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Post by buster on Aug 27, 2022 18:40:47 GMT
precision engineering tools at the ready strip cut and bent decision time and past the point of no return and yes I know its a bit cockeyed but it didnt last long anyway... problem is I forgot about the power of expansion and contraction, it pinged itself off about a mile up the road, oddly the bike still ran ok above 4000rpm but was a complete sack of spanners at lower revs. this suggests to me that magnetic fields are even more complicated than I already thought they were . should have paid more attention to the teacher in physics instead of ogling alison's (the girl sat in fromt of me) legs. plan b, is try and mount the pickup backwards, with some trimming and spacers, to get a better alignment with the pip on the mag wheel. I dont know if any other members have dissected a mag wheel before but best advice is dont, unless its otherwise scrap. the magnets appear to be glued and screwed on. it may be of interest though to know that the pip contains its own individual magnet, no idea which way its orientated and cant be bothered to think about it as its now (in the words of that gobby rawlings bugger) beer o clock
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Post by buster on Aug 28, 2022 16:49:35 GMT
I'm not sure why but I'm failing to get any advance out of the ignitech unit, going to have to email them and see whats what so decided to try the german one (see if I can get any joy out of that one) so made a bracket to take the nx250 pickup (insanely tricky and very difficult to fit on the bike) problem is I spent all afternoon swearing at windows, trying to download software and drivers, its probably easy if you can use windows but the only thing I want to use windows for is looking out of... anyway eventually sorted it all out and its now on the laptop, this is a much easier system to program, much more user friendly as it doesnt require a 12v supply, it takes power to program it from the usb port. my only slight (and it is slight, I have to remember not to be a heavy handed oaf) gripe is that the adapter for the lead is very delicate and prone to static, its six pins bridge the red circles. the other bridge (circled in blue) is interesting as it allows you to swap between two different programs while out and about. useful if you have an optimised set up for super unleaded and then have to fill up with a lower grade of fuel. thoughts so far are that this system is all round more user friendly, easier to wire in, easier to program, easier to buy and most importantly in yorkshire, cheaper
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Post by buster on Aug 29, 2022 16:25:12 GMT
so to fit an nx250 dominator pulsar I had to make this bracket, I know its hard to believe but its a lot more precise than it looks and was painfully difficult to make. I wanted to use the nx250 pulsar though because theres already a profile for that bike in the cdi programming set up. so pulsar fitted and wiring modified (so I can switch between the two cdi's if I wish) problem now is its running like a sack of spanners low down but when revved through it does feel to be advancing, more tweaking needed
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Post by buster on Aug 30, 2022 15:06:28 GMT
I think I'v had a stupid moment here (again), my lovely bit of fabrication (alright then, precision bodging) I suspect is acting as a faraday cage? and upsetting the pulse signal. need a better brain that understands that sort of thing to be certain, easier all round to admit defeat with that pulsar. the honda crf450 pulsar looks half reasonable though and I'v got one coming (hooray) dont know when though due to the postal strike .
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Post by buster on Sept 2, 2022 16:20:43 GMT
this looks promising from a crf450, it needs a minor modification, tweak with the pliers to go from 38mm hole spacing to 40mm hole spacing and some stubby spacers (about 5mm at a guess). I'v got a bit of alloy tube, off the shelf at B&Q, that fits perfectly.
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Post by buster on Sept 3, 2022 11:41:16 GMT
I'm so close I can almost taste victory
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Post by buster on Sept 3, 2022 13:13:03 GMT
eureka!
we have lift off euston
so not 100% perfect but I'v ridden factory bikes with worse glitches and I reckon by tweaking a degree here and there it can be got pretty much perfect. I'll also try the crf450 pulsar at some point as that should align better with the pip on the mag wheel.
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Post by buster on Sept 4, 2022 18:07:17 GMT
Scrub the last post. Back to the drawing board
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Post by buster on Sept 4, 2022 19:48:05 GMT
went out for a spin yesterday and it overheated, damn so I limped home and drank some beer and had a moment of inspiration, I'd assumed that all the pips on magneto wheels were magnetic (like the 400n) I was wrong. a quick experiment with a 2p coin and the 450sg mag wheel confirmed no magnetism. so this morning I went back to the 400 mag wheel that I'd already butchered and punched the remaining bit of the magnetic pip out and built it back up with my bodge strip. this might cure all my woes or it might not. if this does work I'll tig it on eventually
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Post by buster on Sept 7, 2022 15:55:37 GMT
this took some tracking down (just the image) but I finally found a pic of an xr600 pulse signal thingy. I was wondering if it was geared down to 720 degrees but it seems it goes behind the primary gear on the end of the crankshaft, so unless I'm missing something thats a signal every 360 degrees? more head scratching/beer required...
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Post by buster on Sept 13, 2022 19:00:41 GMT
so maybe this might work? I think I'v misunderstood HALL sensors, there appears to be two types. theres the type you'd find on a car with ABS and they generate their own small magnetic field that they then use to read passing teeth (fairly complicated). then theres this type that reads a passing magnet and by happy accident the 400 SD's flywheel has a magnet built in (betting the polarity is wrong ) so will this work?
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Post by buster on Sept 14, 2022 14:42:44 GMT
a brief experiment with an old bit of magnet, first rob a coffee jar lid, then lay magnet in lid and then float it in a bucket of water. it always orientates itself to the south meaning that its a north pole magnet. then offer it up to the magnet on the (new) flywheel and bingo it sticks, so the polarity of the flywheel magnet is south, which going by what I'v read is what I need time for some more bracket bodging I feel , stainless this time...
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Post by buster on Sept 18, 2022 10:04:50 GMT
slight issue with the stainless, theres stainless and theres the cheap grades, this is obviously the cheap grade the whole idea of using stainless was to eliminate any magnetic interference. so a quick trip to B&Q and this was procured, 38mm angled aluminium with some cutting and bodging it should hopefully do the job, more later if I get time
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Post by buster on Sept 19, 2022 16:40:42 GMT
so, bodged up a bracket this afternoon, mounted the sensor and wired it up. nothing. bugger. turns out this sensor wants a north pole magnet
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Post by CTB on Sept 19, 2022 17:40:12 GMT
Jesus Paul you have the patience of a saint
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