Mods thread: Hyosung GT250R

[bloccrule]

Generally I agree with all the advice.
The jet kit I purchased includes the air filter and instructions for the air box modification. It also includes various tools and instructions to de-baffle the stock exhaust. The seller says it took ages to perfect the combination and will not tell anyone what jets etc he's gone with. I checked with other customers who can't rave enough... so fingers crossed. I'm pretty savvy with working on car engines and have most of the tools so shouldn't be a prob.
I'll photo document the kit and the install for anyone interested..... unless it blows my bike up and totally running like rubbish, in which case I will lie to you all and say how awesome it to avoid the "I told you so's"

seems u bought the same kit i did off ebay. i have done every thing but the part where it say u have to the air/fuel screw may be covered by a brass plug due to EPA regulations. drill that out if needed but be careful. start with 2 turns and increasing by 1/2 turn. what in the world does this mean. where is this brass plug at on the carbs. the pictures he sent with my kit does not show u where this plug is at. can u help me

[CookMySock]

Just put a noisy zorst on one of the GT250Rs. Now to get it's mixture checked. I might take both of them in there and get them to A-B them and see if they are different.


Steve

[chaos rider]

Hey, has anyone seen a good rear hugger for a Hyo? I'm looking for a carbon fibre one... Are there any that are available locally? Cheers DJ

um the one i have is awsome but its a one off custom a mate got made for his hyo. and sold it to me when he got sick of crashing

[Hiflyer]

far out man no one on youtube revs their bike high when showing off their exhaust haha

[CookMySock]

far out man no one on youtube revs their bike high when showing off their exhaust haha

Thats coz it sounds ghey.

Steve

[Hiflyer]

uuummm ok? haha whats ghey about hearing a vtwin or nice exhaust at full song?

[CookMySock]

coz its posing.

Steve

[gatch]

Go on DB

Get a perrm

[streethot]

Hi there.....I am from brazil and there are a good qtd of gtr250 over here.....

i am looking foward to improve performance......i know its easy to buy a new bike.......but I likey to put my hands on the work.....all my cars have mods....

i have done so far:
1)carbon exhaust
2)cut wire on the cdi

what i am developing
1)new air filter
2)jetting

we dont have jet kits like that on ebay......but we figure it out with parts from other carbs......

someone have done some head porting on these motors?

[streethot]

and.....

the vaccum that pull fuel pump came from one intake (rear intake), i wonder if i put a " T" conection to pull from both intakes would be better for fuel balance......or it could do any good at all?

[CookMySock]

and.....

the vaccum that pull fuel pump came from one intake (rear intake), i wonder if i put a " T" conection to pull from both intakes would be better for fuel balance......or it could do any good at all?

No, that hose only opens the fuel valve on the tank.

If you want to go faster, the best mods to do on the GT250R is front and rear suspension. Most of the problems with the GT250R are because of its bumpy ride in corners. Change the rear shock and fit cartridge emulators to the forks.

Steve

[streethot]

Can anyone tell what jetting and carb settings are you using with mods like muflers and new air filter.....?

[CookMySock]

Can anyone tell what jetting and carb settings are you using with mods like muflers and new air filter.....?

I just put a two inch straight-through muffler on, and with the jetting standard it's slightly harder to start cold or hot (needs a blip of throttle.) Also the tailpipe is running VERY clean. I think it's a tad lean, so I'm going to get it checked on the exhaust gas analyser and maybe raise the needles with the clip or a shim. I'm not trying for more horsepower - just trying to make sure that the engine is not harmed.

Will report back.

Steve

[streethot]

just tested on street.....

new jets
hi flow air filter
carbon exhaust
wire mod

nice ride......12k rpm easy......could use more advance or something......

on downtown streets only went to 3rd gear at full throttle.....

i am one more very happy GTR250 owner!!!!!!!!!

[woodhillkamikaze]

I had my blue green wire pulled out and then realised that the bike performed better with it in. Talk to the guys at Mt Eden Motorcycles (they are Hyosung Dealers) they'll confirm that pulling the wire out is BS. It goes better the way they built it!