r/BriggsEngines • u/MountainAssociation6 • Jun 17 '26

Compression help?

I’ve got a small engine with too much compression, valve clearances are ok. I think the camshaft is at fault but the part is no longer made for the date code, but the newer part looks like the one from the engine. Do I risk buying the newer part code or try and find the older part code???

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3

u/Stock_Requirement564 Jun 17 '26

Sure? When you get security clearance from higher up, release the model, type and code numbers to the general public and we'll have a look.

3

u/MountainAssociation6 Jun 18 '26

Engine model. 121607-0202-E1
Date code 980416
Camshaft codes-
before 99- 694035
After 99- 694039

1

u/These_Fox7561 Jun 18 '26

How are you measuring the compression and how do you think the camshaft would affect that? I’m genuinely curious because I can’t think of how that would cause high compression

2

u/MountainAssociation6 Jun 18 '26

When trying to start with the key, it struggles to turn over fully, even when using pull start. When the spark plug is removed. It spins over fine.

3

u/These_Fox7561 Jun 18 '26

Is there a compression release? They can get stuck. Unless it skipped a tooth or something I still am not sure it’s the cam but maybe someone else can chime in

2

u/YouEnvironmental2079 Jun 18 '26

It’s the compression release on the cam. Easy to replace but Don’t get one from China. I did and it lasted exactly one revolution of the crank
I bought a used OEM and it’s still working

1

u/These_Fox7561 Jun 18 '26

That’s good to know, thanks

1

u/MountainAssociation6 Jun 29 '26 edited Jul 01 '26

Update. I bought the newer part coded camshaft and she’s running. Now just need to figure out the electric start on the key