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Which is considered the low speed jet in a Makuni carb. (225 moto 4)

Have yet to check valve clearance. Still working on trying to get to run past and idle..

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  • Randy Oct 30, 2012

    Yup helped knowing where to look but find spark just not right and now believe CDI unit to blame. Thanks for your inputs...

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  • 342 Answers

Its the small jet usually recessed in the carb body very important to make sure that jet and passage way is not blocked.

Posted on Oct 28, 2012

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Posted on Jan 02, 2017

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SOURCE: 1981 gl1100 has 4 keihin carbs bike sat 7 years

39dcb9a.gif5ab3c33.gif
648d54b.gifWhen removing the pilot jet screw, count the number of turns to remove. Put the screw back the same number of turns then unscrew 1/4 turn.
A “very helpful” rating on this answer? Thanks!

Posted on Jul 02, 2009

  • 9 Answers

SOURCE: 2005 yamaha yzf 250-unstable idle

I had the same problem, Turns out that my shims were finished, replace the chims and check clearences.

Posted on Mar 12, 2009

haider_alhar
  • 90 Answers

SOURCE: 2002 suzuki LS 650 running lean at higher speeds, (off idle)

this prob happens allways in carburated engines that the car or motorcycle is running lean or rich . because the air - fuel mixture ratio is not right . so you should open the carburator and remove the air filter you will find two screws in the lower front section of your caeburator. you can adjust them by a screw driver until your car is smooth

Posted on May 31, 2009

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Makuni carbs


not necessary----if you have the right pre-mix you don't have to change the jetting.

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My Yamaha 225 moto4 starts but can not get better than an idle to happen then stalls.


How long was the moto4 sitting? and did you pay close attention to the low speed jet that it is not blocked, the most common problem is the carb if the unit has been sitting for long period of time and the small jet will be blocked so you need to make sure its clear.

Oct 25, 2012 | Motorcycles

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2001 ttr 225 bike sat all last year. Would start this spring but not idle. Now it won't start. I know the carb had old gas. Where can I find a manual so I can take it apart and know what parts to...


Start by removing and cleaning the carb, it may not need any parts.
also change the oil, fit new air filter, new spark plug, and check the valve clearances

May 27, 2011 | 2002 Yamaha TT-R 225

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Hi (.honda cb 400-4) float posts damaged on original carbs.so replacements stripped & cleaned out i also fitted new jets adjusted float heights.to 21mm or 22mm (miss informed by a haynes manual).valve...


Were the jets the same size? Just because the numbers were the same does not assure you that someone has not used a jet drill to enlarge them. Pull the low speed jets and compare them with the old ones, using a wire gauge or set of number drills.

Apr 02, 2010 | 1975 Honda Cb 400 F

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Have a suzuki 900 rf 900 when you give it gas it bogs down then picks back up and runs good have checked the carbs and intakes look fine


Sounds like a lean condition. Particularly a transition from a lesser jet to the main jet in the carbs.
Depending on how severe the problem is it could be as simple as adjusting the the main jet needles and synchronizing the carbs and richening up the idle air screw a bit.
Remember that all general service basics should be checked before adjusting carbs. Valve clearence, spark plugs, air filter, cam chain tension, etc. should all be checked/ adjusted/ serviced/ replaced before adjusting a carb.

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Engine will not run at steady speed, govenor continually fluctuates , This engine is a Kawasaki FC420V-ES10 on a John Deere Riding Tractor Model LX176. I tried the mixture adjustment needle valve no help.


On top of carb you will see a jet that is slotted,remove with screw driver and use a very thin wire to clean out hole in jet.Some had a black metal clamp holding it in place,remove that one by removing phillips screw,black clamp then use small pliers to pull jet out of top side of carb.If this does not work remove carb bowl and jetting in bottom-center of carb and clean jetting holes with a small copper wire.The mixture screw is for low speed air/fuel mix,this engine does not have a high speed fuel screw.Fixed jet.

Dec 11, 2009 | Garden

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I have a 2006 kx250f engine seems to be running fine but at 1/4 throttle engine seems to be bogging or missing a bit


I would start out with the basics first: clean air filter, new spark plug, fresh fuel. Then move to the intake and exhaust and check for leaks. A loose carb or adapter, a leaky exhaust seal. The exhaust uses a copper ring seal, they have a tendency to wear out or be vulnerable to a header that has been knocked out of alignment. If everything still checks out, try cleaning the carb, and be sure to remove all jets and blow compressed air through all passages. Next I would check for valve clearances, and if your capable, a leak-down test to check for a worn top end or valves. If the problem has seemed to be for most of the bikes life, you may want to try rejetting the bike to fine tune your low-speed circuit.

Jun 18, 2009 | 2002 Yamaha TT-R 250

1 Answer

Hard starting;has stock jets.


Install a new stock spark plug after getting the compression checked and the valve clearances checked. Assuming good compression, use the choke when cold starting but don't flood the engine. Clean the air filter? If, when running, the bike dies when the throttle is turned, remove the jet needle from the throat of the carb and move the clip on the needle down one, possibly two, notches. This will richen the low end mix.

Jun 01, 2009 | 1995 Honda XR 250 R

2 Answers

Kawasaki gpz 1000 rx 1987 model


Running well at high revs would indicate that all the fuel and air it needs are getting to the engine and you also have a good spark. Probably no problem with air and fuel filter ( if fitted) or sparkplugs.

Running hot, and bad idling are signs of a lean air fuel mixture. The engine is probably not getting enough fuel at low revs.

This could be caused by an air leak between the carburettors and the engine. Check that the vacuum line to the fuel tap is properly secured at both ends. It is behind the fuel line at the tap.

Get a a short length of hollow plastic tube and use it like a stethascope - put one end to your ear and move the other end around your carburettor mounts with your engine revs as low as you can get, and listen for any sucking noises that would indicate a leak. Look for cracks in the rubber inlets.

The other possibility is that there is an internal blockage in the idling jets or idling fuel circuit. This is where dirt tends to lodge because the jet dimensions and passageways are very fine - The high speed jets are much bigger and dirt often just passes straight through.

Try a little bit of choke while the engine is warm to see if you get a stronger low speed response. If so that would point to an internal blockage.

Jan 24, 2009 | 1987 kawasaki GPz 1000 RX

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