Spark and fuel no start 125cc help please

[Range]

Hello people I am a new rider and having problems with my bike it's a 125cc. I can't get it to start, it's got new Cdi unit, coil and battery. I have cleaned the carb out. I am getting spark and fuel. When I start the bike electronically it will just crank but not fire. If I bump start it engine will run but not Rev, but when I put the clutch back in it dies. Any suggestions will be appreciated

Regards

Sam
____________________
Awsss😀

[mudcow007]

Are you sure you have rebuilt the carb correctly?

mixture screw setting?

airfilter connected etc?

what condition is the plug in an have you changed it?

Did you buy the bike broken, or has this just happened?

[Nobby the Bastard]

Have you done a plug chop?
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

[Rogerborg]

What bike?

[Nobby the Bastard]

[Range]

yh the carb is set properly. A new spark plug has been put in. The air filter is quite dirty and maybe that might need to be changed. I haven't done a plug chop on it because don't you have to have it starting to do it?
____________________
Awsss😀

[Nobby the Bastard]

<Borgmode-on>

WHAT DID YOU CHANGE BEFORE IT STOPPED WORKING

<Borgmode-off>
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

[Range]

The battery was not good on it so I changed the battery.
____________________
Awsss😀

[Nobby the Bastard]

So you bought a bike that didn't work?
____________________
trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

[Range]

No no it was working and I was riding it for a few days after I bought it. Does anyone know what to try then?
____________________
Awsss😀

[Teflon-Mike]

[mudcow007]

What bike is it?

Reset the carb to factory settings - mixture etc...

How dirty is the air filter - like black as a witches hat or just a bit dusty?

New battery or just charged the old one?

Is this a ped that someone has bodged to make it have 1000bhp?

[Range]

It's a white knuckle 125cc sport.

When I purchased the bike it would start with choke. After a 5-10 minute journey if turned off it would not start, after around 30 minutes it would fire again but sometimes I thought it was just luck.

So changed the battery as old one was tired. Same problem still. So next took the carb out, jetted it with carb cleaner making sure all passageways were clean. Replaced now it won't start at all.

Took spark plug out, it's got spark check against the block. From all the cranking I thought it might be flooded so throttle wide open and cranked it. A spray of petrol spurted out the spark plug hole saw thought to myself it must be getting fuel.

Checked compression by finger test. It blew my finger and sucked it in so thought that must be fine.

Next thought il bump start it. Put it in second went down a hill, pop the clutch the engine started, gave it some throttle with no response just a low thumping sound coming from the exhaust. Put the clutch back in the engine dies.

When started it would ride well bar the lumpy idle that sometimes used to occur.
____________________
Awsss😀

[Ariel Badger]

Sounds like the initial problem could have been a blocked vent to the tank causing fuel starvation. Your carb rebuild has made it worse, un-rebuild it.
____________________
Bikers make great organ donors, get 115 on your licence today.

[Sdrobo]

Start by elimination smallest least expensive so on

Check all grounding points . I.e. kill switch , one on handlebar , stand

Check your float level as it sounds as tho you've fucked it up. If you've took plug out and it's spitting fuel out on a 125 its too much

Adjust float

But like the guys said your not helping yourself by describing your bike / problem

4 things spark fuel air compression . But you could say 5 as in being a you.

And just because you can see a spark is just not enough.

What color is it cos if it's weak it won't spark under compression

Anyway I have my own bike to sort but with yours could even be the coil.

One last thing a good way to start would have been to introduce yourself and start from the beginning sounds to me like there are too many little problems with the bike that have either been boged or just built up .

And you've jumped too quickly from one thing to the next . Like pull plug see spark so can't be that then dismiss it far too quick probably causing more issues as you do .start again take your time then come back

[Teflon-Mike]

[Range]

your a sarcastic little fucker arnt you. you seem knowledgable but also seem like a fuckin robot. next time your at the stores remember to buy some imagination.

i have never fucked with anything that did not need to be looked at, when i used to have it started i saw a leak coming from the carb hence the reason i took the carb OUT and reset the float height. float mechanism looked good and the needle seated fine. the carb was put back together fine, i have had it out again after to recheck it and all seems ok.

i have a new spark plug. last spark plug was tan coloured no sooty deposits.

i bumped it because it would not start on the button. when i popped the clutch the engine fired, but i could not accelerate, as it lost speed the engine seemed like it was dieing, putting the clutch back in to put into neutral killed the engine even if im rolling at speed.

As i said before it was a hard start when i got it but when it started it ran ok. now it just does not want to fire up but just crank.

why would i leave the choke on for a 10-14 minute while i am riding. or are you the only one who knows not to do this. only use choke when its cold.

when i say sprayed thats exacly what i mean, other wise i would use a different word.
____________________
Awsss😀

[temeluchus]

https://img.michaeljacksonspictures.com/wp-content/uploads/2014/08/popcorn-blank.gif
____________________
Some shite cruiser. Now with guns and FREEDOM!

[Marmalade]

Seriously, I can't believe he is really as ignorant or stupid to keep posting a bible worth of text every time someone asks a 125cc question.
He's got to be trolling.
____________________
Nobby the Bastard: How yo tell the difference between the actual japanese and her just screaming because she's had live fish stuck up her arse? [url=https://www.nicks-shop.co.uk/bcf-goodies-15-c.aspGet BCF stickers and things here[/url] Reflective helmet stickers - Legal requirement in france - Clicky

[CaNsA]

[FretGrinder]

https://media.giphy.com/media/xTk9ZvM0T4qqoFbzIk/giphy.gif

https://s2.quickmeme.com/img/8d/8d71ad0b7cb19fc5a505568a2e94c16bbc357f89a20e07803b40b00b3af48ea2.jpg

https://s28.postimg.org/aren7oxfh/seriously_your_post_might_be_a_little_too_long_o.jpg
____________________
Yamaha MT-09

ಠ_ಠ

[bubzy1000]

I had a similar problem with my tzr125 (although it is a 2 stroke) the main jet into the carb was blocked. This meant it would kinda run, but only with the choke out, and wouldn't idle at all, really boggy throttle response, just generally quite depressing.

Im definitely no expert, just my "2 cents" but i would check the carb again, take it apart, take the jets out and make sure they are clear, i had to use a very fine piece of steel wire to clear mine as the bike had been sitting for 9 years and the junk in there was solid. so a spray with a cleaner might not be enough.

good luck!

[Rogerborg]

Don't mind Tef, he's got into the cooking sherry again.

I'd wonder why the battery was "tired". Was it not charging? Over-charging? Any dry cells, bulges, leaks?

That said, I would lean towards fuel. Are you sure the float isn't sticking in situ? Popped the float bowl off, checked it can be wiggled? Jets, definitely inspect for blockages, run a strand of thin copper wire from an electrical cable through if you're not completely sure.

If it's a slide carb, ensure that you've put the slide back in oriented correctly so that it can drop all the way down.

Did you do anything with the idle mixture screw? If so, how did you reset it? What brand is the carb?
____________________
Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[Teflon-Mike]

[CaNsA]