Question about 2011 Honda CRF70F

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Idle screw isnt working it stays at high rev

Just put on brand new carb

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You have an intake leak. too much air is getting past the carb.

Posted on Feb 10, 2014

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Posted on Jan 02, 2017

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SOURCE: Been stood for about 10 years high revs all for

take it to a shop and have the carbs sinked and add a bit of seafoam to gas to clean out everything as this helps alot

Posted on Jul 12, 2011

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SOURCE: 2003 xr80 dirt bike, idle is super high

you should make sure the gas kit is in right and then make sure the idle make sure its right lik not to low but low and den make sure the air is right

Posted on Feb 07, 2013

  • 450 Answers

SOURCE: engine revs

sounds like air getting into carb where it shouldn't, i.e. vacuum pipe from carb to tank or between carb and engine

Posted on Mar 18, 2013

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Just fitted a new carb to my gilera runner 50cc and now it revs really high on idle

I would check a few things. First off make sure the throttle cable is adjusted correctly. Second, try opening the throttle half way and letting go you should hear the inside parts of the carb click as they seat. Third, find the idle adjuster screw turn this anti clockwise and see if the idle speed drops down. Fourth check the choke mechanism is working properly choke/cold start forces a rich mixture to the engine and increases the idle revs.
it is worth checking the pilot air screw is adjusted correctly. Hope this helps.

Mar 04, 2015 | Gilera Motorcycles

1 Answer

Stalls rough idle

You have a vacuum leak that is altering the air /fuel mixture and producing high revs. Make sure that all the vacuum lines are connected including the one to the distributor. Turn the idle mixture screws all the way in then back out 2 1/2 turns . That should get the engine running enough to do a final tune of the carbys.

Oct 12, 2013 | Ford F-100 Cars & Trucks

1 Answer

I have put on new/rebuilt carbs 1100 virago. starts up nicely thenwarms up and idles 2000rpm. everything is new,intake boots etc.please anyone HELP

Check the choke settings . If the choke is set to stay on too long it will have high revs and check the linkage to the throttle to ensure that the adjustment is correct.

Apr 08, 2013 | Motorcycles

1 Answer

Engine revs

sounds like air getting into carb where it shouldn't, i.e. vacuum pipe from carb to tank or between carb and engine

Mar 18, 2013 | 2007 Honda CRF 150 F

1 Answer

My 350 will not stay running. It die when i hit the trigger. I changed all filterss and plugs. If I take off the air filter and use my thumb to open and close the air flow over the carb it will work.

Assuming the carb isn't contaminated with debris I would check / reset the carb settings.
Lightly seat the low and high speed screws and back them out 1 1/4 turns. Try so start saw...if it starts and will idle then let the saw warm up. If it won't start then Back the low speed screw out 1/4 turn...try again. Once the saw is warm then set the idle screw so the chain just stops rotating. Adjust the low speed screw inwards and listen for the rpm to increase as you do...keep going until it starts to drop in rpm....back the screw out until rpms have peaked and back the screw a bit more past that...less than 1/4 turn. Try to work the throttle and tweak the low speed screw until the saw revs crisply...readjust idle speed. Apply full throttle and turn the high speed screw in until you hear the saw "sing" will get very smooth and the rpms will increase. DO NOT leave the screw at this setting as it is running very lean and will burn up in short order. Back the screw out until you hear the saw tone "roughen"...the revs will drop a bit and the smoothness in the exhaust tone will disappear. Back the screw out a bit more past the point where the saw tone start to roughen....this will make sure there is sufficient fuel when the saw starts to actually cut.
If none of this works for your saw I would suspect the carb needs to be cleaned / kitted. Also doublecheck that there are no air leaks between the carb and cylinder. Air leaks could be caused by bad gaskets and or loose mounting fasteners.

Dec 14, 2010 | Husqvarna 350 18 Inch Gas Chainsaw 52CC...

