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TOPIC: 1982 750 L2 - carb frustrations (leak and choke)

1982 750 L2 - carb frustrations (leak and choke) 29 Apr 2020 21:11 #824601

  • bigkuri
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Getting my 20-year-not-started 1982 750 L2 working was going great... until the carb. It is the Keihin setup. The PO drained the float bowls prior to storage (i.e., throwing a tarp over it), but the carb has been more hassle than I thought. Two main issues:

- The T-junction of the fuel intake leaks. The original 0-rings were hard as nails, so I replaced with 5x2mm I had, however it still leaks. Assuming that it is the o-ring size, I've read on here that it needs 5.5x2mm, so that extra 0.5mm ID must make all the difference? Is 5.5x2mm correct? ID or OD for the measurement?

- When reassembly of the carbs together, it seems so hit and miss getting the choke butterflies to freely move when tight. Is that just the way of it - they are hit and miss; sometimes I carefully tighten up the 4x carbs to the brackets it is fine, sometimes it binds the choke. Any trick to it?

Once this is sorted then after new chain/sprockets (530 conversion ordered) it should be a runner....
1982 Z750 L2

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1982 750 L2 - carb frustrations (leak and choke) 30 Apr 2020 05:08 #824606

  • Nessism
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5.5 x 2.0 is the correct size O-rings for both the Tee and the fuel transfer tubes.

Try moving the choke discs around with the screws just lightly snugged until they snap shut easily. Also, keep the main carb to joining bracket screws loose too. You gotta play with the position of everything and then slowly tighten the screws to make sure the chokes rods don't bind. It's fiddly at first then you will get the hang of it.
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1982 750 L2 - carb frustrations (leak and choke) 30 Apr 2020 14:03 #824658

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Wonderful :) Thank you @Nessism

I hoped as much, just checking I was not missing some simple technique.

I had better go hunt down some right-sized o-rings! A hard size to find....

Thanks!
1982 Z750 L2

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1982 750 L2 - carb frustrations (leak and choke) 05 May 2020 20:05 #825087

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Just for the record for anyone searching for these o-rings like me.... I tried some 5x2mm that I had in a metric o-ring set, and they still leak. I then found a supplier who does 5.6x2.4mm but they are to big to fit without a LOT of force. So my search goes on for 5.5x2mm....
1982 Z750 L2

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1982 750 L2 - carb frustrations (leak and choke) 05 May 2020 20:33 #825088

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www.theoringstore.com/store/index.php?ma...11&products_id=27539

I can help if you are in the USA if you don't feel like ordering in bulk. It might be a good time to get all the sizes through the O-ring store though.

Pilot Screw: 1.2 x 2.6
Pilot Plug: 1.5 x 2.8
Fuel Transfer Tubes: 2.0 x 5.5
Drain Screws: 1.4 x 4.0
Float Bowl: 2.0 x 67

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Last edit: by Nessism.

1982 750 L2 - carb frustrations (leak and choke) 05 May 2020 21:40 #825090

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Ah, yes as soon as I wrote that I realized that I should have mentioned that I am in NZ!! :)

Special little items like this are just terrible to find here. With my XR650R every time I need a part the answer is "special item from Japan, wait 6 weeks".

The ORing Store has them all, just not keen on the $30+ delivery to NZ for about $1 of o-rings! I'll find them sooner or later down under - many of our special engineering companies will have them, but they don't have an online presence and are still in limp mode with COVID restrictions.

Thanks for all the sizes Nessism!!
1982 Z750 L2

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1982 750 L2 - carb frustrations (leak and choke) 06 May 2020 21:44 #825161

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The O-Ring Store is great. I finally just swallowed the postage, and for about 6 bucks got a complete o-ring set. Just never mind the $30 postage! lol
1982 Z750 L2

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1982 750 L2 - carb frustrations (leak and choke) 23 May 2020 01:21 #826372

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O-rings arrived from the USA, however the Tee is still leaking. I bought a new fuel hose and clamp just to make sure that it's not leading from the inlet of the T, but there is so much fuel coming out it is hard to tell if it is the o-rings or something else.

I found a post from three years ago referencing making a replacement: kzrider.com/forum/3-carburetor/605636-ke...v34-float-bowl-leaks

That is unfortunately beyond the workshop I have, but mainly the skill. Are there other common bikes using the carbs, or parts that I could use instead like the tee from the Mikuni carbs which has two o-rings on each side?
1982 Z750 L2

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1982 750 L2 - carb frustrations (leak and choke) 23 May 2020 06:12 #826378

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This Tee seems correct for the 750...

Shipping to NZ seem to be about $20.

I can make one for you but it won't be cheaper than that.

Good luck
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1982 750 L2 - carb frustrations (leak and choke) 23 May 2020 13:52 #826404

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Thanks so much, yet again!

My knowledge of these air cooled Kawas is slowly building. My background is single pot dirt bikes (where I have usually fitted Lectron) and large FI KTMs, so this is a good learning curve of carbs!
1982 Z750 L2

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1982 750 L2 - carb frustrations (leak and choke) 24 May 2020 00:26 #826425

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Ordered it, so now another 2-3 week wait till arrival, then hopefully some success!
:)
1982 Z750 L2

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