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Author Topic: hyosung gt125r  (Read 767 times)

richard booth

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hyosung gt125r
« on: April 11, 2016, 02:55:16 PM »

hi i have just bought a 2009 hyosung gt125r and there is like a valve / pump (think its called a secondary air pump) that is disconnected there is 1 pipe that seems to come from the crankcase upto the pump, another pipe that look like it goes to the air box and another pipe with a tee piece on but not sure there this goes?? does it go to the carbs??
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Cloud

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Re: hyosung gt125r
« Reply #1 on: April 11, 2016, 03:42:46 PM »


Still got the RX, or did that go?

I think the thing you're talking about there is the PCV, which uses a little of the engine vacuum at the intake manifolds, to draw oil vapour from the crankcase. I've been told it's an emissions thing but quite why you'd put all that steel and rubber into making something that extracts a tiny breath of vapour from 14cl of oil, I don't know. I think it's possibly about condensation.

If it's that (and please make sure it is before you attempt anything) then it should have basically a hose from the intake rubbers, a hose to the other fuel thing, and the big one down to the crank case.

Otherwise, you can attached a crankcase breather filter to the crankcase vent (where the big pipe goes) and then completely take out the little valve thing, by putting a hose directly from intake to the other thing.

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richard booth

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Re: hyosung gt125r
« Reply #2 on: April 11, 2016, 04:41:23 PM »

the rx has long gone mate lol got my dream bike now lol the gt125r

here are some pics just not sure where the tee piece connects???



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Cloud

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Re: hyosung gt125r
« Reply #3 on: April 11, 2016, 04:49:14 PM »


What the fxxk is that?

Ignore everything I said. No idea.
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richard booth

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Re: hyosung gt125r
« Reply #4 on: April 11, 2016, 04:55:10 PM »

lol does sound like some sort of valve for the crank case pressure / vapor ??? i tried google it and the only think similar is a secondarily air pump??
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Re: hyosung gt125r
« Reply #5 on: April 11, 2016, 04:56:02 PM »

AIS. So Air pump is correct.
Pumps air into the exhaust to lighten emissions. Check to see if the pipes at the base of the cylinders have been blocked off.
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richard booth

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Re: hyosung gt125r
« Reply #6 on: April 11, 2016, 07:24:22 PM »

just wondring how it all conects together does anyone have a diagram?
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Joss

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Re: hyosung gt125r
« Reply #7 on: April 11, 2016, 08:28:46 PM »

I'll be able to dig you some photos out tomorrow of where they all go.

You have the larger two pipes correct, off the top of my head I think that T piece is for vacuum off both inlet rubbers but let me double check.
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richard booth

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Re: hyosung gt125r
« Reply #8 on: April 11, 2016, 08:35:13 PM »

thanks mate apriciated it looks lke 1 big pipe comes from the crankcase to this valve thing the. other goes to the airbox and the tee piece no idea lol
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Joss

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Re: hyosung gt125r
« Reply #9 on: April 12, 2016, 05:20:31 PM »

Ok without the side fairing off I can't get you a photo but I've traced them for you.

Big hoses: top of the ais goes to the air box. The bottom goes to the ais plate off the engine. You have those correct.

The smaller vacuum hose from the ais valve goes to the side of the carbs on the left of the bike near the tick over adjuster. It then enters the t piece bracket where:
1) runs to the fuel pump vacuum nipple (the bottom nipple,  crouched near the tick over adjuster).
2) runs to the inlet rubbers to another t piece where they both go to either inlet rubber.

Any problems let me know.
« Last Edit: April 12, 2016, 05:22:45 PM by Joss »
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