Bike won't start - help!

[royhall]

What did it run like when it started?

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[tom400f]

So, if it is related to fuel delivery yet affects all cylinders, do you have some sort of air lock in the fuel tap or thereabouts?

[JustcallmeMrT]

What did it run like when it started?

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Ran great, even settled into a nice idle.  Revved up nice too.

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[JustcallmeMrT]

So, if it is related to fuel delivery yet affects all cylinders, do you have some sort of air lock in the fuel tap or thereabouts?

Might be worth looking at.

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[Chris400F]

If you are looking at fuel delivery it would be worth checking there is a vent in the cap.
Needs to be something to let air in or you will get a vacuum in the tank.

[deltarider]

And inline fuel filters are known to cause fuelflow problems too.

[JustcallmeMrT]

And inline fuel filters are known to cause fuelflow problems too.

I'm just running the stock filter in the tank.

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[K2-K6]

Well, it's running again.  I was wracking my brain for anything I'd done differently before it all went wrong and realised I'd topped off the tank with premium instead of my usual regular petrol.  In an off chance I got a jerry can of regular, drained the carbs and hooked up an auxiliary tank, and it fired second kick.  Started 5 more times after that, so hopefully problem solved.  Still doesn't make any sense though.

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That is strange because it should of fired on easy start in that case.

I had a car recently that I'd inadvertently flooded (at the point of not running I hadn't got to that diagnosis) but trying to get it to go I took off the mass airflow meter and sprayed easy start past the throttle into the plenum and it didn't even cough any combustion in the cylinders but did ignite the easy which blew back out past the throttle,  the motor seemed too fuelled heavily to even do anything. Eventually I realised it was too rich, pulled the fuel pump fuse and cranked it till it went, NGK plugs too and still in there ok 3000mls later.

[K2-K6]

MrT, are you saying that when it was just recently running It was supplied from your alternative source? and is it now back onto it's own original tank supply?

If so then it would still suggest the tank has something is it that won't fire properly. So you may have the reasons in front of you.

If you've just filled the float bowls with an alternate supply and it ran ok then it's not the jets in the carbs.

The float bowls when filled will easily run these bikes for about 3to5 miles so it will do as you've found and start\run for a fair time on that supply. When you put the task supply back on it will mix the two again and possibly stop it from igniting again.

I'd remove all the fuel from the bike and put about 5 litres of known good supply in there to see if this checks out.

[deltarider]

Well analyzed, K2-K6! Hope for him this is it.

[JustcallmeMrT]

MrT, are you saying that when it was just recently running It was supplied from your alternative source? and is it now back onto it's own original tank supply?

If so then it would still suggest the tank has something is it that won't fire properly. So you may have the reasons in front of you.

If you've just filled the float bowls with an alternate supply and it ran ok then it's not the jets in the carbs.

The float bowls when filled will easily run these bikes for about 3to5 miles so it will do as you've found and start\run for a fair time on that supply. When you put the task supply back on it will mix the two again and possibly stop it from igniting again.

I'd remove all the fuel from the bike and put about 5 litres of known good supply in there to see if this checks out.

Unfortunately this is what I did yesterday.  Drained the tank, reattached to the bike, refilled with the same fuel that was in the aux tank when it ran, started the bike again, and all was well.  Then this morning not even a cough. 

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[gordo]

Have you pulled the fuel filter from the tank and checked it.

[JustcallmeMrT]

Have you pulled the fuel filter from the tank and checked it.

I haven't - should have done as due course but have assumed it would be clean as I emptied the tank via the petcock and flow was fine.

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[Trigger]

Have you removed the whole fuel tap ? There should be a gauze which can block.

[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