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| centering carby needle https://www.ausmini.com/forums/viewtopic.php?f=2&t=66625 |
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| Author: | blondini [ Sat Oct 30, 2010 7:38 pm ] |
| Post subject: | centering carby needle |
Hi all Just rebuilt a 1&1/2 inch SU carby with a new jet, but the piston is sticking. If I loosen the jet lock nut and give the jet a bit of a wiggle piston moves freely, so i'm guessing the needle is sticking in the jet. What is the best way to line it up? |
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| Author: | drmini in aust [ Sat Oct 30, 2010 8:06 pm ] |
| Post subject: | |
Screw the jet adjusting nut right up to raise jet. Loosen the jet locking nut. Undo the jet screw in the piston, drop the jet about 2mm so the shoulder is below the piston. Refit piston. Tighten the jet locking nut. Push needle back into piston and tighten screw. Adjust mixture as required. 
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| Author: | gafmo [ Sun Oct 31, 2010 12:14 am ] |
| Post subject: | |
http://www.youtube.com/watch?v=sxVFCY_1 ... re=channel |
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| Author: | simon k [ Sun Oct 31, 2010 1:24 am ] |
| Post subject: | |
gafmo wrote: http://www.youtube.com/watch?v=sxVFCY_1aSA&feature=channel
few extra bits in that H type! |
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| Author: | TheMiniMan [ Sun Oct 31, 2010 9:12 am ] |
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i take the jet adjusting nut "spring" out,,, then slip it all back together , loosen the jet sleave lock nut & then with the top of the jet set level with the bridge of the carb, i lift & drop & lift & drop & lift & drop,,, gently trying to center & tighten the jet sleave it often takes a few goes but once it`s done & you have the piston liting & falling sweet,,, then with the sleave lock nut tight you can slip the jet back out & re-fit the jet adjusting nut "spring" yeah it`s a fiddly proceedure but "usually" has to be done after a jet change |
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| Author: | blondini [ Sun Oct 31, 2010 8:03 pm ] |
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Thanks for that played around with it today and piston now going up and down okay - so jet/needle must be centred okay. What's a good start up position for the jet? I think I read somewhere on here to wind it right up then back it off 20 flats of the adjuster nut. |
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| Author: | drmini in aust [ Sun Oct 31, 2010 8:20 pm ] |
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20 seems a lot, I think 12 is more like it... |
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| Author: | TheMiniMan [ Sun Oct 31, 2010 9:28 pm ] |
| Post subject: | |
yeah 2 full turns down from flush with the bridge that`s 12 flats down |
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