14 replies to this topic

[jpw1275]

Hi...... Is it possible to take the spindle bushes out of a su carb yourself at home without any special tools and refit new ones?

Cheers James

[ACDodd]

Which carb?

 

AC

[jpw1275]

hi ac..... sorry... twin 1.25" su's

cheers james

[jpw1275]

im wanting to refurb a set but i see no point in new gasket kits etc if the spindle bushes maybe worn

cheers james

[carbon]

Often it is the spindle which gets most of the wear, have you checked the fit of a new spindle in your existing HS2 bodies?

 

Replacing the bushes is reckoned to be a tricky job, as the body needs to be drilled out then reamed to size for interference fit with the OD of the bush. This has to be done so that the bushes are in exactly the same location as the original holes for the spindle, and aligned. Not trivial.

[jpw1275]

hi carbon.... no i havnt tried the new spindles in as im waiting for a full rebuild kit to arrive.... how will i know if there is wear in the spindles... am i looking for movement within the bushes with just the spindle in place and not tightened up etc

cheers james

[ACDodd]

HS carbs need machining as shown here;

 

[ACDodd]

Basically in line drilling and reaming. Happy to do this for you £30 the pair inc return postage, you need to post you butterfly's spindles and bushes together with the carb bodies.

 

AC

[jpw1275]

cheers for that ac.... i will be in contact when i have everything in hand

cheers james

[jpw1275]

ac.... am i better vizzarding the spindles before or after the rebushing

cheers james

[ACDodd]

Fit bigger carbs instead.

AC

[Scoop77]

Vizarding is much cheaper!
Do it when you get them back.

[Scoop77]

HS carbs need machining as shown here;
 

Love the use of the old head :)

[jaydee]

AC is right, you can work the carbs to the point it wont even sit on idle but a bigger carb will still outperform it..

[ACDodd]

Its not the airflow that holds the engine back its the speed of the pistons in the carbs that is the limiting factor in the operation of the SU. The only way around this is larger pistons which means larger carbs.

 

AC