OzVMX Forum

Clubroom => Tech Talk => Topic started by: Bondi Rabbit on October 12, 2013, 07:34:51 pm

Title: YZ125x front fork oil ammount
Post by: Bondi Rabbit on October 12, 2013, 07:34:51 pm

I got the oil  seals off thanks to all for the help. the manual says 200ml or cc which I have done and then added the right PSI in  the air canisters , you know the big chambers on the top. Well no oil leak but the forks feel really spongey and I can bottom therm out by the  front brake. I don't have air leaks .It seems like i don't have enough oil , but welcome suggestions

Title: Re: YZ125x front fork oil ammount
Post by: Iain Cameron on October 13, 2013, 10:48:20 am

How much air and what weight oil . The Air is critical but once you have set them up these forks are great . Iain

Title: Re: YZ125x front fork oil ammount
Post by: Bondi Rabbit on October 13, 2013, 08:08:11 pm

I have used the 20w as per specs. No air leaks but hard to get accurate reading  with the foot pump . Maybe need a better pump

Title: Re: YZ125x front fork oil ammount
Post by: Iain Cameron on October 13, 2013, 08:39:35 pm

Yes The pressure is critical . oil measured from top with forks extended is 205mm or 8.1" pressure is . 120 to 160 lbs rider hi pressure  canister 51psi low pressure 29psi
160 to 190 lbs hi 56 psi low 29 psi
190 and over hi 56 psi low 32 psi
get your self a good gauge a mountain bike one is what I use .
Ive got the 125X 250C 400C Iain
pm me your email address and I will email you the Yamaha Tech Bulletin on the forks .

Title: Re: YZ125x front fork oil ammount
Post by: Bondi Rabbit on October 14, 2013, 09:32:57 am

Thanks Ian I have sent you a PM or alt least I think I have. Plus a load of other questions
regards Scott

Title: Re: YZ125x front fork oil ammount
Post by: Bondi Rabbit on October 15, 2013, 08:51:02 am

just sent it again Ian , not sure if I got it right