Engine Experts Please Read....
Thread Starter
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Cruiser
Joined: Sep 2007
Posts: 124
Likes: 38
From: Middleburg, FL
Engine Experts Please Read....
BURNING OIL/ Twin Cam w/ S&S 106
Did a big bore upgrade. Had the heads ported and polished. Put it all together and commenced the break-in. Used Mobil 1 as recommended by S&S. Changed oil at 50 miles, 500 miles and again at around 1100 miles. All went well, bike ran great with no apparent issues. At around 2000 miles it started burning oil at a pretty good click (black smoke on acceleration, not blue). It's only the front cylinder (nasty spark plug). I was adding a quart every few hundred miles, the bike runs fine otherwise and makes no abnormal noise except when the oil gets to low (rockers/pushrods ticking). When I did the oil changes during the break-in, I got plenty of oil out and had no signs of burning oil.
Could the rings still be bad? Valve guide seals? (Heads disassembled) I plan on doing a leak down test to see if I can figure out which. Not looking forward to ripping it apart again. Anyhow, thanks for any advice in advance.
Did a big bore upgrade. Had the heads ported and polished. Put it all together and commenced the break-in. Used Mobil 1 as recommended by S&S. Changed oil at 50 miles, 500 miles and again at around 1100 miles. All went well, bike ran great with no apparent issues. At around 2000 miles it started burning oil at a pretty good click (black smoke on acceleration, not blue). It's only the front cylinder (nasty spark plug). I was adding a quart every few hundred miles, the bike runs fine otherwise and makes no abnormal noise except when the oil gets to low (rockers/pushrods ticking). When I did the oil changes during the break-in, I got plenty of oil out and had no signs of burning oil.
Could the rings still be bad? Valve guide seals? (Heads disassembled) I plan on doing a leak down test to see if I can figure out which. Not looking forward to ripping it apart again. Anyhow, thanks for any advice in advance.
Tourer
Joined: Apr 2011
Posts: 251
Likes: 0
From: sun valley ca.usa
Black smoke usualy indicates unburnt fuel not oil ..what does that front plug look like ? actually wet with oil? a compression test will tell quickly if the cyl pressure is different from front to back ..I have seen a fresh rebuilt norton smoke cause the ring gaps were lined up
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Joined: Dec 2007
Posts: 12,084
Likes: 829
BURNING OIL/ Twin Cam w/ S&S 106
Did a big bore upgrade. Had the heads ported and polished. Put it all together and commenced the break-in. Used Mobil 1 as recommended by S&S. Changed oil at 50 miles, 500 miles and again at around 1100 miles. All went well, bike ran great with no apparent issues. At around 2000 miles it started burning oil at a pretty good click (black smoke on acceleration, not blue). It's only the front cylinder (nasty spark plug). I was adding a quart every few hundred miles, the bike runs fine otherwise and makes no abnormal noise except when the oil gets to low (rockers/pushrods ticking). When I did the oil changes during the break-in, I got plenty of oil out and had no signs of burning oil.
Could the rings still be bad? Valve guide seals? (Heads disassembled) I plan on doing a leak down test to see if I can figure out which. Not looking forward to ripping it apart again. Anyhow, thanks for any advice in advance.
Did a big bore upgrade. Had the heads ported and polished. Put it all together and commenced the break-in. Used Mobil 1 as recommended by S&S. Changed oil at 50 miles, 500 miles and again at around 1100 miles. All went well, bike ran great with no apparent issues. At around 2000 miles it started burning oil at a pretty good click (black smoke on acceleration, not blue). It's only the front cylinder (nasty spark plug). I was adding a quart every few hundred miles, the bike runs fine otherwise and makes no abnormal noise except when the oil gets to low (rockers/pushrods ticking). When I did the oil changes during the break-in, I got plenty of oil out and had no signs of burning oil.
Could the rings still be bad? Valve guide seals? (Heads disassembled) I plan on doing a leak down test to see if I can figure out which. Not looking forward to ripping it apart again. Anyhow, thanks for any advice in advance.
Pull the air filter, and look into the t/body, as well as pull the pipes and have a look into the ports, for signs of oil in both areas.
Scott
Thread Starter
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Cruiser
Joined: Sep 2007
Posts: 124
Likes: 38
From: Middleburg, FL
Black smoke usualy indicates unburnt fuel not oil ..what does that front plug look like ? actually wet with oil? a compression test will tell quickly if the cyl pressure is different from front to back ..I have seen a fresh rebuilt norton smoke cause the ring gaps were lined up
Road Warrior
Joined: Dec 2006
Posts: 1,859
Likes: 11
From: The South
I hope it isn't the ring gap or cracked rings from not being gapped right. Compression test it so you'll know where to start. Bob
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Banned
Joined: Sep 2009
Posts: 3,569
Likes: 624
From: deland,florida
a extreamly rich condidition cound have washed the cylinder down,causing the rings not to seat(kinda funny to have in only one cyl. though),do a leak down or pull heads to check guides
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