Bad Valve Seals
Extreme HDF Member
Joined: Sep 2010
Posts: 14,744
Likes: 402
From: Phoenix '53, '88, '09 Big Twins
a sign of bad valve seals will be a pooof of white smoke on start up- the oil leaks past the seals into the cylinder while the motor is off.
white smoke on accel is bad piston ring seal to cylinder walls or wear
white smoke on decel can be bad valve seals, valve guide
Mike
white smoke on accel is bad piston ring seal to cylinder walls or wear
white smoke on decel can be bad valve seals, valve guide
Mike
Last edited by mkguitar; Mar 30, 2012 at 09:21 PM.
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Cruiser
Joined: Apr 2008
Posts: 155
Likes: 0
From:
Yes it is my 2012. When I had the kit installed my buddies noticed that my left tail pipe kept smoking when I got on the throttle. I didn't think anything about it until I rode the bike to Daytona bike week. On the way there I noticed my oil pressure had kept fluctuating. I pulled into the nearest service station to check my oil. I was nearly three quarts low and the oil was black as tar. This was after my service and oil change. Once I got to Daytona I changed the oil and put Amzoil synthetic in it. It seems to lessen the smoke a bit, but still smoked a bit. The bike pulled fine. Once I got it back home I took it into the HD shop. They're replacing my valve seals and piston rings. The front cylinder had 120 lbs compression and the rear had 160. Waiting to see the performance afterwards. .
Extreme HDF Member
Joined: Sep 2010
Posts: 14,744
Likes: 402
From: Phoenix '53, '88, '09 Big Twins
looking at your other post about dyno number and stage 4, I'm guessing the build/machining was poor.
or the break in was not done gradually and the cylinders and piston rings didn't mate
mike
or the break in was not done gradually and the cylinders and piston rings didn't mate
mike
Seasoned HDF Member
Joined: Apr 2006
Posts: 10,675
Likes: 95
From: Billings,Mt.
May not hamper performance in the beginning but over time the oil will burn onto the valve stems and clog the ports and also the seats.
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Cruiser
Joined: Jan 2012
Posts: 166
Likes: 2
From: Pa
If the bike came as a 103" from the factory, does a stage iv kit replace the pistons for higher comp. I'm just curious why the cylinder-piston combination would have been changed but still remain 103".
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Extreme HDF Member
Joined: Sep 2010
Posts: 14,744
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From: Phoenix '53, '88, '09 Big Twins
jeez, hope the shop covers their work, rather than stick you with a bill.
the results say that the work was not to a professional standard, and should be rectified
Mike
the results say that the work was not to a professional standard, and should be rectified
Mike
Last edited by mkguitar; Mar 31, 2012 at 12:04 PM.