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15th December 2012
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XL FORUM TEAM MEMBER
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Join Date: Jul 2010
Posts: 257
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Blue Smoke! Nooooooooooo
1980 fresh rebuild, lots of mods, runs great (still) but I'm gettin oil (and of course blue smoke) out of my back cyl exhaust, droplets are spraying out of the back exhaust at the head. I have idled it and run about 15 miles. I am of course going to do a compression test. It fires right up and idles smoothly as ever so I'm thinking (hoping) non fatal failure. Thoughts? Normal checklist to run down? before I disclose all the mods done by a "guru" (major falling out). 
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Rubber side down...
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15th December 2012
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Senior Master Custom Bike Builder
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Join Date: Jun 2008
Location: Cornelius, OR
Posts: 9,542
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Is the plug as oily as the exhaust?
Maybe a bad exhaust guide?
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Ryder Rick "I know right from wrong, but sometimes, wrong feels right"
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15th December 2012
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XL FORUM TEAM MEMBER
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Join Date: Jul 2010
Posts: 257
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It's Black but not oil-soaked. I was kinda hopin' valve guide. They were supposed to have been replaced but that was right around the "falling out".
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15th December 2012
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Senior Chief Master Mechanic 2nd Class
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Join Date: Mar 2009
Posts: 1,549
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It's possible one of the rings got broke when installing the piston into the cylinder, it's not all that common, but it happens.
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15th December 2012
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Senior Master Custom Bike Builder
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Join Date: Jul 2009
Location: SW Pennsylvania
Posts: 4,276 Sportster/Buell Model: XLH Spinegrinder Sportster/Buell Year: 1978 Sportster/Buell Model #2: XLCH Frankenstien Sportster/Buell Year #2: 1976 Other Motorcycle Model: Triumph Groanyville Other Motorcycle Year: 1972
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You're not even close to broken in yet. Run your bike 485 more miles, post back on condition. [ This applies to a normal rebuild].
That said, what modifications are we discussing here?
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Ordinarily he is insane, but he has his lucid moments when he is only stupid
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15th December 2012
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XL FORUM TEAM MEMBER
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Join Date: Jul 2010
Posts: 257
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Wiseco 10:1 pistons, Cams, new oil pump all new bearings, Re-contoured heads, a bunch of added breathers and oil feeder lines (I know those might be the problem) 2 oil feeders just below ring line on each cylinder, 3 breather lines on each rocker cover. I just rerouted two "breather" lines to each other because they were dripping oil (just a few drops) this could be causing it as well. I have seen lines connecting rocker covers in the past so I thought it might be OK.
I'll post some pix tomorrow. I'm away from the bike today.
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15th December 2012
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XL FORUM TEAM MEMBER
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Join Date: Jul 2010
Posts: 257
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I looked in thru the sparkplug hole and don't see anything out of the ordinary. super clean still see all the honing marks. A long way to go for breaking in and seating everything... Could that be the thing? A little blue smoke I can understand, but the droplets?
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15th December 2012
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Senior Master Custom Bike Builder
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Join Date: Jul 2009
Location: SW Pennsylvania
Posts: 4,276 Sportster/Buell Model: XLH Spinegrinder Sportster/Buell Year: 1978 Sportster/Buell Model #2: XLCH Frankenstien Sportster/Buell Year #2: 1976 Other Motorcycle Model: Triumph Groanyville Other Motorcycle Year: 1972
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You best post a picture or two. From your description it sounds like...hell I don't know what it sounds like.
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15th December 2012
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Rider Of The Iron Steed
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Join Date: Dec 2003
Location: London, ON Canada
Posts: 32,546 Sportster/Buell Model: XLH Sportster/Buell Year: 1978
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I would check the pushrod adjustment and the ignition timing.
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16th December 2012
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Senior Master Custom Bike Builder
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Join Date: May 2010
Location: Pottstown PA.
Posts: 14,386 Sportster/Buell Model: xlch Sportster/Buell Year: 1960
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definitely not broken in yet,but what's going on with all the extra oil line's? post a,pic of them
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72 1000cc barrels and heads, s&s 41/2'' flywheels, sifton cams, s&s super B w/ zippers thunderjet w/yost powertube, andrews gears,and shafts, competition engineering kevlar wet or dry clutch, 72 oil pump, morris magneto w/auto advance and single fire module, cycle electric generator w/electronic regulator,73 cu.in.
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