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Sportster Motorcycle Motor - Top End Discuss Sportster Motorcycle Top End issues. Rockerboxes, Valves, Cylinders, Pistons, Rings, Lift Rods, etc...

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intake valves

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  #11  
Old 3rd March 2021
sungod's Avatar
sungod sungod is offline
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Sportster/Buell Model: sportster xlch
Sportster/Buell Year: 1970
Sportster/Buell Model #2: sportster xlh
Sportster/Buell Year #2: 73
Other Motorcycle Model: 99 inch sportster
Other Motorcycle Year: 2003
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Default inlet valve

If the breather was puking oil there would be oil all over the air cleaner,carb and port.The port is slanted and oil accumulates and cooks at the back making the black mark on the wall.Nothing to worry about unless you notice loss of power or smoking or loss of compression. Best to have an ebs filter,can or hose.What is the condition of the piston tops? How many miles on the engine?
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  #12  
Old 3rd March 2021
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Sportster/Buell Model: 2004 XL1200R
Sportster/Buell Year: SOLD
Sportster/Buell Model #2: 2000 X-1 lightning
Sportster/Buell Year #2: SOLD
Other Motorcycle Model: XB1200XT "Uly"
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When my valve stem seals went bad (2004 with pretty low 15k? miles) it was pointed out by a friend that it was smoking heavily on deceleration. I never saw the classic start up smoking like a chevy 350.
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  #13  
Old 3rd March 2021
T_worth T_worth is offline
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Quote:
Originally Posted by Maxeffort View Post
All these bikes inhale oily crankcase fumes when the breathers are connected to the air filter. Venting the fumes externally is the easiest solution.

You aren’t in dire need of doing anything. If the plugs are staying clean, no puff of smoke on start up, I wouldn’t worry about it too much.
Quote:
Originally Posted by sungod View Post
The port is slanted and oil accumulates and cooks at the back making the black mark on the wall.Nothing to worry about unless you notice loss of power or smoking or loss of compression. Best to have an ebs filter,can or hose.What is the condition of the piston tops? How many miles on the engine?
So with the super e carb that I just took off, the breather and air cleaner bracket is one unit. The breathers lead to the air cleaner. I'm being cheap and was going to try and reuse the s&s external breather system.

I'm not crazy about the idea of mesh screen breather bolts and having a coat of oil on the side of my engine/pants. I'm leaning towards breather banjo bolts/fittings into a catch can/filter. I just need to find bolts that'll fit with my carb support bracket

I'm not sure how many miles the bike has, or if the previous owner ever cleaned it. I haven't looked at top of pistons yet, but I can imagine what they look like. The bike runs well, but it does run rich. I have Paughco upsweep drag pipes too with washer lollipops to help with the reversion.
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  #14  
Old 4th March 2021
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sungod sungod is offline
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Posts: 249
Sportster/Buell Model: sportster xlch
Sportster/Buell Year: 1970
Sportster/Buell Model #2: sportster xlh
Sportster/Buell Year #2: 73
Other Motorcycle Model: 99 inch sportster
Other Motorcycle Year: 2003
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Default intake valve

DK Customs has a variety of breather bolts and kits.
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