I checked my cold compression today after putting 25K miles on my last build. Both cylinders were the same, 208 lbs and in one minute leaked to 180 lbs. Is this a normal leak down?

 

That's not a leak down test, but your numbers look good to me.

 

I never did a leak dn and assumed the compression gauge was showing leak dn.
Can someone explain a leak dn test?

 

http://www.hotrod.com/articles/cylin...akdown-tester/

 

Thanks Tom, I just checked out youtube video of leak dn.

 

Reason for all the question is my back cyl has a misfire but at higher rpm it smoothes out. So trying to fix the problem I installed a new Dynatech ignition. Didn't fix it.
I have a Dyna Coil ordered and will see if that will do it.

 

I guess Im on the right track since nobody has any input on what's wrong with my bike.
Thanks anyway.

 

You didn't ask what was wrong with your bike. You asked if your numbers looked good. Besides that you didn't do a leak down test, your compression numbers look real good and a leak down test on that motor would be mostly wasted time, besides as a learning experience.

Now, what do the spark plugs look like? Have you checked for vacuum leaks with some carb cleaner? What carb is this? How are you determining the rear cylinder isn't firing? If you swap the leads at the spark plugs, does the miss move?

 

Spark plugs are perfect color and I also changed them and the wires.
Yes, no intake leaks with carb cleaner.
Its S&S carb and I dropped the bowl and pulled the jets, all is well.
It's missing pretty badly and the rear cyl exhaust makes a fluff sound at idle.
No I have not flipped the plug wires yet.
A new coil is on the way in the mail. Thanks

 

Great, I figured out what was wrong.