Question about 1989 Suzuki RGV 250 K

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Over fueling front cylinder RGV 89

Have since replaced reeds with carbon type and leaned out droping the needle on the carb by one slot any ideas guys ?

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Sometimes changing to carbon reeds is a bad idea if leaning out fuel and using a higher octane fuel. Carbon reeds sometimes get weak after leaning out fuel and this may be your trouble with the leaning idea and using these reeds. So this may be the things to consider on the over fueling try this and let me know.

Posted on Feb 04, 2009

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Depends on the type of carb, but you must remove needle and there is a sir-clip with slots on the top of the needle. it can be poped off and moved up and down on needle. may have 5 different spots on it. Factory setting will be the center slot. This will enrich the mix or lean it out.
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When i let off the gas to slow down a little then want to speed back up, the bike coughs--- gets worse the colder the air temp is. i replaced the gasket between the carb and intake because there is...


It sounds like the typical "lean from the factory" problems but let's check one other thing first. Take ht air filter off the bike leaving only the backing plate on it. With the engine OFF, crank the throttle wide open. When you do this, you should see a shot of fuel squirt from the brass nozzle in the mouth of the carb. This is the accelerator pump. If you don't see a shot of fuel squirt into the carb, the pump diaphragm is bad or there's trash plugging the hole that lets the fuel get to the pump.

If you do see the shot of fuel, you may simply have a carb set too lean. I'd go with a #48 or #50 slow jet in the carb. Maybe add a 0.020 inch thick washer under the needle to raise it up just that little bit enrichening the mid-range.

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Hi I recently bought a Kawasaki kdx 80.I've been riding it for about a week and has been fine,but a few days ago I filled the tank with premix 35:1 I think and not saying that's what did it but since then...


Black dry deposits are indicitive of a very rich mixture. On your two stroke, rich is a asset but you can go too rich. It sounds like for some reason you're getting too much fuel.

I think I ran into something like this before on a Kawasaki 80. Check the screws that holds the choke plate inside the carb. They will come loose and allow the choke to close on you while riding the bike. If the screw comes out, it will go into the engine and cause serious damage. If the screws are loose, them out one at a time and put a drop of Loctite 271 (red) on them and reinstall them.

Check the float and the needle and seat to make sure that you don't have any trash in the needle and seat. Also check your tank vent. If the tank builds up vacuum, you could be running out of fuel. Sounds funny that you can be running rich but run out of fuel. The problem is that you run out of fuel so quickly that the carbon from the rich mixture doesn't have time to burn off.

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Aug 25, 2010 | kawasaki KDX 125 Motorcycles

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1973 Yamaha RD 250 - The engine RPM's are revvving out of control. Even when I turn the key to the off posistion it takes a while to shut down. The throttle cable seems to be in good working order.


Remove the cylinder heads and de-carbon the heads and top of the pistons. Hot spots of heated carbon buildup are igniting the fuel after the key is off. Install new spark plugs > NGK B8HS. This will fix the continued running problem.

The out of control revs is an air leak problem. Un-carbureted air is making the fuel/air mixure lean. The hose clamp at the front of the carbs may be loose and/or the gaskets from the reeds to the cylinder are no longer keeping a good seal. The carb joints and reed gaskets should be replaced. The gaskets are cheap. The carb joints are expensive. Considering this, you may want to put some gasket sealer on the carb joint mating surfaces and see if they will seal up okay. If the carb joints are cracked, you pretty much have to replace them. Please rate my answer, thanks.
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1996 gsxr750 sat for 8 years. No start, cleaned carbs,fuel tank. fresh fuel. now it starts but not very well. #1 cylinder seems to run very lean(put a rag over air horn, smooths out). Exhaust tube...


did you run needle in the jet while you where clean carbs?? as you need to remove the air fuel screw if didn't already. spary carb in the air fuel screw hole and make sure it come out the pilot hole and in the carb mouth. i have lint from a rag block a pilot jet before to. and yes sycnhonieing the carb will help after you get all 4 holes banging.
Mark
C.C. Motorsports

Mar 18, 2010 | 1996 Suzuki GSX-R 750 T

1 Answer

My 1985 bayou 185 will bog down and not have much power at top end and it also idles high I just bought it the guy said it has new rings,intake valve and head gasket need help


Chances are the the rubber seals on the intake manifold are hard and have micro cracks that let in outside air after the carb. This leans the fuel mix and causes the fast idle. It also limits power as a lean mix going into the engine. I suggest replacing all rubber and seals between the carb and the cylinder. Also, remove the air screw and throttle screw then clean the carb. Soak it for 30 minutes in denatured alcohol then clean with spray carb cleaner. Be sure to spray into the air and throttle holes and every other drill hole you can find. Spray from both ends of the curcuits. LIGHTLY seat both screws then open each screw one and one half turns. This is the factory setting. Before putting the slide back into the carb, move the clip on the jet needle downward one notch. This will help with the bog. Please rate my answer, thanks.

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1 Answer

Dead pw 50 and sad boy.


Many things could cause the problem. Let me see if I can help out.
You have spark, but is it enough spark? A weak battery can rob power from the coil so only a weak spark is present. Get a new stock NGK spark plug to eliminate the possibility of a problem plug.

It is good that you cleaned the carb because that would be my second target. Reset the air and idle screws. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Clean or replace the air filter and be sure the bolts are tight on the carb manifold. INSTALL AN IN-LINE FUEL FILTER. Let the float bowl fill then start the engine. Set the idle speed with the idle screw.

Remove the cylinder head. run the piston down to the bottom of the cylinder. look inside the cylinder. On th carb side (intake) you will see an intake port > a large hole that lets gas into the cylinder. Now look at the exhaust port. It is possible the exhaust port is pretty plugged up with carbon. The intake and exhaust ports should be approximately the same size. Are they? If not then remove the muffler and take a screw driver and plastic hammer and knock the carbon into the cylinder, thus enlarging the exhaust port to its' proper size and allowing the exhaust gases to escape. Vacuum the carbon out of the cylinder. De-carbon the piston top and the cylinder head.

Get back to me and tell me what you find. If more is needed we will go further.

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1 Answer

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