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  #71  
Old 2nd January 2010
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Originally Posted by DG_Sportster View Post
Strangely enough, it also had the little "umbrella" valves that are inside the crankcase breathers even though they were a one piece design that couldn't be split to replace the valves!
Are you sure they can't be split to replace the valves? In the '07+ parts manuals the valve itself is listed as a spare part, which it isn't in the parts manuals for earlier years. The only reason I can think of for that is that the valves can be replaced.
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  #72  
Old 2nd January 2010
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Originally Posted by Folkie View Post
Are you sure they can't be split to replace the valves? In the '07+ parts manuals the valve itself is listed as a spare part, which it isn't in the parts manuals for earlier years. The only reason I can think of for that is that the valves can be replaced.
I tried for a bit to separate the 2 halves but stopped for fear of breaking them. If they come apart, they must simply snap together ( although they would be aided by the screw that holds them into the head ), but they didn't feel or appear as though they were meant to come apart. My bike is only 2 years old and these valves are still in good shape, so i didn't force the issue.

Note pertaining to the 3 gasket styles mentioned in my above post: A set of these "other" gaskets may have been intended to service the pre-'04 3 piece rocker box style.
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  #73  
Old 8th March 2010
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I have a 99' 883 Custom with oil leaking from the rear rocker cover gasket, between the top rocker cover and the middle cover.

When I replace this gasket (item #6 on pg.3-15 in the service manual), should I be requesting the beefed up gasket and would this be refered to "the UPPER rocker cover gasket". or just the regular replacement.

Thanks
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  #74  
Old 8th March 2010
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The sevice bulletins M-1168 and M-1168A are specifically about rubber mount rocker boxes.
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  #75  
Old 9th November 2010
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here's a new spin on the leak. I have an 07 nightster, 1200, synth oil, 8,700 miles. Ive replaced the front rocker box gasket 3 times. It leaks out of the low end of the box. Last time a added silicone and flat sanded the top box for straightness. Just like always the leak stops. I add a SE air box and a K&N filter. Suddenly the rear box starts leaking!
It seems there is a connection between the air filter selection,the so called umbrella valves,oil viscosity and gravity. It seems when the oil and engine is at its hotest we park it. The much needed rocker box oil not drained or drawn into the carb system collects in the low end of the rocker box and the viscosity, oil temp, head temp all work on this part of the gasket. The blow by must increase at times causing higher rocker box pressures and blow out of weak areas in the gasket. I dont think different gaskets are the answer but a PCV valve redesign might help.
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  #76  
Old 17th February 2011
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i had this buliten done last year and aparently my bike had been in for some service and the guys installed PN "A" boxes when "C's" were available and didnt know it then when i bought the bike after about 1500miles it started leaking so i called them gave them my vin and they apologized and had me bring the bike in and they replaced (4 years later) thier mistake!!!! free of charge!!!! with version "D" and new gaskets and washed my bike for me!!! since then i have had NO leaks at all i'm very pleased with the new parts!
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  #77  
Old 18th February 2011
aoehero aoehero is offline
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update my rear box still leaks bad but it doesnt get on my pants this way.
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