Bike won't start - help!

[paulbaker1954]

Have you synced carbs recently. I synced mine a while ago, finished job and she wouldn't start because stupidly I had left the vacuum connection screws on the bench. Put them back in and problem solved

Sound like you may have a vacuum leak

[Rob.b (Rob Birkett - RIP)]

Ok it's time for me to add my two penneth, I hope you don't mind I don't think I've got anything amazing to say but I have been reading these threads with interest and even thinking about them in the small hours so it's time for me to contribute.

I want to suggest that it is not feel related and the reason I think this is because the bike began to be hard to start and then wouldn't start at all. Since then you have done lots of checks and fixes including putting fresh petrol in it even easy start still nothing. Then one day with a new fuel supply made it start and it ran fine then it stopped and wouldn't start again just doesn't sound sensible that it's fuel given that we checked everything in the fuel line.

I am going to go back to possible electrical problems; you say it sparks. Is it a nice big fat blue spark or a whmpy little orange one, also is it sparking reliably does it always spark when it should, has the timing had chance to slip and then get in the right orientation and then slip off again is the ignition switch working properly is the Killswitch working properly all of the taking the fuel tank on and off are you disturbing a wire aound the coils?

Two nights ago starting at 11pn I set off from home on my Cb500 and did 270miles down into mid Wales then home up the A49 it was brilliant,  anyway I started to think about your bike and I began to think about electric issues because it's intermittent and the fuel system has had a very thorough going over.

Hope this is of some help. I'm desperate to find out what's going on with your bike.

Rob

[MCTID]

I reckon Chris400F has the solution........try running it without the Fuel Cap to check whether the vent hole is blocked or not. You didn't say whether you had checked it but when you ran it from a Auxiliary Fuel tank it was OK.

I had a Lambretta years ago (I know but I was only 16) that ran OK for a while then cut out - after checking there was fuel in the tank (under the seat) it ran OK again for a while. Same again.........eventually discovered that it was my Over trousers which I kept stored under the seat which was blocking the vent hole.

Just try it.

[JustcallmeMrT]

Have you synced carbs recently. I synced mine a while ago, finished job and she wouldn't start because stupidly I had left the vacuum connection screws on the bench. Put them back in and problem solved

Sound like you may have a vacuum leak

I had hopes this would be the issue as I headed to the shed this morning, but unfortunately not.  All the vacuum connections were nice and tight.

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[JustcallmeMrT]

I reckon Chris400F has the solution........try running it without the Fuel Cap to check whether the vent hole is blocked or not. You didn't say whether you had checked it but when you ran it from a Auxiliary Fuel tank it was OK.

I had a Lambretta years ago (I know but I was only 16) that ran OK for a while then cut out - after checking there was fuel in the tank (under the seat) it ran OK again for a while. Same again.........eventually discovered that it was my Over trousers which I kept stored under the seat which was blocking the vent hole.

Just try it.

I just went out and checked - no difference with the cap on or off.

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[tom400f]

How about those of us in range all meet up at Mr T's for a group effort? I'm in.

[JustcallmeMrT]

How about those of us in range all meet up at Mr T's for a group effort? I'm in.

I'd be very glad for the help!

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[K2-K6]

I'd help with looking at it as getting a few heads together could possibly grasp something missing in our more remote efforts.

Got a few tools like decent compression tester, meter, strobe etc that may assist with a more comprehensive look through the bike.

Let us know a time, etc to see if I can match up.

[Seabeowner]

Mr T, Sent you my no earlier. Did you get it? If you are working days, can come Tuesday eve.
Cheers

[JustcallmeMrT]

Well fellas, I work days so any evening after 6 would work for me, or potentially next Sunday, if the mechanic I've contacted hasn't picked up the bike by then.  Let me know how things work for you all.

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[tom400f]

It's raining all week

Sat/Sun, possibly. Might be dry then... :\

[JustcallmeMrT]

Finally gave up and had the bike in to a mechanic.  Turns out it is the coils.  When I checked them with a multimeter it seemed fine, but they swapped in a new set and it runs fine again.  I can't believe my Dyna ignition and dyna coils have both fried withing a few weeks.  I'm going to make a warranty claim.  Has anyone else had these kind of problems?

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[mike the bike]

I've got Dyna coils and ignition on mine.  Perhaps you've got the wrong resistance.

[JustcallmeMrT]

I've got Dyna coils and ignition on mine.  Perhaps you've got the wrong resistance.

5 ohm?

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[JustcallmeMrT]

I've got coils and ignition receiving switched power via the motogadget m-unit auxiliary output, and the blue and yellow wires going from the ignition to the coils.  The coils are 5 ohms.

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