GV125 Transmission Noise Diagnosis?

[Moustache Man]

 

I can hear a slightly ticking noise coming from the left side of my GV125 2016 model.

When i first start the bike, the noise is barely noticeable, but it gets louder as the bike is used.

The noise goes away when the clutch is pulled in, but comes back when the clutch is disengaged, in any gear and in neutral.

It does sound like bearing noise, as with higher revs, it makes a “zzzzzzzziiiiiiieeeee” noise, like a bearing being spun very fast, but not quiet.

Although it could be something serious, if im going to be honest, ive been riding here and there to shop for food with this noise, and the bike hasnt had any major issues or performance losses. I am getting it serviced soon but i thought id try and diagnose it myself.

Any help would be amazing, thank you very much.

[♠️ MARCEL]

Can we get any history of this bike?

4K = clearances must be done and tensioners inspected , the newer slim head tensioners come in 2 shapes | 1 has a blunt silver end (most lethal) | and later gv125 engines which even the GT’s use too, have cury dark tip tensioners

Loose clearances = makes a r-r-r-r-r-r-r-tat-tat-tat sound as it gets more revs (sometimes) and sometimes during idle.

Some valve little valve chatting is okay

An eeriely very very quiet top end means it’s probs tight clearances and that’s more lethal.  (heat expands and wants to close the gaps between the cams , but the cams need some little gapping, aka clearance while the cam lobe spins and hits the tappet buckets)

Popping off the top valve covers , then shine down a torch behind the plastic chain guide , u will see if the tensioner has a dark or silver tip and let us know don’t touch anything though!

Next = if you hear sounds near the clutch basket and it changes when you pull in and out from your lever, consider changing your plates (it’s usually at 4k intervals for cheap stock plates, they had to save money i guess) , last you my want is a 1 out of 5 plates cracked, i’ve been there. but the bike was okay to ride, yet once i took off the clutch , the plates where worn down for real.  Not surprising , 2 pistons and a heavy girl does tend to tax the clutch a bit.

See how you get on!

Could also make another video, so i can take a 2nd listen, go around the bike and find the loudest spot that’s making noise even top end , down to bottom end, go behind the cam tensioners(! can’t stress these things lol)

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

[Moustache Man]

Thanks an awful lot Marcel, the help is much appreciated! Im sending it off to a mechanic on Wednesday, and in these current situations it probably won’t be ridden until then.

I might fire it up tomorrow and take another video, which might give you a good idea on where the noise is, but the noise is loudest on the lower left side of the bike.

And the noise can only be heard after riding the bike for 10 mins, when the bike is started for the first time that day, the noise is not there. Must be something to do with expansion of something, as you mentioned above.

EDIT – the bike has 2500 miles, so not a lot. Its a shame that it is making a noise already, the previous owner used it for 200 miles and had it sitting around for half a year.

Many thanks though :))

[♠️ MARCEL]

2500 is awfully young, i hope it’s just the front cylinder tensioner as it does sit directly above the magneto side on the left of bike but i wouldn’t know what design tensioner was put inside from production  (early bad batch one or updated one) –  If it has warranty, i guess the dealer must fix it on the spot.

Also beyond 600 miles run, the “clearances” must be checked before 4K as all the parts have started to wear in etc,  if anything was off before 4K, that’s the dealer to fix it without you footing extra bill.

See how you get on but it would be a nice excuse anyway to get her opened up early on and just change them things anyway and get all 8 tappets done, chains checked, if the mech doesn’t charge silly labour rates or take shortcuts (i dislike them when they do this to customer bikes)

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

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