Running issue still

Marcg868 · World Chat Champion Joined: 20 Jan 2005 Karma :

Well i still have problems with my bike running like its on one cylinder, it was only idling with choke. Now the spark plugs have been changed and the carbs cleaned out and fresh petrol put in. It now idles lovely and from there up to 6k rpm it pulls and anything above it seems like its running on one and stutterin. The fuel tank petcock valve doesn't seem to be working also. Any ideas? bike is hyosung gt125r.
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JACK, MISS YOU LOADS YOU LEGEND.

hmmmnz · Super Spammer Joined: 22 Aug 2006 Karma :

i gather you have a vacume fuel tap (on - reserve - prime)
and it only runs on prime??
if thats the case then i'd assume the hose that goes from the carbs to the fuel tap has come loose or has a hole/split which in turn is giving you a air leak to the carbs hence making it run funny, and also makes it that it only delivers fuel in the prime position,

have a look at that and report back Very Happy

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Wiring Diagrams BIDNIP it bitches

SillyMe1 · Derestricted Danger Joined: 14 Oct 2010 Karma :

Check the air filter but yeah it's going to be a fuel flow issue through the carb. I guess the float chamber not holding enough fuel.

Good luck.
hyosung gt125r.

Marcg868 · World Chat Champion Joined: 20 Jan 2005 Karma :

Well when i take the tank off it pisses fuel everywhere. Normally it would not leak out of the valve thing the fuel pipes connected to.
____________________
JACK, MISS YOU LOADS YOU LEGEND.

SillyMe1 · Derestricted Danger Joined: 14 Oct 2010 Karma :

It may be the faulty fuel tap, there is normaly a fuel filter in or near fuel taps. Check it out.

Blue_SV650S · World Chat Champion Joined: 27 Nov 2008 Karma :

+1 for having a look at the air filter.
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Marcg868 · World Chat Champion Joined: 20 Jan 2005 Karma :

Air filter is one of them paper ones and it has some light oil on it. Its never been changed to be honest. Done 17,800. Looks clean.
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JACK, MISS YOU LOADS YOU LEGEND.

Blue_SV650S · World Chat Champion Joined: 27 Nov 2008 Karma :

P.addy · Red Rocket Joined: 14 Feb 2008 Karma :

I'd try the air filter also.

When was it last serviced either way... mine was a piece of crap until it was actually fully serviced.

Marcg868 · World Chat Champion Joined: 20 Jan 2005 Karma :

P.addy · Red Rocket Joined: 14 Feb 2008 Karma :

Yea take the filter out and run it as is.

skatefreak · World Chat Champion Joined: 06 Feb 2010 Karma :

Just a test run mind you to see if it makes a difference,
dont go galavanting round scotland or anything heh.

-Jvr

Marcg868 · World Chat Champion Joined: 20 Jan 2005 Karma :

Had a ride today and it's idling lovely and sounds fine. Cleaned the air filter as it's a bmc one similar to a k&n. It now feels like it's bogging down throughtout the rev range,like the engine is being flooded with fuel. Fuel lines are all intact. Just the petcock is always set to prime. Fuel floods out when I take the tank off.
____________________
JACK, MISS YOU LOADS YOU LEGEND.