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| "KRS/GT" Technical Q&A K1200RS/GT Technical Questions/Answers |
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#1
08-08-2018, 07:22 PM
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Gas pouring out vent tube when filled
Just inherited my fater-in-laws (mkem) k1200rs. He had an issue that we thought was fixed. When the bike is run and you fill up to 5he top, close the gas cap, it starts splitting gas out of the vent tube. I know the filters have been replaced, etc.
. Any ideas what could cause the pressure to build enough to pour out the tube? Thx in adavance
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Jason 2012 K1300S magma red converted to flat black / aluminum, back to red and black 2002 Black K1200RS (MKEM's bike, inherited.) Bike is strong, he is gone but never forgotten 2008 K1200S Tri Color / Power Commander III Quick Shift *rebuilt title (wife's bike) (sold) 2002 Silver K1200RS M-sport Roundel (sold) 2005 GSX-R 600 *sold to buy the k12s Web Designer / Internet Marketing / network marketing |
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#2
08-08-2018, 07:48 PM
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Re: Gas pouring out vent tube when filled
Yea, common overfill! Especially placed on its side stand in the heat.
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If you want something in your life you've never had, you'll have to do something you've never done." Tuono V4 1100 Factory 2016 04 k1200RS Zebra.Sold  07 R1200GSA 01-SOLD K1171RS05 R1200GS...SOLD 06 K1200R..SOLD..so long! Learn something or simply find entertainment on i-bmw? Then why not consider supporting us via a donation? See the "Donate" link on the NavBar in the middle of every page! Do it now NON NEONS  . Thanks!
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#3
08-08-2018, 08:40 PM
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Re: Gas pouring out vent tube when filled
Particularly if the engine is hot, and compounded if its a hot day, gasoline when hot will expand, and parking the bike on its side stand doesn't help if its hot. Don't fill to the very top.
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#4
08-08-2018, 10:03 PM
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Re: Gas pouring out vent tube when filled
The football shaped "float" attached to the vent pipe is probably sitting too low in the tank.
Easy to bend the pipe when reinstalling the filler flange,that thing is hard to install particularily as one tries to keep the gasket in place. Fix? I pulled the fuel gauge out and used a pry bar to push the float/vent pipe up against the top of the tank. Full to the brim on sidestand?Haven't seen a drop out of the pipe in years.And yes it did pour before I fixed it.Enough to fill a tuna can in a few minutes.
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Benelli 50cc at 14 Yamaha RD200 at 16 Yamaha RD350 at 17 Honda CB750F at 18 Honda V45 Sabre at 24 85 BMW K100RS at 28 (Very nice and sorely missed)  90 BMW R100GS at 34 (Too slow, too cranky)  2003 K1200 RS at 53 (Oh Yeah......over 6000RPM) 
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#5
08-08-2018, 11:13 PM
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Re: Gas pouring out vent tube when filled
Thx all. Never had an issue with my previous krs. I will look at these options. At least I dont mind the smell of gas coming from the garage. Gotta love the KRS head scratchers. Almost forgot what it was like
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Jason 2012 K1300S magma red converted to flat black / aluminum, back to red and black 2002 Black K1200RS (MKEM's bike, inherited.) Bike is strong, he is gone but never forgotten 2008 K1200S Tri Color / Power Commander III Quick Shift *rebuilt title (wife's bike) (sold) 2002 Silver K1200RS M-sport Roundel (sold) 2005 GSX-R 600 *sold to buy the k12s Web Designer / Internet Marketing / network marketing |
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#6
08-09-2018, 05:36 AM
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Re: Gas pouring out vent tube when filled
Another possibility is the float which is made in two halves and can split at the horizontal seam. I know this - it would fill Pierre's tuna can in seconds on a hot day! Once it splits, with a full tank the fuel expands on a hot day and quickly fills the float with fuel. A closed fuel cap will allow it to syphon out the drain tube. Opening the fuel cap will stop the flow immediately but the long term fix is to repair the float with fuel resistant glue or replace the float.
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Current rides: 2002 K1200RS. Owned from new. Pacific Blue, Ohlins, Speiglers, Fiamms, HID, Factory GT heated seat. 172,000km  1991 K1. Schwartz metallic black, fully restored. 74,000km SOLD 1987 K100RS Style. Black, Ohlins, Race Tech springs, Braided lines. Fully restored. 53,000 miles. SOLD The family history: 1951 AJS 500 single - my Dads ride 1953 Triumph Terrier - my Mum's ride 1916 Triumph Type H, Battle of the Somme, France WW1 - my Granddads ride |
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