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Offline Siberman

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What's this for?
« on: May 08, 2020, 05:42 PM »
I'm preparing to change the spark plugs and was wondering what the clear plastic tube, on the underneath of the air box, is for. It is blocked with a metal plug. Also, is there supposed to be a spark plug spanner included in the tool kit (MK3)???



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Offline Stewie

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Re: What's this for?
« Reply #1 on: May 08, 2020, 05:53 PM »
Probably an oil drain.
The crankcase breather should go to the air box and if you get any oil mist that collects it has to drain  somewhere.

Offline Siberman

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Re: What's this for?
« Reply #2 on: May 08, 2020, 06:19 PM »
So should I remove the metal plug from the end of the tube?  :027:
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Offline Stewie

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Re: What's this for?
« Reply #3 on: May 08, 2020, 06:20 PM »
I would leave it in.
Only take it out to drain any oil that has collected.
You don't want to risk sucking anything into the pipe.

Offline Siberman

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Re: What's this for?
« Reply #4 on: May 08, 2020, 06:52 PM »
Ah, there is another pipe from the crank case which Iíve left connected to the crank case. The one in the picture doesnít go anywhere. It was bent double and has this odd metal blanking plug in the end with a spring clip holding it in. Just struck me as odd. I mean I probably wonít be able to sleep tonight because of itís oddness!
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Offline Gustavo

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Re: What's this for?
« Reply #5 on: May 08, 2020, 09:51 PM »
*Originally Posted by Stewie [+]
I would leave it in.
Only take it out to drain any oil that has collected.
You don't want to risk sucking anything into the pipe.

The risk is not sucking something in, it's spilling that oil on your rear wheel.  That's why it's plugged.  You check it to see if how much oil is getting through the breather.  If it's full of oil, you need to check the crankcase breather and why so much oil is getting out.

Gustavo

Always yield to temptation, it may not pass your way again - Ken Morton

Offline Siberman

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Re: What's this for?
« Reply #6 on: May 08, 2020, 10:33 PM »
Thank you, good Sir. Is it supposed to be routed so that you can see it without undoing half the bike? Iím guessing yes, probably got folded (as I discovered) by accident?
Thanks for all the help, I can rest easy now.😄
I'm sorry, really bad reception here, you said your name was Dr. who?

Offline Gustavo

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Re: What's this for?
« Reply #7 on: May 08, 2020, 10:56 PM »
Yes, I don't have my bike here to check how mine is routed, but it's supposed to come down the left side so that it hangs between the transmission and alternator cover.  You should be able to see the lower end of the tube under that left "horizontal" frame rail.  It has similar routing as the tank vent.

Gustavo
Always yield to temptation, it may not pass your way again - Ken Morton