Question about Honda CB 250 Motorcycles

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We have a 250 kazuma go-kart and the fuel is getting to the carbs but isn't getting any further. Manually choking (with hand) just gets it to start but it wont keep running. there is no fuel getting through the carbs. Any advice on this problem will be greatly appreciated.

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Sounds like the carbs have blocked jets or are in need of setting up.
I would start with the main jets, cleaning or replacement.

Posted on Mar 28, 2011

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Posted on Jan 02, 2017

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1 Answer

2007 Kymco exciting 250 with a brand new carb from the factory will not start. Have spark, gas in carb bowl and good compression. Checked timing all is good.


indicates that the air/fuel mixture screws need adjusting
normally they have a c generic setting from the factory and need further adjustment when fitted
make sure that the choke system is attached and working

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Hi I have a Kazuma 90cc. The choke linkage broke which I have since repaired. When I start the bike now it idles high and if I adjust the idle screw or fuel mix screw it has no effect. Any ideas? Thanks


Hi, My guess is that when you put the cable back in to the carb, It was not put in correctly. Thusly making the bike run high. There is a groove in the cable end and it must line up with a knotch on the carb.
After you do this you may have to reset the carb idle and fuel mix. Good Luck

Feb 04, 2015 | Motorcycles

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I have a 250 Kawasaki motor in a kart. I can not get it to start. It was running perfect then a week later I could not start it. Plenty of fuel in the tank and getting through to the carb's. Plugs are dry...


Compression release stuck open? Do the plugs show spark? Is the slide in the carb moving up and down when you turn the throttle? Soak the carbs in denatured alcohol for 30 minutes, then clean them with spray carb cleaner. Remove the air screw and throttle screw on the carbs and spray into the holes. Reassemble and LIGHTLY seat the screws. Now open each one up one and one half turns. This is the factory setting. Install an in-line fuel filter to keep trash out of the carbs. Is the exhaust clear? Is the air filter clean? Some bikes have an oil level sensor > is the oil level in the gearbox where it should be?

Dec 31, 2009 | 1995 kawasaki ZL 250 Eliminator

1 Answer

Carb have issuse .runs with choke out but spits an spuders with it in


hi buddy the choke allows more fuel in the engine on start ups this is lack of fuel try fiddling with this mixture screw below till it runs ok and get back to me
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Oct 04, 2009 | 2004 Yamaha YZ 250 F

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My 86 f250 460 engine has hard time starting; New fuel filter, rebuilt carb, new plugs, new dist cap and rotor... i have to pump a few times, crank,,,, pump some more and then crank again for it to start


Check the choke in the carb, might stay stuck in the open position when engine cools down. After the engine is cold, check and see if the choke is closed, if not close it by hand, and see if that works.

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Gas in oil - Yamaha Virago 250 2006


your carb. is flooding the cylinder when its not running.it will cause ring damage.turn your gas pitcock off when not in use.get carb cleaned &adjusted.

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2 Answers

J.D snowmobile 340 73 carb wont idle appears internally clean.


I would have your compression tested, if its a two stroke, and you can use tools with out breaking things or yourself, pour a cup of fuel down the left hand side of the carb and take the right hand side of the carb off and crank it like mad, if fuel leaks from there you better get to a repairer.

other wise the idle adjuster is usually on the left hand side where the accelerator linkages are, it will be a screw where the linkage touches when the throttle is closed. not too hard to find if you have a light source.



Hope this helps.


If you want any more help just ask :)

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4 Answers

Yamaha kt100 kart


I've never seen a KT100 before, but i've worked with similar engines.
The fuel isn't gravity fed. It uses a pulse pump system using diaphragms in the carburettor to sort of "**** and blow" the fuel using pressure impulses and valves to stop the fuel going backwards.

The first place you should look is if there is a short pipe from the crankcase to the carb so that the pressure pulses from the case can move the diaphragms. You should be able to see this from some pics on google images. If thats all ok, you should check if the carb is perfectly clean. If its still giving you problems, change the diaphragms in the carb. You should be able to get a replacement rebuild kit from a dealer.

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