Deskpilot Posted March 25, 2018 Author Share Posted March 25, 2018 Thanks Meth, that confirms a type 'A' with a spacer plate. Link to comment Share on other sites More sharing options...
Deskpilot Posted March 30, 2018 Author Share Posted March 30, 2018 OK my friends. Another question. My engine is now fully back together, mechanically speaking , and it's time to sort the electrics. Unfortunately, the wiring harnesses were cut to pieces by some-one so I have to figure out what connects to what. Google, usually my best friend, doesn't help. So, can you help. First image shows the leads coming out of the magneto. Colours are from top down, green with black stripe, yellow with black stripe, plain green, plain yellow There should be, according to google, a grey wire for the tacho. Top left are the leads from the ignition coil? set bottom left, under the blue wires. Clearer view. Where do the remaining leads go? Am I missing some parts? Out of interest this is how it's looking. Will be changing plugs leads with Red cables and heads . Thanks for any help you can offer. Link to comment Share on other sites More sharing options...
Deskpilot Posted April 6, 2018 Author Share Posted April 6, 2018 No one? I think the engine may be a very early one and have a 377 magneto as that didn't have the grey wire. Possible? Link to comment Share on other sites More sharing options...
Deskpilot Posted May 8, 2018 Author Share Posted May 8, 2018 Writing this whilst waiting for my heart to slow down Been struggling to get my 503 started after a full strip down and rebuild. Had a good spark, cleaned the carbie, adjusted the timing and all that but I couldn't get a pop out of it. Late this evening I thought I'd try something else. I pored fuel into the cylinders And pulled it through. Nothing. Rechecked the spark, OK, pulled it through on one cylinder, nothing. Replaced plug pulled it again and it roared into life at about 300 revs. Scared the sh*t out of me. I closed the throttle to a more sedate rate and shorted the 2 wires that I thought were the kill switch connection and it kept running. Resorted top pulling off the plug leads and when all was quiet, except my heart pounding in my ears, I came in and called it a night. WOW, I so did not expect ti to start. First time in over 5 years when it was last ground run. Now the questions are, 1, will I sleep tonight, and 2, will it run again tomorrow. Time will tell and I'll let you know. Link to comment Share on other sites More sharing options...
Deskpilot Posted May 11, 2018 Author Share Posted May 11, 2018 Answers. Yes, I slept well. No it didn't run again. After a backfire that ripped the pull cord painfully from my hand, I thought perhaps I had the ignition too far advanced so I re-timed it to a slightly later firing point. Still no luck. I'm wondering now, why is it so hard to pull over. I seem to have extremely high compression in both cylinders (gut feel only). It turns quite easily with the plugs out. Also, I have to pull the cord a long way out to get it spinning. There seem to be about a foot of cord pull before the motor turns over and then it comes out another 2 feet or so. Is this normal?. Suggestions please. Link to comment Share on other sites More sharing options...
Thruster88 Posted May 12, 2018 Share Posted May 12, 2018 Hi deskpilot The choke only works when the throttle is completly closed no choke no start The black wire going to the coil is grounded to stop the engine they must be kept seperate ie double pole switch If the points gap is set correctly the timeing should be right Link to comment Share on other sites More sharing options...
Deskpilot Posted May 13, 2018 Author Share Posted May 13, 2018 Thanks for the info mate. Link to comment Share on other sites More sharing options...
Thruster88 Posted June 3, 2018 Share Posted June 3, 2018 Hi Desk pilot Did you get the 503 going, is it for the single that's on the trailer? Link to comment Share on other sites More sharing options...
Deskpilot Posted June 3, 2018 Author Share Posted June 3, 2018 Yes and no mate. Yes it will go on the T84? on the trailer. Yes I got it going twice but only for a short time. I've checked the carbie and all seems well. My next check will be the pump as I'm not certain that it's working. My filter is between the pump and the carb' and whilst I can prime so that fuel fills the filter, it seems to run dry. Possibly a perforated/dis-integrating diaphragm(the reason why I put the filter there). Another, and probably the biggest problem is that it seems to have extremely high compression and I find it hard to pull it through with any force. 'Course, it could be that I'm just bloody weak. Link to comment Share on other sites More sharing options...
