CARB DIAPHRAGMs

[radical123]

will the CARB DIAPHRAGMs form the 1979,78 work in the 1980,81 bodeies?

[Toolmaker Tim]

Diaphragms

If you are talking about the entire assembly, the diaphragm and slide body,the answer is no. As for the diaphragm alone, I don't know. Are you trying to rebuild your existing slides or replace the whole assembly?

[crazy steve]

As Tim said, the diaphram/slide won't swap, but you can swap just the diaphram. A bit tricky to get off the old slide and on to the new, but doable...

[Toolmaker Tim]

Diaphragm Swap

Thanks Steve, I was ready to try to see if they were swappable by turning one upside down on a carb body. I guess I could have just laid one on top of a 78/79 slide assembly. By the way, how do you get them apart?

[Rasputin]

[Toolmaker Tim]

Pictures

Well, if pictures are worth a thousand words, there's 8000 words! Thank you Rasputin

[petejw]

heres a link to a method of changing the
rubbers over, if they do swap over works well.

http://www.xs11.com/forum/showthread.php?t=21345

[Rasputin]

it was just easier than trying to explain.

[Toolmaker Tim]

Fortunately I don't need to do a change right know. I have a spare set of 78/79 slide assemblies. I also have a set of 80/81 slides that came with a parts bike. The PO had grafted a 81SH carb into a rack of 78/79 carbs with perdictable results.

[radical123]

good

Thank you for the replply.you guys are grate

[crazy steve]

Actually, I've swapped them without removing the plastic ring or modifying anything. I simply pulled them off (carefully, as not to tear it), then 'stretched' them to reinstall. That's where it gets tricky, but careful working at it can get them back on. Use a little WD40 for lube, it helps...

[Aches n Pains]

How does one tell the difference between 78/79 and 80/81 slides? I have a box with 8 sets and know that there is one set of each.

Thanks

[petejw]

How does one tell the difference between 78/79 and 80/81 slides? I have a box with 8 sets and know that there is one set of each.

Thanks

if u click on the link in my post above, it shows a pic
of the later model slides, its been ages since ive seen the early
model ones and cant remember what they look like.

[crazy steve]

How does one tell the difference between 78/79 and 80/81 slides? I have a box with 8 sets and know that there is one set of each.

Thanks

The '78-79 slides are smaller in diameter than the later slides, but there's other differences too. The '78-79 have a plastic retainer for the needle jet that's held in with a C-clip and an adjustable needle, while the later slides have a non-adjustable needle jet that's covered by a round metal plate held in with two screws. If you see screws, it's the later type.

[James England]

I replaced my four diaphragms easily without having to cut the top off. It's so simple to do that I would recommend doing it in the way described here. I personally don't like the idea of cutting the tops off because it will affect the integrity of the component and the weights of each slide assembly may vary afterwards:

http://cgi.ebay.co.uk/NEW4pcs-CARB-D...item3f0937e5e6


I bought my diaphragms from this US seller and they fitted easily. You definitely need lighter fluid as a lubricant... it's the best stuff for it. My old diaphragms were torn and pin-holed. The new ones made a huge difference to the running of the bike.