mikuni low speed screws ????

[bognorvegascrew]

ive had problems with my BN44 carbs from my gp800 , my low speed screws were seazed in , ive finally got them out and cant get the new ones in , i think that maybe theres some dirt or rust or god knows left in the holes, the old screws came out hole so theres no screw left in there. been told i can get a tool that screws into the holes and cleans them as it screws in , but i dont know the measurement been told that for example it could be 3 x .80 etc but cant find exact screw info . can anybody give me any advice on this

[GPkiwi]

Re: mikuni low speed screws ????

Not sure on the thread size, but you will need to run a "tap" to clean up the threads. I guess the carb's are in bits so you take the part down to a good engineering shop and ask for one to suit.

A "tap" is what is used to cut threads for bolt holes and a "Dia" is used for making threads on bolts etc. Have you heard of a "Tap and Dia set"?:)

[bognorvegascrew]

Re: mikuni low speed screws ????

yer ive got a set from a friend with me but it doesnt contain the correct bit, it has all the sizes printed on them , but i was after the size so i could go out and buy the correct size . engineering firms around me have history of breaking parts so would like to try myself if poss

[GPkiwi]

Re: mikuni low speed screws ????

You could just take the screw with you and and they should tell what thread it is.................I'm shocking on threads etc, not much help but that's what I would do unless someone chimes in.

[anapg77]

Re: mikuni low speed screws ????

My SBN 38s used either 5mm X.75 or 5MM X .8.

Don't know if they are the same.

Make sure you get thread forming and not cutting.

Hit up jetskisolutions.com. John can get ahold of what you need.