Top 20 Pit Bike 125cc 4 Stroke Dirt Bike Questions & Answers

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.

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...

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

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

Rings or oil in the gas.

About 80\90 mph

Clean carb and air mix screw needs set and rev screw

Has bike got compreshion

pull cover on magneto and check for loose pickup coil.

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

you need a bit more lead quick get you out of trouble gadget get a lead pencil and go over all the electrical connections including your spark plug then check your cdi, cdi pick up, coil, lead and spark plug the coil lead may need cutting back about 10mm

wow , alot of information here is it in neutral , ,does it have a chain on it and is the motor seized up or even in gear ,are the brakes locked up , could be a number of things , ck those things and get back on here ,these may be dumd answers but I have seen them all

Can't kick start in neutral?

pull out the plug clean it off and while out crank it a few times do not give it any throttle action at all and whey you put it back in ,, in a few min close the choke and hit the throttle 1 time and it should start , start opening choke as it warms up

Replace the co

Make sure oil level and viscosity is proper, clean out the head fins so engine can breath, lose some weight,(your too heavy for the bike), if water cooled? check rad-cooling fluid?

Clutch worn or cable to slack or tight or gear box is smashed

Regular unleded