What is a good gas mix ratio for 2 strokes

Kawinick191
Profile picture for user Kawinick191
Posts
12
Joined
11/18/2020
Location
San Diego, CA US
Kawinick191
Hey guys I just bought a 06 kx250. It’s been about 10+ years senses I’ve owned a 2 stroke. Last I remember a good gas mix ratio was 32/1. But I’ve asked around an I’ve also hear 40/1.

What is your guys recommendations ??
|
mattyhamz2 1/25/2021 6:10pm
1/25/2021 6:10pm
Depends on jetting and a few other factors.

We run 40:1 in our stock KX250. Make sure to run at least 50/50 pump and race gas if jetting is stock. They will detonate like crazy with pump gas and stock jetting
2
Rider 5280
Profile picture for user Rider 5280
Posts
2392
Joined
11/9/2011
Location
Denver Metro, CO US
Rider 5280 1/25/2021 6:13pm
1/25/2021 6:13pm Edited Date/Time 1/25/2021 8:15pm
This is obviously a loaded question, but here's what worked for me wringing my modern YZ250 2-stroke's neck WFO in the desert ...

(1) Maxima K2 @ 40:1 (but I was less nervous doing it at 32:1). But 40:1 proved safe.
(2) Bel-Ray Gear Saver 80/85W and Maxima MTL ... threw in a little extra there ;-)

P.S. There are some great 2-stroke oils out there. Don't let the nutty nuts convince you otherwise (like me, who insists on everything Maxima or Bel-Ray). Really, there's some great product out there, experiment - have fun learning!

1
Kawinick191
Profile picture for user Kawinick191
Posts
12
Joined
11/18/2020
Location
San Diego, CA US
Kawinick191 1/25/2021 7:01pm
1/25/2021 7:01pm
mattyhamz2 wrote:
Depends on jetting and a few other factors. We run 40:1 in our stock KX250. Make sure to run at least 50/50 pump and race gas...
Depends on jetting and a few other factors.

We run 40:1 in our stock KX250. Make sure to run at least 50/50 pump and race gas if jetting is stock. They will detonate like crazy with pump gas and stock jetting
I was planning on running full 110 race gas only cause that is what already run in my kx450 but It probably be a good idea to check what the jetting is now on the bike. If don’t mind me asking what jetting are you running on your kx250 ?
Kawinick191
Profile picture for user Kawinick191
Posts
12
Joined
11/18/2020
Location
San Diego, CA US
Kawinick191 1/25/2021 7:11pm
1/25/2021 7:11pm
Rider 5280 wrote:
This is obviously a loaded question, but here's what worked for me wringing my modern YZ250 2-stroke's neck WFO in the desert ... (1) Maxima K2...
This is obviously a loaded question, but here's what worked for me wringing my modern YZ250 2-stroke's neck WFO in the desert ...

(1) Maxima K2 @ 40:1 (but I was less nervous doing it at 32:1). But 40:1 proved safe.
(2) Bel-Ray Gear Saver 80/85W and Maxima MTL ... threw in a little extra there ;-)

P.S. There are some great 2-stroke oils out there. Don't let the nutty nuts convince you otherwise (like me, who insists on everything Maxima or Bel-Ray). Really, there's some great product out there, experiment - have fun learning!

Thanks for the advise any bit of anyone experiences or preferences helps. I did get the MTL maxima 80w. The guy at the store talked me out of the maxima k2 and talked me into buying the supreme M .what’s your thoughts on supreme M ?

The Shop

See All »
Rider 5280
Profile picture for user Rider 5280
Posts
2392
Joined
11/9/2011
Location
Denver Metro, CO US
Rider 5280 1/25/2021 7:21pm
1/25/2021 7:21pm Edited Date/Time 1/25/2021 7:23pm
I think Maxima Super M and Castor 927 are great oils as well.
1
HighPlainsSquid 1/25/2021 7:37pm
1/25/2021 7:37pm
I like 40:1 in anything above a 125. For 125's, I like 32:1 still.

I've played with 50 and 60, but I go back to 40 and jet accordingly. As important as the ratio, IMHE, is matching the flashpoint of the oil with the kind of riding you do.
1
Markopolo400
Profile picture for user Markopolo400
Posts
1426
Joined
7/24/2012
Location
St. Paul-ish, MN US
Markopolo400 1/25/2021 8:31pm
1/25/2021 8:31pm
32:1 Amsoil Dominator in my 06 KX250.

In reality, pick a mix and fuel and jet for it and you're fine.
1
mattyhamz2 1/25/2021 9:47pm
1/25/2021 9:47pm
mattyhamz2 wrote:
Depends on jetting and a few other factors. We run 40:1 in our stock KX250. Make sure to run at least 50/50 pump and race gas...
Depends on jetting and a few other factors.

We run 40:1 in our stock KX250. Make sure to run at least 50/50 pump and race gas if jetting is stock. They will detonate like crazy with pump gas and stock jetting
Kawinick191 wrote:
I was planning on running full 110 race gas only cause that is what already run in my kx450 but It probably be a good idea...
I was planning on running full 110 race gas only cause that is what already run in my kx450 but It probably be a good idea to check what the jetting is now on the bike. If don’t mind me asking what jetting are you running on your kx250 ?
We run straight c12 or vp110 in our 05. Stock 05 jetting
Paw Paw 271
Profile picture for user Paw Paw 271
Posts
3632
Joined
4/3/2013
Location
Benton, LA US
Paw Paw 271 1/26/2021 4:29pm
1/26/2021 4:29pm
Find out what the bike manufactor recommends and use that. There are many reasons for this, but this is the best starting point. Using any thing else will cause you to change other things to make that ration work.

Paw Paw
1
Matt Fisher 1/27/2021 5:44pm
1/27/2021 5:44pm
Side note: do a search on setting the air gap on the KX250, this often helps stay off detonation, makes it easier to start, etc.

Post a reply to: What is a good gas mix ratio for 2 strokes