compression

[gregjo1948]

Working on an 11.5hp I/C Briggs. The plastic recoil parts are broken, even the handle grip that you pull. The owner wants it converted to electic start because it pulls over so hard it breaks the recoil. I installed a stator,flywheel with starter ring gear and a starter. The engine has too much compression for the starter to roll it over. Now I see why he wanted it converted to electric start. My question is, why so much compression? Is there a compression release somewhere on this engine? Did Briggs put in the wrong piston or the wrong head. The owner says probably isn't 20 hours on the engine and it has always been mean to pull over. Any ideas would be appreciated. Thank you, gregjo1948

 

[mechanic mark]

Adjust valves per b&s instructions, you will notice a considerable difference. Just enter your model xxxxxx, type xxxx, and trim xx numbers from engine for specs.


https://www.google.com/webhp?source...F-8#q=adjusting valves b&s 11.5 hp i/c engine

 

[Fish]

Also, pull the head off, and clean the piston top and the combustion chamber......

 

[EngineMan]

There is no compression release that I know of, remove the spark plug and then see if you can turn over engine by hand, you do not say if it run OK when the owner did get it to run, and did you check the valve clearance and that they are working correctly.

 

[EngineMan]

Also, pull the head off, and clean the piston top and the combustion chamber......

Its only got 20 hours..!

 

[gregjo1948]

Adjust valves per b&s instructions, you will notice a considerable difference. Just enter your model xxxxxx, type xxxx, and trim xx numbers from engine for specs.


https://www.google.com/webhp?source...F-8#q=adjusting valves b&s 11.5 hp i/c engine

I'll look into adjusting the valves if I can figure out the model/type/trim. It says Family 5BSXS 3442 VM 276012. Another place it is 050303ZA02521. What numbers/letters do I use? Thanks, gregjo1948