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Henniebrandweer
Familiar Member
South Africa
215 Posts |
 Posted - 05/09/2007 : 00:27:47
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Hi there Guys,
I Finally baught my NC30, she pulls great, but there's definately something wrong with her , when she's idling(Nutral) then all seems fine, but when i pull in the Clutch and put in 1st gear then idling drops slowly and eventually she dies, and its not as if the clutch isnt pulled in all the way or not ajusted correct, it must be something else coz i even adjusted the clutch to catch late? another rhing, when im driving her high up into the revs, she sound like not getting enough fuel, stars missing slightly and not picking up speed, and if i keep the throttle in one place when on speed it feels like the bike is going back and forth(i dont know how else to explain it), as if not getting a constant fuel supply? i tried ajusting the idling a bit just so she wont die when im in first at a traffic light, but as soon as i tuch the idling screw, she starts missing?
Im going to take off the carbs tomorrow and clean the, and then ill check the jet sizes, because i baught her with a full system(exhaust on both sides) and dont know if the jetting has been done for those, please let me know what u think?
Here's a pic of the bike and exhausts:
Oh, and just incase anyone wonders, the bike rev's fine, all the way to the redline, only when i drive that this happens, also sometimes when i pull away, she misses for a second or 3 and then pulls again.
Any advice would be gr8 guys, 
Thanx
Hennie |
I put Wet stuff on the Red stuff!!! |
Edited by - Henniebrandweer on 07/09/2007 21:08:20 |
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Cammo
Forum Veteran
Australia
3023 Posts |
Posted - 05/09/2007 : 00:37:48
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Check the voltage at idle and at revs, a faulty charging system could also be to blame.
Could also be carb, airbox or fuelling issues.
Edit: Doesn't sound like a jetting issue to me if it's happening just off idle. |
I DUG the underground! |
Edited by - Cammo on 05/09/2007 00:39:09 |
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Henniebrandweer
Familiar Member
South Africa
215 Posts |
Posted - 05/09/2007 : 00:42:33
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| Thanx Cammo, will check that in the morning, what should the voltage be at idle? and at revs? and i just did the airfilter mod thats on the sit, so ill check when im driving home in the morning, but i got afeeling its something to do with fueling... can u please confirm for me, at the tap on the tank, offside, how many pipes are there supposed to be and where they supposed to go, coz there's 2 at the moment connected, and lools like one missing at the bottom side of the tap? |
I put Wet stuff on the Red stuff!!! |
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Cammo
Forum Veteran
Australia
3023 Posts |
Posted - 05/09/2007 : 00:46:40
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Sounds like it's had the HRC tap mod done if you only have 2. Do a search on this to find out about the dangers!
What's the air filter mod? Do you mean airbox or air filter?
The voltage should be over 13.5v at 5000 revs and up. If the voltage is too high it will boil the battery, pretty common with the '30's. |
I DUG the underground! |
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Cammo
Forum Veteran
Australia
3023 Posts |
Posted - 05/09/2007 : 00:50:32
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I think you have a couple of problems, which aren't related hennie.
If it's missing at low revs (i.e. pulling away), it will probably be either an electrical/charging issue, or pilot screws wrongly adjusted.
Because you says it revs fine at idle, but not under load, this would point to the induction system (airbox, filter) being messed around with in my view.
Get back to us with the induction mods you've done, and check the voltage. Has the bike always run like this??
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I DUG the underground! |
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Cammo
Forum Veteran
Australia
3023 Posts |
Posted - 05/09/2007 : 00:51:18
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| YES I'm quite bored here at work! |
I DUG the underground! |
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Henniebrandweer
Familiar Member
South Africa
215 Posts |
Posted - 05/09/2007 : 00:54:33
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| over or under 13.5v? and its the mod where u take the airfilter out and cut the paper part out and replace it with foam, did it already, and about the HRC mod, i read somewhere that , then when u take off the big pipe from tap(fuel pipe) and open the tap, the fuel isn't supposed to come out unless the smaller pire that goes down to the front of the engine is taken off aswell? but when i take off mine, the fuel flows out quickly, even when the small pipe is connected? |
I put Wet stuff on the Red stuff!!! |
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Henniebrandweer
Familiar Member
South Africa
215 Posts |
Posted - 05/09/2007 : 01:00:33
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| i dono if the bike always ran like this, ive only had it for a day and a half now,LOL, and i did notice that it seems like one of the previous owners drilled holes in the airbox on the side to the front-left, but for some reason closed them up again with duck-tape, so i dono what has been done to this bike, and the pulling away thing, it doesnt miss if i put it in nutral be4 i stop and then pull away, only when i hold in the clutch, and use the accelerator to keep it alive at the traffic light, then when i pull away she misses for a couple of seconds? |
I put Wet stuff on the Red stuff!!! |
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Henniebrandweer
Familiar Member
South Africa
215 Posts |
Posted - 05/09/2007 : 01:43:19
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| Anyone? any sugestions? |
I put Wet stuff on the Red stuff!!! |
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JonRA23
Familiar Member
Australia
382 Posts |
Posted - 05/09/2007 : 02:19:56
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Hi Hennie
Congrats on the buy. Not many answers but a few questions.