Deskpilot Posted June 5, 2018 Author Share Posted June 5, 2018 OK, diaphragm is sound so I gave it another try. After pouring some fuel into the front cylinder, replaced the plug and 'gently' pulled it through a couple of time, a more strenuous pull resulted in the pull cord being ripped out of my hand when the engine back-fired. Found a gardening clove and tried again. Engine roars into life. Reset the slow running and mixture.My wife comes into garage and is talking to me, can't hear a bloody thing she's saying. Rotax exhaust appears to be useless. Garage now filling with smoke so time to pull the plug leads off. Wife tells me to put in some earplugs........a bit late pet. Thing is, do I now dare mount it on the plane? Nah, a few more test runs I think. Can't find my earplugs so it'll have to wait till tomorrow. Link to comment Share on other sites More sharing options...
Thruster88 Posted June 5, 2018 Share Posted June 5, 2018 Hi Doug I had a 13hp Honda on an auger, if I didn't pull it hard enough it would snatch the handle for my hand Link to comment Share on other sites More sharing options...
Deskpilot Posted June 6, 2018 Author Share Posted June 6, 2018 Can be painful can't it mate. Another lesson learnt though. cheers Link to comment Share on other sites More sharing options...
Deskpilot Posted June 9, 2018 Author Share Posted June 9, 2018 OK, another day to try and start my recalcitrant 503 and video it. At the present time, I don't have a throttle cable so a piece of string suffices to lift the throttle slide assembly. Here goes. DSCF5412.AVI DSCF5412.AVI Link to comment Share on other sites More sharing options...
Deskpilot Posted June 9, 2018 Author Share Posted June 9, 2018 OK, another day to try and start my recalcitrant 503 and video it. At the present time, I don't have a throttle cable so a piece of string suffices to lift the throttle slide assembly. Here goes. Sorry, video won't load but just to let you know, it ran after I enriched the mixture. Link to comment Share on other sites More sharing options...
Deskpilot Posted June 9, 2018 Author Share Posted June 9, 2018 https://drive.google.com/file/d/1TVyC17FrBAcqG_CJv1R2__ilDx_fgRsK/view?usp=sharing https://drive.google.com/file/d/1oorAat0MdIiiJrRICSEVFO0dyKTXrnWH/view?usp=sharing Link to comment Share on other sites More sharing options...
Thruster88 Posted June 9, 2018 Share Posted June 9, 2018 Hi Doug The 503 sounds healthy enough The relationship between throttle and choke can be tricky The choke on a Bing 36 is a valve that allows more fuel to enter provided there is sufficient suction ie throttle closed Opening throttle on cold engine can cause stoppage Having the choke on with a hot engine will result in no start Link to comment Share on other sites More sharing options...
fly_tornado Posted June 10, 2018 Share Posted June 10, 2018 first few pulls on a 503 engine is just to get fuel into the bowls, on my 503s they have a manual primer that pumps fuel directly into the carb. probably need to buy an electric fuel pump for redundancy and easier starting Link to comment Share on other sites More sharing options...
IBob Posted June 10, 2018 Share Posted June 10, 2018 Wow, reading that, I just relived all the old motorbikes of my youth...and that moment they come to life after being a heap of bits................) Link to comment Share on other sites More sharing options...
facthunter Posted June 10, 2018 Share Posted June 10, 2018 I presume you have a prop on the motor. If you don't have much of a flywheel effect you will just about get your hand pulled off, cord starting it. Eliminate the pump as a problem with a gravity system for testing. Don't test an engine without the kill switch definitely working. and the throttle mechanism connected.. Nev Link to comment Share on other sites More sharing options...
jabiruken Posted June 12, 2018 Share Posted June 12, 2018 Just a thought, u do have a hole in that vent hose to allow air in carb. It’s difficult to see in video, I used to make it a big v with side cutters to ensure it did not clog. Link to comment Share on other sites More sharing options...
Deskpilot Posted June 12, 2018 Author Share Posted June 12, 2018 Yes Ken, all is as it should be except perhaps, the tuning. I'm not sure that that the tube is used to get air into the car though. I thought it was a balancing device of sorts. Link to comment Share on other sites More sharing options...
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