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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 11-01-2012, 08:46 PM   #1 (permalink)
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2001 Bonneville Getting oil Into Airbox

After going on a long run and going pretty hard I had a heap of oil spewing out of my air box and it's not from over filling as I have check this someone has told me it might be blow by from the pistons putting presure into the crank case but it's not blowing somke or losing power which Ithought would of happened if this was the case. last time I had the primary case off I notice a nylon bush with an O ring located down in it at the end of the breather tube that locates over a sharft would this have anything to do with it ? please help
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Old 11-01-2012, 09:35 PM   #2 (permalink)
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http://www.triumphrat.net/twins-talk...d-air-box.html

http://www.triumphrat.net/twins-tech...e-air-box.html

http://www.triumphrat.net/twins-tech...04-bonnie.html

http://www.triumphrat.net/twins-tech...ust-smoke.html

and so on.
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Old 11-01-2012, 09:36 PM   #3 (permalink)
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If my old memory is any good, 2001's and some 2002's had this problem more readily than later years. Yes, replace the seal on the tube inside the clutch side cover and your problem should be resolved for a long time.
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Old 11-01-2012, 11:00 PM   #4 (permalink)
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thank you very much that's what I wanted to hear I had a feeling that part was the problem I'm no bike machanic but I am machanical minded the loacal triumph dealer said he had never herd of this before bull s!#% he just wanted me to come in so he could take my money
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Old 11-02-2012, 01:12 AM   #5 (permalink)
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Another option is to disconnect the breather hose from the airbox, and fit a seperate breather filter and then run it up high so oil can't get out.

I might be wrong here.
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Old 11-02-2012, 03:01 AM   #6 (permalink)
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That's what I did (2001 Bonnie as well). I bought a small air filter at an auto parts store and fit it onto the end that went into the airbox, then just bent the hose up and zip-tied it to the carb manifold rubbers. Don't forget to plug up the hole in the airbox with something. I haven't run the bike recently to tell if this will work, but others say it does.

Before this I had all sorts of nasty oil fouling my air filter and gunking up the underside of the bike.
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Old 11-02-2012, 03:05 AM   #7 (permalink)
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What outer diameter breather filter should we be looking for?
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Old 11-02-2012, 04:54 AM   #8 (permalink)
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If the seal is at the end of it's life, it doesn't matter where you put the hose, oil will spew out at higher revs and higher throttle opening. Changing the seal is the only option.
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Old 11-02-2012, 02:05 PM   #9 (permalink)
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Quote:
Originally Posted by PieMan View Post
If the seal is at the end of it's life, it doesn't matter where you put the hose, oil will spew out at higher revs and higher throttle opening. Changing the seal is the only option.
+1 on that unless you like oil all over your bike and paying money for oil.
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Old 11-02-2012, 02:06 PM   #10 (permalink)
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Quote:
Originally Posted by luckyduck View Post
What outer diameter breather filter should we be looking for?
Earlier Bonnies around 1/4", later ones 1/2".
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