Datonedatsun Posted April 28, 2020 Author Share #13 Posted April 28, 2020 Looks kinda ghetto didnt put heat shield back on so I couldnt pin the springs down so I just wrapped one around to pin them back... Link to comment https://www.classiczcars.com/topic/63922-new-carbs-4000-rpm-start/?page=2#findComment-598201 Share on other sites More sharing options...
Zed Head Posted April 28, 2020 Share #14 Posted April 28, 2020 You'd be surprised at how much air can get through that small gap around your throttle valve. I think you need to adjust those so that they're fully closed. Link to comment https://www.classiczcars.com/topic/63922-new-carbs-4000-rpm-start/?page=2#findComment-598203 Share on other sites More sharing options...
Datonedatsun Posted April 28, 2020 Author Share #15 Posted April 28, 2020 Alright I'll do that tomorrow after work and post back the result if it fixes the problem ? thank you Link to comment https://www.classiczcars.com/topic/63922-new-carbs-4000-rpm-start/?page=2#findComment-598205 Share on other sites More sharing options...
7tooZ Posted April 28, 2020 Share #16 Posted April 28, 2020 That choke cable doesn’t look right here’s mine like right7 Is your nozzle all the way up Link to comment https://www.classiczcars.com/topic/63922-new-carbs-4000-rpm-start/?page=2#findComment-598206 Share on other sites More sharing options...
7tooZ Posted April 28, 2020 Share #17 Posted April 28, 2020 (edited) 15 minutes ago, Zed Head said: You'd be surprised at how much air can get through that small gap around your throttle valve. I think you need to adjust those so that they're fully closed. Is that butterfly gap about what the full choke position opens them to? doesnt full choke drop the nozzle and open the butterfly? Edited April 28, 2020 by 7tooZ Added thought Link to comment https://www.classiczcars.com/topic/63922-new-carbs-4000-rpm-start/?page=2#findComment-598208 Share on other sites More sharing options...
Datonedatsun Posted April 28, 2020 Author Share #18 Posted April 28, 2020 Nozzles are all the way up Link to comment https://www.classiczcars.com/topic/63922-new-carbs-4000-rpm-start/?page=2#findComment-598211 Share on other sites More sharing options...
7tooZ Posted April 28, 2020 Share #19 Posted April 28, 2020 Did you disconnect the choke cable? Link to comment https://www.classiczcars.com/topic/63922-new-carbs-4000-rpm-start/?page=2#findComment-598212 Share on other sites More sharing options...
Datonedatsun Posted April 28, 2020 Author Share #20 Posted April 28, 2020 No sir but originally I didnt have the choke wires hooked up and it still did it before Link to comment https://www.classiczcars.com/topic/63922-new-carbs-4000-rpm-start/?page=2#findComment-598213 Share on other sites More sharing options...
Captain Obvious Posted April 28, 2020 Share #21 Posted April 28, 2020 I can't make out both butterflies, but the one I CAN see is not what I would call "closed". Different cars need different amounts, but IMHO, that's open much further than idle. And some other weirdness, although I'm not sure it's related: 1) It looks like you're using 72 spacer blocks between the carbs and the intake manifolds, and they are upside down. I'm not sure that's causing you a vacuum leak or what, but if you're sucking air in there and then opening the butterflies to "compensate" maybe? 2) The linkage between the two carbs looks a little too short. Looks like the ball on the left side in the pic (front carb) is close to falling out of the receiving hole on the carb. I'm not sure what all the years parts you're working with here, but that's a problem that often occurs when there are 73 or 74 parts involved. I don't think you've got that, so I can't explain the issue there. Link to comment https://www.classiczcars.com/topic/63922-new-carbs-4000-rpm-start/?page=2#findComment-598225 Share on other sites More sharing options...
Datonedatsun Posted April 29, 2020 Author Share #22 Posted April 29, 2020 Sorry late reply, gonna go pull them off and adjust the butterfly and flip the spacer blocks I'll post some before pics of the carbs before I took them off Link to comment https://www.classiczcars.com/topic/63922-new-carbs-4000-rpm-start/?page=2#findComment-598365 Share on other sites More sharing options...
Datonedatsun Posted April 29, 2020 Author Share #23 Posted April 29, 2020 Sorry late reply, gonna go pull them off and adjust the butterfly and flip the spacer blocks I'll post some before pics of the carbs before I took them off Link to comment https://www.classiczcars.com/topic/63922-new-carbs-4000-rpm-start/?page=2#findComment-598367 Share on other sites More sharing options...
240260280 Posted April 29, 2020 Share #24 Posted April 29, 2020 Do you hear air at this port? Link to comment https://www.classiczcars.com/topic/63922-new-carbs-4000-rpm-start/?page=2#findComment-598370 Share on other sites More sharing options...
motorman7
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