Starting and running problems- cheapy Chinese bike.

[tj2]

what motor is it? 50 125 200? what is the engine number including the letters? eg 6fma**** might be able to give better advice
Terry

Hi Terry sorry havn't been online past few days. I managed to sort out all electrical faults atm, still got to reconnect the switches for the lights and the indicaters etc and check that the relay works. For some reason someone cut the ignition wire at the front of the bike and re routed it but didn't re connect :/ ah God knows that's sorted now.

Next problem is the carb. Still having issues cant see any air leaks and present. although the air box has a slight split from the inlet side however i don't think that this is the cause as the bike is running what looks like an after-market cone air filter I can just about get it too idle with choke on now. I have added an exhaust from a pit bike which will hopefully get welded tomorrow if a friend can help. Put a new plug in after letting it idle check the plug black and carbon build up? defo looks like an air leak checked over carb etc cleaned 3 times now.

The engine number I believe is 156FMI-2 *71563399*

And it's a 125

[tj2]

Plug black. Is it wet? if so = too much fuel.
From engine number you posted, looks like overhead valve engine, 2 bolts on cover and valves exposed easy to check that you have a gap. at this stage, just making sure that there is a gap is enough.(to big is better than none) You say bike will idle with choke, fast idle or slow? and for how long? Sorry to bang on but I believe you have a compression problem caused by valve recession

The plug will black up in no time if you're running it on choke for a long time, it's not getting chance to burn off.

Try increasing revs on carb but without choke on, fast idle it.

If this works then slowly decrease revs until it's about to die, then cover the air leak up with some tape or something and if the idle improves then you know it's related to that.

Unless it's set up properly with no air leaks, clean filter etc then it's got no chance of running smooth.

Have you tried without air filter in?

hello again stripped carb again cleaned out completely using ultra sonic machine I think its called put back together ran slightly better. Adjusted the fuel air screw, and the needle height. Bike now will run on tick over with no choke however Smokes quite a bit, and sounds bit boggy when rev'd. The needle is adjusted to the leanest setting, however bike is running very very rich :/.

Also which I couldn't believe lol Upon revving bike trying to set idle etc.. The battery literately decided to catch fire thinking Rectifier or CDI unit? Man is getting a pain also don't know valve clearance as cant download a manual anywhere for it will have to buy off ebay. Ran without filter. Runs worse

[tj2]

Originally Posted by forky

Upon revving bike trying to set idle etc.. The battery literately decided to catch fire thinking Rectifier or CDI unit? Man is getting a pain also don't know valve clearance as cant download a manual anywhere for it will have to buy off ebay. Ran without filter. Runs worse

like I said welcome to the world of chinese motorcycles

tappets....... basically make sure there is a gap dont know this newfangled metric settings but 6 thou inlet and 8 thou exhaust will make sure they close properly without rattling too much.
Possibly had the jets replace by previous owner trying to get more (hahahahaha) power will try and find proper sizes for you.
If you search google with the prefix of the engine number you may find the info you require.......



Dig deep google is your Friend (sometimes ...... if you speak chinese..)

ahahha yeah yeah I know it was going to be a pain but hey they make lovely food gotta give them some credit :P going to pop into bike shop tomorrow hopefully find me a range of jets if there not mega expensive :P

Just a quick update so that you guys know. It was deffo a carb issue, cleaned till Jesus came home but didn't make any use. Bought a new jap carb off ebay fired up first time. To buy a few bulbs 2 mow and set of pads then MOT time. Appreciate all the help guys