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1984 JR50 wont idle off choke

I cant get my JR50 to idle when the choke is off. I have adjusted the idle speed screw at many different positions and tried the mixing screw in many different positions. I have also removed the air filter and still cant get it to idle without the choke.

Posted by Anonymous on


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 3567 Answers

SOURCE: idle problem

An air leak somewhere between the carb and the cylinder can cause the RPM problem. Tighten the mounting bolts. The carb may be clean but there is still a problem on the inside. Possibilities include plugged main jet, and/or needle jet. Also an incorrect needle jet setting. You have a very sophisticated carburetor. If you have already cleaned the inside of the carb I would let the dealer check it out.

Please rate this answer. Thanks kschomig!

Posted on Apr 06, 2009

  • 148 Answers

SOURCE: cant keep idle at one rpm

First, check that you gas cable is not kink or something when you replace the tank. Also do you know the procedure to ajust the carb. Let the motor heat up and ajust the two screw. Does the choke keeps on, or have something broken. Something big is just on front of you. PAtience, you'll figure that out... It doesnt sound like something that needs to be clean here...

Posted on Aug 05, 2009

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SOURCE: Yamaha DT 125 1986 - High Revs when idling

There have an air leak between the carb and the cylinder and/or the head and cylinder. Old hard / cracked rubber fittings and O rings are usually the problem. When extra air gets into the system it leans the fuel mix and the high idle is the result. It also means the engine runs hotter. Also, cracked or broken reeds can be a source.

Posted on Aug 10, 2009

  • 301 Answers

SOURCE: bike only starts with choke on and wont idle

If your bike ran good previously - and nothing has been changed that would require rejetting or a needle adjustment, I would look for problems elsewhere. Such as:
Has the bike been stored for more than a few months at a time? If so, the carburetor jets could be plugged with fuel varnish. Only being able to start with the choke applied - and an inability to idle are both classic symptoms of this. Remove and disassemble the carburetor. Clean it and the jets out with carb cleaner and compressed air, then reassemble. Also make sure the fuel in the tank is fresh and that the fuel strainer (usually with the fuel petcock) is clean.
There are three ingredients required for combustion: fuel, compression, and a spark (at the right time). So long as you've got each of these - it has got to run.

Posted on Feb 21, 2010

  • 3567 Answers

SOURCE: I am trying to remove the petrol tank of my Honda

You didn't say for sure what year your 125 is. If it is an older bike '85, the tank has a single bolt at the back. Remove the bolt and shove the tank to the rear of the bike about 2 inches to clear the rubber mounts, then lift upward. See diagram. I haven't worked on any newer 125s but if the picture in the posting is what you have, the seat will probably need to be removed to get to any mounting bolts for the tank.


Posted on Aug 07, 2010

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Choke problem

That's an indication that the idle mixture is too lean, as the choke richens up the mixture, allowing it to run.

Your carb should be similar to this:

The AIR SCREW adjusts the mixture (rich/lean), and the IDLE SCREW adjusts the idle SPEED.

Try screwing in the AIR SCREW 1/2 a turn and see if that helps.
If not, try another 1/2 turn.

Still no idle?

Turn the screw back where it was (1 full turn) and then screw it OUT 1/2 turn, then if not, another 1/2 turn.

Once you have the mixture correct, the idle speed can be set with the IDLE SCREW.

Jan 11, 2014 | 2003 ATK 125 4-stroke

1 Answer

How to adjust idle screw on 1984 Toyota Celica supra

old car, no relic....
ok it has a carb.
and like all carbs has 2 screws
one for choke fast idle and one for no choke on (hot)
get any book on this car, its there, buy one. and RTM.

Oct 08, 2013 | Cars & Trucks

1 Answer

Gq carby revs high wont wined down under 1500rpm

Idle speed is not controlled by the mixture screws, those will need to be reset to original position so you can start it easier.

