Hi everyone. I have a 80's lawn boy 7071, promo model. I plan on putting it to work when it's a bit too steep for my 4 stroke push mower. I also have an echo SRM 225 and a homelite blower. Both the echo and the homelite state they need 50:1. I use red armor for the most part. If I mix 40:1 is this enough for all of my machines combined? I mix by the gallon and I want to have one tank for all of them. I currently have a tank of 50:1 that I'm running through all of them and I'm debating on going a bit richer the next time I mix. Thanks in advance.

50:1 will work just fine even in the lawn boy.

 

Stihl even tells you on their soite that their earlier equipment that was recommended for 32:1 or 40:1 should now be run with 50:1 due to many advancements in oil technology etc. Run at 50:1 and don't worry about it. Just use a decent oil of whatever brand makes you happy.

 

Just so you know Lawn boy / OMC states to use a ashless oil ( TCW3 ) to reduce engine deposits.
You will need to keep an eye on the exhaust port running low ash air cooled oil and to keep the sparkplug clean as well.

 

You shouldn't have any problem running everything at one mix at 50to1. I have a 72 polaris sled that the manual says to mix at 25to1, I run 50to1 mix in it for the last 20 years. I remember back about 1975 going to get some mix for our johnon outboard and using straight 10 weight for mix.

 

50:1 will be good for them all but if the lawn boy worries you 40:1 will work just fine for all of them as well.

 

Kinda miss the smell of someone running too rich of a mix in a lawnboy while cutting some thick spring growth.

 

Ah yes with the under deck exhaust mixing fumes directly into the clippings and creating a glorious, lasting aroma. I also used to like turning around to see the path I just mowed smoking as all the 2 stroke exhaust slowly works its way out of the grass lol.

 

Hi everyone. I have a 80's lawn boy 7071, promo model. I plan on putting it to work when it's a bit too steep for my 4 stroke push mower. I also have an echo SRM 225 and a homelite blower. Both the echo and the homelite state they need 50:1. I use red armor for the most part. If I mix 40:1 is this enough for all of my machines combined? I mix by the gallon and I want to have one tank for all of them. I currently have a tank of 50:1 that I'm running through all of them and I'm debating on going a bit richer the next time I mix. Thanks in advance.

Go to page 2 on this forum and scroll down to the following thread and I think you'll get your questions answered about 2 cycle oil and mixing ratio.

2 Cycle Engine Oil : Echo Red Armor verses Echo Power Blend Gold

 

I run Amsoil Sabre 2 stroke oil. I mix it 1.3 oz. Per gallon of aviation fuel. I run this mix in all my Shindaiwa equipment. Not one single problem! If you run aviation fuel, if your carb has the adjustment screw, it may need to be leaned out just a bit.

 

AvGas is NOT a good idea for any lawn equipment (I assume you are referring to 100LL). It has additives to prevent vapor lock and other things that are not only unnecessary but can also be detrimental to today's small 2-stroke engines. Not only that, but 100 octane fuel isn't required and can in reality run worse than 90-93 octane.

AvGas has been used for years as a "good idea" for local dirt track cars and other things, only to find out in the long run that it actually doesn't help anything at all.

Someone who has zero experience adjusting 2-stroke carbs (and no temperature gauge) to lean the mixture out is a great way to seize an engine.

 

Old thread I know, but i was poking around today. I would caution you running Av Gas. It's an amazing fuel, and the engines till love it, but it is leaded. Not great for engines that are running in close proximity to yourself for long periods of time. Just saying.

 

do not run amzoil in an old lawnboy1 it will seize up. not desighned for this lean mix. 40/1 is fine with modern oils

 

Not sure about an old Lawn boy but I switched to Amsoil last year and have been running 80:1 in everything with zero problems. Nice clean combustion chambers, no scratches in the cylinders and they all run perfectly.

 

amzoil smells great also

 

Klotz smells even better.

 

Just run 50:1 and use any octane fuel you desire a lawn boy is not picky about it.