Sticky on opening page of this forum contains a link to download genuine Yamaha manual for your bike.
It is brilliant in detail. Carb section 5 page 13, says 7mm. Thump*3 method interesting.
But your problem is more likely due to old fuel. A fuel stabilizer can help prevent gum and varnish deposits caused by stale fuel.
Happens in the classic car / bike world and very good for business.
p
|