Laurie, Thank you. I only detected the hole while pointing the diaphragm at the sun, as you say.
Best regards Jarek On Sun, 17 Nov 2019 at 10:05, Laurie Hoffman via dog < [email protected]> wrote: > An interesting thing that that I've learned from our engineers (Rob and > Col) is that diaphragm holes can be quite fine and quite concealed. > > The need is to hold the diaphragm up to a good light eg sunshine while > VERY GENTLY stretching it out section by section. The offset is that with > older diaphragms the act of stretching them may induce some cracks. > > Remember to locate the diaphragm lug into the detente position of the > carby body when reinstalling! > > 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 Sun., 17 Nov. 2019 at 7:12 pm, Rob Thompson > <[email protected]> wrote: > Hi Jarek, > The vacuum from the engine holds the piston up when you apply power. > If there is a hole, the piston will sit lower or if the hole is big enough > won't lift at all! > Either way you will get a restricted fuel/air flow to those two cylinders > and they will be out of balance with the other side. > A small hole = rough running. A big hole = very rough running. > > regards > Rob > > Rob Thompson > 0429 493 828 > > > > On Sun, Nov 17, 2019 at 6:56 PM Jarek Steliga <[email protected]> > wrote: > > Greg, > > Thank you. This means that I was wrong in squarely blaming a tiny little > (barely visible) hole which I detected for the engine at times not being > able to rev up beyond 2000 RMP. I simply thought the diaphragm kept the > piston up for as long as the revs were higher and stayed there. My > detective work is back to square one. > > > Regards > Jarek > > > > On Sat, 16 Nov 2019 at 22:49, Greg Wilson <[email protected]> wrote: > > The diaphragm helps lifts the needle when you accelerate. Failed or porous > diaphragm will cause a lull in acceleration. I.e. If you slowly increase > the throttle very slowly you should still get full revs. > > Ditto if you don’t lubricate the centre tube, which can cause the carby > cylinder to bind when it’s lifting. > > My understanding anyway. > > > > > Greg Wilson > > > > > ---- On Sun, 17 Nov 2019 06:02:55 +1100 Jarek Steliga< > [email protected]> wrote ---- > > > > Hello, > > In case some of you had this problem, what were the symptoms? > > Thank you in anticipation > > Regards > Jarek > > > >
