New Bike Issues - GV125 Hyosung

[captainmoore]

Hi all, I recently purchased a Hyosung GV125 (very happy with my early midlife crisis purchase). However it has started to worry me. Firstly when in 6th gear it sometimes coughs and I loose power but the revs go up. Lurching forward in a very uncool manner.
Secondly, and this is more recently, it has started errm sneezing I guess. whenever I drop down a gear slightly too soon it sounds like it sneezes. I can't tell where the noise is coming from either.
The fact that this bike has had a service in the last 2000 kilometers and has only 4500 kilometers on the clock, makes me feel I've forgotten how to ride carefully. Any thoughts would be welcome.
Cheers!

Oh yes and I nod to everyone, even scooters with L plates! Ok not everyone.

[N cee thirty]

by sneezing do you mean popping ?

the air this time of year makes it do it
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'00 Aprilia RS50 > '92 Honda CG > '99 Yamaha Fazer > '91 Yamaha RXS > '79 Suzuki X5 > 01' Honda Cg > 07' Honda Cg > 82' Kawasaki Z200 > suzuki gsxr 400 gk73a > honda vfr 400 NC30 Mod 2 Passed 09/06/2011

Jewlio Iglesias wrote: I actually did vote BNP once

[Gazz]

[Gazz]

Are your revs high enough for the gear you are in ?

What speed are you doing when you are in your top gear (5th or 6th) ?

[captainmoore]

[The Shaggy D.A.]

Lose power but your revs go up? Your clutch is slipping.
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Chances are quite high you are not in my Monkeysphere, and I don't care about you. Don't take it personally.
Currently : Royal Enfield 350 Meteor
Previously : CB100N > CB250RS > XJ900F > GT550 > GPZ750R/1000RX > AJS M16 > R100RT > Bullet 500 > CB500 > LS650P > Bullet Electra X & YBR125 > Bullet 350 "Superstar" & YBR125 Custom > Royal Enfield Classic 500 Despatch Limited Edition (28 of 200) & CB Two-Fifty Nighthawk > ER5

[captainmoore]

[captainmoore]

[The Shaggy D.A.]

If you just tighten the cable, it'll slip more

Slacken it off, then adjust it so you have a couple of mm travel before the clutch starts to lift. There's probably another adjuster at the other end of the cable too.
____________________
Chances are quite high you are not in my Monkeysphere, and I don't care about you. Don't take it personally.
Currently : Royal Enfield 350 Meteor
Previously : CB100N > CB250RS > XJ900F > GT550 > GPZ750R/1000RX > AJS M16 > R100RT > Bullet 500 > CB500 > LS650P > Bullet Electra X & YBR125 > Bullet 350 "Superstar" & YBR125 Custom > Royal Enfield Classic 500 Despatch Limited Edition (28 of 200) & CB Two-Fifty Nighthawk > ER5

[captainmoore]

[The Shaggy D.A.]

It's more of a trial and error thing, too slack and you'll find gear changing become awkward (or impossible) and the bike will creep forward when in gear with the clutch in. Best to take it for a run with the spanners in your pocket, so you can fine tune it.
____________________
Chances are quite high you are not in my Monkeysphere, and I don't care about you. Don't take it personally.
Currently : Royal Enfield 350 Meteor
Previously : CB100N > CB250RS > XJ900F > GT550 > GPZ750R/1000RX > AJS M16 > R100RT > Bullet 500 > CB500 > LS650P > Bullet Electra X & YBR125 > Bullet 350 "Superstar" & YBR125 Custom > Royal Enfield Classic 500 Despatch Limited Edition (28 of 200) & CB Two-Fifty Nighthawk > ER5

[ORourke]

When it looses power in 6th, it lurches and revs, and then what happens? Do you have to change to 5th, or does it fix itself?

[captainmoore]

[warped one]

On my GT650r it has a adjuster on clutch basket itself, which needs adjusting every now and then.

The sneezing could be the AIS kicking in which is meant to clean up the emission's.

On my Gt it back fires like mad on the run down, but is all part of the engine.

Are you on Korider?
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amnesia - Never in the history of usernames has one been more accurate. Warped indeed. You sir are a fecking oddball.

[captainmoore]

Hello all. To those who may have been following this thread I can now tell you what was happening. Firstly the clutch slipping was causing the bike's rev's to spike whilst loosing power. This problem has been solved with a spanner and 15 minutes of tinkering to get it right. Thanks for your suggestions.
The other "sneezing" problem was more serious and I'll just explain that the sneezing was not an air escaping noise as I first thought but metal tapping / scrapping on metal many times in a short space of time, like an instant rat-a-tat-tat. Turns out it was the chain coming loose with the sound coming from the front sprocket. It had become stretched in a small section and so was easily overlooked. Now with a new chain and sprockets I have not encountered the problem since. I wasn't aware how short a life span chains had but also and to any fresh bikers out there. Make sure to test the flex of the entire chain when doing a routine check, don't just tap it with your boot as you go into the house.
I hope this helps anyone else who might be experiencing similar issues. Thank you all for your help and suggestions, it feels good to ride out in confidence again. Take care

[flumpy7]

Glad you got it sorted. Have you been properly maintaining the chain? Regular adjustment and lubrication will prolong the life dramatically. IMO most of your symptoms seem related to the chain being too loose and struggling to stay on the sprocket at low revs. Make sure your chain is tight enough by measuring the play halfway between the front and rear sprockets. A loose (or tight) cahin is actually pretty dangerous.
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2012 Sinnis apache