revs die when i pull the throttle back to quick???

[skyjet09]

hi there

i have a skyjet 125gy, and befor you start yes it its a chinees bike and its not well liked so i dont need all this get a jap make lol

the bike runs gr8 its just when i pull the throttle back to quick the revs die and goes to cut out so i have to let go of the throttle, and when im going through the gears it will just loose revs when i try to pull the throttle back to go faster, i have to very gently mm by mm pull back the throttle but even then when i get to a certain point the revs will die and it will slow down and then i have to let go of the throttle and start again. when i have it on the stand and full rev it, it goes all groggy and goes to cut out untill i put the throttle back and its ok. i thought i was getting to much petrol but there is only 1 screw on my carb and when i turn it the revs go up and down.

i have tried it with the revs at different points and it still does the same.

andy help will be more then appreciated.

regards

andrew

[tshort2007]

is the bike stock, or have you modified it (exhaust etc?)

Sounds like a fueling problem

[carlperkins00...]

this may sound abit weird but i have come across some bikes that are designed to do that, i had a kinroad xt50 gy (shite) and it did that too. aparently its to stop wheelies and accidents??? haha

[skyjet09]

[carlperkins00...]

told you it would sound weird haha.

the chinese ones are deffinatley not designed to be thrashed though.
even reving too high can bugger them up. mine was very very delicate and i broke it after 2 weeks (from new) hahaha

but yeah it may be a kinked fuel line or something

[temeluchus]

did it always do this?

Check:

1) There isnt any blockage in the fuel system anywhere-fuel filter, fuel lines, fuel tap, is there any crud in the carb?

2) Any holes or cracks in the intake pipes, airbox and inlet stub

3) Check there arent any leaks in the exhaust

Perhaps it may be jetted a bit lean.
____________________
Some shite cruiser. Now with guns and FREEDOM!

[skyjet09]

[Timmeh]

Before you take the engine to bits you should whip the spark plug out and tell us what colour it is.

My guess is it'll be black and sooty.
____________________
GSXR400 x2 | '94 RVF400 | '93 TZR125 4DL (again)
20:22:30 BLUEX5: i would love to be forced to undergo a**l plugging with different sizes
20:48:18 Temeluchus: comp you hunk of smouldering homos3x you

[skyjet09]

[Noxious89123]

Regardless of the age of the plug, if you've been running the bike the colour of the plug will tells us if it's running rich or lean.
____________________
'06 Honda CBR125RW-6 ~ '00 Honda CBR600F-Y ~ '07 Honda CBR600RR-7 ~ Bikeless
'53 Ford Ka 1.3 ~ '03 Vauxhall Astra SRi 1.8 ~ '52 Vauxhall Astra SRi 2.2 ~ '53 Vauxhall Astra GSi

[tutton]

I say its jetted wrong, sounds just like its running too rich...
____________________
Past: '05 Peugeot XPS '99 Aprillia RS125 '94 FZR600R
Current: '02 ZX636 A1P '51 CCM R30

[steo]

you only have the bike a few months & hardly drove it so it's not your job to look for advice on how to fix it. bring it back to where you bought it from as it should be under warranty & tell them what you've been telling us.

[skyjet09]

hi again

i just checked my spark plug and at the bottom it it very black and sooty, what does that mean???????

[steo]

a black & sooty plug means its running too rich, i wouldn't think it's jetted wrong as it's only a new bike. the choke could be faulty & sticking, is it manual or automatic? you said you could only see one adjustment screw on the carb, the tickover screw? have a look again, there should be an air/mixture screw beside it. it doesn't stick out like the tickover screw & it's probably flush with the carb with a slot in it for a flat blade screwdriver. if your choke is not faulty then adjust the air screw, if you screw it into the carb till you feel it getting tight then unscrew it two turns. you should be pretty close to the right fuel/air mix. clean the sparkplug as it's fouled up & make sure your getting a nice spark. i still think you should bring the bike back to the shop & let them deal with it but i hope this helps.....

[Finglonga]

[Timmeh]

[skyjet09]

[steo]

ahh the plot thickens, seems like an odd way to buy a bike with no sparkplug & not running, especially off fleabay. i suspect the previous owner had the same grief as you & decided to get shut. anyway as you have the carb off, you may as well clean & inspect it. what size is the main jet, it should be written on it, what position is the circlip on the needle which slides down into the carb? that screw underneath the carb is your air screw. turn it all the way in & then unscrew it 2 turns.

[skyjet09]

ALL DONE, IT WAS THE SPARK PLUG GAP BTWEEN THE CENTER ELECTRODE AND THE SIDE ELECTRODE, I HAD TO MAKE THE GAP SMALLER