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I have a jcb 5.5hp lawnmower, its starts with the choke closed, but as i open it, a begins to stop, it never use to do this, it always ran, when i opened the choke up, fuel is good

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The choke should not be engaged when you are running your mower, it is only for starting cold engines and will choke you mower out if you open it up during operation. Only the throttle should be used to increase rpms

Posted on May 06, 2010

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Cold choke baffle has 3/16 opening minute I pump accelerator choke thermostat closes primary baffle shut no air to start I force choke open to start why insufficient air to run at high idle?


Your engine probably has an automatic choke device that adjusts automatically with engine temperature. To set the choke when the engine is cold you have to depress the accelerator to the floor and release it completely. You shouldn't have to depress the accelerator again to start the engine, turn the key the engine should start. As the engine begins to warm up it will also begin to initially run faster then it will start to run rough. At this point you have to press the accelerator and release it again. The auto choke mechanism should allow the choke butterfly to open. There may be a number of stops in the system and the choke butterfly will stop again still not fully open and only become fully open when the engine is at operating temperature. Hope this answers you question, Rgs. Bob

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Where is the choke


Many Briggs engine have a primer rather than a choke, the 675 series has a choke that is worked by an air vain, the choke is always closed when the engine is stopped, once the engine starts air pressure from the flywheel pushes the air vain which in turn opens the choke to allow the engine to run normally, there is also a version with a bi thermal switch on the back of the muffler, as the muffler heats up the switch opens the choke.

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Engine starts but won't continue to run. Choke doesn't stay closed after starting. will stay running only if I hold choke closed manually.


let it warm up with choke closed manually after it starts to stall with choke closed open it and dont let it stall u can learn to play with the choke a little to get it to run right GOOD LUCK!

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I have a 10 year old Mastercraft Canadian Tire 4.0 HP rear bagging lawnmover - always started great and ran great but now after it starts it keeps choking out. I changed the spark plug and the same...


You may just have some bad gas. try draining the system and putting fresh in. I usually drain some of mine into a glass jar and let it set for awhile. that way you can tell if there is any water in the gas.

Aug 20, 2010 | Garden

1 Answer

Lawnmower w/auto-choke stops when choke closes


Hi an welcome to FixYa. I am Kelly.

What has happened is that when the system cavitated the engine drew debris into the Jet orifice in bottom of the carb. You will have to remove the float bowl by removing the 4 mounting scres and the bowl nut.

Once you have the bowl off the Jet / Orifice is located in the very bottom of the carb. It will be recessed about 3/8 inch inside the ventrui. It is BRASS. It can be removed with a flat bladed screwdriver. When you get the jet out hold it up to the light. You should see a pinhole in it. No light.. JET is clogged. Just clean it and reinstall it.

After you have cleaned the jet... take a l;ook at the bowl nut. There are 2 holes in the side of the nut assy that must also be clear. Before you re-install the float bowl turn on the gas and gently lift the float \ensuring that fuel flow stops. Then as you let the float down it should pass fuel. If you do not have feul flow at this point then check the gas tank outlet for obstructions. Once you have established fuel flow reinstall the float bowl, nut and mounting screws.

It should work just fine after this.

A word to the wise.... DO NOT disconnect any linkages unless you have to...! Take a digital picture of the link connections BEFORE you remove them. Thrust me you will be glad you did!

Thanks for using FixYa,

Kelly

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1 Answer

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sounds like the carb needs a cleaning could be gummed up from old gas...good luck

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1 Answer

My troybuilt yard pony riding lawnmower will start with the choke fully open and then dies immediatly when you take the choke off. It will only start and run with the choke fully open, but dies after 20-30...


Do you mean that you can start it normally using the choke (that would be choke CLOSED), but then it dies immediately when you move it to run (that would be choke OPEN)? And if you leave the choke in the starting position that it dies after 20-30 seconds?----- If I have that all right, then you definitely have a restriction in the gas supply. Drain all of the gas from the mower and don't use any old gas. If you have any more old gas (from last season) don't use it. If this mower has a gas filter, replace it. Put just a little fresh gas in the tank plus a little of the cleaner. Start it up, do that a few times if needed. Use a fuel additive such as Sea Foam to keep the gas from gumming up so fast.

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1 Answer

Mcculloch 3516 chain saw, does not always start.


It must have spark, fuel and compression to run. Your task is to figure out which is missing.
Sometimes electrical components quit operating once beyond a certain temperature. Does it always start cold and become tempermental when warm?
IMO most hard start problems on a chainsaw with a good fuel delivery system are flooded.
Start Procedure
Cold:
  1. Ignition on/off to on
  2. Set compression release – optional step even if saw is equipped with a compression release
  3. Pull (close) choke, set fast idle (done when choke closed on some saws); pull starter and listen for an attempt to start. once heard (usually two pulls; no more than 4)
  4. Set compression release – optional step even if saw is equipped with a compression release
  5. Push (open) choke pull starter until it starts. (usually first pull)
Warm:
  1. Ignition on/off to on
  2. Set compression release – optional step even if saw is equipped with a compression release
  3. Pull (close) choke, set fast idle (done when choke closed on some saws) - Don’t pull with choke closed.
  4. Push (open) choke, pull starter until it starts. (usually first pull)
The 3516 is a MTD McCulloch (Chinese). These saws are in a class by themselves. Good Luck
Lou

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1 Answer

Craftsman eager-1 lawnmower will not start


Hi, The first thing I always check for is fresh fuel (less than a couple of months old) old unleaded may well be fine in your car but low compression engines fitted to garden equipment need fresh fuel. next thing to check is that the choke flap is closing fully, dont rely on the position of the control lever, remove the airfilter cover and see that the flap is fully closed, if it's cracked open just a little bit it will stop engine starting ( unless the filter is really dirty) another thing to check is that the blade is tightly secured, on direct drive mowers the blade acts as a flywheel. did you hit an obstruction the last time you used it, if you did you may have sheared the flywheel key(poor spark on points ignition or good spark but timing out of sync on electronic ignition. hope this helps, regards Tony (England UK)

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