Carb tuning

[stebec]

I have just rebuilt my HS4 Carburetors, what is the best way to tune them? I have the jets, level with the bridge, I've watched you tube videos but all seem to tune them different ways.

Steve 

[Pete Lewis]

with the head of the jet level to the bridge  i would drop the jet 3 turns as a basic starting point  when running and well hot 

then adjust the jet up or down in small movements to give the best idle   then reduce the idle to around 700-800  and fine adjust again .

to balance loosen the connecting rod clamp, back the idle screw of and turn to just touch the casting, turn in 1.5 turns and retighten the connecting clamp .after mixture setting adjust both screws to get a fair idle .

there is no dark art here .

do make sure the jets return fully after choke is used .

Pete

 

 

[Stratton Jimmer]

Using Pete's method is fine. I have a colourtune which I use periodically to check that the mixtures are right but tuning for best tick over is pretty much spot on. The final comment about ensuring that the jets reseat after use of the choke is spot on too.