Classic 50 float settings?

[sea chief]

hello, i have a 86' merc classic 50 (45), my carbs have been rebuilt, but still have a fuel overflow problem. So, I tore the carbs down, needles and seats looked fine. My question is, should the needle spring have quite a bit of pressure on it? as i have it set now, the spring is almost collapsed in the level float position, this seems excessive to me, but bowl is still overflowing? Should the float contact the spring in the down, or open position? should i put more pressure on the needles in the running, or level position? also, i have found out that the seats are not replaceable, what is an accurate test to conclude the seat is in fact shot? what pressure should the fuel pump make @ idle to pressure test the needle/seat ?

Thanks, any help would be great!!!

 

[Laddies]

Re: Classic 50 float settings?

The springs are a given length don't try to stretch them it will alter the point the floats close the needles heres the sittings

 

[sea chief]

Re: Classic 50 float settings?

thanks for the diagram, now im getting somewhere. So, with the float properly set, should the spring be collapsed, or just touching the spring? as i have it now, the floats are properly set, and the spring is collapsed (putting sufficent pressure on the needle, and it still leaks? floats test out good, needle rubber is in good shape, and brass seat looks perfect...HELP? am i getting too much fuel pressure somehow???

 

[Yepblaze]

Re: Classic 50 float settings?

I've seen carbs leak past the needle/seat section. Either by a crack, or poor carb body construction.

 

[Laddies]

Re: Classic 50 float settings?

Just the weight of the float is what you set the height with.