2005 GV250 Running rich
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Bike Model = : GV250 2005
Hey all, I have a 2005 GV250 that seems to be running way too rich. The CR8 plugs in it are consistently wet when I check them. Carbs were cleaned last year, fresh gas, decent spark. As far as I can tell the Carbs are adjusted as well as they can be. At idle when cold I have visible fuel vapor from the exhaust. It clears up when warmed up, but you can still smell the fuel. I find it hard to believe that it would be running this rich normally.
If anyone has any ideas, I would love to hear them.
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What size Jets does it have ? Pilots and Main Jets ?. You could be over-jetted or the coils & caps are wanning (not as punchy as before)
// Meditation doesn't mean you have to sit still....
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What size Jets does it have ? Pilots and Main Jets ?. You could be over-jetted or the coils & caps are wanning (not as punchy as before)
I’ll be completely honest, I have no idea what size Jets. Spark seems good.
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What size Jets does it have ? Pilots and Main Jets ?. You could be over-jetted or the coils & caps are wanning (not as punchy as before)
I’ll be completely honest, I have no idea what size Jets. Spark seems good.
It is worth opening the float bowls and taking a look and let us know, and this will be a sure thing for you too, it may idle fine but as the road speeds go up, it may bog down more as it has too much fuel or otherwise try to get a meter out and test your coils with actual figures.
Ignition Cap Resistance (under 50,000 ohms) without the coil attached, just the cap. But i wouldn’t trust OEM caps to save my life anyway, so best to use NGK caps.
Ignition Coil Resistance (without the cap attached)
– Primary Ohms and
– Secondary OhmsIt could save a lot of guess work.
// Meditation doesn't mean you have to sit still....
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Main Jets are 87.5 front and 90 rear. I think the pilots are both 02 if that makes sense. Intakes post-carbs are full of fuel, so perhaps floats are adjusted wrong? I don’t think it’s a spark issue since it runs fine once warmed up and the only real symptom was excessive fuel vapor/smell in the exhaust.
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I have a 2005 GV250 that seems to be running way too rich. The CR8 plugs in it are consistently wet . Carbs were cleaned last year, fresh gas, decent spark. At idle when cold I have visible fuel vapor from the exhaust. It clears up when warmed up, but you can still smell the fuel.Quote
My 2008 Gt250R also ran rich, even before i put 90 & 92.5 JETS in the carbs. Jets are super easy to swap over, just unscrew them & screw a replacement in.
1. Did you put new FLOAT-VALVES in the carbs? Very easy to do. Keep your original FLOATS as their height should be good, but change the float-valves if they not new.
2. I removed the AIRBOX completely from my bike. I put 2x AIR-FILTER PODS on the top of the carbs. Fixed the rich running bike, sounds freaking aweome & i have all this room under the tank for more air-cooling & i intend to put some HEAT-INSULATIUON under the tank to keep my fuel cooler.
3. I had great success smoothing out the fueling by TURNING the IDLE SPEED DOWN to about 1100RPM’s. The manual says to set them to 1400-1500 RPM. But i found if you lower the idle speed the bike is much smoother acceleratiing throughout the entire rev range. The only problem is it makes the bike a bit harder to start. But only because i don’t use CHOKE to start the bike – the choke floods the carbs at the slightest touch. My carbs were toast & i haven’t fixed the choke but the bike runs well.
My carbs are not great but they were really bad and caused big FUEL Leaks into the carbs & into the airbox. I never fully fixed the carb issues – they still leak a little fuel into the air-filter but i can redline my 250 now and get about 150+km/h so it’s not bad.
I bought a Chinese dual-carby to try out, but the throttle is not in the same position so it may not be able to use it.
-----LaserBeam---->
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Jake C i adjusted mny idle speed to between 1100 to 1200 RPM at idlle when the engine is WARM. Closer to 1200RPM will probably suit most. If i put the idle to 1500 RPM it makes it hard to shift the gears into NEUTRAL. Lower revs at idle fixed that and it uses less fuel sitting at the traffic lights.
Your bike may just need more air into the carbs but i would replace the 2x FLOAT- VALVES and give the carbies a good spray with CARB-R-CLEAN by CRC or similar product.
-----LaserBeam---->
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For GV250 , it should be 92.5 and 95 mains. (This is even OEM size for 250 GTR too) , but measure your coils and caps , your sparks may not be optimal at the higher rev range.
Intakes post carb should be dry, so you MAY need to replace the float seats and float pins. The float seat has an O-Ring that causes internal carb leaks even if the bike is turned off.
Too much fuel dripping down the cylinders overtime is not good for piston rings & your oil will definitely stink of fuel next time you change it but i would change the oil now and oil filter as a pre-caution.
// Meditation doesn't mean you have to sit still....
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