Wools240 Posted March 1, 2015 Share Posted March 1, 2015 Hey guys i'm looking for some advice on my carbs. The carbs came with the car,but are not in running condition. I'm trying to decide if I should rebuild these round tops myself or send them off to have someone who know these carbs do the work. I live in the Chicago area but haven't found any shops around here. I've looked at Paltech in Ohio and Ztherapy. They seem like they would be pretty easy to do myself. Hope this is the right place to ask these questions. thanks Quote Link to comment Share on other sites More sharing options...
Miles Posted March 1, 2015 Share Posted March 1, 2015 (edited) If you are new to SU carbs then you need to buy the "Just SUs" video at http://www.ztherapy.com/ After viewing this video you will be able to maintain, adjust and repair SU carbs. Ztherapy also carries parts for SU carbs. If you Google SU carb adjustment or SU repair you should get many how to work with SUs write ups by Z car owners. Also, search Hybridz and classiczcars.com as there are many posts on maintaining SU carbs. In addition to the video, download a pdf copy of the factory service manual (FSM) for your year Z from the Links forum. Look here too: http://atlanticz.ca/zclub/techtips/carbs/su/index.htm Edited March 1, 2015 by Miles Quote Link to comment Share on other sites More sharing options...
jasper Posted March 1, 2015 Share Posted March 1, 2015 If the throttle shafts/bushings are worn, game over. Have them repaired, and or rebuilt by the pros you mentioned. Quote Link to comment Share on other sites More sharing options...
Miles Posted March 1, 2015 Share Posted March 1, 2015 If the throttle shafts/bushings are worn, game over. Have them repaired, and or rebuilt by the pros you mentioned. Forgot to mention that. If the bushings are worn air will be sucked in around the throttle shaft creating a lean condition and make it impossible to properly adjust the mixture. Typical symptoms of leaking shaft bushings include rough idle, lean sag and backfiring through the carb. If the bushings are suspect you can spray carb cleaner etc. on the throttle shaft ends with the engine running and listen for the engine speeding up or smoothing out. Ztherapy fixed this problem by replacing the throttle shaft bushings with sealed bearings. Quote Link to comment Share on other sites More sharing options...
Wools240 Posted March 1, 2015 Author Share Posted March 1, 2015 I've heard great things about ztherapy. Have any of you had experience with paltech? Quote Link to comment Share on other sites More sharing options...
Miles Posted March 1, 2015 Share Posted March 1, 2015 (edited) Not with paltech. But I bought a set of SU carbs from Ztherapy when I discovered that the throttle shaft bushings were leaking. At that time (2004) a set of Ztherapy carbs ran about $600. If the throttle shafts had been air tight I would have just bought the Ztherapy rebuild kit. I see Paltech rebuilds SUs: http://www.paltech1.com/id4.html Edited March 1, 2015 by Miles Quote Link to comment Share on other sites More sharing options...
Wools240 Posted March 1, 2015 Author Share Posted March 1, 2015 Thanks for the info. It's great to be able to talk with people with Z knowledge. Can't wait to get the car on the road. Quote Link to comment Share on other sites More sharing options...
Darrel Posted March 2, 2015 Share Posted March 2, 2015 Looks like Paltech rebuilds them but use oem nissan throttle bushings. Ztherapy is ahead of the game with the sealed bearings. 1 Quote Link to comment Share on other sites More sharing options...
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