Carb throat balance when tuning now a rebuild saga !, those with Zenith carbs can learn from my bad fortune ? |
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Carb throat balance when tuning now a rebuild saga !, those with Zenith carbs can learn from my bad fortune ? |
porschetub |
Aug 29 2023, 11:25 PM
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#1
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Advanced Member Group: Members Posts: 4,706 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
Doing a tune on my Zeniths ,cant find an exact rpm range and done a ton of research ;
Bruce Anderson mentioned 1800 in his book, Factory says 1000 in the gary.suggate site factory manual, Haynes manual tells us 1000. So far I have tuned throats @ idle ,1000rpm ,1400 and 1800 on hand throttle and strangely I get the same balance any way ?. Now thinking its not an issue but would appreciate feedback from 6yl guys with carbs,TIA,cheers |
porschetub |
Dec 6 2023, 09:43 PM
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#2
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Advanced Member Group: Members Posts: 4,706 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
Both carbs back on after checking for delivery with full fuel bowls ,hoping the weather holds and I can put some fuel in and check for leaks under system pressure .
Did some checks on the old fuel and found no water content ,so it is now lawn mower fuel cause the B&S motor not too fussed on octane remaining (IMG:style_emoticons/default/biggrin.gif) ,otherwise I would have been worried where the water came from but have confirmed source as suspected. Prime carbs with pump and no leaks tried to start and only firing on a few plugs , pull the Bosch ones and find 3 dead ,replaced with new NGK's and started first cranks of starter, high idle but found bellcrank rod too short so pull that off for the mean while . Will recheck timing as I screwed with that (IMG:style_emoticons/default/headbang.gif) (IMG:style_emoticons/default/headbang.gif) and balance idle and throats on them tomorrow ,early indications are good @ this stage even with basic timing but no point in going further until that is spot on . Cheers. |
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