Hi, I've had my NC30 over 4 years now, and its been barely ridden for the last 2, around 800 miles, due to time constraints. It has been SORNed for one year, so I've started it up every month and given it a ride up and down the street but nothing more than that and its been fine , only riding up to speeds of 25mph due to space.

I've finally got time to ride it now, so planned to get MOTed, got the bike started perfectly full choke (4k revs) for a couple of minutes then take the choke off , idling for another few mins while I get ready. So I ride off, get to end of street and the bike starts to drop revs then dies (tried opening throttle but didn't stop revs from dropping), so I'm thinking maybe its still too cold and I've flooded engine, used to happen a lot when I first got bike. So tried again nothing. So I leave it for a 1 hour. then try again , this time its starts full choke but hangs at 1.5k then dies. Waited two days tried again, the same thing, so thinking spark plugs fouled, I get them out , they are wet, so attempt to clean them and try again, same issue, this time no catch at all.

Bought new spark plugs fitted them (a week later) still same problem. It does rev for around 20 seconds (at 1.5k not the usual 4k) but slowly dies, so its not like its not sparking at all, if I try to start it again it doesn't catch at all, and I don't want to foul the plugs

Now I've read through as many old forum posts (I apologise if I've missed a similar thread), and I'm thinking some kind of ignition failure, but not sure. My thinking is it should still have ran on 2 cylinders, so no HT issue, Am I correct?

Can anyone help? What else should I check?

The Battery is new and on trickle charger and connected properly
Almost certain carbs are set up correctly, (Did the carby set up guide around 3 months ago, and has been started several times and ridden slowly without this issue)
New spark plugs
Vacuum hose is in good order

Sorry for long post

Thanks
Sam

Hi, I'd give the carbs and jet a good clean. And burn all the petrol off the spark plug with a blow torch or on a gas hob, get the electrode tips really hot. And put some new fuel in it too.
Cheers
Ian

Sorry just edited the original post after your comment, it has new spark plugs in, emptied the tank and filled with new fuel, the carbs are clean as well. I've tried to rule out as many things as possible

I would check the routing of the fuel line- it sounds like either, the vacume pipe is collapsing or damaged, Or the fuel line is kinked and starving the engine of fuel.

skinnydog0_0 wrote:I would check the routing of the fuel line- it sounds like either, the vacume pipe is collapsing or damaged, Or the fuel line is kinked and starving the engine of fuel.

Or the tank breather is clogged.

I think this is definitely a fuel related issue.

So the plan was to bring the bike back to perfect health 5 months ago before I moved away and I thought id done that then this issue occurred. Now I've moved away I only come back once a month , so I tried starting the bike each weekend I returned , no luck, I gotta admit I started to lose heart because I would have only a few days to strip and fix the issue. Anyway I came home last weekend I decided to sort the issue out once and for all. Started removing panels and tank, removed the air filter and ...... 4 soggy kitchen tissues blocking the air intakes for the carbs . Removed and the bike started perfectly. I was so happy ! and annoyed at myself. I missed another summer, anyway now its all done and ready, heres to next summer/spring!

LMAO! That has got to be a new one...

Glad you found it.

Honestly I don't know how I missed it, very embarrassing indeed

Thanks