that page of mine was quotes from other sources, just a compiling of information, and yet you say "50% was bullshit" which means you think 45% of all the decent info out there on oil is bullshit.
OK Mr Know-It-All, answer me this: How come you've never got off your ass and tried to educate the public about all the ins and outs of engine oil? Why was I left with the task? Oh so now the big man is all hot under the collar because someone with less knowledge than him steps up to the plate and attempts to help in a way no one else has up to now. So who is full of bullshit? I think you are because you've got a real shitty attitude.
Even now for some odd reason you removed your info. You are acting in a way opposite of me. I try to inform but you are one of the "oil elite" that thinks the public is too dumb to handle all your golden knowledge.
I never said I knew it all. I said that my suspicion about viscosity as the prime protective quality was confirmed by Joey Cabrera at Motul as well as a few authoritative internet quotes. And I put my theory in a spreadsheet and its results were right on or very close to the ratios different companies have recommended. read on mr knew-it-all (notice the past tense. Now you just think you know it all and get all pissy when anyone else professes to know something):
There was a thorough test of the AMSoil Saber Professional Oil and it found that the more oil that was added to the gas, the less ring wear there was for the same mileage. My calculator says it should be used at 41:1 fuel/oil ratio according to its viscosity which is the lowest ratio tested which produced the best results. Here is his results:
Before and after ring end gaps using different engine fuel/oil ratios on a 1E40QMB Air Cooled Chinese Minarelli Clone reving to 9000 RPM for 100 miles.
AMSOil Saber synthetic oil
ratio ring end gaps before and after
40:1 - .012", .015" (.003" wear)
50:1 - .019", .023" (.004" wear)
80:1 - .031", .037" (.006" wear)
Motul recommends their 800 Off Road be used at 50:1 and my calculator shows its ratio to be 51:1 for a water cooled engine reving to 12,000 RPM. I choose 12,000 for extreme use because that is what a modern 125cc revs to. And the oil manufacturers usually recommend a racing oil at a ratio that will protect an extreme motocross engine such as a 125cc.
Bel-Ray's rep emailed me that he recommends their H1-R be used at 40:1 for 125cc motocross and my calculator shows 37:1 for it.
for synthetic/mineral blends:
Golden SX2 is recommended at 32:1 and my calculator shows that same ratio for a water cooled engine up to 12000 RPM.
Golden Spectro is recommended at 42:1 and my calculator shows exactly that for a water cooled engine up to 12000 RPM.
for a mineral oil:
Spectro 2T is not advertised as a racing oil but something that can be used in oil injector systems so we can say it is for up to 10,000 RPM at the recommended ratio of 32:1 which is exactly what my calculator shows for it at 10,000 RPM.
OMG! this can't be! this "outsider" actually does know something! Call the engine oil police! He must be stopped!
This knew-it-all pissy attitude insider is the second oil insider to attack me with such an aggressive attitude. Man they really hate it for others to talk about "their" industry. (obviously an emotionally toxic industry)
Instead of attacking me and trying to make it look like I didn't hit the nail on the head (although your Dominator oil is clearly an exception with some great additives) why don't you make a web page that fills in the fine points that I am missing. I never claimed to know it all, just one important piece of the puzzle.
I'm waiting (but not with baited breath. I'll bet anyone he has more venom to spew out instead of trying to educate people. He'd much rather point out those who aren't an insider with insider knowledge.
I do appreciate you bringing up that you delved into it and got the right information and I respect you putting it up here.
Pit Row
Post a reply to: false advertising for engine oils