125-200cc Looking for a simple oil/gas ratio

I've done a recent top end. Re packed the exhaust. The bike is all stock and gets trail ride mainly. 2002 wr 125. I ride from 100-800 elevation and it has stock settings in the carb..

Main jet-400
Jet needle groove -3rd
Jet needle-6dj8-60
Pilot jet-35
Idle air screw 1-1/2
Slide-3.0

My question is the manual says 33:1 but I've read a lot about doing 40:1. I'm still getting a little oil residue out of the pipe at 40:1. Should I stick with stock 33:1. Or do 40:1? And is 40:1 leaner then 33:1? Looking for a basic/easy answer without changing my jetting all around. Thank you

Oil residue out of the pipe indicates being too rich, but you didnt mention if it was stuttering or bogging at certain throttle positions, so we don't know where you need to start re-jetting. Just based on reading, and my own experience, usually you have to go leaner on the pilot.

Side note - it's usually not advisable to fix jetting issues by changing your pre-mix ratio. Choose a ratio and then re-jet to that ratio you've chosen. You can make 32:1 (or 33:1 as the manual suggests) work without getting oil residue from the exhaust.

So if going leaner on pilot jet would be dropping it to 32.5? Or 30? And only time it feels it loses power Is at 1/4-1/2 throttle I would say. And just out of curiosity , is 33:1 richer or leaner then say 50:1. Thank you for your reply!

Some oil out of the pipe is normal (spooge). If it is running good ride it. Don't change the jetting or the oil ratio to influence spooge. Some mix oils have a higher flashpoint and will spooge more because the mix oil won't get completely burned especially when putting around. A good example of this is Ammsoil Dominator has a 10 degree higher flashpoint than Ammsoil Interceptor. Both are excellent oils but made for slightly different uses. (Interceptor will spooge less)

Set your air screw properly first, and go from there. There's plenty of info online for how to do this.

33:1 is leaner than 50:1. more oil means less gas, less gas means more air per unit of gas = leaner.

1/4 to 1/2 throttle is your needle adjustment
not to oversimplify jetting but if it sounds like it wants to just rev you are too lean if it sounds like it's burbling you are too rich
happy is when it revs quick but seems to stop before it revs out
richer leaner question, I guess you mean the oil ratio 33:1 means 33 parts gas to 1 part oil
so 50:1 means more gas as in a leaner OIL ratio, but not FUEL ratio
FYI don't get too bogged down in the 32:1 vs. 40:1 currently I am at 50:1 and the math is 2% (50:1) oil vs. 2.5% (40:1) oil in the fuel, good luck jetting that out 33:1 is 3% oil to fuel so 1% difference will not make it oily, just jet for your conditions

Curious about the air screw. If it is horizontal and I do a 180 degree rotation is that considered half a turn? Just want to verify since I've heard many answers. And if the bike comes of the sales floor saying to use 33:1 and I never had a problem with spooge. Why is it happening now? Also I'm just looking for a recommended ratio based off of my stock settings.. Any thoughts. Thanks for all the replies. Much appreciated !

Yes 180 degrees is 1/2 turn. How much spooge are you talking about? It is possible for the clutch side crank seal to go bad and allow gear oil to get sucked in to the engine. Are you losing gear oil? Also if the new top end was installed with different thickness base gaskets it could change the compression "squish" area and might now require a jetting change. How does the bike run?

the reason it might be happening now could be a few things, needle and seat set allows a higher float level so more fuel, plug and or ignition is off a tiny bit not burning clean, compression loss could do it, air filter might need cleaning
there are many possibilities, and don't do them all at once or you won't know what fixed it, that might be handy down the road, people run 32:1 nothing wrong with it, I personally run 50:1, no big deal

I was talking to a guy I work with and he mentioned he used golden Spector synthetic oil at 50:1.. If I switched to this oil would it burn cleaner at lower speeds/rpms and could I mix it at 50:1 or 40:1 with out any problems?, hoping to clean up the small oil spooge with the stock settings adjusted? Or should I try it at 32:1?

I think you're overthinking this too much. If the factory documentation says 33:1, that is fine. 40:1 is very, very common as well (that is what I run), and the bike will run fine there too, and for most folks I have trouble believing that jetting changes will be needed going from 33:1 to 40:1. That is less than 1% change in fuel delivered.

Just run 33:1 or 40:1 and don't worry about it.

Some guys run 50:1, and that is probably fine too, but I prefer to err on the side of too much oil.

And what's your thoughts about synthetic oil? I've been running torco gp 7.. I've read good things about golden Spector synthetic..

Synthetic oils and castor (bean) oils both have advantages and disadvantages. Synthetics tend to work as designed at lower ratios in comparison to Castor oils, and they run cleaner - but they can separate from gas, and break down over time. Castor oils are more consistent, don't break down over time or separate from gas as much as synthetics, and they have a unique characteristic in which the castor oil is actually attracted to hot spots, so your engine will be lubricated where it needs it. The disadvantage is that they run a little dirtier than synthetics, and you need to stay to 32:1 to 40:1 premix ratios, depending on the manufacturer, bike, etc. I definitely wouldn't run Castor oils at 50:1 like some synthetics are designed to run at. Personally, I use Maxima Castor 927 at 32:1 and I've never had an issue with messy 'spooge', nor have I blown up a bike, and I tend to ride on the pipe a lot.

It's a matter of preference...

Maxima has an awesome article about Castor vs Synthetic here: I recommend reading it: http://www.maximausa.com/lube-news/00.php

You are way overthinking this. Just run Amsoil Interceptor at 40:1 and ride, ride, ride.

Just hold it WIDE OPEN cleans out everything pin it

I also run Golden Spectro at 50:1 the spooge you are seeing is a jetting issue, I ran the Maxima 927 for years because I loved the smell, I ran that at 40:1 and when I switched nothing changed and had the same exhaust oil as before, correct your jetting, if you are asking me my opinion it is Golden Spectro @ 50:1 but there are many opinions here and as we know,,,,,,,,,,,

And when you went to Spectro at 50:1 did you rejet ? Or did that fix your drool problem just by changing the ratio?

Jet the bike so that it runs right. Mix the oil so that it stays lubed. If you do these two things, ignore whatever comes out of the exhaust.