Life saver, didn't notice my spindle was worn until watching this video. Glad to see no reaming is required hopefully mine wont need the bush repair kit as the spindle was only wobbling slightly. Thanks!
@@roundtailrestoration Update from my end, the spindle repair kit removed all of the slack it previously had, good as new! And as you correctly mentioned, there was no need for any bushes or reaming
@@isaacburlo9547 Great news, Isaac! Much easier job than I thought it was going to be when I did it, that's for sure. She'll run much better now, I suspect.
Glad to hear it, Jonathan. The throttle shaft replacement was much easier than I thought it would be. Makes a big difference, too. Hard, if not impossible, to tune the carbs properly with leaking shafts.
Excellent video, Chris! So nice to hear an explanation that makes sense. Not like that guy, who barely speaks English.... Alin.... Elain.... whatever his name was LOL. Keep them coming!
Now that I'm doing my Strombergs, I'm re-watching this video. The Strombergs have a brass bushing at each end of the throttle shaft which minimizes this problem. But -- they're not included in the standard rebuild kiit!
Nice little video but one small mistake at the start. The air leaking through the warn throttle shaft doesn't include fuel. So your comment that the worn shaft allows ‘fuel and air to leak’ is incorrect. Its only air leaking into the carburetor which doesn’t pass over the fuel intake jet so can't induce more fuel. In fact the additional air actually leans out the fuel mixture by mixing more unmetered air into the fuel/air mixture that entering the throttle body. This fuel/air is correctly controlled by the butterfly, needle and piston lift (controlling the needle position). Leaking air upsets all that balance. You can richen the fuel air mixture (via the nut at the base of the SU body) and this can help to some degree but it doesn't work particularly well because the additional leaking air isn't consistent (due to access through the warn shaft which is variable). Hence idle mixture will be a mess and hard to set correctly, the needle setting will be all over the shop and the poor fuel air ratio will cause flat spots at all rev ranges. Best replace the shafts as shown
Hi Jim. It's been a while since I've had them apart, but there is a seal on the jat bearing, I think. Nothing on the butterfly spindle (unlike other models that have a bushing). I'd recommend looking at Rimmers or SpitBits parts pics to make sure on the jet bearing.
Of course I typed "Sinner's Union..." Of course, it is Skinner's Union, started out as a gas station a loooong time ago. Sinner's Union is a whole different thing...And thanks for the vid, I am working on my 66 Spitfire which I have had (daily driver) for 39 years. Since it is just under 200,000 miles, I had the engine overhauled (3K miles now) and am now doing the carbs. Thanks for the great and easy to follow vid!
Lol, I noticed but figured you knew what you meant to type. Wow, that's awesome. Must be nice to have that much history with the same car. I was pleasantly surprised at how easy the job was to do. I'm going to tackle reupholstery of my seats soon...that'll be a challenge!
@@roundtailrestoration Good luck with the upholstery, that can be a challenge. I got the Spitfire in 1980, age about 30. Now at 70 it is even more fun! Our daughter is 35, when Iris, my wife, was going to give birth we went in the Spitfire to the hospital. I bolted a baby seat sideways in the back and we went on lots of drives. I lived in Santa Monica and composed music scores for TV/Film, and making CDs of my music - so the drive to the studios was fun - and of course, crowded! I also had a 57 Morgan and a 67 GT6. I was an orchestrator at Warner Bros and I had a reserved pkg place whenever I was doing a score - it was truly fun to come in with a different car all the time! We moved to Idyllwild, 6000 feet elev in the San Jacinto Mtns, pop 3,300. I simplified my life, sold the Morgan and the GT6 ( I miss them, but it was the right thing) and the Spitfire is perfect because it is so easy to maintain. With the internet, I am still doing scores and making my CDs. I started getting "successful" in the mid 1980, age about 35. I believe the age you feel, regardless of your "age" is when you just started seeing you dreams come true!
Life saver, didn't notice my spindle was worn until watching this video. Glad to see no reaming is required hopefully mine wont need the bush repair kit as the spindle was only wobbling slightly. Thanks!
Mine were really bad, but I had no wear on the carb bodies, just the spindles. Glad it helped!
@@roundtailrestoration Update from my end, the spindle repair kit removed all of the slack it previously had, good as new! And as you correctly mentioned, there was no need for any bushes or reaming
@@isaacburlo9547 Great news, Isaac! Much easier job than I thought it was going to be when I did it, that's for sure. She'll run much better now, I suspect.
