I've tested the compressions on my CB750KZ as its been difficult to start and I get 125-100-105-130. Putting a squirt of oil in the bores didnt make much difference but that maybe cos its been stored for a few months and i did put some oil in before storage. I did put new rings in when i rebuilt it 2 years ago (its not been on the road since) but i didnt glaze bust the bores. Any ideas why the compressions are on the low side? Should i check the valve clearances first?