View Full Version : just wo'nt start
Can anyone help had my nc30 two week's now first the shock (got one of ebay) now it wo'nt start turn's over but just dos'nt fire. it has a brand new battery yuasa starting it i drained it got the spare out charged it fully tryed that one no joy striped the bike today checked all the fuses they are all fine pulled a plug out good spark also had new plugs leads. i've noticed a strong smell of fuel have tryed choke on choke off then nothing no choke tank off still strong smell of fuel. could this be a fuel prob? when i bought it of ebay it had a prob with the fuel only when it warmed up please look at the site listed below as this lets anyone look at the description thank's .........
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=4566631378&ssPageName=ADME:B:EOAB:UK:6
blakeyv4
21-08-2005, 18:04
if there is a strong smell of fuel,maybe the choke is sticking on. when the bike warms up it won't like the choke being on giving it too much fuel, making it run rough. if it won't start now it could be flooded.were the plugs wet when you took them out? also check the condition of the vac pipe. just a couple of thoughts for ya :beer:
Excalibur
21-08-2005, 19:45
Kill switch ????
I do'nt think it's the kill switch unless it is broken how would i check if this is the cause can you bypass this (thanks to all who have replied) keep them coming?????????????
Hants_Tiger
21-08-2005, 21:41
Could of possibly caught a plug under the rear fairing. Follow the wire that comes from the ECU (Mounted right at the back of the bike) and check it hasn't come unplugged. Engine will turn over if this comes unplugged and thats about it, wont fire at all etc
Excalibur
21-08-2005, 23:09
when you had the plug out was it wet ???? If it was bone dry yet you have a strong smell of petrol, any leaks etc
Metanurb
22-08-2005, 02:00
I'd have thought if it was the kill switch or connector then you wouldn't be getting a spark? :dunno:
Hants_Tiger
22-08-2005, 07:18
I know you said you have a spark but when were the plugs last changed? maybe the spark isnt as strong as it needs to be.
It seems odd that you are saying you have a spark and that you can smell fuel. This would indicate fuel is getting through to me. Though maybe to much yes. Maybe a carb strip down to check the floats arent damaged and working correctly too.
Had a similar problem on the wifes 250 hornet. Chech the side stand switch. You may ned to bypass the switch.
baz
update a friend and i striped the carb's down cleaned them all seems fine put them back on still no joy. there is a vacuum pipe that comes off the fuel tap that was not connected we never notised this untill we put it back together? but we did'nt take it off could this be the cause of the prob when it get hot but do'nt no where it goes on to the carb if this is where it goes to. it has a small brass threaded end and just pushes on to the fuel tap at the other end please please let me know if this is causing the prob when it gets hot or could this be a contributing factor to the whole problem also took the spakplug out checked the colour i would say yellow should i change these????????
blakeyv4
23-08-2005, 19:27
was the brass end stuck on the end of the vac pipe when you took it off? if so it sounds like it could be the adaptor for the inlet manifold. it screws into the manifold and the vac pipe fits over it. you should take the vac pipe off at the manifold end when balancing your carbs and one of the pipes from the vac guage goes onto the brass adaptor. the other 3 inlet manifolds have holes for balancing carbs but these are blanked off with screws to prevent air being drawn into the manifold. the inlet manifold that the brass adaptor fits into is number 3. which is the rear cylinder on the right hand side of the bike when you are sat on it. it is a bit awkward to see if you don't know what to look for but you should see a small threaded hole (use a lamp). if this has been missing then it will probably be your problem.
Excalibur
23-08-2005, 19:43
Posted in this thread by EGG on Legs
http://www.bikersoracle.com/vfr/forum/showthread.php?t=25098&highlight=vacum+fuel+tap
Re: Spark plug tool
Quote:
Originally posted by NC24
Hi All
does anyone know how to check that the vacum pipe is workin?
and the fuel tap cos i turned the pipe on when it was up in the air and nothin came out
thanks
Kev
The vacuum taps have 2 pipes, one to carry the fuel the other from the inlet that supplies the vacuum to open the fuel tap. The easy check is to take the pipe off the inlet and suck it, this is sufficient to open it and let the fuel flow through the other pipe.