If you look at the throttle shaft, with engine off, move the throttle so you can locate both sides of the throttle, or at least one side and infer the location of the other end of the shaft. There should be a pair of screws that rest against a cam on that shaft, or the screws will be on a lever attached to the shaft. One adjusts cold idle, it will be the one resting on a stepped cam. The choke needs to open fully to move that cam/lever out of the way so the second screw can sit against the carburetor casting- which will be your low idle adjustment.

The choke thermostat coil likely needs replacement. or a metal link rod fell out.

May 03, 2012 | Cars & Trucks

1 Answer

Fast idle

The specification calls for 900 rpms for the idle speed when warm for the 1987 Dodge Shadow.

One can adjust this with a screw on the carburetor, if it has one.

If it's fuel injected the idle speed is automatically controlled.

Fast Idle Speed HOLLEY 5220/6520 Fig. 5: Turn the adjusting screw with a screwdriver to raise or lower the fast idle speed — make sure that the adjusting screw is resting against the lowest speed step 86735g04.gif
NOTE: This procedure is performed while the carburetor is installed on the engine.
  1. On 1981–82 cars, disengage the two-way electrical connector at the carburetor (red and tan wires).
  2. On all years, disconnect the jumper wire at the radiator fan and install a jumper wire so that the fan runs continuously.
  3. On 1983–86 models, pull the PCV valve out of the valve cover and allow it to draw underhood air.
  4. Disengage the oxygen sensor system connector located on the left fender shield near the shock tower.
  5. Ground the carburetor switch with a jumper wire.
  6. Open the throttle slightly and place the adjustment screw on the slowest speed step of the fast idle cam.
  7. With the choke fully open, adjust the fast idle speed to comply with the value indicated on the underhood sticker.
  8. Return the vehicle to curb idle, then reposition the adjusting screw on the slowest speed step of the fast idle cam to verify fast idle speed. Re-adjust as necessary.
  9. Turn the engine OFF, remove the jumper wire and reconnect the fan.
  10. Reinstall the PCV valve and remove the tachometer. On 1983–86 models, reattach the oxygen sensor system connector, and remove the jumper wire from the carburetor.
Fast Idle Opening MIKUNI
  1. Before adjustment, leave the carburetor alone for approximately one hour at 73°F (23°C).
  2. Adjust the fast idle opening by turning the fast idle adjusting screw to the following specified values (drill diameter):
    • 2.6L engines equipped with manual transaxles — 0.028 in.
    • 2.6L engines equipped with automatic transaxles — 0.031 in.
Choke Valve Setting MIKUNI Fig. 6: After tightening the choke cover lockscrews, cut the heads off of lockscrews A (total of 3 screws) and stake the heads of lockscrews B (total of 2 screws) with a blunt punch 86735g56.gif
NOTE: This procedure need only be performed if the carburetor is disassembled.
  1. Fit the strangler spring to the choke lever.
  2. Assemble the choke valve, aligning the inscribed line or black painted line on the tooth of the choke pinion with the inscribed line on the cam lever.
  3. Temporarily tighten the new lockscrews.
  4. Set the choke valve by moving the pinion arm up or down, align a punched mark on the float chamber cover at the center of the three inscribed lines, and secure the pinion arm with the lockscrews.
  5. Install the choke cover and tighten the lockscrews.
  6. Cut off the heads off of lockscrews A.
  7. Stake the heads of lockscrews B using a blunt punch.
Vacuum Kick HOLLEY 5220/6520 NOTE: This procedure is performed while the carburetor is installed on the engine. If the vacuum kick is adjusted to open the choke too far, the engine may stall or idle very roughly just after cold start. If it is adjusted so that the choke does not open enough, there may be black smoke in the exhaust. NOTE: To perform this procedure, you will need a hand held vacuum pump capable of producing at least 15 in. Hg (50.6 kPa) of vacuum. The vacuum kick diaphragm may be damaged if you attempt to retract it manually. You will also need a drill or dowel which has a diameter equivalent to the specification for Vacuum Kick in the Carburetor Specifications Chart.
  1. Remove the air cleaner. Open the throttle, close the choke and hold it in the closed position, and then release the throttle to trap the fast idle cam in the choke-closed position.
  2. Disconnect the vacuum hose at the choke vacuum kick diaphragm. Connect a vacuum pump and apply 15 in. Hg (50.6 kPa) or more of vacuum.
  3. Gently move the choke blade toward the closed position just until play is eliminated from the vacuum kick linkage (so that the vacuum kick is determining choke blade position).
  4. Insert the drill or dowel into the gap between the upper edge of the choke blade and the air horn wall, toward the center of the gap. The dowel or drill should just fit into the gap. If necessary, rotate the Allen head screw in the center of the diaphragm housing to create the proper gap and then recheck with the measuring device.
  5. Restore all vacuum connections and reinstall the air cleaner.

