Decompressors

[mr-moe]

B&S--- 404577 0291 E1, typical won't turn over past compress TDC.
Have checked all the usual things, battery, and connections for high resistance.
Adjusted valve clearances.
It's time to change out the camshaft.
Lo and behold no decompressor on the camshaft.
There is no evidence there ever was one.
No debris on the sump.
Cam shaft #797242.

[mr-moe]

Did some engines not have the mechanical decompressors on the cam?
And if so what was used?

[bgsengine]

Some of them only had an extra bump on cam lobe (Intake lobe if memory serves) very near to TDC , camshaft was a common cause of compression-caused hard starting. Assuming your starter amps draw checks out, and no voltage drops, or bad grounds and any other mechanical issues accounted for (An actual compression check can help, I believe Briggs service manual has a compression test value for too much compression) then I'd assume it may be time to source a new camshaft. Other engines (but I believe they were Kohler or Kawasaki or both) could be equipped with a higher torque starter (Typically they have the solenoid integrated into starter) and those didn't (often) have compression release

[KE4AVB]

Images of the new camshaft shows a decompresser system. The camshaft is the past didn't have a decompresser setup. Actually 797242 is the fifth generation of this engine's camshaft.



https://www.amazon.com/Briggs-Stratton-797242-Camshaft/dp/B01FSYXXU6

[mr-moe]

Thanks to all.
Will have to order one up from Briggs.

[mr-moe]

Got the new cam from Briggs,now engine starts like it should.

Now time to clean carb and get idle smoothed out.
Thanks.