[lawn boy76]

I just bought my first bricktop . It's a lawn boy 7024 . I'm going to give a compression test and would like to know how much compression these old bricktops should have ?

 

[Lawnboy77]

Mininum cold 65 psi, normal cold 70-85 psi., normal hot 60-80 psi.

 

[lawn boy76]

Thanks for the help

 

[Mike72]

For accurate readings when checking compression on a small two stroke like a Lawn Boy, find a compression gauge that has a Schrader valve (tire valve) right in the end that screws into the spark plug hole.

 

[WhyZed]

Mines not a brick tops but my;

F - 130psi.
D409 - 60psi (ring gap was .075 - both rings) just bought used :sidelaugh

 

[Lawnboy77]

Mines not a brick tops but my;

F - 130psi.
D409 - 60psi (ring gap was .075 - both rings) just bought used :sidelaugh

That is outstanding compression for ring end gaps of .075 on your D series, I think you may need a .030 over piston for that cylinder. LOL I have a few worn out cylinders that I woud like to do that with...but I only have one .030 over piston though.

Your F series has outstanding compression to, about 125 psi. is the best I have seen from any of mine.

 

[Lawnboy77]

Mines not a brick tops but my;

F - 130psi.
D409 - 60psi (ring gap was .075 - both rings) just bought used :sidelaugh

I assumed that the ring end gap was checked with new rings, but I think you were checking with the old rings, so yeah with new rings that compression should be great.

 

[WhyZed]

I assumed that the ring end gap was checked with new rings, but I think you were checking with the old rings, so yeah with new rings that compression should be great.

I didn't check the 'F's' ring end gap, the compression was so good I didn't open it up - just cut the lawn with it. This one was a garbage day find..

The D409 I just bought and it wouldn't start even with gas in the plug hole so I dug out the compression tester. The farther I dug in the worse it got until I measured the massive ring gap then I started laughing :sidelaugh I'm waiting till Tuesday for my new rings to arrive, then I'll test again.