carb sync

ive got a 1982 kz750 spectre..and I also have a carb sync tool with 4 gauges.. can anyone tell me where to hook it in..I looked around the carbs and there is no plugs but 3 of the 4 have vacume ports for other things..

You have to disconnect the 3 lines from the vacuum ports & remove a vac cap, probably on carb #3.
#2 probably has the vac line for the fuel tank petcock and #1 & #4 probably have the clean air system vac tubing. I guess you should cap the clean air tubing?

Hey bud is the bike running good? or is she acting up on you?

I found the plug over the vacume nipple thing thanks. And the bike is running pretty bad I found it in a barn.

If it was in a barn it will most likely need the carbs gone through and cleaned. If the rack has not been torn apart I doubt they are out of sync. Just my thoughts. good luck keep us posted.

Alredy been through the carbs. Still won't idle. The previous owner for some reason adjust all the pilot screws so I'm just trying to tune it. I have so little time it's taking a long time to get it right

Just an FYI: there probably isn't a factory specified Pilot Screw setting for the US models, but for the Canadian models it's probably 2 turn out from seated (seat them gently - the tips are fragile).
If you need a service manual, search eebbaayy for KZ750 Shaft Manual. There are several listed.

Here's a site w a manual & wiring diagrams for the chain drive models.
The carb info may be helpful, though. mbsween.bike-night KZ750L3 page .....
Scroll down & click "The Bible" link.

Note: not really applicable to your 750-N1, but some of the wiring diagrams are mislabeled in the links.
An H2 is a 1981 model, the H3 is an 82, & the H4 is an 83. (search tags mbsween KZ750L3)