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Hi Matt, In normal dry air the spark gap that a normal ignition system will jump is at least 5mm, that is why we bare the end of a lead and check. This is a standard check. The voltage required to jump a gap inside an engine, indeed any space where air is compressed increases with compression ratio...

Matt, Let's get ignition sorted first. Ming is spot on there, the generator winding resistance absolute value is of little help if you don't know what it's manufactured value was. If you have had it professionally rewound then they would have given you a test report with the resistance value quoted...

Source coil resistance is only an approximate indication of the state of the coil, as said many times on other posts. If it is still the original winding its a definite suspect. Also the measurement is carried out with the coil disconnected and not kicked over. Hi Ming- thanks for you reply- I was ...

Hi All I have discovered I definitely have a weak/intermitent spark on rear cylinder. I've checked all wires to the related transducer and found nothing wrong- good earth, good connections on the green and red wires (both ends) good copper HT leads clipped and re attached to be sure. When I do the O...

FWIW I never used a strobe on the ignition on any of my Morinis, just set static timing to the mark. Likewise carbs were tuned (ahem) by ear or wires under the slides. I did change a couple of choke rubber discs. I think your carb problem might turn out to be ignition related. Even a badly set up c...

Hello Matt, I don't know where you get the information that a 79 sport has 98 main jet. That might be the case for USA Emissions spec (California) but these have a sealed airbox and in later versions a different airbox, please don't try it even if it fixes something its just wrong. 79 onwards A and...

Thanks MickyM...currently bike not start on choke...

Hi 3potjohn-not certain chokes seal OK...but... I did buy new chokes last year and when I put them on/use the chokes I can hear a change in sound as if it is sucking through different area of carbs so I think they seal OK when not in use as sounds different. Is there a way to check this?

Many thanks Mark, 3potjohn and Steve. I will stick to 115 main jet- got mixed up with American ties as you say. I think my issue maybe the other carb potential problems you kindly listed and I’ll check them. Was trying a 45 pilot but now 50 at present. Starting difficult from cold or impossible. Usi...

Hi 3potjohn and Steve- thanks for your thoughts. I update you....I re strobed the timing as I had moved it about on the road in desperation. I now have OK advance at 5,000 ish revs ( no rev counter to check that). It needs to be set in retarded position in relation to standard as I am using blue Duc...

Many thanks Steve- I will check float heights, lower needle height (needles not worn I don't think) and re strobe timing as I have moved it without re checking. I will then try no air filters if these adjustments don't improve things. best Matt

Hi All- hope track day goers had a great day+...I have sooty plugs possibly causing stuttering /one cylinder running when engine warm after a mile...starts and runs ok before this...I’m running 43 pilot jet but with 115 main with standard (new) air filters fitted. No splits in rubbers anywhere. Shou...

Many thanks Steve! Very helpful- good to know the Mdina ones will be better!

Hi All Thanks again for all advice on thread "Bogging down/ rough running problem" I think Mark (threadmbmm350s) got it and when I re read his post properly I realised the white wire that I had linking the two ignition boxes needed to be removed- seems to have made a difference...I have be...

I’m very grateful for these replies. I’ve been ‘off’ the bike for 2 months but now spring is anlmost here I’m beginning to get back to it…I’ll have a look at my atomisers. Original ones still in but needle position not in top notch position so will try moving to see what happens. Also I will try the...