SU Carbs

[ianedwards]

Lol, maybe that's why I've never been able to get it running as nice is it is now with out that pipe on.

I've never really been happy with how it was running, always thought there was something not right.

I'll get rid of the return pipe and make a new over flow pipe up going down out of the way. And see how that goes.

Cheers, I'm such a dumbass, I hope that's it sorted

[ianedwards]

Afternoon, I'm still having issues with my carb. Even tho it is running lovely, it still decides to idle high some times. Thinking it might be the naf spring as I've checked everything else. But just realised you can have different length dampers. I've got two here

Lzx 1511 (currently on) + lzx 1773

Does any one know the correct damper that I should have, as I'm wondering if I've got the wrong one in.

Cheers

[dan_2k_uk]

I can check what's in mine if I get a moment when I get home

[dan_2k_uk]

I doubt there is a correct answer to this as the performance of different dampers will vary by dashpot oil weight and as the carb was never original equipment we don't have a correct one anyway.

[djc]

I couldn't find a checklist of bits to do an SU swap - it may be useful if doing one the first time.
Just about to do an SU swap on my 1.3 (currently running a troublesome Aisin). I did my Sami a while ago and learned from that to have every single bit to hand and ready. Got almost everything I need now and there is some work to do before fitting.
Here's the list, may be a bit OTT but there's big money in the carb and manifold alone so cutting corners on the small bits is not worth it to me:

- one known good SU44 with red spring and BDL needle
- one modified inlet manifold (Rockwatt)
- inlet gasket
- new thermostat (there are 2 different seats and the stat comes with the adapter rubber seal, plus why not)
- choke cable and nipple bolt
- throttle cable parts - SJ std one for the 90 degree guide, and a bike cable (I think - will look more closely once I have the new carb)
- Ali tube and plate (57mm thick-wall tube, 6mm plate, fabricate air inlet from filter)
- K&N filter 70mm
- 70mm hose
- J-clips, various but quite a few small (12-18mm approx).
- breather filter
- inline fuel filter (optional, nice to see the carb is getting some)
- 6mm and 8mm fuel line also used for vac advance, and clear 6mm for overflow to atmos
- sheet steel to fabricate throttle (and maybe choke) cable-mount brackets
- gasket material (carb intake side)
- offcut to make bracket to mount K&N near wing
- workshop odds and sods - I recall an M8 or two to blank a water line up to old Aisin, gasket sealer etc.

Looking forward to some decent cold starts and a bit more than 3bhp when pulling away cold... that'd be nice.

I think that might be it, prob missed some small thing - but this time I intend to be well prepared before starting

[ScottieJ]

Personally I would use a different filter, the standard air box is better than a k&n. K&Ns don't filter very well.

[Anton]

I have a K&N pod filter and I can see through it. I kid you not, I can see daylight through it. And yes, it's a proper K&N filter.

They're great for keeping leaves out of your engine. Not much else.

[SlimGrim]

They're great for keeping leaves out of your engine. Not much else.

[ianedwards]

Lol, think I've got a mini filter on mine, seems to work quite well.

Any way

I replaced the spring and damper, It seems to be running a lot smoother.

Took it for a run and it feels much better than it did, seems to rev better and goes great, and best of all once I got back its ticking over like a purring kitten. So hopefully I've sorted it for now lol. Fingers crossed I can use it now and not worry but time will tell.

Cheers for your help

[Gilly_SJ]

Apologies for the needy first post, I'll be sure to introduce myself properly.
I have just bought an SJ413 with a half finished 1.6 8v and SU HIF 44 conversion.
Long story short the carb is toast and needs rebuilding, however I've found 10 kits on Sucarb.co.uk, I'm planning on calling tomorrow but wondering if someone knows what the difference is between kits?

If anyone is interested the throttle spindle is badly scored, and it's missing the retaining washers for the rubber seals on the ends of the spindle. Hence a pretty substantial vacuum leak!