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New Biker - Comet Hyosung Gt125

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CometGeezer
Borekit Bruiser



Joined: 26 Dec 2004
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PostPosted: 21:08 - 26 Dec 2004    Post subject: New Biker - Comet Hyosung Gt125 Reply with quote

Hi there

I;m a new owner of a Comet Hyosung GT125.. i'm told it looks like a hornet or something! (Photo attached)

Lovely big bike doesn't look like a 125 to me (not that I've had that much experience, lol)

Just wondering if anyone can give me any tips on de-restricting it?

So far a mate told me that changing the exhaust system will improve sound, speed and performance.

Cheers,

Matthew.
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Ste
Not Work Safe



Joined: 01 Sep 2002
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PostPosted: 21:15 - 26 Dec 2004    Post subject: Reply with quote

It is a four stroke so there aren't any restrictions you can remove. 14.8bhp is all you're getting from it I'm afraid.

Changing the exhaust will make a very small improvement to the performance of the bike and (IMO) isn't worth doing as it will make no real difference to anything.
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CometGeezer
Borekit Bruiser



Joined: 26 Dec 2004
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PostPosted: 21:28 - 26 Dec 2004    Post subject: Reply with quote

ah well thought i'd ask anyway. Smile
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dodsi
Dirty Carny



Joined: 06 Aug 2004
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PostPosted: 22:40 - 26 Dec 2004    Post subject: Reply with quote

Just take condolance in the fact you have THE BEST LOOKING 125 AVAILABLE
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Keith
World Chat Champion



Joined: 24 Mar 2004
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PostPosted: 00:41 - 27 Dec 2004    Post subject: Reply with quote

Lovely machine you've got there. They really do look great and even bigger than a 125.

One was parked up by my RS outside of college the other week and I couldnt tell whether it was the 125 or 250 as I believe they look the same. Still, couldnt help but admire it for a good few minutes as I let mine warm up.

Either way, lovely machine, so treat her well and make sure she's locked up. Thumbs Up
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Aprilia RSV Mille R Edwards Replica - Aprilia RS250 - Suzuki GSXR600 Supersport Race Bike
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bikedudextrm
Traffic Copper



Joined: 16 Oct 2003
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PostPosted: 01:01 - 27 Dec 2004    Post subject: Reply with quote

As said there isn't much you can do to greatly improve performance but a race can, air filter and altering the jetting should give a little more power.

I know some one who has one and he modded a race can to fit, the standard can has a large baffle in at the end which makes the exit hole small and restrictive, he said the can made quite a bit of difference at top end power. Also he made the inlet on the air filter bigger and up jetted the carb. This made it sound better and again gave it a little more power.

They are very sweet looking bikes and i'm beginning to see quite a few about now. The difference between the 125 and 250 is that the 250 model has gold front up-side-down forks.
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CometGeezer
Borekit Bruiser



Joined: 26 Dec 2004
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PostPosted: 13:48 - 27 Dec 2004    Post subject: Reply with quote

Wow thanks for that. I'll visit my local motorbike dealer to see if they can do the following:
Quote:
a race can, air filter and altering the jetting


I've also done a little digging around the net and an enthusiast recommends the following:

Apparently:

[/quote] A pair of Suzuki GSX 250E Oversize pistons (4 cylinder) might work (I don;t know if he meant re-boring the cylinders out?? as the actual engine is the same as the 250cc but with only 125cc bored out!! A lot of metal to warm up on those winter mornings!!)

Lower profile rear tyre (160/60)

48t or 50t Rear sprocket. [/quote]

and also the same as above quoted will improve sound performance etc.

How much do you think that would set me back for doing the above (with and without the re-boring)

Cheers,

Matt
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rizo-sri200
Trackday Trickster



Joined: 29 Apr 2004
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PostPosted: 14:15 - 27 Dec 2004    Post subject: Reply with quote

Nice looking bikes those are, Look after it. Thumbs Up
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98' Bandit 600 with Slip on
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Claud 14.7 to 1
World Chat Champion



Joined: 06 May 2004
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PostPosted: 18:29 - 27 Dec 2004    Post subject: Reply with quote

CometGeezer wrote:

How much do you think that would set me back for doing the above (with and without the re-boring)



Laughing . Too much. Don't bother.
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CometGeezer
Borekit Bruiser



Joined: 26 Dec 2004
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PostPosted: 09:07 - 28 Dec 2004    Post subject: Reply with quote

Quote:
Laughing . Too much. Don't bother.


LOL, ok!

How much for doing each modification?

Cheers

Matt
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dodsi
Dirty Carny



Joined: 06 Aug 2004
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PostPosted: 20:57 - 28 Dec 2004    Post subject: Reply with quote

Dont mod your comet there really is no point, if its slow do your test and get a bigger bike.

I was sick of 125's slowness...got my licence and am not sick of my 500's slowness
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CometGeezer
Borekit Bruiser



Joined: 26 Dec 2004
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PostPosted: 14:28 - 29 Dec 2004    Post subject: Reply with quote

yeah good point dodsi! Probably costs less to boot! Smile
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b0ss
Nitrous Nuisance



Joined: 22 Sep 2004
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PostPosted: 14:32 - 29 Dec 2004    Post subject: Reply with quote

Hi Mate

Nice bike. Smile I found this in another thread:-

How to remove the restriction:-

Quote:

look at the end of the rear can you will see 3 small welds grind these out with a dremel or small grinding stone pull the tube out and hey presto an engine that breathes a lot better and sounds the business.


https://www.bikechatforums.com/viewtopic.php?t=34828&postdays=0&postorder=asc&start=0
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CometGeezer
Borekit Bruiser



Joined: 26 Dec 2004
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PostPosted: 14:55 - 29 Dec 2004    Post subject: Reply with quote

Nice one b0ss!

Cheers

Matt
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