4 replies to this topic

[rocksrock]

Being very new to trials riding and coming from an enduro background where all oils are synthetic, I'd like to know why people recommend non synthetic oils for the gearbox?

Edited by rocksrock, 22 July 2009 - 07:58 AM.

[NZRalphy]

Cos we are cheap. Lots of us use ATF or regular gear oil and change it often, rather than buy an uber expensive gear box oil..... that are better and last longer. Remember that our bikes only make about 15hp.

Edited by NZRalphy, 22 July 2009 - 09:11 AM.

[JanDyb]

rocksrock, on Jul 22 2009, 09:57 AM, said:

Being very new to trials riding and coming from an enduro background where all oils are synthetic, I'd like to know why people recommend non synthetic oils for the gearbox?

Hi

What I know is that early Pro`s clutch fibres was destroyed by the additives in synthetic oil. Espesially when mixed with break fluid and coolant. Because of the construction of the engine this was not a question of "if" it was "when".

Status now I am not sure of, but I know new Pro`s are delivered with GRO Gear Extreme 75W wich is a mineral oil.

-Jan

[pandelboy]

synthetic oils are not condusive with the surflex clutch plates , it can make them swell up . gas gas recomend mineral oil and most people use dexron Dii atf which is mineral based and also cheap.

[rocksrock]

pandelboy, on Jul 22 2009, 11:57 AM, said:

synthetic oils are not condusive with the surflex clutch plates , it can make them swell up . gas gas recomend mineral oil and most people use dexron Dii atf which is mineral based and also cheap.

Thanks for the info gents - How are the surflex clutch plates different to the cork or kevlar plates used in the enduro/off road bikes?