Z1000 LTD rough running- help please

[ianz1000ltd]

Hello,
Just to say, I am not that good a mechanic but I am trying to learn, so I may write things here that you may think are draft so please tell me I am grateful of the help.
I got the bike and since I have had it is ale=ways ran rough, lumpy, back fires etc. So I changed the plugs, caps, leads and coils. I have taken the carbs apart and cleaned them, and checked the jets, the float heights, the diagrams and it all looks good. BUt it is still the same. Then I checked the inlet rubbers- all OK. Now this is where I am getting confused- I put the vacuum gauges accross the carbs and turned over the engine and originally I only had a vacuum on No1, nothing on the others. So I assumed that there must be an issue with the carbs 2,3 and 4 not getting a vacuum , a leak or something- is that right?
Anyway so I thought, well No1 was ok, so I will take items off No1 and swop with No4 and see if it makes a difference. I swopped the diagramm, and the bowl, it made no difference at all. In fact nowwhen I turn it over I get no vacuum on anything.
I have ordered a compression tester, but when I block the inlet port off with a rubber glove, it will pop it, so I guess the engine is sucking. It does this on all cylinders. Also when I turn it over I do get compression through the plug holes.
I am completely confused now, and I realy dont know what to do. If anyone has any ideas that I can try I would be really happy. I just want to get it done so I can go out on it.

Thanks for reading,

Ian

[z1bman]

check the compression & make sure there are no pin holes in the diaphragm rubbers ?

[ianz1000ltd]

I am pretty sure the diagramms are ok, because when i push the sliders up and block the air way they stay up intill the pressure is released, but I will check ompression, when the tester arrives- thanks

[Farmer]

Take the carb to engine rubber off of number 4 and check mating face to see if its wet, if it is its leaking, replace all 4.

[ianz1000ltd]

Farmer,
I have taken them off and checked and resealed them, it is still the same.
thanks for your thoughts

[PAULJAC47]

Check out this site look down to where it says syschronise carbs,learnt lots of this site ,very good,have had similar probs with these cv type carbs meself.

Paul J

http://members.dslextreme.com/users/bikecliff/

[Farmer]

What are the o rings like on the plugs where the pilot jets are also o rings on float needle seat ?.

[ianz1000ltd]

I havent checked them, I will look tomorrow. would that cause me the problems do you think?
Are they the bits you get in the carb refurb kits?

thanks for your help.

Ian

[Farmer]

I was told by Andy at NRP carbs that they are always overlooked, he's got them in stock.