A further tip here is that whilst you are sucking the vacuum pipe, you can block it with mole grips/arterial forceps and this will hold the fuel tap open so you can run the bike and balance the carbs/injectors without worrying about auxillary fuel supplies.
the funny thing is that the bike ran ok with this off surely this vacuum tappipe is not the cause :bang:
Excalibur
23-08-2005, 21:11
Check it just to make sure it is working now ??
The bike will run with the pipe disconnected till the level in the tank drops ,then it will fire on the odd cylinder,connect the pipe it will start on the button,full choke and no throttle.
I had the same problem on mine :toilet:
still hav'nt found out how to connect the breather pipe up :dunno: this is still a mistery as i never took it off :B but i do have the part from the spare fuel tap :club:
Hants_Tiger
24-08-2005, 10:09
There should be two pipes connected to the fuel tap. One is about 12mm diameter at a guess and this feeds fuel to the carbs. The other pipe is only about 6mm diameter. It connects to the fuel tap to the connector thats there so that it runs parallel to the main fuel pipe.
This 6mm pipe originates from a vacuum point on the carbs. Can't remember which carb now though. Just hoping you haven't pulled it off the carb end too.
MickCheese
24-08-2005, 21:02
There is a fuel tap mod that does away with the vacume part of the tap. details can be found here
www.400greybike.co.uk
Mick
As mentioned earlier the pipe is a push fit onto a small pipe that is located on the inlet manifold ( r/h side as you sit on the bike ) just below the the carb on the right.My pipe consists of three parts ,two flex pieces whitch push into a right angled plastic piece.Hope this is of some help : :f
Excalibur
24-08-2005, 22:36
still hav'nt found out how to connect the breather pipe up :dunno: this is still a mistery as i never took it off :B but i do have the part from the spare fuel tap :club:
If you lifted the tank it's possible thats when it came off ....
new update got the nc30 cd rom found out where the pipe go's onto the inlet manifold fitted it now it's firing but still won't run :bang: tryed to bump it with no joy . p.s the pipe in question it was not on the bike when i got it it was in the bag of spare's when i picked up the bike it was attached to the spare fuel tap :rolleyes: anyone want to buy a k plate vfr :} :beer:
Hants_Tiger
25-08-2005, 06:33
If it wasnt on it, it is possible that the person before has carried out the fuel tap mod as mentioned earlier. If its been done I am guessing if you pull the main fuel line off and turn the fuel tap to the on position fuel will freely flow from the tank.
let me just start by saying thanks to all how have posted replies :) :bow:
firstly this fuel mod is probably been done as i opened the fuel tap when the tank was off. fuel flow was coming from the tank so what now! a mate is coming up to do a continuity test on the electrics if this shows up nothing i'll probably hand it in to a garage let them get it sorted
many thanks (1 pissed off owner) :PUKE:
well here's the news (project won't start) has breathed into life once agian!!!!!. it seems that one needs to start using my brain again.spark plugs where removed cleaned and most importantly regaped how stupid can i get but i need to get a new set some of them are sparking round the plugs
after all that just over looking something like gap size can cause all that trouble let's hope no one makes the same mistake like i did :club:
thanks for all your help regarding this matter :bow: :bow: jedi020 nc30novice
wrigglytin
26-08-2005, 11:52
Plug gap size?! Well they say always check out the simplest first!
A bit like me spending 45 mins on the phone with a customer trying to get her pc to come back to life, "was it plugged into the mains" i asked first "of course" she said.
After trying EVERYTHING it turned out it was only the modem cable that was plugged into a socket in the wall! Put 240v mains into it and strangely enough it all worked!!!
vBulletin® v3.7.3, Copyright ©2000-2013, Jelsoft Enterprises Ltd.