Oil Mixture ?

[LT250RMan]

What oil/fuel mixture is everyone running in there modded 250R's ? I just bought a 250R engine that has a 20cc cool design head on it, a boysen rad valve (looks like theres a spacer there to) and a trinity pro MX pro job and I think a 38 or 39mm air striker carb, I need to know what oil/fuel mixture I should run. This is my first TRX250R.

[bluetrx]

i know lots of guys who run 40:1 and havent known them to have any failures, but i run 37:1 just to be extra safe. they all laugh at me with my ratio-rite cup. 40:1 is really easy to mix 1 pint in 5 gal.

[Nac's22]

yea im 1 of them guys that run 40:1. it seems to be good for me. 1 friend of mine runs 40:1 with a highly modified motor, that same 1 also runs 44:1 in a different 1 that is more modified then the previous. and my other friend for some reason is running like 32:1, i guess he just likes it or something. from the factory they say run 20:1 but with the technology of todays oils you can run a little less (i read that on this site a few years ago when i was looking for an R) enjoy your new bike and welcome to the 250R family!!!!!

[brokenmike]

I run 32:1 and have no problems at all. If I foul a spark plug which I almost never do it is alot cheaper to replace a plug than a top-end

[j450rking]

i was also wondering about this. i have a 265 with stock comp and i herd that 32 to 1 is best but i it smokes a little bit more then i think it should so i think i am going to try just a tad leaner. also should i run it richer for break in?

[havinnoj]

Originally posted by j450rking
i was also wondering about this. i have a 265 with stock comp and i herd that 32 to 1 is best but i it smokes a little bit more then i think it should so i think i am going to try just a tad leaner. also should i run it richer for break in?

Run on the rich side for break in.

[j450rking]

thats what i thought. thanks

[wilbur116]

I run Redline oil at 50:1 in my 250R and 125cc dirtbikes and 60:1 in my 250 dirtbikes. Me and about ten of my friends have been running Redline for a really long time with NO oil related failures yet. NONE.

When I tear down my motors there is oil that drips off my pison still red (uncontaminated) at 60:1. I have run about every brand of oil in existence at 32:1 and never phisically seen oil on a piston at tear-down. If I swipped the piston I would see a film of black oil, but thats it.

And Redline is the only oil I've found that burns clean enough to not make my power valves stick closed on my finicky RM250.

And if you want to get all scientific, it takes energy to burn oil. So the more oil you use the more power is lost. But I would not run any other brand two stroke oil at 60:1 thats for dang sure. When my friends switched they swore they felt more and crisper power.

Another good tip is to mix your gas one gallon at a time as you use it. It's not the most convenient but it is the best for you engine. Leaving mixed gas set for long periods of time isn't a real good idea.

[wilbur116]

One more thing. New rings will not seat using Redline oil. So I use a petroleum based two stroke oil at 28:1 for break-in.

[kiesta00]

I would not recommend any oil at 50:1...A guy on planetsand's crank bearings were shot after a season and his bottom end grenaded using running that thin of an oil mixture...guess it just gets too hot with a thin layer of oil like that.

[j450rking]

yeah i wouldn't go that thin but the heat of the dunes prolly didn't help if you were on a dune forum

[wilbur116]

Originally posted by kiesta00
I would not recommend any oil at 50:1...A guy on planetsand's crank bearings were shot after a season and his bottom end grenaded using running that thin of an oil mixture...guess it just gets too hot with a thin layer of oil like that.

OK, well I thought I explained that I consistantly observe more residual oil at tear down using Redline at even 60:1 than any other oil at 32:1. And have never had an oil related failer, ever.

Go ahead and believe what you want to believe. I really don't give a rip.

[j450rking]

well if theres more residue then you should be fine

[gandgracing]

Was running Redline at 40:1 then switched to Amsoil after getting them for a sponsor and have been running the Dominator at 50:1 with no problems.

[kiesta00]

Originally posted by wilbur116
OK, well I thought I explained that I consistantly observe more residual oil at tear down using Redline at even 60:1 than any other oil at 32:1. And have never had an oil related failer, ever.

Go ahead and believe what you want to believe. I really don't give a rip.


You may have good results, I'm just stating a fact that I KNOW has happened: another member using a 50:1 ratio had catastrophic results. I'll post pictures of his 3K motor trashed when I find the pics.

All we do is dune/drag race, so thats where this experience is coming from. Drag racing probably puts more stress on parts than any other form of riding.

[j450rking]

are you talking about the same oil? if not then there is the problum. all oils are diferent as i'm sure you know and if it wasn't the same oil then there would be a totaly diferent outcome

[wilbur116]

Originally posted by j450rking
are you talking about the same oil? if not then there is the problum. all oils are diferent as i'm sure you know and if it wasn't the same oil then there would be a totaly diferent outcome

Well said.

[j450rking]

why that you. i like to try and have some sense when it comes to things like oil. like say you have some 2 stroke from family dollar or somthing and you have redline oil well redline is of course going to be way better lol (not trying to bust on anyone). and there is also diferent kinds of 2 stroke like castor based and petroleum based and theres others that i can't remember. but my point is there is alot of diferent oils and with every oil you are going to have a diferent outcome. my bro use to have a R and he ran 40 to 1 in it with bel ray synthetic nothing spectacular but it's still decent oil. now if you tred that with say yamalube regular oil well you might have a bit of a problum.

[j450rking]

SORRY FOR THE LONG POST:macho

[tg413]

I have always mixed my gas @ 1 pint to 5 gallons..We have a 94 kx 125 with the original top end in it that has used this same ratio since new and it will start right up and run all day strong.I run Klotz Benol @ the same ratio in all my 2 strokes for a few years now with great results..I would have to say that is the right mix for me, hardly ever foul a plug, actually cant remember the last one, i change them every season faithfully anyhow even if they're fine..I guess it comes down to more peace of mind than anything, amsoil did a test and ran a 2stroke on 110 or 125 to 1 to prove a point and the bike ran for quite a long time through some torture.After seeing that i would guess anything 50:1 or under is pretty damn safe.....

[tg413]

And obviously there are better oils, petroleum, synth, castor ect..I would never recommend buying ANY cheap oil for your bike.If i had an emergency and had to run cheap stuff i would run it very rich.....

[juanki]

what about maxima's castor racing oil? what is the recomended mixture? i'm still using 20:1 what sholud i use?

[j450rking]

do not run it 20to1 it's way too rich for todays oils. i am trying out the maxima castor oil and i am going to run it 36 to 1

[LT250RMan]

Well thanks for the help guys, I think I'm going to try running Amsoil Dominator or Redline at 35:1 and if thats to rich i'll try a little leaner mixture. A new plug is a alot cheaper than a topend or a crank.