Welcome to the DoItYourself Forums!

To post questions, help other DIYers and reduce advertising (like the one on your left), join our DIY community. It's free!

2-stroke fuel mixture


EliasMcDaniel's Avatar
Member

Join Date: Apr 2013
Posts: 143
OH

07-14-17, 07:23 AM   #1  
2-stroke fuel mixture

I have a string trimmer that runs on 50:1 gas/oil mixture, and a blower that needs 40:1.

The blower might use two tanks of fuel a year, while the string trimmer probably goes through two gallons.

Instead of keeping two separate cans - with the 40:1 probably going "stale" before it's empty, how much harm would it cause on the blower to run a 50:1 mix?

 
Sponsored Links
pugsl's Avatar
Forum Topic Moderator

Join Date: Mar 2008
Posts: 7,551
NC

07-14-17, 08:36 AM   #2  
May foul plug but I don't think it will effect it.

 
Bud9051's Avatar
Member

Join Date: Oct 2008
Posts: 9,766
ME

07-14-17, 09:07 AM   #3  
Wouldn't 50:1 be less oil than 40:1?

If my thinking is correct?? I would keep 50:1 on hand and work out how much oil would be needed to make it 40:1. I used to keep a plastic see through oil container around so I could custom mix for different engines, only what I needed.

Bud

 
geogrubb's Avatar
Member

Join Date: Jun 2006
Posts: 2,333
MO

07-14-17, 09:14 AM   #4  
You would b better off using the 40:1 mix in both since it has more oil, unless both tools are high end products they would benefit from the extra lube. Have a good one. Geo

 
marksr's Avatar
Forum Topic Moderator

Join Date: Mar 2005
Posts: 42,794
TN

07-14-17, 09:17 AM   #5  
I agree with geo, I'd run the 40:1 in both if I was to only have one mix. It's better to have too much oil than not enough!


retired painter/contractor avid DIYer

 
Pilot Dane's Avatar
Group Moderator

Join Date: Mar 2003
Posts: 16,683
NC

07-14-17, 03:22 PM   #6  
I run all my two strokes on the same ratio with Stihl HP Ultimate oil. Even the really old stuff that calls for 16:1 is still running strong. So, I wouldn't hesitate running one lower oil fuel if using a quality synthetic oil but if you're using a traditional oil I'd run the higher oil ratio in everything.

 
alan73's Avatar
Member

Join Date: Aug 2015
Posts: 215
MO

07-14-17, 07:14 PM   #7  
would also just run the most common 50:1 with a good quality oil, to lean of fuel mixture is what most often causes engine damage to air cooled two strokes if the engine isn't getting enough fuel do to carb, vacuum leaks or other issues really wont matter if your using 40 or 50 to 1 the oil wont be getting to the engine anyway so damage is likely to occur.

 
Tolyn Ironhand's Avatar
Group Moderator

Join Date: Nov 2007
Posts: 11,816
MN

07-15-17, 05:42 AM   #8  
I use universal synthetic 2 stroke oil in all my 2 stroke equipment. It is good for all 2 stroke engines and all ratios up to 50:1. Everything runs great, I never had an issue, it is widely available, and you only need to keep one tank of fuel.

I have used both Stihl and Arnold (MTD)


Electrical AC/DC and lighting Moderator
Professional Electrician, Handyman, all around swell guy!
40,000 people die in auto accidents per year in the US. We should ban cars.

 
marbobj's Avatar
Member

Join Date: May 2006
Posts: 3,658
IA

07-18-17, 03:44 AM   #9  
If you're talking about the same in everything, I would use the 40:1 mix, especially for hot weather running.

 
SamC130's Avatar
Member

Join Date: Jul 2017
Posts: 12
TX

07-28-17, 03:36 PM   #10  
I have been using AMSOIL 100:1 in two-stroke engines for years and it works fine. It runs cleaner and I've never found carbon in the exhaust.

 
Search this Thread