big transmission problem i cant figure out

thangos · L Plate Warrior Joined: 24 Oct 2015 Karma :

so 4 days ago i was riding on my chesterfield aprilia rs 125, when, downshifting rev matching into first gear at 7k rpms, engine braking worked for the first few seconds, but when i got back on the gas the bike acted like it was in neutral. neutral light wasnt on. eventually i came to a stop and the bike felt like it was stuck in neutral, although i could only go down 1 and up 5. you could feel the clutch slipping especially in higher gears. eventually i left the bike to some old fellow who offered to help, i came back the day later in case clutch plates were stuck but, sure enough, it was just like the day before. 2 days later i picked it up with a van and after getting it out of the van everything started working properly again. i was quite sure it was going to happen again and, as a matter of fact, 40 kms later, after releasing the clutch, it happened again. i found out that if i put the bike in neutral and roll it backwards eventually i will hear something snap and everything will work fine again for a while. anyways, today, with the help of my father, who is more mechanically inclined than me, we opened up the clutch casing, cleaned it, and my father limed something in the clutch case which was supposed to help solve the problem. instead, its got worse, it happens almost every 3kms now even while just giving it gas.
i want to add that im running 75w90 oil, with some 10w40 diesel oil added to it ( i was fairly certain that was what caused the problem in the first place, but i dont understand why rolling the bike backwards in neutral would help) more 10w40 oil was added today, which makes me even more convinced its that thats causing the problem, but still, wouldnt explain many other things.
i am really struggling to figure this out and it pains me i cant ride this wonderful bike, anyone has any ideas?

Robby · Dirty Old Man Joined: 16 May 2002 Karma :

Somewhat hard to work it out from that wall of text, but I think the concise version is that your clutch is slipping, or not engaging at all.

Obvious things first. Make sure the clutch level, cable, and actuating arm can move freely and you have the correct amount of free play in the cable.

thangos · L Plate Warrior Joined: 24 Oct 2015 Karma :

Nobby the Bastard · Harley Gaydar Joined: 16 Aug 2013 Karma :

Does the apprilla have a slipper clutch?
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

Old Git Racing · World Chat Champion Joined: 08 Aug 2009 Karma :

Strip the clutch down, wash all the plates in petrol or replace the fibre plates then wash out the casing and refit the plates. Make sure the basket isn't badly notched and refill with the correct specified oil without any additional diesel.

OGR
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2022 Tiger Sport 660 2019 Street Twin 2003 K3 gixxer 1000 1998 Srad 600 track hack

Undinist · Nearly there... Joined: 08 Oct 2013 Karma :

That model is renowned for smoking - make sure you don't get down to the filter. Trade it in for an Alitalia one if you can, no smoking at all with those.
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Current bike: K1100RS. Previous: CD200, GSX250, GT550, VFR750, K100LT, K1100LT, R1100GS, R1150GS, ZZR1100, Hayabusa, RSV Mille, MV F4 750S, R1, ZX-10, KTM Adventure 950S

Ariel Badger · Super Spammer Joined: 02 Dec 2006 Karma :

thangos · L Plate Warrior Joined: 24 Oct 2015 Karma :

ordered new clutch springs, clutch plates, 75w90 bardahl transmission oil, im basically gonna rebuild the clutch almost fully as soon as the parts get in, hoping that will solve the problem