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Yamaha rxs100 carburetor emitting petrol from bottom pipe

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Yimtaka
L Plate Warrior



Joined: 27 Jun 2022
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PostPosted: 21:44 - 27 Jun 2022    Post subject: Yamaha rxs100 carburetor emitting petrol from bottom pipe Reply with quote

Hello everyone here, i am a new member, i recently purchased a yamaha rxs100 1990 model.
When i bought it, it was running but after leaving parked overnight it is refusing to start. I am willing to put the effort in just need pointers on what area to focus on. I noticed that there are 2 open tubes on the carburetor, one at the top and one on the bottom side, i think the top one is overflow?
Not sure what the bottom side one is but if i turn on the fuel then ever 5 seconds or so i get a small spurt of petrol out of it. Any hints tips or advice please? Thanks in advance.
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 22:05 - 27 Jun 2022    Post subject: Reply with quote

Most likely a sticking float. Try giving it a few sharp taps on the float bowl with a piece of wood and see if the fuel spillage stops. If it happens repeatedly, you may need to strip and clean the carb, paying close attention to the condition of the needle valve and seat. Some needle valves become corroded when you use fuel containing ethanol or they just become dirty from disuse.

Also check fuel hasn't overspilled internally into the crankcase, it may be worth removing the plug and kicking it over a few times.
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I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.
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Yimtaka
L Plate Warrior



Joined: 27 Jun 2022
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PostPosted: 23:57 - 27 Jun 2022    Post subject: Reply with quote

Thank you very much for your advice, i shall give it a go.
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Mysteriass
Nova Slayer



Joined: 06 Apr 2015
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PostPosted: 18:45 - 28 Jun 2022    Post subject: Reply with quote

Oh, an RXS is leaking from the carb... I can't believe it.

They all seem to do that.

As stinkwheel said, tap the bottom of the carb, the float bowl, and that'll usually unstick a sticky float. I think the carb body becomes microscopically distorted after so many years but the pin doesn't distort with it. That causes the stick. Maybe. It's mainly a problem in the winter but it's one of those old bike niggles you can get used too.

Also get used to turning your fuel off at the tank every time you stop for any period of time - especially for an MOT when it's guaranteed to piss down the guys leg and aggravate him (Probably a fail these days). If your fuel tank petcock is bust - which it probably is - then put an inline fuel valve (and filter) on your fuel pipe because good luck trying to buy a new aftermarket petcock that's any better than the thirty year old one you're replacing - https://www.ebay.co.uk/itm/144186613878

In the carb, there's a paper seal on the needle valve seat and they can leak which keeps filling the carb and causing issues like this, including a rough idle, get a new one of those seals too (Or at least turn the old one upside down and that might fix it for a week or two). Entire carb rebuild and clean is probably in order.

It's also fun getting that rubber from the airbox off and on the carb the first few times. You have to kind of put it at an angle and twist it on how it's supposed to be, takes seconds once you've got the knack.
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Yimtaka
L Plate Warrior



Joined: 27 Jun 2022
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PostPosted: 18:50 - 28 Jun 2022    Post subject: Reply with quote

Thanks for all your advice, especially about the nuances of taking it apart and putting it back together. I have ordered a kit for the carburetor so once that arrives will do a full clean and fix.
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