Throttle spindle play on SU's

Post by **rolesyboy** » Fri Mar 20, 2015 11:49 pm

Hi All. I have a pair of SUs I am just rebuilding with a kit from Burlen. I have a very small amount of play in the throttle spindle if I wiggle it in the carb body. Would anybody be able to indicate what is deemed acceptable? When you rotate the butterfly to the open position there is a mm of movement side to side although I reckon this is fine. Cheers. Mark

Post by **Spider** » Sat Mar 21, 2015 2:25 am

The Axial (side to side) movent you describe is fine, what you don't want is Radial (up and down) movement.

Post by **rolesyboy** » Sat Mar 21, 2015 8:36 am

Thanks Spider. Well that means I need to get them rebushed. What is involved? Can any machine shop do this or does it need a specific set up?? Cheers. Mark

Post by **swifty** » Sat Mar 21, 2015 9:29 am

Mark I've just rebuilt a set with a burlen kit supplied by minispares and it came with two oversized little bushes in the kit just incase you need to re-sleeve the spindle ...... Mine didn't need need to be re- sleeved so I have the bushes still if you need some . ..... All the best your favorite ken in the world ...

Post by **rolesyboy** » Sat Mar 21, 2015 11:13 am

Cheers Ken. I have the bushes but haven't got the faintest idea of who/how to fit the b'strds. Trying to avoid sending them to Burlen if possible as want them done ASAP.
Thanks for the offer. And yes you're my favourite...

1071bob · Post by **1071bob** » Sat Mar 21, 2015 11:48 am

You have the drill out the bodies to take the spindle bush, best done on a mill for accuracy. Make sure you drill just deep enough to take the bushes from each side of the body, don't drill all the way through the body or you'll end up with a high tickover as the air rushes around the gap at the end of the bush! happens a lot according to the guy at Burlens.

Post by **rolesyboy** » Sat Mar 21, 2015 12:40 pm

Thanks for the advice Bob. Are the bushes regarded press fit? Do they need reaming afterwards??
I haven't got the foggiest idea and need to communicate this with the machine shop. (I am fairly certain that i would have ended up with them drilled right through had you not mentioned that so thanks)

1071bob · Post by **1071bob** » Sat Mar 21, 2015 1:16 pm

Here is the Burlen technical info:-

http://sucarb.co.uk/technical-h-type-ca ... nd-brushes

The bushes don't need reaming.

mk1-forum.net

Throttle spindle play on SU's

Throttle spindle play on SU's

Re: Throttle spindle play on SU's

Re: Throttle spindle play on SU's

Re: Throttle spindle play on SU's

Re: Throttle spindle play on SU's

Re: Throttle spindle play on SU's

Re: Throttle spindle play on SU's

Re: Throttle spindle play on SU's