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Discussion Starter #1
my oil fill cap , dipstick for my 2003 flht blew off ,the first time I did not know what it was , I thought maybe someone took it or something so I bought a new one from the dealer , $31. I put it on at the dealer drove out of there got the light took off went about 100 yards and I see something fly off of my bike sure enough it was my filler cap , what can cause this and how do I fix it , is something clogged to let the pressure out ?. Maybe a Hose or something .I do not have a book to look and see where it may be ,any help on this forum would be great . thanks
 

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Make it Run, Then Ride !!
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Something I did...

INEEDABIN,

When I first bought my 1988 Softail I changed the oil lines to braided lines. When I put the new hoses on I accidently reattached the hose improperly causing the same effect you've experienced. Have you or anyone else disconnected and reconnected the oil lines? Just a question to rule out the "dumb is me" stuff before you start looking deeper...
 

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Yup, also is the oil bag overfilled? I had the same problem on my bike when i put the 4 full quarts in. That in combination with the less venting HD chrome vent line din't mix well...I run 1/2 quart low now without any problems at all
 

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Discussion Starter #4
oil cap blowing off

neither .I did not change the oil or add, it is not overfilled nor did I change any lines , what I did do though is my air breather was real loose and 2 of the bolts took off into the wind . could not go beyond the filter so the just went bye i took it apart and put new bolts back on and tightened the bolts back up and that is It and used loc tite , could have I done something there ?. thanks for the replys guys ,
 

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Are you talking about the breather bolts the mount the air cleaner asembly to the head????If so did you replace the with another set of hallow breather bolts????? If you did than thats fine, if you put in solid bolts then that is your problem. Those 2 bolts vent the internal pressure...If you have solid bolts, take the out right away!!!
 

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Discussion Starter #6
That is exactly what I did

Those bolts backed out and got lost somewhere ,so I was over a buddys house and the whole thing was loose air cleaner assembly intake and all it was any wonder i was even moving ,only because of the fuel injection anyhow I did put the solid bolts on and did not even think of that at the time, it has been a year since I changed to the stage one and I forgot about them being hollow , I did know it but just plain forgot , anyhow , I will getthe right bolts tormorrrow at mikes HD if they have them and change them , thanks for solving my problem ,I should have known this , I would have figured it out after thinking about it after awhile, this just happened last sat and I only drove home snd down and back form the dealer which is not that far, you guys are the best on this site and thanks for the quick answer to my problem this site rocks .
 

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I did the same thing on my 08....changed air cleaners, and while I was waiting for my new mounting plate (with internal breathers) to arrive via Ebay, I connected a rubber hose between the 2 breather bolts. Bad idea. I lost 2 temp. dipsticks before I realized what the problem was. Sure makes a mess all the oil.
 

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So is this also true with S&s carbs on an Evo motor ? I just changed my air cleaner a couple weeks ago and my oil cap blew off on my way home tonight from work twice. luckily the way my solo seat sits it couldn't come all the way out just hit my leg / cover my leg in oil I'm just wondering if that's y the old cleaner only had two screws in it instead of three and if I just need to go back to two
 

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No, not those bolts... the bolts that attach the brackets to the heads, which hold the backing plate to the carb. They are generally called banjo bolts. If you tighten them too tight they break because they are hollow. They are hollow with a perpendicular hole through the shaft so that your engine can breath through the heads. There is a special hollow tube the banjo bolts hold together that you can run a drip line down to below your engine or into the backing plate/breather assy. But they still need to be tight enough not to leak.
 

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I'm guessing it would be the bolts that have the hose running between them... Is the way it's hooked up ok? Looks like it can vent between heads but would still build pressure??? I have changed oil recently as well so I could be overfilled I guess if not idk thanks guys!!!
 

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Those/that line needs to be vented to atmospheric or the backing plate.. the way it is there will be problems, oil leaks and lack of performance will be my first 2 symptoms..
 

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Yes, it needs to have a tee in the line and run to open-air....below the engine so as not to get oil mist on everything.
 
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