Compression tests
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Outstanding HDF Member
Joined: May 2008
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From: Mount Holly, NC
Compression tests
The other day i'm cruising along and I feel a weird vibration when the engine is unloaded... or, when the throttle is feeding the exact amount of fuel required to maintain speed. I swear it feels like a bearing. I change the oil and everything looks as it always does. I'm a bit worried. So I do a compression test and nothings changed since the last compression test 20k miles ago. 185ish. This is when I decide to check the manual to see what it should be. Ugh, its supposed to be above 200psi. And whats more, it jumps to 240ish with a squirt of oil.
What a pain in the ***.
What a pain in the ***.
Thread Starter
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Outstanding HDF Member
Joined: May 2008
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From: Mount Holly, NC
Front cyl is lowest at 170 dry / 240 wet. Rear is 185 dry / 250 wet. I know this has nothing to do with vibration or bearings, but I got the ******* now so I'm in paranoid-test-mode.
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Outstanding HDF Member
Joined: May 2008
Posts: 2,230
Likes: 12
From: Mount Holly, NC
well she's at the shop now. i told the tech about the vibration and the compression tests results... the look on his face spelled d o o m. but, they took the nightster in and cut the 1125r loose early (since i dont have a car). i guess i'll hear the results in a few days, but my guess is its going to need rings.
the silver lining is the 1125 got a new download and the herky-jerky fueling problems are gone. my last suspension changes were a welcome change. i zoomed around the backroads a bit today and had a great time. it keeps getting better and better.
the silver lining is the 1125 got a new download and the herky-jerky fueling problems are gone. my last suspension changes were a welcome change. i zoomed around the backroads a bit today and had a great time. it keeps getting better and better.
he left himself wide open for that one.......nice.
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From: Mount Holly, NC
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that freakin sucks, seems like that milage is WAY to low for rings...keep us posted, sorry about the deal
Road Master
Joined: Jun 2009
Posts: 933
Likes: 1
From: Indianapolis
Yeah I would say rings for sure especially with the results of the wet test. Do you have an aftermarket fuel controller? If you do I would say the rings washed out, and you should see about getting the settings re done. Did you happen to get a smell of your oil when you changed it? Smelling gas in the oil is almost always a sign of running too rich and being well on your way to new rings. If you don't have one then wow Harley motors suck!