Bad cold starting.

[pagan1001]

Dataracer these were new plugs and the iridium ones. But yeah I have looked into the flooding and drained the float chambers and turned the fuel off and cranked the engine, even drained the fuel tank and put in new fuel with a higher octane, but still nothing so am going with the dry fuel mix that Kevin mentioned as its the only thing left to try. If that works then I can narrow it down to the fuel system. But there has to be some problem as you should not have to use additive in the fuel. But cheers for all the info & help and I will let you know how this stuff works when I get home today............. cheers guys!!!.

[Neosophist]

Cheers for that mate have just been reading about dry fuel & it sounds great am going to halfords tomorrow so will let you know how I get on. It has to be something like that cause I got my bike back today a friend of mine ran all the tests on the ignition system & low and behold it checks out okay. Can you tell me how water or ice enters the tank & carbs so quickly????. Or is this just one of those common problems???. Anyway sounds like your on to something.........how did you know to try this product??? Thanks loads anyway and I will let you know what happens okay........ cheers.

Never had carb icing / water problems on these engines even riding around in the -4's.

Just drain your tank into a container and drain the carbs out too and put some fresh fuel in there (minimum 85 ron) and that'll narrow out your fuel.

Cheaper than spending money on some aditive that you shouldn't / dont need.

If you are getting water in there chances are you have a fuel cap leak and its been rained on.

[SimNC30]

Interesting....

I've got a similar problem with cold starting - full choke, hit the starter button and it splutters (sounds like it is only firing on two cyls maybe) and nearly catches and turns over but can't quite manage it first time. Once it's running it runs sweetly but it's a very annoying problem to say the least. Sometimes it will burble very weakly, sounding like it's only sparking on one or two cylinders but never quite running properly. Also occasionally when it's just started and is warming up at idle and you blip the throttle it cuts out plus it never seems totally happy just ticking over, although that may be the idle speed as it eventually likes to cut out when I turn the choke off. I put fresh spark plugs in it a few days ago and it hasn't helped, am I correct in thinking that if it's only a problem with starting then it's electrical?

Could be a few things

Out of spec valve clearances will make starting hard
Could be a blocked pilot jet, choke lever not engaging fully, or other carb related problem.
Could also be electrical.
Stale / Old / Contaminated Fuel
Gummed up plugs.

There fussy to start anyway, any throttle before its ticking over usually kills it.

Thanks for your suggestions Neosophist. I'm pretty sure it's not the carbs because I've had them off recently, cleaned them up and not ridden it much since then. I'm thinking it might be old fuel so before I go to ride it again i will drain the carbs and tank and put fresh fuel in and see if that helps. My fresh plugs haven't helped but I haven't check them to see how well they are sparking so that's next on my list and then I can work out whether it's electrical or not.

Thank you,

Si

[pagan1001]

Cleaned the fuel tank out and removed the carbs which also got a good cleaning and wow they were needing it!. Also did the carb sync when they were back on. Once the tank dried put in clean fuel the highest octane I could find!. Also added the dry fuel and tried to start her.............. the same! no start then maybe on the 8th try I connected the car up to give her a jump and she fired up (the car was not turned on!). That was days ago and not had a problem since. Try the dry fuel and a good carb and tank clean. If anyone needs the proper jet sizes and pilot screw turns for the carbs on a nc24 please get in touch as I do have all specs and all torque figures for other parts. Cheers for everything guys fantastic, and its a cracking day to get out!

[Neosophist]

You shouldn't need dry fuel additive in high octane fresh fuel as there'll be no water contamination?

The NC24 was designed for Unleaded 91 octane, so unless you live somewhere where they still have 85/88 gas, you can use pretty much anything... the UK minimum ron for Unleaded is 95 :-)

And yes.. after draining them dry you'll probably flatten the battery trying to get it going, you'll need to crank it over a few times and wait a few minutes for the petrol to drain from the vaccum operated tank into the carbs.. then you should get it going. :)