 Is anyone using a hex bar linkage, twin carbs |
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| 930cabman |
 Jun 1 2022, 05:37 PM
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Advanced Member  Group: Members Posts: 3,545 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States 
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A decent 1975 Palma Green came to me last year, from Cali with very little rust and original paint. She was running ok with a single carb. I changed it out to a set of twin 40 IDF Webers and she has not run decent since. The cheapskate in me has considered simply sending Tangerine $400. and getting it right, but ...
I can get a smooth idle at 5 -6 on a snail, but increasing the throttle opening a small amount I cannot get equal air readings from 1-2 to 3-4. Compression ranges from 110 to 125, leakdown ranges from 5%-18%, valve clearances at .006. The characteristic popping and poor running are the result of this unbalance condition. thanks in advance |
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| Robarabian |
Jun 1 2022, 06:29 PM
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914 A Roo Group: Members Posts: 622 Joined: 11-February 19 From: Simi Valley, Kalifornia Member No.: 22,865 Region Association: Southern California
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Hi Cabman,
The popping and poor running is likely due to lean condition. Popping for sure. Once you have timing, ignition and valves all proper, then you can tune the carbs. Get them dialed in low and work your way up. There is alot of info on dual carb tuning here and elsewhere. Make sure they are on the idle circuit and the butterflies are closed. Go from there. Do it without any linkage on the carbs. Then attach linkage and sync the linkage. Then work the carbs.. Again, lots of reading to do, but it isnt just being unbalanced... QUOTE(930cabman @ Jun 1 2022, 04:37 PM)  A decent 1975 Palma Green came to me last year, from Cali with very little rust and original paint. She was running ok with a single carb. I changed it out to a set of twin 40 IDF Webers and she has not run decent since. The cheapskate in me has considered simply sending Tangerine $400. and getting it right, but ... I can get a smooth idle at 5 -6 on a snail, but increasing the throttle opening a small amount I cannot get equal air readings from 1-2 to 3-4. Compression ranges from 110 to 125, leakdown ranges from 5%-18%, valve clearances at .006. The characteristic popping and poor running are the result of this unbalance condition. thanks in advance |
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Posts in this topic
930cabman Is anyone using a hex bar linkage Jun 1 2022, 05:37 PM
r_towle After trying all the x bar linkage..and I know how... Jun 1 2022, 07:48 PM
930cabman
After trying all the x bar linkage..and I know ho... Jun 2 2022, 05:38 PM bbrock No question the Tangerine linkage is the best, but... Jun 1 2022, 07:54 PM 914werke :agree: Ive been using a CSP on anything Im ... Jun 1 2022, 08:17 PM 930cabman Thanks for the replies. Spark timing is good, idle... Jun 2 2022, 04:58 AM Superhawk996
Thanks for the replies. Spark timing is good, idl... Jun 2 2022, 11:56 AM |
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