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  #1  
Old 24th April 2019
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Default 1987 883 breather bolts are different?

So i have a little problem... I bought a 1987 Sportster 883 engine, came with no carb, intake, air cleaner. I had a CV carb, so that was no big deal, got an intake for $10...

I figured a cheap air filter on amazon would do the trick, I got it home, come to find out the breather bolts on the 1986-1990 heads are 5/16-18... it seams that the 91+ are a 1/2 breather bolt...

I am just not sure what I should do... this is proving to be a bit of a problem
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Old 24th April 2019
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You have a 75 frame, wanting to install a 87 883 with a 91 up A/C?
More info?
90 and prior engines don't breath out the heads. No need for hollow bolts.
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  #3  
Old 24th April 2019
John Harper John Harper is offline
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The '87 motor does not breathe through the headbolts that attach the aircleaner/carburetor. Just get some regular bolts (your choice) to mount the carb bracket and/or aircleaner. The '91 and later are larger because they are hollow and vent the crankcase pressure. Your '87 vents from the hose in top of the camcase up front. I assume you have a carb bracket to hold the carb, and then attach the aircleaner?

John
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Old 24th April 2019
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Default

well then that is settled. Thank you gentlmen!

But ummmm.... then WHERE does it breathe? Do they just breath into the oil tank? Also this winter when I install 1200 pistons and 04+ heads will it then breath out of the heads?


Quote:
Originally Posted by John Harper View Post
The '87 motor does not breathe through the headbolts that attach the aircleaner/carburetor. Just get some regular bolts (your choice) to mount the carb bracket and/or aircleaner. The '91 and later are larger because they are hollow and vent the crankcase pressure. Your '87 vents from the hose in top of the camcase up front. I assume you have a carb bracket to hold the carb, and then attach the aircleaner?

John
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Old 24th April 2019
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Default

Yes... lol... it’s been a journey so far... lots of frame work... lots of cussing... grinding... welding... more cussing... I little praying too... but it’s looking like it might all come together this weekend

Quote:
Originally Posted by Hippysmack View Post
You have a 75 frame, wanting to install a 87 883 with a 91 up A/C?
More info?
90 and prior engines don't breath out the heads. No need for hollow bolts.
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  #6  
Old 24th April 2019
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Old 24th April 2019
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Quote:
WHERE does it breathe?
Welcome to the lightest era of Sportster.

As John explained, there should be a hose that comes out of the front of the cam chest at about 10 O'clock and heads up to the back of the air filter,
or where ever you want to route it. Behind that bulge in the cam chest sits an elastomer umbrella valve.

You could save yourself a lot of hassle if you obtain an HD destruction manual and parts list for this era of Sportster, as there are numerous differences
to the later Evos.
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Old 24th April 2019
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Quote:
Originally Posted by ericfx1984 View Post
Also this winter when I install 1200 pistons and 04+ heads will it then breath out of the heads?
You can remove the umbrellas in the rockers and plug the head breathers with regular bolts to keep the fourspeed breathing system.

But you can't keep the head breathers instead do to not having breather holes through the lifter bores in the 87.

More on crankcase ventilation in the XLFs Sportsterpedia:
http://sportsterpedia.com/doku.php/t...:evo:engmech07



edit:
Come to think of it,
Using stock 87 rocker boxes, you won't have to mod them.
Just keep them like they are and plug the head breathers.

Last edited by Hippysmack; 24th April 2019 at 15:40..
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Old 1st May 2019
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Default

So on my old Ironhead it vented out the same hole on the cam chest cover, but it just had a little metal tube

So do I have to run it it the A/C or can I just dump to atmosphere?

Quote:
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Old 1st May 2019
Four Speed Four Speed is offline
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Quote:
So do I have to run it it the A/C or can I just dump to atmosphere?
Probably your choice unless there are prevailing rules where you live. You might want to check that the umbrella valve is still working
before you position the hose. A working valve should help reduce oil mist. Use a bit of clean pipe and blow gently through the breather - it should close the valve.
You may have to look to the aftermarket if the valve is shot as replacements are hard to come by now and the 5 speed ones do not fit.
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