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Had a similar thing with the Honda CX500.
No problem starting if used every day (always closed the taps), but if left a week (or more) would fail to start – unless – drain the carb bowls, then close drain cocks, taps on to refill – started easy.
That’s as maybe Matt, but try retarding the timing just a little. The running backwards (a way of reversing in some single cylinder hot bulb diesel two strokes) is due to the timing being advanced enough to promote sending the piston down the ‘wrong’ way. Back it off a bit and see what happens.
The Swedish Bolinder hot bulb engine (single pot about six litres in capacity, often called semi-diesels) with no reversing gearbox, could achieve reverse by allowing the engine to almost stall, then operating a separate oil lever to fire just before the piston reached it normal (running forward) firing point. This would then fire, and send the piston back down the bore reversing the direction of the propellor. If missed, lots of blue air and a crash!
As Nelson might have said – ‘I see no worms – only interest!’ 😉
Cycle magazine of February 1978 has a five page article on two stroke pre-mixes. I have it as a pdf, but don’t know how to ‘share’ same here. They test 15:1; 20:1; 30:1, and speak of 50:1.
Their ultimate sentence is, quote: –
“Less, in the context of pre-mix lubrication concentration isn’t more; it’s less. Just as logic always insisted.”
I have a family member who ran a Husqvarna 360 chain saw for twenty odd years on forestry work on the most frugal of mixes. He even used used car oil to lube the chain. I had the job of servicing his saw when it died, and found the cage of the main ball bearings disintegrated, the small parts finding their way above the piston where before being ejected through the exhaust port, had hammered the piston top so much that instead of being flat topped, it was dished! New bearings and piston later, it lived to see many more days of work.
Try cleaning those extractor fan ducts – not a happy thought!
BMW’s have a similar problem on the air heads. The solution there is to have the head machined and a bronze insert installed threaded in, and threaded to take the aluminium retaining nut. Maybe worth talking to BMW onwers, or Bob Porecha in Sydenham.
Have a word with Goffy:
I suspect there should be, though you don’t say which model or carb you refer to.
Have a look here:
Should do nicely.
Ah! Say – So you did. Not much help then. I take it the coil is of the appropriate resistance in Ohms.
Rarely had to replace a coil, in fact on bikes – never, though they can fail of course. 2cv coils are oil filled and can leak if cracked, and fail if ignition left on not running.
Have you changed the condenser? Those little devils can give similar symptoms.
Definitely not a common size, at least my 18mm ring spanner seldom gets used. Citroen 2cv’s are quirky like that too, lots of m7 bolts with 11mm across the flats.
The relevance of the illuminated rear light suggests something is either incorrectly connected, or is bleeding current from one place to another. Without hands on using a multi meter to check Voltages and continuity, it’s hard to pin point the fault.
17 – 19 there is a number between those two . . . 😉
Hi Mark, just back from being away a week.
Interesting to read your outer was 9mm too short, and my outer was 9mm too long!! I wonder if their stock has got mixed up!?!? Mine came from Cristine Gradisch trading as http://www.oldtimer-teileshop.de
I bought a set of five cables (both brakes; clutch; throttle and choke) for the ES125. Inc. p&p from Germany £19.10p. It’s possible your throttle cable would have fitted mine perfectly, and visa versa!
Sounds like the cable outer is a bit short, or the inner a bit long (same effect). If any end ferrules are all in place and are fully seated in their respective locations, you might need to add another at some point to compensate for the discrepancy allowing the cable adjuster to work on the tickover, either that or if you are handy with the soldering, shorten the inner – but measure carefully first.
Mark you, I only have had ‘hands on’ with an ES125, and the new cable I got from Germany had an outer 9mm too long, preventing the throttle slide from closing at all! Did it rev!! Shortening the outer cured that one.