Question about 2003 ATK 125 4-stroke

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To long to warm up

I have a 125 4-stroke it seems to take to long to warm up and as it warms up and even when it gets to operating temp.

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It will pop on accelerating like a misfire only when i give it the gas faster than normal. It will happen also when i am riding and also with a slight hesitation. If anyone has any suggestions it would be great.....thanksThe first thing I'd try is some Seafoam in the gas.,,

Posted on Nov 10, 2008

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1 Answer

My gilera runner 125 4 stroke trouble starting when started runs a few seconds then cuts out

That could be one of many things, could be a tight valve clearance,fuelling problem ,ignition failure.all of these can fail when the bike has just run for a bit,the primary ignition and secondary ignition coil can fail from the heat it generates and the valves tighten as they warm.up through thermal growth.and the fuel goes down sometimes faster than it can 've delivered.these hikes have a pneumatic fuel pump and the vacuum pipe that operates it falls off the inlet manifold which stops it pumping.

Mar 08, 2015 | Gilera Motorcycles

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Rebuilt and still smoking

how much smoke because 2 stroke engines do blow quite a lot of smoke it is normal as you mix oil with fuel to lube the cylinder walls and the piston

Jan 24, 2014 | 2008 Husqvarna CR 125

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Hi, I bought a brand new Keeway Outlook 125 jusy 5 weeks ago. Since I bought i had problems when starting it so they put in a new carburator that had a new automatic choke on it. I still have problems...

Is it normal that a new bike dies on you as you drive it? No way my friend. The carburetor should have a thermal-choke and it probably needs some adjustment.

Sep 08, 2011 | 2010 Keeway Outlook 125

1 Answer

Smoke coming from exhaust

this is normal for the bike to smoke.
dose it do it when you first start
with it being a 2 stroke smoking is good as long as its not doing it after you have warmed the bike up
if it is check that the choke is not sticking

Apr 19, 2010 | 2000 Honda NSR 125

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New piston break-in procedures for a yz 125 2 stroke

let the bike idle for the first min or so then give it a few quick burps on the throttle let it warm right up to operating temp then drive it go through the gears nice and easy first couple times after that you should be able to start opening it up and riding it like you normally would.

Sep 20, 2009 | Yamaha YZ 125 Motorcycles

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My 2000 suzuki katana has a high idle when its hot

This is a fairly common problem with performance bikes. The problem comes from your thermostat. The thermostat is designed to open and close at a certain temp. What I suspect is happening is that your thermostat is opening too early for the bike to get to operating temp, hence the long time to warm up. Once you open up the bike warms up and the oil viscosity thins to operating temp and the engine revs more freely. Now your idle screws are set for a "cold" bike and revs high.

The other side is that the oil you are using may not be designed for your bike. Often people put performance synthetic oils in their bikes to perform better, but the production bikes are designed for thicker oils. Oils like 5w40 will be very thin allowing your bike to rev faster due to thinner oil, but you are causing extra wear on the parts due to less oil barrier.

First I suggest make sure you have the correct spec oil for you bike, then check that you have the correct thermostat in your cooling system. A performance bikes usual operating temp is between 95-105 deg C. This means your thermostat should only open at about 88deg C to start the regulation process.

Sep 17, 2009 | 1993 Suzuki GSX 600 F (Katana)

1 Answer

!991 FZR 1000 Idle normal when cool, High when hot(2-3,000)

Sounds like you need the carbs cleaned and synchronized, then the idle set once the bike warms up. May also have a cracked intake boot, or a vacuum line off.

Jun 09, 2009 | 1991 Yamaha FZR 1000

1 Answer

Not warming up or keeping tickover keeps cutting out althoughnot

carb needs a clean , try fireing a bit of injector cleaner into the carb (remove airfilter and spray a little bit at a time !! then try again , if still no good the carb will need to come off and be cleaned ,
hope this helps
kind regards

Mar 18, 2009 | 1990 Aprilia AF1 125 Futura

1 Answer

Started and then died

the engine quit and the bike will not restart. No lights come on either. I believe I smelled a little burn odor just before the bike died. It was washed and dried yesterday but not started until this morning. Any ideas on what it might be?Sounds like some electrical troubleshooting is in order. Check all the fuses and connections for signs of frying if you smelled burning electrical components. Check your battery voltage and connections. and anything else you can see while poking around. This may involve touching parts of the bike that are not on the handlebars,

Nov 10, 2008 | 2003 ATK 125 4-stroke

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