Aug 05, 2010 | 1987 Dodge Shadow

1 Answer

1984 passat cl. the automatic choke runs too fast

the choke has 3 screws to adjust the unit,the choke itself will normaly be siezed inside at the age.With a warm engine, loosen the 3 screws and turn the choke untill the idle drops.

or as i did it-with a cold engine, remove the airffilter and with the 3 screws loose on the choke press the accelerator pedal just over half so the choke is engaged and the looking inside the filter housing adjust the choke flap by turning the choke housing until the flap is 3/4 closed and tighten slightly and start the car.Do remember to check your distributor timing whith a warm engine and make sure the sparkplugs and airfilter are okay as each upsets the other.

Mar 06, 2010 | 1990 Volkswagen Passat

1 Answer

How do i adjust carb on 84 cj 7 it is running rich and has some black smoke

The first thing to do is make sure that the problem is not the choke butterfly. Make sure it is opening all the way because a partially open choke can mimic improper idle screw adjustment, letting it run rich. If the choke is good then you will find the idle adjustment screws at the front of your carb. They are under the float bowl almost touching the intake manifold. This is easy to screw up so be careful and take your time. Turn both screws equally, the same way and the same amount. Use 1/4 turns and try running the engine after each 1/4 turn. Rev the engine up 2 or 3 times and let it come back to idle.If it stalls then turn it up a bit so it doesn't. You may have to adjust your RPM if it idles to low at the throttle linkage. There will be a screw stop there for that purpose, turn it in to speed up and out to slow down. It's a trial and error exercise even for professionals so take your time. Hope this helps.

Nov 02, 2009 | 1984 Jeep CJ7

2 Answers

Car will not idle

I would try adjusting the idle speed. Also check to make sure the fast idle vaccum advance is working. Check for suction at the vaccum advance. You can also always shoot some carb cleaner in there and see if that makes any difference. Hope this helps, good luck!

Mar 19, 2009 | 1984 Honda Prelude

1 Answer

I relpaced the fuel lines on my Mccullough Eager ****** leaf blow

ok then these are the low and high speed adjusting screws. first make sure the spark plug is clean of buildup or new . what you need to do is first try to get it to idle with the low adj screw. now im not sure which ones which so try one and if it makes no difference during idle then try the other. start it if it dies turn the screw , repeat this until you get the right sound and steady idle.once you figure out the low screw trun it all the way clockwise then turn it counter about 2 turns. then tune the idle from here. you want it to have a steady sounding idle. now the idle sounds good use the high screw to adjust the throttle. give it about half throttle and turn the high screw until it sounds steady here. then go to full throttle and turn high screw until it sounds steady here. now it should sound steady at idle and throttle. and try not to trun the screws more than 1/8 to 1/4 turn at a time,especially the high, you dont want to blow it up. lemme know how it goes

Nov 16, 2008 | McCulloch 26cc Gas Blower Mcb3208

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I have a 1986 pup 4 cyl,4speed.I cant seem to keep the electric choke adjusted correrctly.Is it possible tha there are problems elswere in the carb?or just the choke.

i have a 1984 pup 4 cyl 4 speed.i cant seem to keep the electric choke adjusted it possible tha there are problems elswere in the carb?or just the choke

Jul 27, 2008 | 1984 Isuzu Pickup

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