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I am extremely pleased and relieved to report that 137 has now had a maiden voyage up the drive, along the road and round the garden. Changing the mag to a later impulse Wico transformed it, started and ran second pull. Not without a glitch though reversed out of the garage 10 yards and it stopped , I thought here we go again, took the plug out expecting it to be fouled no it was fine, changed it anyway to a two terminal 18mm plug, set it up went to tickle the carb and it did not tickle, took the fuel cap off NO PETROL I have used a whole tank full ( 2 gallons ) just trying to get it started over the last ten days. Full tank of fuel and it started first time. I have refitted the air pipe and then the filter in stages to check for any change in running, no apparent effect so it looks as if Cinderella will go to the ball in malvern. I am annoyed with myself for persisting so long with the two original magnetos. I justify it in that I have tried so hard to restore it to as it would have been when it left the factory, I have rebuilt so many bits of scrap to as new rather than replace but there comes a point when common sense and my physical well being prevail over total originality. I will have the mags rebuilt when I can find someone who knows what they are doing. I have blisters on my right hand and muscles I never knew I had. But now it all seems worthwhile.
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Nice new air filter arrived today courtesy of a chap called Chris Pamplin an expert on Vokes filters, he had two made for me. I have fitted one but not run engine yet, yesterday the mixture was good at speed but rich on tickover so may risk fitting a smaller slow running jet especially as the filter will richen things up slightly. Finally fitted the second floorboard. The fan belt was annoying me and very difficult to tension so fitted a new one a bit smaller, it meant completely unbolting the engine and sliding it forwards but gave me chance to clean up the flywheel etc which were covered in grease and oil from bedding in the starter mechanism. The canopy has suffered a bit with the efforts at getting the engine started so have pulled it off to clean and repair the damage.Hope to give the engine another test run later today and then start a new project.
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Thanks to a lot of support I have finally tracked down the fault with 137, I removed the magneto and bench tested it with a drill and rubber hose drive, poor spark. Removed the points assembly from the Lucas mag. which is a total rotating assembly within a static cam ring. The points were clean and good but then I noticed that where the main point spring is anchored the rebuilder had added a small piece of spring that curved very close too if not touching the insulated points post. Took it out and refitted the points, the whole spring was touching the post hence why the extra bit was added refitted the extra bit turned over so the curvature was the other way and tested mag again, brilliant spark. Refitted the mag good spark but still not running continuously two bangs and then stop opened the throttle a fraction and it started, quickly connected a timing light strobe and found that on the advanced run setting on the manual lever the timing was 36 degrees advance when it should be 20 stopped the engine retarded the ignition and tried again 25 degrees advance stopped and re set again just by rotating the flywheel rather than looking what was going on with the points, started it again measured the timing in the run setting, 20 degrees RESULT. Engine runs sweet at 450 rpm any faster and it is lumpy any slower the same. Using a compressed air gun I squirted air down the inlet and the engine ran smooth and then died back, slowed the engine down and tried the same , same effect. Current diagnosis is that the jets in the carb are too big introducing a rich mixture. That is my fault because the original jets fitted to the carb were much smaller than the 100 main jet and 25 slow running jet that are normally fitted to an MG2. I thought that maybe the car originated from a 400 cc lawnmower engine so fitted standard TB engine MG2 jets. My task in the morning is to refit the original jets and see what happens. At least I am ( i think ) in a position now where there is one fuel related issue rather than a combination of fuel ignition and buggeration factor.! I have added a couple of photos showing the extra spring piece between the screw head at 6 o’clock and the spring anchor at 7 o’clock.
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