I need help setting up a dellorto vhsb34ld carb my bike as it just spluttors at 5000 rpm is it a mixing problem or do i rejet ? It came with a 160 main should i try diffrent mixture turns or lower main jet at £5 a jet im after any help i can get looked at diffrent forms but doing plug chops would be a pain anyone with any tips apart from just use old carb. Thanks for your support.