All of a sudden Im getting lots of vibration from my rs125

[colin1]

Was out on a little ride and then suddenly I am getting lots of vibration. I notice it in the bars, but it seems to be coming from the engine.

I felt something very similar when I test rode a rs250 a few months ago but wasnt sure if there was something wrong with the bike or if it was normal.

A friend says its might be engine mounting bolts loose.

Im tempted to just take it to the garage but thought I should ask in case anyone has some ideas as I cant be sure the garage will know what to do.
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[stinkwheel]

Is it making any odd ticking, clunking or clattering noises?
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[Akiraprise]

most possibly engine mounting bolts. or could be anything loose - I had a 'minor' vibration that I Took to the garage (luckily to get other stuff done) and it turned out my indicator was loose - that's it - its probably best to take your fairings off - start the engine and try find where it's coming from - no point in spending a load of money on a garage to find a vibration - unless it's goingto be a big problem...

goodluck

[colin1]

nothing unusual
it does this a bit after gear changes but has done this for a while

for a second I thought you might be thinking its the gearbox, but the vibration is when its in neutral aswell, not just when in gear

the guys on 125sportsbikes reckon its engine mounting bolts, and ive got my mate to point them out.

I will try tightening them myself and if that doesnt work, I'm taking it back to the garage that recently had the engine out so they can see if they didnt tighten the bolts properly afterwards. I will be polite though as it could be something else.
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[OreoXX]

My NSR also has some odd vibration, and it just started recently. I have no clue what it is, but it might be the same problem you are facing. Report back when you figure out what the problem is, and I'll do likewise if I find the problem with mine

[veeeffarr]

I have odd vibration too on my CG125... Sounds horrible.

[colin1]

I had a bit of a look for engine mounting bolts but could only see two
I have dropped it off at the bike garage and hinted that i suspected it was a loose engine bolt from when they did a top and bottom re-build

I need a new tire anyway

I am hoping they are just gonna charge for the tyre and fitting of it, as i suspect that the vibration thing is their fault.

If they charge me for fixing the vibration without convince me it wasnt their fault, I'll use a different mechanic next time.

I will report back on what happens
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[colin1]

Ive picked it up and although they say they havent charged to tighten the engine bolts, they seemed to have charged a lot for the tyrte they fitted.

£120 to fit a bridgestone battleaxe BT090F 110/70 R17 M/C 54H

a friend has told me this place dont have a good reputation and that another place charges £80 to supply and fit a tyre. maybe my tyre is a bti more expensive but id be surprised if it was £40 more.

more annoyingly, although the vibration is reduced, its still not back to normal

I may be selling my bike, but if i keep it, I will ask another place to look at the vibration when I get my chain and sprockets changed.

Its a shame cos I thought I'd found a good place as they were better than other places I've been to.

If they struggle to get it right on a relatively simple 2 stroke, I wdnt want to trust them with a sports 600.
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[Kickstart]

[Finglonga]

[Kickstart]

Hi

Good call. Forgot about that.

There are a pair of plastic gears that drive the balance shaft and these are service items. They are specified to be replaced (forget the exact mileage, 15000km rings a bell).

All the best

Keith
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[priller]

[Kickstart]

[Aikman666]

Yep all the AR6 engines have balancer shafts, same engine that is used in my rx if you need the manual, ive got a .pdf file for the engine, gimme a pm if you need it, good luck
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[Kris]

My NSr started vibrating really bad after a spill. Found out at the garage that the engine was being held in by one bolt after the others sheared off.

I'd try that first.
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[kenny]

it is a strong possiableity that it is the mounting bolts as 2 strokes vibrate alot more then 4 strokes which means stuff often come lose just take out the bolt completely and add some nut lock (locktight) to the end of the bolt and replace and torque up to the right torque if you can

use the blue nut lock i think the green stuff might be a bit to strong for them

hope that helps
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[colin1]

thnx guys

maybe the plastic gears on the balancer shaft need looking at as my bike has about 23k kms

maybe i should ask the mechanic to put the engine bolts on using nut lock (loctite)

I hope my bolts havnt come off and that I can trust the mechanic to put the right ones in as I dont think Im up to the job really.

Will it do any damage if i go on a 4 hour ride this weekend if any of the above are a problem ?
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[lilredmachine]

130 Dunlop GT501 rear for the MZ was £82 fitted to bike, front was £71.
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[Aikman666]

The balancer shaft is only there to reduce vibration, if its a problem with that, other than it vibrating like a normal 2stroke would, i dont think it would do much damage.
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[Kickstart]

Hi

If it is an engine mounting bolt then possible you will wear the mounting holes to an oval shape.

Short term you will probably get away with the vibration. Longer term it is going to put extra stress on many engine components (eg, crankcases). Also remember that depending on how the gears have failed you could have a load of bits of plastic floating around in the crankcases.

Just checked the Rotax workshop manual and it says to replace the balance shaft drive gears every 15000km.

All the best

Keith
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[colin1]

probably that then, and im regretting being a bit blamey with the nice mechanic

thnx for the advice guys
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