just got a 2012 model its got jitsie pre filter aswell as standard air filter set up, but it seems a very noisy intake and i find it little annoying are they noisy with standard air box lid, has anyone got picture of normal air box top as i was thinking of maybe masking off some of jitsie filter to reduce noise but without reducing air flow thanks

Try a TYZ 250 slurping hoover for irritating intake noise, On both the yam and the ossa I suspect the noise is made by waves in the inlet air causing the airbox to resonate and there is probably not an easy cure for this without airbox design incorporating stiffening ribs or baffles.

Edited October 5, 201411 yr by dadof2

They are noisy with the jitsie or the rubber cap. I prefer the jitsie as it acts as a pre filter and keeps the main filter really clean