20 Most Recent Pit Bike 125cc 4 Stroke Dirt Bike Questions & Answers

Check the wiring on the connector plugs make sure all the wires are the same color on both sides, red to red blue to blue and so on. I had the same problem After replacing a stator and just plugging it in,after two weeks a new cdi and coil i noticed there were two wires transposed.

driveshaft or chain

when you put a bike into gear the chain tightens sounds like it is to tight move the back wheel closer to the swing arm about an inch that should do it

hope this helps

John

Limited help here. The best thing is to use Google Translate and email the Chinese maker for Service Manual PDF. https://www.google.com/search?q=124cc+ducar+dirt+bike+wiring+diagram Or contact local distributors https://www.google.com/search?q=124cc+ducar+dirt+bike ..

Use a timing light to get a ball park setting and then your ears will finish the job.

Hi it sounds to me that the teeth on the front chain sprket could be worn so the chain locks,best thing to do is to take the side caseing off and check.(if it needs replaceing its always best to replace the back sproket and chain aswell,wish you all the best.

dirt in carb

1. Wrong coil for service application. 2. Damaged or worn out spark plugs. 3. Spark plug gap too wide. Amazon com Suriora Mouse Pad Comfort Silica Gel Wrist Rest Support Mouse...

Has bike got compreshion

tighten the chain and straighten the back tyre

is the bike a2 stroke or a four stroke? regards Ray.

you will have to check lead to spark plug then lead to coil if your not getting spark at plug it could be a number of things ingintion or just a loose wire best of luck hope you solve it

Rings or oil in the gas.

use a slide hammer with bearing attachment to pull out old bearings and replace with new ones

You can check ur values but some bike do make a we ticking from the values and it will back fire when revved up because of the extra fuel once revved that hasn't brine burn as it revs back down to idle speed.

Clean carb and air mix screw needs set and rev screw

Replace the co

If youre talking about the spring in the carbs. throttle bodythe answer is yes.Inside the main chamber is a cylinder with a long pin ,this pin or needle goes to the main jet which governs the gas flow.if the spring is missing the needle will be in the wrong position .as far as the floats are concerned they teater on a set pin and are designed to float on top of the fuel in the float chamber.make sure they move freely and that there not rubbing on anything or bent.you might want to try some starting fluid to get things started then make your adjustments,after starting aduust the idle screw first.a good formula for idle screw is turn the screw all the way in .Then turn it out 3 and one half turns out,good luck,Gary

Regular unleded