ESE's works engine tuner

[husaberg]

2 strokes on overrev with closed throttle as well as the engine being driven by a wheel and rider or a drum on a Dyno do not get any significant lubricating oil. 4t's survive this better a most have positive lubrication systems not reliant on a petrol mist.
Honda for the 2ts at least (but pretty sure XR and the like also) used to colour code roller cages the big end even own the commuter bikes like H100's offer many different specs std for selective fit ,after market not so much.....

Wobs way is obviously the preferred method
but different Honda ones used to be on one of the first few pages in the parts fiche.



Bell devotes a lot of space into how to build decent big ends and cranks in his book

[Wos]

2 strokes on overrev with closed throttle as well as the engine being driven by a wheel and rider or a drum on a Dyno do not get any significant lubricating oil. 4t's survive this better a most have positive lubrication systems not reliant on a petrol mist.
Honda for the 2ts at least (but pretty sure XR and the like also) used to colour code roller cages the big end even own the commuter bikes like H100's offer many different specs std for selective fit ,after market not so much.....

Wobs way is obviously the preferred method
but different Honda ones used to be on one of the first few pages in the parts fiche.



Bell devotes a lot of space into how to build decent big ends and cranks in his book

Cloed Throttle...

The more important is to have a well tuned idle jet/ airscrew to be not too lean there...

[koenich]

Re winning with Motul 800 - if thats the case then they are not pushing the mechanical/thermodynamic limits, but in every case they are leaving power on the table.

We are talking 8h endurance racing - depending on the year we had differences of ~15 °C ambient temperature from start of the race 11:00 am to noon. Even if the weather is supposed to be stable, I wouldn't jet on the edge as a part of risk mitigation to make it the full race disctance.