Ok i have a 2008 chineese 150cc scooter with 2300 km on it it has ran fine till just recently like a snap of a finger it dosent run right when you first start it it fires right up and idles just fine when you take off between 0 and 30 mph it acellerates ok not as strong as it used to be then it will get up to speed like it will make it to 50 its just slow getting there and it heaitates it lightly jerks as your getting up to speed and it also lighly jerks when you at speed and when you fully throttle it it hesitates more but if you lay off the throtthle just a little it speeds up a bit better any ideas?
Motorcycles - HM - CRE F500XI - 2008 HM CRE F500XI
Answers & Comments
I assume it is a 4 stroke engine, so this is a probable fault coming due to the carburator.You may need to strip down the carb and give it a good clean.Also make sure there is petrol running smoothly to the carb.It seems a problem with petrol flow or air intake.Both has the same end problems.Now if this is a 2 stroke engine then it may have a problem with the valve, could be the cause of a broken blade.Good luck with it.
It could be according to my experience but dont think that bad about it as this happen in racing engines when we reach over tuning and perfomance.But for a factory designed bike it should be solved with the cleaning the carb.Good luck with it.
I would suggest to clean the carb and test what i have explained so far and this should solve your problem.
This sounds like fuel starvation.
- Use the carb drain screw and check to see if there is water in the float bowl. Drain the carb with the fuel off and leave the drain open momentarily to flush the bottom of the bowl then close the drain screw.
- Also check the position of the fuel selector on the bottom of the gas tank. It may be partially off or in the reserve position.
- There should also be a fuel filter bowl that can have debris in it. If the problem persists your going to have to start looking at the float needle and seat for debris. This will require removal of the float to gain access to the needle and seat. What ever you do DO NOT change the float level unless your sure it needs adjusted up.
- If there is a fuel mainfold on the side of the carb remove the manifold and check the screen inside the manifold for debris.
The symptom you described can also be caused by a leaking intake gasket / (Vacuum leak)
Lastly.. and you best know what your doing...., you may have to remove the fuel air mixture screw on the side of the carb and clean out the passages with carb cleaner.
Thanks for using FixYa,
Kelly
It sounds like it is loading up on fuel. I had a Kymco scooter that did the same thing. I had to adjust the fuel screw on the carb to get it to work right. That screw should be near the fuel inlet line on the carb where the line comes from the fuel tank. Make small adjustments only. You might want to mark the original position with a marker incase the adjustments you make keep the engine from running. Of course, only mess with the carb after checking the fuel filter and the spark plug. A fouled out spark plug can cause issues like this as well.
Spahotel2518,
Sounds like a plugged fuel filter. Also, if this bike has an air filter replace it as well. Make sure the spark plug(s) are in good shape as well as the plug wire(s).
Make sure you're oil is full too, and there are no leaks, as well as making sure (if applicable) that you're fuel mixture is correct.
FYI: Premium fuel tends to eat the fuel lines (filters) and injectors on smaller engines, especially if the engine is not being run on a regular (daily/ever other day) type basis, such as a car is. I learned this from a couple of avid boater that some into my fuel station. One of them had to replace injectors due to the premium fuel. The fuel IS good for the engines, just over time they corrod rubber and soft metal parts. (according the the boat owner)
Please let me know if you need any further assistance with this matter.
Cordially,
carsandcomps,
Guru, Premium Expert @Fixya.com