1968 MGC Complete SU HS6 Carburetor Tune

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As many of you know I'm sort-of fond of the long-form video. I like to ensure that I don't leave anything out. To that end, this is my longest video to date... I appologize to those who don't require this much detail in order to accomplish a carb tune but as I do with most of my videos, I was learning as I went and I figure there was a lot of pertinent information that some other people might find useful.
If you wish to skip to a particular segment of this video I have included convenient links below. Please feel free to skip ahead to the part you are interested in. For those new to this who want to soak it all in, sit yourself down with a tall glass of your favorite beverage and get ready for a 50+ minute RU-vid marathon. Enjoy!
Initial actions (air box tear-down): 0:00 - 3:21
HS Carb Parts Description: 3:21 - 17:51
Initial Tuning Steps (engine off): 17:51 - 39:28
Idle/Mixture Tuning (engine on): 39:28 - end
The tuning instructions I used can be found here:
sucarb.co.uk/technical-hs-type...
and here:
sucarb.co.uk/technical-hs-type...
HS Carb Tuning guide: This is not produced by me but I did add the arrows/colors for clarification.
1drv.ms/b/s!AnVl9mnzz9OrgpVFB...
Carburetor Sync Tool:
As shown in video: a.co/1O7AWxh
Alternate type: a.co/3D52tcg

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Опубликовано:

24 июл 2024

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Комментарии : 52

@raymondmorgan5808 6 лет назад

Haven't had a MGB since the 70's. Great video. Extremely appreciate the attention to detail. Keep up the great work.

@JRsGarage 6 лет назад

Thank you for the comment.

@minimax1nz 6 лет назад

What a great video! the explanations, the shots, everything is great, really good job. Keep making content like this... also it really helped me with my Austin mini. Cheers from Chile :D

@JRsGarage 6 лет назад

You are welcome, happy to help.

@paulford2181 3 года назад

Once again JR this has helped me and given me confidence to tackle the tuning myself . brilliant thank you

@JRsGarage 3 года назад

Good luck, you can do it.

@tyee4u 4 года назад

It’s been said already but a big thanks. Great detailed video. I keep coming back to this again and again. Best SU tune video on the tube 👍

@JRsGarage 4 года назад

Thank you for the compliment. Happy to help.

@simonpotter2818 4 года назад

Extremely useful video thanks, I can safely say your engine bay is a whole lot cleaner than my '68!

@JRsGarage 4 года назад

My pleasure. Thanks for the compliment.

@mikelinehan7693 6 лет назад

thank you for this video, it will most certainly help me set up my hs4's on my triumph spitfire :)

@JRsGarage 6 лет назад

Glad I could help. If you have any questions not covered by the video please ask.

@abeghosh Месяц назад

It's a brilliant video ! Thank you ! This gives me confidence to have a go and tune my carbs !

@JRsGarage Месяц назад

Thank you. I’m in the process of updating this video but I’m waiting on a part from a supplier so I don’t think I will be able to publish it for several weeks.

@abeghosh Месяц назад

@@JRsGarage Hi - Please explain how to set / check the float level please - so much conflicting information - thanks

@JRsGarage Месяц назад

That’s actually the part I’m waiting on. New upgraded floats.

@hecklejeckle1333 Год назад

As @chormy stated… For setting each carb air flow you need to separate the idle adjustment screws (acting on both carbs) by loosening the two clamps bolts on the butterfly linkage shafts (in between the carbs) and then setting carbs air flow individually with each idle adjustment screw until the carbs are individually balanced with the air flow meter. After balanced then tighten the two shaft bolts locking the butterfly shafts together again (with correct clearance on the forks). Then each carb idle will stop on both idle screws at the same time Otherwise the two shafts act as one and only the idle screw turned out the most will have any effect on the idle and it will adjust idle of both carbs at the same time. So you just chase your tail. Any idle adjustment down with this screw will stop when that screw position reaches the other idle screw position If you adjust the idle after balancing the carbs ensure both idle screws are in same postion so both stop the staft in same position. Ajust the one that changes the idle to desired revs then screw in other idle screw to same position to match that one. Look up ‘SU Carb balancing’ in plently of other videos or online manuals.

@JRsGarage Год назад

Thanks for the information.

@TheDIDSBIAK 6 лет назад

Thanks for sharing. Well done 👍🏽😎

@markferrier6403 2 года назад

great job! very thorough and explained completely! thank you!

@JRsGarage 2 года назад

My pleasure.

@rodaleeeohsc7208 4 года назад

Very very detailed. Thank you for sharing

@JRsGarage 4 года назад

My pleasure.

@garyfisher7936 5 лет назад

Nicely done!!

@JRsGarage 5 лет назад

Thanks

@roselh1 5 лет назад

Extraordinary job! Much better to be long and detailed and then allow the viewer to skip parts if he/she wishes, than to do a short video with only highlights. Now if you could just make a similar video for HD carbs. Lots of commonalities though.

@JRsGarage 5 лет назад

Sorry, no HD carbs in my stable. Glad you enjoyed it.

