Leak Down Question
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From: almost there
Leak Down Question
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?
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From: Farmington ,MS
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Seasoned HDF Member
Joined: Sep 2012
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From: almost there
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 have a Dyna Coil ordered and will see if that will do it.
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Seasoned HDF Member
Joined: Sep 2012
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From: almost there
I guess Im on the right track since nobody has any input on what's wrong with my bike.
Thanks anyway.
Thanks anyway.
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From: NW AR
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?
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?
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Thread Starter
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Seasoned HDF Member
Joined: Sep 2012
Posts: 6,570
Likes: 590
From: almost there
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?
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?
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
Last edited by aces&8s; Apr 24, 2017 at 06:06 PM.