Pipe

Cool, clean, unimpeded air flow is exactly what an engine needs to give it's best performance. Perhaps it is time for a close inspection of the air-filter assembly and inlet tracts? Look for cracks in the air-filter case, ruptures or partial blockages in the hoses and particulates attached to the inlet tracts spoiling air-flow to the carburettor/s. And, of course, renew the air-filter cartridge without fail.
This component and perhaps some of those below maybe required?

4NK1358600
4DN1357500
4TR1347401
4NK1359600
9046713123
9046713133
4NK1441100
4NK1445100
4NK1445100P
4NK1445101P
4NK1442100
9770750130
9770750530
4NK1445300
4NK1443700
31A1441900
31A1443500
9046054085
9046054137
90445115J9
90445112E1

Add as many air-filter and intake components(or anything else you fancy for that matter) as you wish to the same shopping cart, new blind plugs 16G1356900 clips 9046710039 9046711106 and seal 4NK1445200 for example, and still only pay the same single fixed price shipping cost.

This part may have other applications within the Yamaha model range.