Ric, Now I get what you meant I think. I am myself a 'live well alone' type of person. Thing is that my Limbach doesn't seem to run as smoothly as it might have. I recently noticed one cylinder becoming considerably hotter than the others and its plug being black and sooty. Therefore I am trying to identify the cause. The meetering needle is just one item on the suspect list, but I am beginning to understand (also from your comments) that this detail belongs to fine tuning the engine rather than just having it work decently. I believe I should focus my snoop on the spark plug cables (the spark plugs themselves being brand new and professionally rechecked), then on the magneto. I also take note of the diaphragm holes being a common culprit. Thank you very much for throwing new light on things.
Regards Jarek On Wed, 3 Apr 2019 at 22:44, Laurie Hoffman via dog < [email protected]> wrote: > Hi Ric, > Your comments on the needle adjustment reminded me that over the years we > have had to adjust them quite a few times. Mainly seasonally. > > Rob does an excellent job of maintaining the carbs and motor around those > key factors you listed and worn butterfly spindles and perforated > diaphragms come to mind, especially the latter. > > For any touring its wise to have a spare set in the 'fly away' kit as from > our experience diaphragms are the most common part to fail. When checking > for perforations by holding up to sunlight be very careful not to stretch > them much as you may well do more harm than good! > > And...make sure that the locating lug on the diaphragm goes into its > correct position on the carby body! > > Our Air Experience flights usually involve a climb to between 6000 and > 7500'. Seasonally, we can notice poor running and loss of power as we > approach these levels due to over rich running as confirmed by exhaust and > plug colour. > > As Rob mentioned, usually 1/4-1/2 turn does the trick. > Laurie > Sent from Yahoo7 Mail on Android > <https://go.onelink.me/107872968?pid=InProduct&c=Global_Internal_YGrowth_AndroidEmailSig__AndroidUsers&af_wl=ym&af_sub1=Internal&af_sub2=Global_YGrowth&af_sub3=EmailSignature> > > On Thu, 4 Apr 2019 at 12:43 am, Ric Sutton > <[email protected]> wrote: > > Hi Jarek > > While i do have some mechanical qualifications, please remember that what > i say should by no means be taken as a rule or the final word. i am just as > fallible as the next person. > > i am always happy to hear about information like you have presented here > because in most cases it adds to my body of knowledge. > > Even if i find information of a dubious nature it may help me understand > how or why people do things. > > If you get the impression that altering the main jet(needle) adjustment > will improve the way your machine runs then absolutely get stuck into it > and tell us what you found. Particularly if it means a few more horses to > yank our birds aloft on a hot summers day. > > > > While mine sounds as sweet as a steel box full of chooks, wild cats, jack > hammers and several crates of empty beer bottles rolling down a mountain, > i probably aint gunna mess with it till something changes. (kidding- it > runs a little better than that- replace “wild cats” with “highly excitable > domestic cats”). > > > > Though, if it does change i would look for other causes like diaphragm > holes, worn butterfly spindles, needle and seat not doing their job, > blocked fuel/air filters, loose manifold/carb mounting bolts blah blah blah > etc etc. > > i guess things wear and change but hopefully not too much. > > > > Out of interest, how often were you thinking of doing this? > > > > Fair weather > > ric > > > > *From:* [email protected] [mailto:[email protected]] *On > Behalf Of *Jarek Steliga > *Sent:* Tuesday, 2 April 2019 2:53 AM > *To:* [email protected] > *Subject:* Re: [DOG mailing list] Zenith 150 C3 meetering needle > adjustment > > > > Rob, Ric, > > > > Thank you. I am going to follow your advice shortly. > > > > Ric, > > > > Your question 'why I want to do this' baffled me. I watched the attached > video, I read some sections in the Zenith user's manual and inferred that > the adjustment is a must. > > Do you think it's redundant or excessive? As for the vacuum gauges, I > procured them even before reading your comments here and yes I will be very > mindful of the man mincer :-). > > > > Best regards to both of you > > > > Jarek > > > > > > > > On Mon, 1 Apr 2019 at 15:52, Ric Sutton <[email protected]> wrote: > > Hi Jarek > > For my two cents, i guess my question would be why you want to do this. > But onwards and further to robs comments i check my throttle opening with > vacuum gauges plugged into the balance pipe ports on the intake manifold. > Yes the engine needs to be running but i sit in the cockpit- much safer > than standing next to that spinning man mincer. The vacuum needs to be the > same at idle and at wide open throttle and by the same i mean having > identical readings between carbs not identical readings at idle and at full > throttle...... eh you know what i mean. > > Good luck > > ric > > > > *From:* [email protected] [mailto:[email protected]] *On > Behalf Of *Jarek Steliga > *Sent:* Monday, 1 April 2019 4:18 AM > *To:* [email protected] > *Subject:* [DOG mailing list] Zenith 150 C3 meetering needle adjustment > > > > > > > > Hello everyone, > > > > I watched this video https://www.youtube.com/watch?v=wenBlytGjSI but is > it of any use in the case of TWO carburators as is on my Limbach 2000? Is > the meetering needle adjustment at all possible in this case? How should I > go about it? > > > > > > Thank you in anticipation > > > > Regards > > Jarek > > > > > >
