simpson j Posted February 11, 2016 Share Posted February 11, 2016 Hi will the lgnltlon tester fit a roto ignition ? John Quote Link to comment Share on other sites More sharing options...
Marc Osbourne Posted February 11, 2016 Share Posted February 11, 2016 Did you ever get this running?? Quote Link to comment Share on other sites More sharing options...
simpson j Posted February 18, 2016 Share Posted February 18, 2016 Hi re roto 25 ? My engine will not start fitted new ignition from Roto ?still will not start .sent to Roto sent back to test .Roto replied Ok ?. I did a rebuild to carburettor. Fuel is getting through to exhaust . Battery ok.Any ideas ? Quote Link to comment Share on other sites More sharing options...
cymaz Posted February 18, 2016 Share Posted February 18, 2016 Can you get any spark from it? Check by earthing the plug on the out side of the casing and rocking the prop across the pick up to cause a spark....( you would have done that already, yes? ) Are the carb needles back to factory settings? If they are, richen the LSN by 1/16. Tell us exactly the setup, needles, everything....photos if possible Have a look through this thread, you might come up with something. Also it might be worth emailing Michael Chow on the thread. He seems to be the main man for ngh Edited By cymaz on 18/02/2016 19:26:06 Edited By cymaz on 18/02/2016 19:28:01 Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted February 18, 2016 Share Posted February 18, 2016 My moneys on your plumbing, if it works for them it should work for you, only difference is your plumbing or your priming, you've already stated your battery is o.k. John Quote Link to comment Share on other sites More sharing options...
cymaz Posted February 18, 2016 Share Posted February 18, 2016 If nothing has been touched since it came back from the Roto boys then it sounds like the plumbing. Have you left the tank open to atmosphere ? Quote Link to comment Share on other sites More sharing options...
simpson j Posted February 19, 2016 Share Posted February 19, 2016 Hi I have this on a test stand ? Only sent ignition back .roto sent back ok. I have fitted new plug all are new 4 no from Roto ? I did a rebuild to carburetor. All new parts? Last time it was in wot 4xl it started then stopted and I fitted a new ignition and rebuild carburettor any ideas John Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted February 19, 2016 Share Posted February 19, 2016 Hard to help from here John, try taking the plug out and putting a drop of fuel in, be careful you don't lock it up. Then see if it will fire up ? that should eliminate ignition and battery being at fault. John p.s are you sure the throttle is open, have you tried moving the stick/rod up a bit ? Edited By john stones 1 on 19/02/2016 13:32:45 Quote Link to comment Share on other sites More sharing options...
Peter Burgess Posted February 19, 2016 Share Posted February 19, 2016 Make sure that the throttle is 1/4 open and use a geared starter if possible. Otherwise give Just Engines a call. Once you get it going the NGH 17 is a great engine, very pleased with mine. Quote Link to comment Share on other sites More sharing options...
cymaz Posted February 19, 2016 Share Posted February 19, 2016 The only thing I can think of now is which way is the magnet and/or pick up detector? Could it be ( and I'm clutching at straw now as I'm running out of ideas) that if the magnet or the detector is the wrong way round then the spark would not be made. It would seem that if the ignition box has been given the ok then it might be that the magnet is the wrong way round....no idea after this Quote Link to comment Share on other sites More sharing options...
Steve Balaam Posted February 19, 2016 Share Posted February 19, 2016 I bought an NGH 25cc Petrol engine which was difficult to start and wouldn't run properly. Just Engines diagnosed the timing was out 12 Deg since timing has been reset it runs and starts nicely. I purchased a timing set up kit and now check every engine before running for first time. Might be worth checking timing is set I believe 28Deg before TDC Quote Link to comment Share on other sites More sharing options...
simpson j Posted February 20, 2016 Share Posted February 20, 2016 Hi I ran a magnet on the detector with the plug out and Earthed l had a spark ? Would the magnet be faulty has enybody had this ? So the ignition ok what next ? Quote Link to comment Share on other sites More sharing options...
cymaz Posted February 20, 2016 Share Posted February 20, 2016 Ok, you have spark, you have fuel dripping from the exhaust ( therefore fuel in the cylinder). It then has to be the timing is soooo far out , needle settings or it needs a geared starter to spin it over fast enough. I am out of ideas now. If you were down near me at North Cornwall I'd say "bring it over". It's got me mystified. Edited By cymaz on 20/02/2016 15:40:25 Quote Link to comment Share on other sites More sharing options...
simpson j Posted February 20, 2016 Share Posted February 20, 2016 Hi I fitted the detector upsidedown and I have a spark .l Quote Link to comment Share on other sites More sharing options...
cymaz Posted February 20, 2016 Share Posted February 20, 2016 Hooray But does it start? Quote Link to comment Share on other sites More sharing options...
