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Post by shepped0 on Feb 13, 2023 20:21:07 GMT
Hi All
I am new to your forum and in desperate need of help
I have been looking for a good forum specifically on these very old bikes
I am unable to start my 1939 james autocycle 90cc
I have changed the fuel and it is getting a good supply from the carb
I have a very good spark
I have excellent compression
I have tried to bump it down the road and it pops but does not want to continue firing which makes me feel it is something to do with timing
The bike did start 3 years ago so i know it will go but i have now exhausted my ideas
Any help or guidance would be extremely welcome as this was my late fathers bike when he was 19 years old and in the RAF
Kind Regards
David
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Post by davwat on Feb 14, 2023 18:51:21 GMT
1939 So it should be the original Junior engine with a fixed head, don't worry if it is a latter engine that has a detachable head. The reason I ask is if you have petrol and sparks it should go! unless it is sparking at the wrong time? Have you checked timing? it is slightly different depending on which engine.
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Post by shepped0 on Feb 14, 2023 19:01:26 GMT
Hi Davwat
Thank you for coming back to me i am still learning about this engine.
I have got some pictures that i can post
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Post by davwat on Feb 14, 2023 19:12:55 GMT
Is your engine like this? 
Also you said petrol from the carb, does that mean you are getting a wet plug? |
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Post by shepped0 on Feb 14, 2023 19:31:58 GMT
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Post by shepped0 on Feb 14, 2023 19:33:56 GMT
tried to copy the picture of the engine but file is too big
Yes i am getting a wet plug and petrol is coming through carb too very good spark too so i think its timing i will try and do some more piuctures
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Post by davwat on Feb 14, 2023 19:42:32 GMT
tried to copy the picture of the engine but file is too big Yes i am getting a wet plug and petrol is coming through carb too very good spark too so i think its timing i will try and do some more piuctures That looks a dodgy engine number to me (but it doesn't matter to get it running).
or is your engine like this? 
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Post by shepped0 on Feb 14, 2023 20:06:56 GMT
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Post by shepped0 on Feb 14, 2023 20:14:04 GMT
will try and get some more pictures tomorrow when my daughter gets home
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Post by davwat on Feb 14, 2023 20:48:51 GMT
will try and get some more pictures tomorrow when my daughter gets home That's fine, it's an early Junior. The points gap should be 15 thou (but you did say you have a good spark so should be about right) Bit of a faf on these engines but take the spark plug out, you can see the piston coming up, the points should just to start to open when the piston is 7/32 from the top.
PS Don't forget the flywheel goes anti clockwise on these.
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Post by JamesCentral on Feb 15, 2023 16:39:16 GMT
That looks a dodgy engine number to me (but it doesn't matter to get it running).
Yes, that number wasn't stamped by Villiers ... but I guess someone might have changed the casting and stamped the original number on it. The flywheels on these engines aren't keyed to the shaft so can slip if the nut isn't tight enough, so timing is your best bet for the fault. If that is the cause, do up the nut really tightly once you have it correctly set - the proper Villiers spanner for the job is designed to be hammered, which might give you some idea of how tight.
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Post by shepped0 on Feb 15, 2023 19:06:55 GMT
That looks a dodgy engine number to me (but it doesn't matter to get it running).
Yes, that number wasn't stamped by Villiers ... but I guess someone might have changed the casting and stamped the original number on it. The flywheels on these engines aren't keyed to the shaft so can slip if the nut isn't tight enough, so timing is your best bet for the fault. If that is the cause, do up the nut really tightly once you have it correctly set - the proper Villiers spanner for the job is designed to be hammered, which might give you some idea of how tight.
Hi Thanks guys for your responses I will take out the plug a double check but i definatly have a good spark. I have been told that flywheel may have slipped as it is not keyed and i am guessing here is my issue I am little confused on how to rectify this ...someone told me it a big job but i am confussed on this ...it can only be the problem as i have checked everything else Guidance on this would be appreciated or better still some kind of video would be great. I am very much a novice with these so i am sorry if this is a silly question Kind Regards|David |
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Post by shepped0 on Feb 15, 2023 19:14:03 GMT
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Post by davwat on Feb 16, 2023 22:44:06 GMT
Yes, that number wasn't stamped by Villiers ... but I guess someone might have changed the casting and stamped the original number on it. The flywheels on these engines aren't keyed to the shaft so can slip if the nut isn't tight enough, so timing is your best bet for the fault. If that is the cause, do up the nut really tightly once you have it correctly set - the proper Villiers spanner for the job is designed to be hammered, which might give you some idea of how tight.
Hi Thanks guys for your responses I will take out the plug a double check but i definatly have a good spark. I have been told that flywheel may have slipped as it is not keyed and i am guessing here is my issue I am little confused on how to rectify this ...someone told me it a big job but i am confussed on this ...it can only be the problem as i have checked everything else Guidance on this would be appreciated or better still some kind of video would be great. I am very much a novice with these so i am sorry if this is a silly question Kind Regards|David Yep defo do that basic check of points just opening before the piston reaches 7/32ish before TDC. Also there should be mark on the flywheel that lines up with a mark on the magneto backplate, when the piston is at TDC.
Lining the marks up usually gets the thing running, setting it exactly is a bit of a faff on this engine.
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Post by shepped0 on Feb 17, 2023 15:30:37 GMT
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