If fuel runs out of the fuel tap without applying vacuum to the small hose the HRC fuel tap mod has been done, mine was done when i bought it and have set it back to standard as it occasionaly dumped a heap of fuel throught the carbies into the engine and then sump. Needle and seats in carbies should not let this happen but even though it had new needle and seats in it it would happen occasionaly.
Did the bike show the surging symptons at revs before you replaced the paper air cleaner with the foam element?
Did you use proper air filter foam for the airfilter mod?
Does the Airbox have a rubber bellmouth looking thing on the front of it?, the NC30's are pretty touchy on any mods to the airbox without being rejetted to suit.
Do you have a workshop manual and parts list? Both can be found on Mlohmeyer's site at http://www.akhara.com
regards
jon |
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Henniebrandweer
Familiar Member
South Africa
215 Posts |
Posted - 05/09/2007 : 02:31:52
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Thanx for reply Jon,
Yes it has the rubber bellmouth looking thing, and yes it did show the surging symptoms before, infact, i havent ridden after modding the airfilter, only did it tonight, and still at work ,will see tomorrow morning when i go home if any difference, but did notice it still misses when it idles and i touch the accelerator slightly, and yes, the foam that i used is used by a carburator shop where i live, so i hope its the right stuff, but its pink, and not black??
and lastly, yes, do have a couple of manuals, but not sure if its all i need.
Thanx |
I put Wet stuff on the Red stuff!!! |
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Cammo
Forum Veteran
Australia
3023 Posts |
Posted - 05/09/2007 : 02:39:20
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I would return the air filter back to a stock paper element to get rid of any variable when this type of problem pops up.
At the least, the main jet size will need to be changed to suit the foam air filter you've put in, it will run worse up top without jetting it and putting a foam filter in.
Your airbox sounds suspect in that it has been drilled in the past, makes you wonder what else was changed. Airbox changes can be entirely responsible for your running problems, as anyone who has modified them can tell you!
The battery should be putting out at least 13.5v at mid revs, over 15.5v and you have a problem. |
I DUG the underground! |
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Henniebrandweer
Familiar Member
South Africa
215 Posts |
Posted - 05/09/2007 : 02:46:27
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i think the foam filter mod that i did would definately be better that the old one that were in there, coz it was extremely dirty and almost black from all the dirt and dust, even got sand out of there, so lets see what it does in the morning when i go home, but as i said, it definetely does still miss,
just one other ting, is there any way to adjust the chain tention without that tool thing that they show in the manual? |
I put Wet stuff on the Red stuff!!! |
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alivee4
Senior Member
Australia
1097 Posts |
Posted - 05/09/2007 : 06:07:36
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quote:
Originally posted by Henniebrandweer
just one other ting, is there any way to adjust the chain tention without that tool thing that they show in the manual?
Yep, you can use a drift and hammer, but proceed with caution or you'll bugger it. |
NC30 track bike on a carbon fibre diet |
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Hannes
Settled In Member
South Africa
135 Posts |
Posted - 05/09/2007 : 14:58:00
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Use a rubber mallet. I broke one of my teeth on adjusting the tension.
Sorry about the bike Hennie. I was really hoping that the bike was in good condition. That is why I always persist to take a bike on a long run when testing it! |
I live one quatermile at a time! |
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nakes
Regular Member
South Africa
563 Posts |
Posted - 05/09/2007 : 15:55:15
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If you can, undo the fuel tap mod... I had problems when I did the mod; the diaphragm came loose and occasionally blocked the fuel from flowing freely out the tap.
Try to seal up that hole in the airbox with some QBond and a piece of rigid plastic... or maybe even just Qbond and the powder that comes with it..
I had a similar problem as you when pulling away... I changed the jets and adjusted the pilot screw... It reduced the problem a bit until I changed the Can.. now it pulls away without a splutter...