Braddock, VC Posted February 20, 2016 Share Posted February 20, 2016 On my ngh 9 it's possible to fit the prop driver 180 degrees out, there being two flats machined on the crankshaft to locate the prop driver. I can't remember if it's possible to do the same with my ngh 25. As I don't have the 17 I don't know at all. Both engines behave well, start ok but both have to be pretty "wet" to get the initial start of the day over and done with. Quote Link to comment Share on other sites More sharing options...
simpson j Posted February 22, 2016 Share Posted February 22, 2016 Hi all I started my engine to day with hall sensor upsidedown ok and it works Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted February 22, 2016 Share Posted February 22, 2016 Magic Quote Link to comment Share on other sites More sharing options...
cymaz Posted February 22, 2016 Share Posted February 22, 2016 Posted by cymaz on 19/02/2016 18:03:39: The only thing I can think of now is which way is the magnet and/or pick up detector? It would seem that if the ignition box has been given the ok then it might be that the magnet is the wrong way round....no idea after this I refer the honourable gentlemen to the reply I gave some moments ago.......( in the smug zone) Really glad you got it sorted . Unidentifable spark ignition problems are a complete PIA Quote Link to comment Share on other sites More sharing options...
cymaz Posted September 27, 2020 Share Posted September 27, 2020 A club member has a problem with his NGH GT17. Starts and runs on idle nicely. Picks up and revs well......that’s when the problem starts 30 seconds from idle to WOT the engine tightens up considerably, slows and stops. everything else is great. Starts well, idles well, draws fuels well, easy to tune. The only thing we could come up with is that the piston ring has an incorrect gap, causing it to bind on the cylinder when up to operating temp. Am I clutching at straws or onto something??? Quote Link to comment Share on other sites More sharing options...
Brian Dorricott 1 Posted September 27, 2020 Share Posted September 27, 2020 Won't help with the tightness but I replaced my sparkplug with the OS G5 glow plug in my NGH17cc because my CDI units got burned in a fire . Starts and runs lovely on test bench but the NGH is still a bit noisy for our field and I don't have anything suitable to put it in at moment . Really can't see any difference between CDI or glow plug running and for £7.50 it's worth a try , one less battery and CDI unit to fit . Some people say it has problems in tuning but they are modding a glow to petrol but the NGH is already petrol all your doing is replacing the ignition ! Quote Link to comment Share on other sites More sharing options...
Bob Cotsford Posted September 27, 2020 Share Posted September 27, 2020 Posted by cymaz on 27/09/2020 09:37:02: A club member has a problem with his NGH GT17. Starts and runs on idle nicely. Picks up and revs well......that’s when the problem starts 30 seconds from idle to WOT the engine tightens up considerably, slows and stops. everything else is great. Starts well, idles well, draws fuels well, easy to tune. The only thing we could come up with is that the piston ring has an incorrect gap, causing it to bind on the cylinder when up to operating temp. Am I clutching at straws or onto something??? Can you check the ignition timing? Even better if you can try it with another ignition unit from a known working engine. I'm thinking timing advance issues caused problems back when we ran manual or mechanical advance/retards on motorbikes. Other than that you would have to think something is distorting as it warms up, or possibly a bearing on it's way out? Quote Link to comment Share on other sites More sharing options...
Engine Doctor Posted September 27, 2020 Share Posted September 27, 2020 Posted by simpson j on 22/02/2016 16:18:04: Hi all I started my engine to day with hall sensor upsidedown ok and it works Ok you have taken the prop off on the top and bottom pic ? Painting the prop tips white or yellow gives a definite visible ring to avoid when its running . Quote Link to comment Share on other sites More sharing options...
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