Clutch problem

[Joe Banks]

Morning all,

Have changed the clutch plates on my GV 125S after they started slipping. Went through the gears on the road went from 1st to 3rd, missing 2nd, to 4th to 5th and on to 6th. got up to around 48 mph and slipping started again. Any ideas where 6th gear came from or 2nd gear went to? Or why the slipping is happening with the new plates.

[♠️ MARCEL]

Hmmm, i got Just a few questions to build some understanding & hopefully we can see why it’s doing what you describe;

• What oil did you use ?   and what grade ?  20w60 ? 5w30?
• Did you change the oil filter ?
• Did you adjust the cable ?   (Remove the cable from the clutch cover , then make sure the arm doesn’t have too much play going on ?)
• Does the clutch make any noises when you squeeze and let go of the lever when running idling ?
• In regards to sixth gear, can you shift each gear like you normally would until you hit 6th or does it jump back to 5th gear etc  (gearbox issue than clutch)
• Look at your front sprocket  (check for rattle or loose nut)
• Chain tension does affect how smooth your gears shift believe me.
• Also grease up the linkages for the foot pedal shifter assembly that’s going to the engine arm/hook.
• Confirm it is a GV125 Carb model (GV125C)  or   GV125S EFi injected  (because you put S in your topic but profile says C)

// Meditation doesn't mean you have to sit still....

[Joe Banks]

Hi Marcel,

I used 10/40 oil

Didn’t change the filter.

Front sproket is good not loose.

Cable adjusted when linked back to the clutch casing.

Gears shift smoothly.

On the dash it shows gears go down to 1st, up to Neutral, up to 3rd (doesn’t show 2nd ) up to 4th 5th and 6th.

When accelorating all is good up to around 48mpg then slipping starts.

It is a GV 125S efi , new last year.

[♠️ MARCEL]

It’s a shot,  try this now: Slipping can sometimes be the incorrect oil used (weird enough)

• Motul 7100 10w50 grade  (recommended oil for vtwins)
  or
  Silkolene Pro 4  , 10w50
• Fresh oil filter
• When you drain the oil, see if the magnet plug under there has had any oil deposits ?
• Also if the mechanic in the past ever removed the wrong plug under the bike ?   (there is 1 for oil drain, and the other is gearbox related that shouldn’t be touch,  there is another near there for oil pressure checking for mechanics to see if the oil pump works OK)
• If it slips, check how much “free play” the hand lever has before squeezing the clutch, the gap should be about credit card side thin gap of free play
• Also the “arm” that is on the clutch casing should be retracted all the way back,    then refit the cable in to it, so even though the arm is neutral , it could still be pushing against the plates making you feel like you’re riding half-clutch , and thus the new plates wear down even faster , so it might be a good shout to double check the plates inside have not prematurely cracked or anything.

keep us updated

// Meditation doesn't mean you have to sit still....

[Joe Banks]

Thanks Marcel,

Will get back to you when shifts allow and oil and filter are delivered.

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