Hitachi HMB 46w carb tuning

[Warrrenoh1]

I need some help. I have fiddled with cars for the past 5 years but it has mostly been on newer models, like jeeps and broncos. mostly suspension and body work. i recently bought a 260z. it runs and drives fine but it smells really rich driving down the road. it doesn't bog down or loose power at any rpm. i never really messed with carbs before. i Have a haynes manual and i tried fiddling with the air fuel mixture screws but it didn't really do much. I like to think if i tuned it right i can get some more power out of it. also i wont be choking on fumes. Side note i bought it in colorado and brought it back to new mexico. should i re-jet it? if so it didn't tell me how. Any other sources i can look into for Carb adjustments. (also i do know about the exhaust leak)

[Mark Maras]

 Are the carbs the original flat top Hitachi SU's that came on the 74's or have they been changed to the earlier round tops?

[dutchzcarguy]

Mark...... HMB IS the flattop...  

HMB46W is the flattop.

HJG46W is the roundtop..

I hear over and over those flattops are boatanchors , get yourself a set from ztherapy.  (Roundtops are much easyer to adjust..)  i wonder is there no service set for those boatanchors haha??

[siteunseen]

A quick google search shows youtube videos aplenty.

https://youtu.be/TR_5h-unBbE

[Warrrenoh1]

thank you for the link. i will look more into them this weekend. its all parking lot maintenance lol.