1 Answer

Coleman Powermate 1000 Starts fine then revs up and dies

Hi, I just pulled out my Coleman Generator (1000) and it actually started then died. Has been sitting for about 10 months. I ran it out of fuel before putting away. Anyways, it starts for a minute than dies. If I press fuel primer it keeps running but than it dies. So, I took the cover off, the one towards exhaust side and was able to see carburetor. There are two screws with springs on them. I guess these screws control fuel and air for carburetor(you can clearly see they are on carb). As stated above there are not many adjustments. There is no choke for the model I have; just an on and off switch and fuel prime button. The instructions say fuel it up (with the right oil/petrol mix of coarse), switch it to "on", prime it, pull starter cord and then that's it......"not happening". Okay, so I took my little flat head screwdriver and backed out each screw while counting how many times I turned, until I was able to remove completely(PLEASE remove one at a time and take note which one went where AND how many times you backed out). Take a can of carb cleaner with the straw and shoot through the holes where the screws came out of. I shot carb cleaner a couple pumps in each hole. Examine each of screws removed as these have pointed ends(replace if damaged). Put screws back; again make sure you count how many turns. This worked for me. Idles perfect. Thanks!

May 14, 2010 | Coleman Electrical Supplies

1 Answer

I have a yamaha 50cc dirt bike. When we start it, it will only stay running at max speed of 25 mph, and the engine raves up, will not idol at normal. we cleaned the carborater not sure what else to try

If the bike is a 2 stroke (you didn't say which model) then be sure there is oil in the gas (32 to 1). Get a fresh spark plug, clean the air filter, lube the chain and be sure the gearbox has oil. If more is needed, it means cleaning the carb again. Remove the carb then the float bowl and idle and air screws. Soak the entire carb in denatured alcohol for an hour. Now use carb cleaner in a spray can (with the plastic spray nozzle) and spray into every tiny little hole in the carb. Spray into the throttle and air screw holes very well and also the small drill holes in the throat of the carb. When you put the throttle and air screws back in place, turn them inward until they LIGHTLY seat then back each of them outward one and one half turns. This is the factory setting. If screwed in tight, you will damage the screw adjusters and the jets and the bike will not perform properly.

I am not clear about the high revs, but if you are saying the bike revs up and up to a high speed all by itself then there is an air leak between the carb and the cylinder. Old rubber fittings get dry and hard then get fine cracks in them. The extra air gets into the fuel mix due to the bad rubber seals and can cause the engine to rev upward. If the dealer doesn't have the parts (I don't know what year your bike is), go to Chances are you can get the new parts there. Please rate my solution. thanks.

Dec 22, 2009 | 2000 Yamaha TDR 125

1 Answer

It runs normally at high revs but dies on idle

the units came out with EPA carb's some have idle screw adjustment and preset high jet, or the other way depending on the unit. try and change the fuel, use only high octane fuel for 2 cyc no ethanol with fresh oil mix, run for about 5 to 10 min's. if your carb has adjustment screws set your low side idle screw but still change the fuel.

Sep 03, 2009 | Homelite Mighty Lite Lawn Trimmer

3 Answers


Remove the water trap bowl at the bottom of the petcock, (gas valve). Any water or trash in the bowl? Drain a cup of gas from the tank. 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 two screws on the outside throat of the carb and spray into the screw holes as well.
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. 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. Set the idle speed with the idle screw. This process should get you back on the road.

Since you mentioned uneven idle revs, be sure the carb and manifold are on tight and also tighten the cylinder and head. Air leaks can screw up the idle.

Please rate this solution. Thanks speedfreak41

Apr 04, 2009 | Yamaha SR 125 Motorcycles

1 Answer

I have a keeway 125 bike new idle prob

Pull the carb off the bike and clean it inside and out. Be sure main jet is clear. Remove the two screws on the outside throat of the carb and spray into the screw holes as well. Be sure to put these two screws back in the same hole they came out of. IMPORTANT > > > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward.

Put the rest of the carb back together and install the carb. Turn the gas on to let the float bowl fill then start the engine. Chances are this will fix the problem. I suggest that you install an in-line fuel filter to prevent this happening again.

Last item> You should have just a little bit of slack in the throttle cable where it goes into the top of the carb. Not more than 1/16". Let me know how things turn out.

Please rate this solution as " FixYa " if all goes well. Thanks

Mar 28, 2009 | 2004 Yamaha TT-R 125 L

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