Compression Issues

[Scudder]

I've been building a bobber for a months off and on. Got most of the cosmetics finished. Dipped and rebuilt the carb, I have spark, but I checked the compression last night and was 50 psi and 70 psi on the other side. The bike started and ran pretty well before the mods started, so I assume the compression was OK then.

Now... It won't fire up. I recognize that I may have to go in and fix it, however, I would like to avoid it if possible.

Is there anything else besides carbon build up, rings , etc. that could be causing this lack of compression? I'm not expert, so I don't want to open her up when I could have fixed it with something... less major.

The mods
Pods, Jett kit, Cherry bomb shorty muffler.

Scudder

 

[Maddevill]

Did you fool around with the valve clearances? I'd do a leak down check. That will tell you whether it's the valves or the rings.

 

[Charlie G]

When you did your compression test, did you hold the throttle wide open? If not, your restricting the air intake and it will give you lower readings. My past mistake.

cg

 

[tkent02]

Valve clearance adjustment.