Chris, you are my hero. Every step of my 64 spit restoration, you have a video helping me and giving me confidence
Glad to hear it, Jonathan. The throttle shaft replacement was much easier than I thought it would be. Makes a big difference, too. Hard, if not impossible, to tune the carbs properly with leaking shafts.
Excellent video, Chris! So nice to hear an explanation that makes sense. Not like that guy, who barely speaks English.... Alin.... Elain.... whatever his name was LOL. Keep them coming!
Well, it was the guy who can barely speak English that motivated me to start doing videos! Thank you!
Now that I'm doing my Strombergs, I'm re-watching this video. The Strombergs have a brass bushing at each end of the throttle shaft which minimizes this problem. But -- they're not included in the standard rebuild kiit!
(Duh, this is what I get for commenting 60 seconds in...10 seconds later you said this same exact thing. My memory is horrible!)
Nice little video but one small mistake at the start.
The air leaking through the warn throttle shaft doesn't include fuel. So your comment that the worn shaft allows ‘fuel and air to leak’ is incorrect.
Its only air leaking into the carburetor which doesn’t pass over the fuel intake jet so can't induce more fuel. In fact the additional air actually leans out the fuel mixture by mixing more unmetered air into the fuel/air mixture that entering the throttle body. This fuel/air is correctly controlled by the butterfly, needle and piston lift (controlling the needle position). Leaking air upsets all that balance.
You can richen the fuel air mixture (via the nut at the base of the SU body) and this can help to some degree but it doesn't work particularly well because the additional leaking air isn't consistent (due to access through the warn shaft which is variable). Hence idle mixture will be a mess and hard to set correctly, the needle setting will be all over the shop and the poor fuel air ratio will cause flat spots at all rev ranges. Best replace the shafts as shown
Thanks for your detailed reply. Keeping me, and the viewers, straight! And thanks for watching.
Are there any seals to replace in this carb or is it purely fit new spindle butterfly, jet bearing, needle & jet ?👍
Hi Jim. It's been a while since I've had them apart, but there is a seal on the jat bearing, I think. Nothing on the butterfly spindle (unlike other models that have a bushing). I'd recommend looking at Rimmers or SpitBits parts pics to make sure on the jet bearing.
SU stands for "Skinner's Union". I don't think they're actually still in business themselves, but the successor company is.
Makes sense. I knew there was something going on with the original company. The successor company seems to do a good job!
Chris Fisher I didn't know it before; I just Googled it.
lol. you had me worried there.
Dave, you have a Beast to fix. Don't waist your time googling non existing companies!
I was just trying to help! Would you rather me use Bing? My bosses won't like that.
Sinner's Union SU
Yup, thanks. I never forget it, now!
Of course I typed "Sinner's Union..." Of course, it is Skinner's Union, started out as a gas station a loooong time ago. Sinner's Union is a whole different thing...And thanks for the vid, I am working on my 66 Spitfire which I have had (daily driver) for 39 years. Since it is just under 200,000 miles, I had the engine overhauled (3K miles now) and am now doing the carbs. Thanks for the great and easy to follow vid!
Lol, I noticed but figured you knew what you meant to type. Wow, that's awesome. Must be nice to have that much history with the same car. I was pleasantly surprised at how easy the job was to do. I'm going to tackle reupholstery of my seats soon...that'll be a challenge!
@@roundtailrestoration Good luck with the upholstery, that can be a challenge. I got the Spitfire in 1980, age about 30. Now at 70 it is even more fun! Our daughter is 35, when Iris, my wife, was going to give birth we went in the Spitfire to the hospital. I bolted a baby seat sideways in the back and we went on lots of drives. I lived in Santa Monica and composed music scores for TV/Film, and making CDs of my music - so the drive to the studios was fun - and of course, crowded! I also had a 57 Morgan and a 67 GT6. I was an orchestrator at Warner Bros and I had a reserved pkg place whenever I was doing a score - it was truly fun to come in with a different car all the time! We moved to Idyllwild, 6000 feet elev in the San Jacinto Mtns, pop 3,300. I simplified my life, sold the Morgan and the GT6 ( I miss them, but it was the right thing) and the Spitfire is perfect because it is so easy to maintain. With the internet, I am still doing scores and making my CDs. I started getting "successful" in the mid 1980, age about 35. I believe the age you feel, regardless of your "age" is when you just started seeing you dreams come true!
@@peterdavisoncomposer That's quite a story, Peter. Probably not putting a car seat in the back of any Spitfires in this day and age! Awesome.
Skinners Union. SU.
Yeah, I eventually figured it out. Thanks for watching!