TOPIC:

swest wrote:

They used #6 bolts drilled but I think copper would be better.

I'm not sure I want to drill into my carbs that make a me a bit nervous. If I ever wanted to sell them or trade them for some 29-31s someone else may not want them in there.

So you can put a Allen set screw in there. I was thinking about some KZ 750 twin boots with the ports in them? I don't remember if they have them or not. I think I'l play around with some old boots to see if I can drill and tap into them. That would be ideal. I'm stuck with what I got.
Steve

The earliest Z1s had the vacuum ports on the bottom of the head, there is a boss there still on the later heads if I'm not mistaken. Just below the intake ports

No nothing there. I do remember some Honda's had port screws on the side of the intakes. That might be a option.

I think I found a proper resolution to the vacuum port issue on my 33mm CR Specials. Sudco sells interchangeable spigots and Dime City Cycles sells 5mm threaded brass vacuum ports. Z1 sells J model carb holders that are 34mm Carb bore size,40mm carb spigot diameter, 25mm depth. The CRS spigots I am looking at are 33mm I.D. carb side, 46mm total length and 32.5mm I.D,. carb holder side. Taking into account the threaded length on existing spigots of 14mm and the carb holder depth of 25mm leaves me 7mm of exposed spigot to drill and tap without carb boot interference. Of course I will do a write up on how it all goes. I have included some reference material below for anyone looking to do the same thing.
5mm brass threaded vacuum ports
CR Special mounting adapters (Spigots) pg1
CR Special mounting adapters (Spigots) pg2
Carb Holders (4) KZ1000/1100 34 rubber

I like the first one and the carb boots are a great deal. I think I paid $40+ for each at Kawasaki.
Steve

It's a little chilly in the garage this week and since I live in AZ I don't have a heater or a stove in there, so I did some inside work today.

Good news on my used 1075 cylinder, machine shop got most of the scratch out and he said it was so small and so close to the top that it would not compromise compression or cause oil burning. Cylinder walls are straight and cylinder to piston clearance is on the tight side of service limits. I got really lucky considering everything was used.
Also got my new carb spigots and intake boots. Took a picture of the short ones that were on the caebs when i got them. I have plenty of room to drill and tap for vacuum ports.
I am thinking of porting the head just a bit so I can get a smooth transition. I just want to take that little bit of material out and blend it in a bit. I'm not talking a full port and polish.
As always comments are welcomed.

Glad to hear about your cylinder. So that's what you meant by spigot. Drill into them. I opened my intakes so there wouldn't be a step and cause a vortex to interrupt air/fuel flow. I just wish I could have built up around the outside for more mating surface. Not even 1/4 inch to seal. Just had a vacuum leak there and did what I tell everyone not to do. I used Permatex to seal them. It worked.
Steve

swest wrote: Glad to hear about your cylinder. So that's what you meant by spigot. Drill into them. I opened my intakes so there wouldn't be a step and cause a vortex to interrupt air/fuel flow. I just wish I could have built up around the outside for more mating surface. Not even 1/4 inch to seal. Just had a vacuum leak there and did what I tell everyone not to do. I used Permatex to seal them. It worked.
Steve

How far in did you go to blend it? I was thinking a 1/2"-3/4" should do it.

Thought I would post a sneak peek. Its just a rough in so I could get some measurements for my custom air intake.



Hope you guys like it, still need to clean the carbs up a bit.

kaw-a-holic wrote:

swest wrote: Glad to hear about your cylinder. So that's what you meant by spigot. Drill into them. I opened my intakes so there wouldn't be a step and cause a vortex to interrupt air/fuel flow. I just wish I could have built up around the outside for more mating surface. Not even 1/4 inch to seal. Just had a vacuum leak there and did what I tell everyone not to do. I used Permatex to seal them. It worked.
Steve

How far in did you go to blend it? I was thinking a 1/2"-3/4" should do it.

I only went in 1/4 inch. Didn't know if I would keep them. I wouldn't hog out too much.
Steve

kaw-a-holic wrote: Thought I would post a sneak peek. Its just a rough in so I could get some measurements for my custom air intake.

Hope you guys like it, still need to clean the carbs up a bit.

Air box?