Aprilia RS125

[MADDOG]

Hi I got a second hand aprilia rs125 harada on an S reg i just got 110 out of it on the way to work then after a 6 hour shift went back set off and all of a sudden the were hugh vibrations so i got it hope and took the fairings off and checked the gaskets and the engine mount but no sign of any problems but its still louder and giving off large vibrations. as anyone got any i dea what it is or had the same experience
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Aprilia RS125 Harada. has gone now have a SV650s K5
Are you meant to scrape knee slides or rip them clean off?

[Rollins]

Vibrating at what speeds?

If it was, erm, 110, then it's to be expected as it's not designed to go that fast...
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"... I wouldn't mind doing 130 up to a T junction, but unfortunately my bike tops out at 120 which is gay..."
2005 CBR600RR

[MADDOG]

No it wasn't at 110 and thats not the fastest its been its had faster

it was doing 40 i changed down to go upa hill and started to accelerate when there was like a crack/bang the engine not changed and the whole bike vibrates viciously. it vibrates whilst in neutral and idleing and all other times i've had ppl suggest that i could have blown a piston ring or shook the exhaust off or blown a bearing in the gear box and bent my crank. from that i think its the bearing idea due to the fact that if it were the piston ring it wouldnt even rev if it were the exhaust it shouldn't cause any vibrations and if id have bent the crank shaft it would turn over or be able to be puched whilst in gear. but me being a novice i've no idea what it could be
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Aprilia RS125 Harada. has gone now have a SV650s K5
Are you meant to scrape knee slides or rip them clean off?

[freestyler_onli]

Mine had a few probs changing from 3rd to fourth- a loud clank and then the revs went apeshit- like 8000 then a clunk and back down to normal revs as if nothing had happened..........

[MADDOG]

yeah only it didn't go back to normal i just hope i can fix it before sunday as its got a date with a dyno test although a no power dyno would be a good comparison to a full powered one--- there you go sir we got a 400% increase on torque max BHP and 0-60 time
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Aprilia RS125 Harada. has gone now have a SV650s K5
Are you meant to scrape knee slides or rip them clean off?

[Kickstart]

Hi

How many miles has it done?

Under the clutch casing there are some plastic gears. Some drive the water pump / 2 stroke oil pump, another drives the counterbalancer. The ones for the counterbalancer are a service item (there replacement is specified in the service schedule). My guess is that one of these has stripped its teeth and now the balance shaft is not turning.

I would check this quickly as from the top of my head I cannot remember if you might also have lost drive to the water pump / oil pump (probably not as if so it would have gone bang quite quickly otherwise).

They are not that expensive from memory. M1ke can probably give you a better idea of price.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[MADDOG]

cheers guys i'll keep u informed of the progress work starts saturday mornign 6am sharp ( i need it sunday)
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Aprilia RS125 Harada. has gone now have a SV650s K5
Are you meant to scrape knee slides or rip them clean off?

[tony532]

you have had the bike go faster than 110 miles an hour

[Kickstart]

[MADDOG]

Wel done and thank you to kickstart

Ok guys I took the cover off of the clutch housing to find the plastic!!!! gear on the counter balance was half on it and half lying on the bottom of the cover so i thought easy i had a spare so ill just stck it on............

thats when it hit me i went to stnd up and cracked my head on the handle bars as i fell to the ground i noticed the timing marking on the crank and first shaft.. not so easy after all all i kneed to know is which one lines up to which thing in the casing. any ideas?


ill post picks of the broken part and the gearing when i get them off ma camera
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Aprilia RS125 Harada. has gone now have a SV650s K5
Are you meant to scrape knee slides or rip them clean off?

[MADDOG]

if you could reply asap as i need the bike tommorw its got a dyno test booked and i dont want to waste £35 im a student and thats alot of cash to me
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Aprilia RS125 Harada. has gone now have a SV650s K5
Are you meant to scrape knee slides or rip them clean off?

[loply]

Do you have an RS125 manual? if so i would imagine there is info in there. Search on google for one.
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Yamaha SZR660 Caution to the wind, the throttle pinned!

[MADDOG]