Rebuilding a model 7266

[Two-Stroke]

I just bought a lawn boy mechanic's book and it says that you should only use lawn boy 2 cycle oil, not generic 2 cycle like Sears, etc. Is there that much difference in quality? What are you all using?

I use Poulan oil at 50:1. The newer oils are better -- the technology has improved a lot in 20 to 30 years. I haven't had a problem with that higher ratio.

I'm always skeptical of any company promoting its own product in a manual. And I'm a huge LB fan.

 

[DPI]

I use Poulan oil at 50:1. The newer oils are better -- the technology has improved a lot in 20 to 30 years. I haven't had a problem with that higher ratio.

I'm always skeptical of any company promoting its own product in a manual. And I'm a huge LB fan.

Okay, now I'm confused. I have been using 8oz of 2 cycle oil to a gallon of gas. What exactly are you mixing?

 

[Fireman 123]

8oz to 2 gal gives you a 32:1 ratio. This is what I use.

 

[Two-Stroke]

Okay, now I'm confused. I have been using 8oz of 2 cycle oil to a gallon of gas. What exactly are you mixing?

If you mix at 50:1 it works out to 2.56 oz per gallon. The containers that I buy have a second chamber on top and I squeeze the bottom chamber until the oil gets to the line for 50:1.

You've been mixing at 16:1 and I think that's outdated given current oil technology.

 

[DPI]

If you mix at 50:1 it works out to 2.56 oz per gallon. The containers that I buy have a second chamber on top and I squeeze the bottom chamber until the oil gets to the line for 50:1.

You've been mixing at 16:1 and I think that's outdated given current oil technology.

Thanks Fireman and Two-Stroke for the info. All these years, I have just been following the recommendation on the back of the shroud. This is the same mixture for my leaf blower so this makes my life easier.

Another question - when you put the piston and new rings back in the cylinder, did you need to use a ring compressor? The old piston and rings just slip right in and out so I was thinking of just putting a good amount of oil in the cylinder and just trying to slide the new assembly in without the tool.

Just took some pictures so I will upload soon.

 

[Fireman 123]

You will need some type of compressor. I've used an ordinary worm clamp before but it's a little tricky.

 

[DPI]

I decided to clean up the original piston and reuse it. Took a while to clean it up but it turned out nice. I got a piston/ring installer from Auto Zone to do the install. If I get enough time, I hope to reassemble the motor tomorrow.

I bought some used mower wheels off of ebay to replace the worn out originals. They look identical, but I noticed that the wheels have slightly larger mounting holes so they are loose with the original mounting bolts. Do I need to get different bolts that fit these wheels?

 

[DPI]

Well, I put it back together today and I still have about 1/16" play in the crankshaft so I guess I will be either using the F series bearing fix or finding a new crankshaft body. Are all F series bearings the same or is there a specific one I should use?

 

[Fireman 123]

Unless you just want to take everything back apart, I wouldn't worry about 1/16 of play. ESP if it runs good.

 

[WhyZed]

Well, I put it back together today and I still have about 1/16" play in the crankshaft so I guess I will be either using the F series bearing fix or finding a new crankshaft body. Are all F series bearings the same or is there a specific one I should use?

Is the play up and down or side to side?

Side to side play is fine. There should be no up and down play