Using a Clarke compression device - I tested an engine today that was running a little lumpy, I suspect it is a servicing / valve adjustments, but thought while I have the chance I would test compression. It measured 200psi across all cylinders, which I think is fine - I was expecting 210 - but I am informed that the key is consistency.
Any thoughts on this.

Any recommendations for a good service in Sussex?

 

Within 10%
could be Tool error,, maybe 220 with calibrated tester

 

I'd be ok with 200 across all 4. It can vary depending on engine temps etc, but if they are all equal is shown you don't have a cylinder down.

 

Thanks chaps!