Also, If you have the fuel tap mod and intend keeping it then you need to remove the thin pipe that runs to the fuel tap and turn a screw into he side of the cylinder where the pipe leads to...
If you undo the the fuel tap mod then you need to be sure that your Vacuum hose (the thin one that leads to the fuel tap) isn't constricting when there is a load at high revs or when pulling away...
I don't think your problem is major... sounds like a fueling issue...
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http://www.hondarvf.com - A community driven workshop guide... |
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Henniebrandweer
Familiar Member
South Africa
215 Posts |
Posted - 05/09/2007 : 19:30:23
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ok, but can u please explain to me where veryting is supposed to be if i want to undo the tap mod? im not sure about it.
Where in SA are u Nakes? maybe i can make a turn by u, i mean u know better than me? |
I put Wet stuff on the Red stuff!!! |
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nakes
Regular Member
South Africa
563 Posts |
Posted - 05/09/2007 : 20:25:31
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I'm in Cape Town...
To undo the tap mod you need to undo what's been done here: http://www.akhara.com/nc30/fueltapmod/index.html
If you don't have the spring and diaphragm that's been removed then you won't be able to undo the mod tho... maybe It would be a good idea to check that the tap internals are still in tact and functioning as it should...
I wouldn't say I know better... I just came across the problems and info before you...*S* |
http://www.hondarvf.com - A community driven workshop guide... |
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Henniebrandweer
Familiar Member
South Africa
215 Posts |
Posted - 05/09/2007 : 22:12:05
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OK Guys, i think i found the problem! Hope im right, when i took off the carbs, i noticed that there's suppose to be 2 pipes that connects from the carbs to the airbox at the back of the airbox next to each other, but on mine, ONE OF THOSE PIPES ARE TOTALLY MISSING! the one that goes to the rear carbs i think, here are some pics:
sorry for the bad quality, but only got my mobile with me, so there's one definate problem,
the other problem is that when i cleaned the carbs, i noticed that all 4 carb's jets are exactly the same, and according to other topics i read, the front and rear carbs is supposed to differ??
jets as follows:
big one's : 115
the long looking ones : has 35 on them
and the place where the float needle goes in has a 26 on them,
all carb exactly the same!
one last thing, when i lifted the carbd up when i took them out, i found 2 screws and some thingy on the engine beneith the carbs, heres a pic:
can anyone please tell me where this goes and what could be the reason for it being there be? im sure it couldn't have been me, for i never heard anything fall and didnt loosten anything that i shouldnt have.
thanx guys
Hennie
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I put Wet stuff on the Red stuff!!! |
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Henniebrandweer
Familiar Member
South Africa
215 Posts |
Posted - 05/09/2007 : 22:51:00
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Oh and another thing, i did check the charge rate, its 13.9v at idle, and goes down to 12.9v when i rev it, so it seems ok, but a different Rectifier has deffinately been installed, because i know what the original one looks like and the one i have on is much bigger and has some wires cut off and taped closed.
About the jets, what size would u guys recommend for the Exhaust system i've got fitted if u look at the pic in first post? and do u think that Vehicle carburator workshops would perhaps have these jets, for they look simular to car jets, and one of the bike workshops that i phoned said i should try at the carb shops, he sometimes gets jets for some bikes there?
Please let me know what u think?
Thanx |
I put Wet stuff on the Red stuff!!! |
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Cammo
Forum Veteran
Australia
3023 Posts |
Posted - 05/09/2007 : 23:06:52
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The missing pipes aren't critical to runnnig, just pollution gear.
Your voltage is too low, I would be suspicious of that firstly. A different reg/rec doesn't mean much, these bikes can eat them up for breakfast if the rest of the system/wiring isn't tip top!
Typically, 118 (front) and 120 (rear) jets would suit your setup if you were using the standrad filter, but you'll need to go higher if you intend to use the foam filter, hard to tell without knowing whatr sort of foam it is (HRC, pipercross, etc).
Edit: With these bikes you really need to jet to suit the induction mods (such as your foam filter), regardless of exhaust setup.
While you have your carbs off, it's a great time to do a balance (do a search for 'drill bit'), and also to raise the jet needles using an extra 0.5mm washer, this will help midrange performance, and is essential in my opinion if you have a good flowing exhaust system such as yours.
Sounds like you're getting close to the source of your troubles.
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I DUG the underground! |
Edited by - Cammo on 05/09/2007 23:10:14 |
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Topic |
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NC30 MISSING AND LOSING SPEED? Not anymore!!!!!
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