Jetting a 2009 carby gt250
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I would 1000% avoid having pods on a hyosung. You will be in a long abyss trying to make it happy afterwards.
Sorry for the sour news , but really i have tried many setups , the carby motors run best with their airboxes on.
Why not just fit K&N 6507 Air Filter. Mind you, the Stock GT250 air filter is the same as the 650, and the carby 250 airbox has more than enough air capacity to run a 650 too.
What’s the restriction in air ? – The silencing cones that’s inside the air filter, that’s why K&N air filter is just an open hole without the noise suppressing one inside.
I don’t know about USA but here in UK, we don’t really like the sigma kits (wishy washy, and sometimes they make you make modifications to carbs we don’t like, like drilling things etc, it’s very silly).
Is there a local Mikuni dealer around you or any bike shop that deals with Mikuni carbs ? – Get 95 Main Jet Front and 97.5 rear = This is the most max setup. Going beyond 97.5 is wasted fuel really, the bike won’t see much dyno gains after that.
Take a look at these carb links for best set up for your bike
[Tutorial] How to adjust Carb Slide Needle (Tuning) – Hyosung GV & GT 125/250
and this one
[Tutorial] How to swap Carb Main Jets – Hyosung GV & GT 125/250
Also, this is hard to ignore ,but “you will notice this” – Get a FULL Size exhaust can (muffler) and make sure it has baffle.
Zero Baffle = Higher top speed (maybe 2-3mph extra) , same with the 125cc here in UK
Baffle included = More low end torqueModify baffle (make the baffle have smaller hole about the dimensions of a 10 Pence british coin) , bike has better acceleration overal.
Baffle = aka. DB Killer.
Why I said to use “Full Size” cans/mufflers, it is because “tiny” ones or “shorty” ones are pointless and extra loud with no real gains. (no backpressure for a heavy twin that needs a little thrust to set off from 0mph)
Full Size Muffler is similar to size of the stock Hyosung GT250 muffler
Hope this info helps, just my 2 cents 😀
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Hey,
Yeah im proably just run a drop in filter if thats the case, its hard to find parts and a lot less aftermarket parts, this shop has 1 of the best selections ive seen, i just wish i could find this in the Usa, id order half the stuff in this shop lol, it would proably cost me double with shipping to get it to me in the US, but do you guys know of a full exhaust system and im looking for a padded front sprocket either a 14 tooth or 13 tooth and maybe just a quality stock rear sprocket, and im looking at lowering links to lower the bike a couple inches “this bike is getting built for my ole lady lol” i have a ton of questions but really cant find any sources for info,
For example I see these roller chain tensioners all over ebay any good? Or crap.
Good sources for the rear sissy bar?
I was looking for the belly fairing any idea where to find 1 thats not half a million dollars
I wanting to keep go fast mods to a minimum and upgrade the stator, swing are shock, ngk plugs and wires ” like the 1s in the shop here”
Or has any 1 priced shipping to the USA and id order from the site and call it a day, lol -
I got you, give me 24hrs i will have info you need to answer your comments , and for sales on this shop, just send an email with any updated requests for parts, i can always use cheaper shipping.
If i know a source in USA, i will also link it too, if you are in a rush!
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