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Lifan 150 cc high output idles ok but runs rough and misses through to full throttle. Already changed plug,new carb and various jets have been tried. New spark module. Valves adjusted. No change in how it runs. Checked timing as well.

Posted by Anonymous on

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6ya6ya
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Posted on Jan 02, 2017

  • 3567 Answers

SOURCE: XR 70. Idles fine. Won't throttle up just dies. Changed Plug, gas, cleaned carb...what am I missing

ALWAYS have a fire extinguisher at hand when working on carburetors.
Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Drain a cup of gas from the tank. Is there any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).

Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the idle screw and the air screw on the outside throat of the
carb and spray into the screw holes as well.
< < READ CLOSELY > >
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward. Before putting the slides back in the throat of the carbs, move the clip on the jet needle one notch lower. Put the rest of the
carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. This process should get you back on the road.

Please rate this solution. Thanks!

Posted on May 08, 2009

  • 7 Answers

SOURCE: 25cc weed eater, will only idle

double check your carb as it should have a screw for the fuel mixture. some carbs have a plastic piece over them that only lets you move the screws so far if you need more extreme adjustment they pull out about a 1/8th of a inch then you can turn in then push it back in, same principals as making a flame on a bic lighter bigger, if you cant find it take some pics of your carb and email them to me @ prerunnerrngr@yahoo.com and i will point them out

Posted on Jul 14, 2009

wolfwizard11
  • 5 Answers

SOURCE: MANTIS WILL NOT IDLE

I had the same problem. I adjusted the throttle stop IN until I got an idle without touching the throttle.

Posted on Aug 04, 2009

  • 311 Answers

SOURCE: ltz 250 wont idle needs full choke to run.cleaned

hi,sounds to me like the air fuel ratio is all up the ***,locate the air/fuel screw on the carb(normally on the side)screw the screw right in untill it stops,then back the screw out 1.5 turns,this should get the bike to run without the choke,once you have the bike running simply turn the screw in or out untill the bike settles into a nice steady idle,should be good to go,hope this helps...cheers

Posted on Mar 27, 2010

  • 1 Answer

SOURCE: 2002 buell blast is running rough - missing - backfiring

Wow, my 2002 blast is doing the same thing, or at least it was untill it blew a hole through the exhaust and quit running all together. Time for a sportster.

Posted on Sep 05, 2010

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Why won't my FeatherLite FL-20C weed eater will not stay running when I put it in full choke. What could be wrong?


It should run ok after warming up. After starting it, let it run for a minute or so and then try gradually opening the choke. You might try increasing the throttle setting at the same time. After the motor is hot, if you have to have the throttle setting increased in order to keep it running it means the idle setting needs to be increased, usually by turning a screw to keep the fuel valve from closing so much, or that there is a problem with the fuel flow......like a clogged jet or fuel passage in the carb.

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I have a small 4wheeler that is hard to start and will not idle it will run at speed but if you stop it doesn't idle it dies


Your pilot jet in the carb is plugged up or to small you will have to pull the carb out and clean it if you have a wire brush you can use 1 of the needles off it that will fit in the tiny hole in the pilot jet push it through and then spay carb cleaner through it and the main jet put back together and it should run fine

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It sounds to me that your carbs might be a little gunked up - you mentioned the gas may have been old, so it's possible that the smaller (idle) jets are slightly plugged up. Fresh fuel might do the trick and/or you could try using a fuel system cleaner and water remover. This problem might 'solve itself' with a little time.

As far as the backfire - this might be either from the carb issue or it could be related to that rattle you mentioned - you could have a loose connection at or near the head - this can **** air and cause a backfire.

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Chain saw will idle, but not run at full throtle


First, check the air filter and clean it well. Then make sure the spark plug is clean and gapped properly.

Then prime, start it up, and allow it to idle, even using the trigger to make it fast idle if you can. Using a small thin screwdiver, turn the high speed idle screw on the carb in small increments to the right, kepping the speed up on the trhrottle.

The idea is to screw it out until it sputters, then screw it a half turn back in. If it doesn't smooth out when turning it to the right, try going to the left.

Afterwards you may find it doesn't run at low throttle well. If not, try the same thing starting to turn left until it smooths out. If it doesn't, screw to the right. Again, the idea is to go until it sounds rough, then back off a half turn.

You should be able to adjust it to the point where you can open the throttle all the way with smooth sure throttle increase.

Nov 05, 2009 | Poulan Wild Thing 2375 18" Gas Chain Saw...

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Need to adjust 3 screws. I already try to adjust them, but it runs too fast or dies. Cannot get it right. I know I have to turn in low and high all the way and then unscrew about 1 1/4 turn back. Where to...


ok here goes. you are write to wind out the screws 1 1/4 turns +/-

you have 2 scews for the carb jets, the other is the idle speed adjuster. it has a conical shaft which simply open the throtle more as you screw it in. wind this in so that it will run a bit fast . if you can, start the saw. Without pulling the throttle, slowly turn the "low" jet in , or out untill the saw runs faster. if it starts running too fast, adjust the idle speed scew down a little. do this untill it is running best. adjust the idle speed down until the cahin just stops moving. the low speed is now set. now pull the trigger and run the saw full throttle. adjust the "high" jet in or out slightly until it is running fastest. Note..if you turn either screw in too far, the engine will stall.

I hope this helps,

Another thing that could cause problems is if there is an air gap between the carb and the cylinder. check that fixing screws are tight. check that the gasket is ok. some saws have a small rubber manifold between the carb and the cylinder. if this manifold is perferated or damaged,it will let air into the engine, and therefore will not run right.
good luck.

Sep 19, 2009 | Garden

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I have a 1999 honda valkyrie interstate. it is idling and throttling rough. with the choke engaged at startup it will only idle at about 1100 rpm. when i throttle up it it just doesnt feel like it should....


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Off idle miss


and I'm out of ideas. I have a RR 125 Motard with about 12000 miles on the clock. It's been trouble free for the years that I've owned it. Recently I noticed a slight miss when running at part throttle. RPM doesn't matter it misses from idle to almost redline but only when the throttle is in the first 5% of it's range. I did the full routine, carb cleaning, valve adjustment (ugh...shims), air/fuel/oil filters. No change. At more than 5% throttle, there's no miss, and it pulls very strong. At full throttle, I don't have the guts to see the end of 4th gear. Tempurature doesn't make a difference, hot or cold, it runs the same, although when the choke is on (cold) there's no miss (but a high idle). Turning on the choke after it's wamed up it will bog and die (like it should). I suppose I could have missed something when cleaning the carbs, but usually, a little bit of choke will fix that. Not in this case. There's no hesitation when opening the throttle, and under high loads, any RPM, any gear, it runs fine. So, I'm at a loss. I'm open to suggestions. ,Check for vacuum leaks first - carb boots, vacuum lines, etc. Also check the CV diaphragms for cracks, splits and pinholes. Then, I think I'd re-check/clean the pilot jets. Then, if that doesn't help, I'd open the idle mixture screws a bit - maybe 1/8 to 1/4 turn to get a little richer mix.,,,

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