nitroazza Posted July 25, 2011 Share Posted July 25, 2011 Right guys In a confusion here. Basically, as good practice, always record down what the stock needles settings are when an engine is new. I always do this. For my hyper .21 4port, the LSN is 5 and 1/3 Turns out from closed. I have had a few muck arounds with tuning before, setting it back to stock settings and re-tuning, which had been brilliant. the settings recorded, LSN - 5 and 1/3 turns out has always set it perfect, nice and rich, for leaning out... BUT Since ive sealed up the back plate using high temperature gasket sealant, then "stock" needle settings for the LSN have changed. After sealing, i set back to stock settings to give it a fresh tune. and wierdly, 5 and 1/3 turns out is now actually wayyy too lean for it to even start. to get a nice rich setting to start from is now just over 8 turns out from closed. so from 5+ turns to 8+ turns,, just over sealing the back plate. is this normal??? Quote Link to comment Share on other sites More sharing options...
Monkey_Man Posted July 25, 2011 Share Posted July 25, 2011 did you touch the middle speed needle? as this would mean the lsn is further out of the carb body? but then it would still be measured from the closed position so it wouldnt matter where the msn was... Quote Link to comment Share on other sites More sharing options...
nitroazza Posted July 25, 2011 Author Share Posted July 25, 2011 hi mate nope never touched the MSN in my life. and have no need to. Its wierd, because now for it to be nice and rich the LSN needle screw it sticking out miles from flush, when it was normally around the flush area. Quote Link to comment Share on other sites More sharing options...
badger906 Posted July 25, 2011 Share Posted July 25, 2011 factory settings will always remain the same. from the sounds of it there's an air leak, which is sucking in more air than it would normally get when at factory settings, so the only cure is to richen it further. 1 Quote Link to comment Share on other sites More sharing options...
nitroazza Posted July 25, 2011 Author Share Posted July 25, 2011 factory settings will always remain the same. from the sounds of it there's an air leak, which is sucking in more air than it would normally get when at factory settings, so the only cure is to richen it further. hmm, thats what i thought? But surely after sealing the backplate and that with high temperature silicone sealant, that would have stopped the air leak???? Quote Link to comment Share on other sites More sharing options...
badger906 Posted July 25, 2011 Share Posted July 25, 2011 maybe its leaking from somewhere else/its become worse Quote Link to comment Share on other sites More sharing options...
nitroazza Posted July 26, 2011 Author Share Posted July 26, 2011 but wierdly, my HSN is fine. Thats still 3 and half turns out, and runs it nice and rich. its just my LSN rich position has changed. Quote Link to comment Share on other sites More sharing options...
nitroazza Posted July 27, 2011 Author Share Posted July 27, 2011 right, did an air leak test using soapy water. An air leak was found to be around the bolt that locks the carb in place. is this common? Quote Link to comment Share on other sites More sharing options...
badger906 Posted July 27, 2011 Share Posted July 27, 2011 nope seal it good! also check the front bearing. Quote Link to comment Share on other sites More sharing options...
doug_smuggler Posted July 27, 2011 Share Posted July 27, 2011 yes mine was doing it other day took it out put it back and stopped but the car seems to wont to rev on its own now and driving me mad a have tried lots of things and still wont stop but my clutch is dead as well so ordered a new one and seeing if that helps Quote Link to comment Share on other sites More sharing options...
nitroazza Posted July 27, 2011 Author Share Posted July 27, 2011 nope seal it good! also check the front bearing. ive fixed it mate. it was around the carb pinch bolt and LSN seal, so i replaced the seal, and sealed the carb, sorted Quote Link to comment Share on other sites More sharing options...
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