Yamaha xs twin,rpm stiickinCarb # 2 is popping and plug is fouling, when riding after 4000 rpm bike hessitates

First the issue was the vacuume line from the petcock to the carb boot, it was torn so replaced that and bike was actually ridable. Now ppl said carbs were out of sync as the rpms were staying at 4000 rpm when you would rev and the carbs were popping and bike would stall. So i tried to sync them but no luck, when idleing, it will do a loud pop and stall. #2 plug keeps fouling, and when you ride it and hit 4000 rpm bike hessitates. Now i cleaned the plugs twice to continue working on it to see but that plug keeps fouling. So why the sticking rpms and pooping and hesitating? I cant find any other air leaks as i sprayed carb cleaner on boots etc. PLEASE! THANKS!

Yamaha xs twin,rpm stiickinCarb # 2 is popping and plug is fouling, when riding after 4000 rpm bike hessitates
ok your carbs need stripping down totally and everything inside cleaned, your carbs run a 2 stage jet system, 1st being the idle jet which runs up to 3 - 4 thou then as you accelerate your main jet takes over, so plug fouling no.2 , popping, hesitating, all points to dirty or blocked internal carb components. wash everything in neat petrol, access to a air line is good as you can use it to blow through the jets, check your float heights and reset if necessary, also blow through petrol feeds to chambers make sure theres no blockage, also clean your slides and needles, lift them one notch, rebuild and re- vacuum them up, set up your butterflies and adjust your throttle cables as you go, prime with fuel, then do a plug chop at 30 mph, again at 50 and finally at 70., good luck.
Reply:O.K. now I need a little info. such as XS400,500,650 or 750 twin?Procedures are the same for each.But each bike has it%26#039;s own finiky characteristics common to only that particular unit.Be careful taking just any advice on here.You could get more confused than before you started asking.Email me and I%26#039;ll tell you how to.



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