Idle issue

[Ryan onions]

Hi all bike starts fine runs on choke turn choke off the bike idles but slowly dies have no idea where to start iv changed pkugs fuel filter and air filter oil

Don’t know where to turn to now any advice would be greatly appreciated

Pkus the revs drop down slower than they should

[♠️ MARCEL]

Hey welcome!

Sorry I didn’t reply sooner, I have just read this so , my best replies are already found in these below
(GV125 / GT125 / GT125R = are the same engine anyway)

#1. topic link 1

#2. Topic link 2

#3. topic link 3

If the infomation on the links above did not help, let us know exactly what steps were taken & if the bike made any improvements at all?

I hope this is just a quick fix for you.

// Meditation doesn't mean you have to sit still....

[Ryan onions]

Thanks Marcel I apreciate the advice il try these steps will the upjet to a 90 jet make much difference and to be honest I don’t think the fuel lines have ever been changed upon inspection they look really aged as my gtr is a 09 plate but I plan to try these steps u advised as I herd ur a hyosung guru  but any further tips would be much appreciated

Cheers Marcel all the best

Ryan

[♠️ MARCEL]

* Any * pipe on bike = must be replaced within 2-4yrs max.
Rubber rots inside too. And gums up parts. Stock lines have tiny holes (slower flow)

Braided fuel and air lines last 10 years , and they run colder (meaning heat resistant) so your fuel doesnt turn gassy on a hot day.

Big holes flow more air and fuel.     So your carbs get fuel quicker ,    big  vacuum lines help your pump flow fuel better (it works like a pulse)

So more air in the vacuum system helps.

Giant filters (a good one!) Hold more clean fuel as a mini reserve plus your carb has less dirt going to it.   Cant trust every Petrol station out there.

So  yes air and fuel lines help.   Any extra info is at /shop/ page  or    search  *fuel* in the search bar ^ for a diagram .  Pictures will reveal the differences.

Next up.  Stock jets are crap. I’ll leave it at that lol.
Bigger jets = slight torque boost, rear engine is COLDER since petrolium has cooling effect.

To understand or how to swap carb jetting  Search *Carb* ^

There is a lot that can be done on these machines,  but one warning.  They hate *china* copy parts!  Eg. Cheap £1 lines. 😉

For anything else (tune wise), copy this link  or tap below
https://m.facebook.com/groups/345623961212?view=permalink&id=10154079865506213

It saves me rewritting as i get asked often but  i am amending the list above as i have done a lot more since then.

Will be finding time to make a proper  101 Book for all things  GT125R  tuning  with probably 3 pages but should be enough to allow people to do things without paying mechanics robbery prices.

Also i have uploaded as many service manuals in forum as (125/250 = same frame)  so books also contain a lot of maintenance info etc…

Ofcourse,   if  try everything I said in the previous replies , your bike WILL run better!

// Meditation doesn't mean you have to sit still....

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