Exhaust spitting out fuel in large amounts when starting hyosung gt 650cc

Question edited for clarity.
Question moved from MISC to correct category.

It is cheap Chinese junk with no support. Try cleaning the Throttle Body and if it has a Mas Air Flow sensor, that as well. If the bike shop is stumped, you need to find a new bike shop :>) All this stuff is electronic and is diagnosed by a scan tool computer.

Don't waste your money on fuel additives, they will not fix your problem. You need to remove the carb, then remove the float bowl. Then remove the pilot jet and ream it with compressed air or a small piece of wire ( a bristle from a wire brush should work) Hold the jet up to the light and make sure you can see day-light through it. Do the same to the main jet. Most likely it will be the pilot jet that is clogged.

I have a 2014 gv650 pro that will not idle, it starts and runs with throttle but stalls as soon as revs drop. I've tried to get F1 code to come up but it doesn't just keeps flashing F1. I've replaced spark plugs and caps but F1 is on before you even start the bike and stays on

you have a fuel leak... doh

the fuel petcock diaphram might need to be repaled. or gasket that is from gas tank to fuel shutoff valve could be bad.

Hi I have a 2011 EFI Hyosung gt650. I have just removed fuel tank to replace rear shock. All parts refitted. And now I can't start bike. I have the bike turning over but no brrrrm. Have rechecked the fuel lines are fitted correctly. But still no go. Any ideas please.
Thanks.

does it crank over?....if so check spark...fuel...etc...try to narrow it down to a actual problem such as carbs clogged, or injector not working, other than wont start, not able to tell much from that.

Back firing, or after firing is usaully caused by an exhaust leak. Check around your header flanges for leaking.

A large 17 liter fuel tank ensures long touring range.