Mikuni SBN Carbs

[peter.nap22]

I bought your carb rebuild kit to refurbish the carbs on my 1999 Yamaha 1200 XL1200 Ltd. I downloaded your instructions to use as a guide. The first step is to remove the high speed and low speed screws.

My carbs do not appear to have adjustable jets. In the location of the jets I have what appears to be brass plugs. I asked three other friends to assist me, and I got three different answers, mostly which said I should drill out the brass plugs, and there will PROBABLY be an adjustable screw underneath the brass plugs.

Do I have carbs with fixed jets? Should I be drilling out the brass plugs? I can take digital photos if it would help. Please advise.

[Technical Support]

Re: Mikuni SBN Carbs

Yes, that model had plugs over the screws from the factory. Yes, just gently drill them out to get tot he screws and change the o-rings. Make sure you put them back in the same positions they are in.