Modification to Hyosung GT250R muffler

**GT250R** · 18th May 2006, 23:06

recieved a new Muffler today from Mt eden Motorcycles for my GT250R sounds great maybe a touch loud to strart off with but once I got used to it I really do like it they do an exchange deal you gove them your standard muffler and they give you back a standard muffler modified internally so it bolts straight on !
All in all I;m happy with the result noise wise can't coment on performance yet only rode around town but will let you know tomorrow
Good price too $250

Thanks MT Eden Motorcycles!!!!!!!!

**SwanTiger** · 18th May 2006, 23:15

Shit that is a good price.

Haha, I just responded to your other thread from a while ago too. Have you modified the jets or any shit like that yet?

**GT250R** · 19th May 2006, 19:48

Nah not yet but now I have done the mufflerseriously considering the jets aye.
will have to give the boys a call and get prices

**Karma** · 19th May 2006, 19:53

So they take your standard one?

What happens when you fail the WOF because the zorst is too loud?

**GT250R** · 19th May 2006, 19:54

took it for a little blat tonight and can say that there is definately an increase in power top end down low isn't an better but can't say that it has gotten worse either alot of poping off the gass but nothing huge sounds kinda cool I have to admit.
only downside is that around town I thinj abit too loud but a silencer will sort that out I'm making one tomorrow.....

**GT250R** · 19th May 2006, 20:06

yea not much you can do about that...
I'm going to make a silencer for it which will look standard they shouldn't notice with it being the standard hyosung muffler outside Hopefully!!!!

**limbimtimwim** · 19th May 2006, 20:34

You can probably just richen the mixture by twiddling screws to reduce the popping.

**Eurodave** · 19th May 2006, 21:00

Originally Posted by limbimtimwim

You can probably just richen the mixture by twiddling screws to reduce the popping.

I have found that on my bikes ,the popping noise when throttling off, is more likely to be caused by small air leaks at any exhaust pipe & muffler joints
I just take them off , fit a new exhaust gasket & poo up the joints with a little muffler putty, fixes the popping/banging noise every time

**GT250R** · 19th May 2006, 21:08

the gasket is definately not leaking made sure I checked that the popping when throttleing off is definately due to the straight through style of the muffler it has too much flow for down low2" - 2 1/4" straight perf with packing was thinking getting the jet kit done may resolve once tweaked properly

**IronicCapers** · 19th May 2006, 21:33

Spectrum Motorcycles were telling me they put a muffler on a GTR said there were performance gains and it sounded like a Ducati(not sure wich 1 lol) but cant remember wat was said.

Any weaknesses i should be aware of should buy 1. Other than digital speedo that i will change straight away

**mynameis** · 22nd May 2006, 16:10

Originally Posted by GT250R

took it for a little blat tonight and can say that there is definately an increase in power top end down low isn't an better but can't say that it has gotten worse either alot of poping off the gass but nothing huge sounds kinda cool I have to admit.
only downside is that around town I thinj abit too loud but a silencer will sort that out I'm making one tomorrow.....

Alright very interesting to see there is an actual increase in power by just changing the exhaust 1/4 inch aye?

Isnt the bike like 21 kilowatts and top end speed is 140 km/ph? So what kinda top end speed did you notice mate ?

**GT250R** · 22nd May 2006, 23:07

well I can say that before I had the muffler fitted I have had the bike up to 152Kph and then the night I fitted it did a run not to full red line which I reached 169Kph can't confirm what Rpm I was at as traffic was nearing and I buttoned off,
As for the 1/4 of and Inch increase you have to also allow for the fact it is now free flow and no longer restricted by the internal chamber which on sight was tiny!!! Like get my finger stuck small

**BarBender** · 23rd May 2006, 07:49

Originally Posted by GT250R

152Kph and then the night I fitted it did a run not to full red line which I reached 169Kph can't confirm what Rpm I was at as traffic was nearing and I buttoned off

Thats quite an increase. Any change in acceleration?