@user-mr3pw3lb3k Год назад

Just. Need those informative MG C CARB TUNE SHEETS!

@JRsGarage Год назад

HS Carb Tuning guide. This is not produced by me but I did add the arrows/colors for clarification. 1drv.ms/b/s!AnVl9mnzz9OrgpVFB-sA4iGHshjP3A

@fredmatuszewski8051 Год назад

Very good job in explaining, John Twist films are too dark. You can't see what he's doing.

@JRsGarage Год назад

Thanks for the compliment. Also read through the comments below because some very wise people have given tips that I failed to address in the video.

@ronbean7243 6 лет назад

Nice explainable video, scope is good tool too, keep up the old work .

@JRsGarage 6 лет назад

Thanks for the comment.

@rbittmann1642 6 лет назад

This is the best and most complete HS6 carb adj video for my A-H 3000 MKII BJ7.

@RobatRobot 5 лет назад

I read it that the 1/16" slack should be in the cable before it moves the cam, not between the cam and the fast idle screw.

@JRsGarage 5 лет назад

Yes, you are right. After reviewing the instructions and the video I think I now have too much free play in the cable/cam before the fast idle screws are engaged. As a result my fast idle is probably set incorrectly. I plan to make a carburetor re-build video this winter and as part of that I will be re-making this tune video. I have come to realize there are several small errors I made or pieces I left out that I should correct.

@kevincantara5533 10 месяцев назад

A friend of mine recently bought a '68 MGC and is beginning the process of getting it running correctly. I would like to know if the manual you refer to is readily available for purchase online anywhere. I think it would be a great gift :)

@JRsGarage 10 месяцев назад

Yes it is: MG MGC Workshop Manual: AKD 7133 (Edition 2). a.co/d/e9BR8a2

@rbittmann1642 6 лет назад

Great Video - Where /How can I get the SU Instructions you followed - I appreciate the depth and detail you went to in your video - this is what armatures need to do a professional job tuning SUs. Thank You!

@JRsGarage 6 лет назад

It is cobbled together from the pages here, under "general", "single" and "multi". sucarb.co.uk/technical/

@JRsGarage 6 лет назад

I put it all into one easier-to-follow PDF. If you want a copy, email me: jr.s.garage.mgc@gmail.com

@roselh1 5 лет назад

JR, I notice that your MGC uses a cable to operate the throttle. I have converted my Austin Healey 3000 to cable from a mechanical linkage. I am curious about how the cable is connected to the accelerator pedal in the MGC. Are you able to point me to a parts manual diagram of the mechanism or some photos perhaps taken from your car? Thanks! Lin

@JRsGarage 5 лет назад

Lin, as requested... I am currently uploading a video that will show you the throttle cable mechanism both in the foot well and engine bay. I hope it helps. If you have any further questions feel free to ask. Video will be here once it finishes uploading: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-gZOHaWhafCM.html

@mikemrha9013 3 года назад

Hi JR, I have a 68' MGC that when accelerating cannot get above 50 Miles per hour or so, the mechanic helping me thinks the rear carburetor needs to be rebuilt; do you agree & if so can I send the carbs to you for rebuild or can you recommend someone in the US? Interested in your thoughts? The mechanic is not comfortable rebuilding my MGC twin horizontal 1 3/4" SU's type HS6 carburetors. Thank you!

@JRsGarage 3 года назад

I appreciate the confidence but I'm far from a certified mechanic and wouldn't feel comfortable working on someone else's car. I would read through the post here: www.mgexp.com/forum/mga-forum.2/sucarbs-com-review.2488112/ They recommend a business that restores carbs called www.britishsuperior.com/

@mikemrha9013 3 года назад

Thank you for the quick reply JR, am in Tulsa & have limited resources to work on the car's engine, the fellow helping me is great enough to tell me what he can & cannot do. Do you think the rear carb needs rebuilding our an adjustment to the shaft?

@JRsGarage 3 года назад

Sorry I couldn't tell you that. I'd trust the mechanic more than me talking about something I don't know from not seeing it. Have you checked the distributor and coil That's the only other thing I could think of to cause that problem.

@mikemrha9013 3 года назад

@@JRsGarage Thanks again, I passed along your suggestion!

@chormy 6 лет назад

Good video but for setting carbs you need to separate by undoing clamps and setting individual carbs , then lock shafts again with correct clearance on the forks. lot more fiddling about.

@JRsGarage 6 лет назад

+Shaun Holmes Thanks Shaun, are you talking about the shaft clamps to make sure each moves at the same time? What do you mean by the fork... sorry, you may be talking over my head. I tried to follow the instructions the best I could but skipped some of the "single carb" steps because mine were moving in unison. Perhaps I should not have done so.

@chormy 6 лет назад

Yes , the shaft clamps move inwards to take the pin out of the forks from memory, only need one side off. by setting carbs on there own its stops any influence from other. more often the forks are in sync but if you have stripped them apart best do this part . I feel another 30min video for you. the gap between pin and top of fork has to be xxx inches for both fiddly thing to get right as with everything SU. Well done for your series keep it going.