Petski,i have exactly what you said. When i start the engine,the downpipe of cyl 1,run colder than the others.... The jet i'm talking about,is where is the yellow arrow i draw...(see pic pls).At my carbs these jets are completly blind..and i dont know if it sould be this way or not...i cant even find it at the Yam manual.
Thanks a lot for your time and help peteski! All of my pilot jets are absolutely fine....i am allmost sure that its not a carb problem anymore...I follow your instructions today,about the spark plugs etc...I swap the cyl1 spark plug to cyl2,now i think that the downpipes get hot all together,still no so sure though.But the problem its still there. I also check the coils resistance,first and secondary,tps and all are in specs.I have allready change the spark plug caps to ngk sd05f(no diffrence),but as i saw today they are 5k resistance,and yams are 10k.I dont know if this cause any further problem,but nothing have change after all these changes and checks...I am starting to think valve clearence...
Plugs are between 0.7 and 0.8, i did mine last week.
To be honest they didn't really need adjusting at all.I spent ages at work with a vernier hunting for a washer that's 0.75mm so i can keep it in my wallet for future though. My K&N air filter has just turned up at work, finally, 11 days after ordering, so i'll pop that in tomorrow