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RickOliver
Qualified 'Zimmer' user
United Kingdom
3045 Posts |
 Posted - 05/09/2007 : 23:12:21
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OK -
The missing pipework is the vent pipes which let air in under the diaphragms as they rise - it will run OK without, but the plumbing feeds filtered air from the little sub element on the back of the main filter box and thus keeps the crap out of the carb innards so best to replace it.
115s all round is not stock jetting for any NC30 - I`m guessing maybe it`s an `89 bike which has been jetted up from 110s all round for those pipes but it needs to be richer - try 120s or 122s (might need less if you`re at altitude)
Your pilot jets are stock and should be OK.
The bracket and the small screw are what holds the outer choke cable to the mounting on the front of the carbs, the bigger screw could be several things, but if it`s the blanking screw from one of your vacuum gauge take offs that might explain the odd low speed running?
You may well have a charging problem - a healthy reg/rec will normally put out around 14.2 volts @ 5,500 rpm and not vary by more than about 1v from tickover on up.
I can supply main jets and I might be able to find you your missing pipework as well... |
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RickOliver
Qualified 'Zimmer' user
United Kingdom
3045 Posts |
Posted - 05/09/2007 : 23:14:31
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| Pretty good psychic connection half way round the world eh, Cammo...? |
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Cammo
Forum Veteran
Australia
3023 Posts |
Posted - 05/09/2007 : 23:21:16
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Haha, yes mate.
Sounds as though the misfiring probs are charge related to me... |
I DUG the underground! |
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Henniebrandweer
Familiar Member
South Africa
215 Posts |
Posted - 05/09/2007 : 23:26:02
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quote:
Originally posted by RickOliver
OK -
The bracket and the small screw are what holds the outer choke cable to the mounting on the front of the carbs, the bigger screw could be several things, but if it`s the blanking screw from one of your vacuum gauge take offs that might explain the odd low speed running?
Are you talking about the thin pipe that goes from the side of the tap to the cylinder? should the screw be in the cylinder or in the Pipe? coz when i took off the carbs, i saw that the pipe is still connected to the head somewhere and i sucked on it and it doesnt leak(it seals), and i was correctly connected to the tap aswell, only pipe thats missing from the tap is the bottom one?
quote:
Originally posted by RickOliver
OK -
You may well have a charging problem - a healthy reg/rec will normally put out around 14.2 volts @ 5,500 rpm and not vary by more than about 1v from tickover on up.
What would this cause to happen, i mean, how do i know that this is givving any problems? the battery still charges, so can this be that bad? can it affect the way the bike runs? high revs, low revs?
thanx for the reply |
I put Wet stuff on the Red stuff!!! |
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Cammo
Forum Veteran
Australia
3023 Posts |
Posted - 05/09/2007 : 23:51:06
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quote:
Originally posted by Henniebrandweer
the battery still charges, so can this be that bad? can it affect the way the bike runs? high revs, low revs?
When this has happened to me, the spark will be erratic and break down, the voltage output isn't enough to provide a strong spark, revs can break down at any point in the range. Maybe get a voltage reading at a steady 5000 revs and 10,000 revs to be sure.
It certainly can be responsible for symptoms such as yours, and does sound exactly what usually happens. |
I DUG the underground! |
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Henniebrandweer
Familiar Member
South Africa
215 Posts |
Posted - 06/09/2007 : 00:11:30
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| but when i rev the bike it revs all the way through, only when i ride hard, about 5th and 6th gear, it starts doing in in the high revs, but when i slow down so the revs go lower, and then suddenly open the throttle agai, it goes fine, but only for a while again? |
I put Wet stuff on the Red stuff!!! |
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Henniebrandweer
Familiar Member
South Africa
215 Posts |
Posted - 06/09/2007 : 00:25:21
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quote:
Originally posted by Cammo
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
one thing im worried about aslo is if i do the slide drill thing, i read that some people talk about 2 holes and others about 1, can u please explain it a bit more to me, is there a way to reverse the mod if it doesnt seem to work for me, because some people said that for them it didnt work? so should i drill the 2.5mm hole, or do i drill another hole next to it to be able to close it if it doesnt work, and what size? |
I put Wet stuff on the Red stuff!!! |
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Cammo
Forum Veteran
Australia
3023 Posts |
Posted - 06/09/2007 : 00:42:57
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The 2 hole slides are HRC slides and come like that, very hard to find now.
You can replicate the effect by drilling the 1 hole in the standard slide out bigger to 2.5 mm. Once it's done you're pretty much stuck with it.
Make sure the pilot screws on the carbs are properly adjusted too, this will affect the fuelling just off idle, they should be 2 1/4 turns out from fully closed. |
I DUG the underground! |
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Cammo
Forum Veteran
Australia
3023 Posts |
Posted - 06/09/2007 : 00:45:38
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quote:
Originally posted by Henniebrandweer
but when i rev the bike it revs all the way through, only when i ride hard, about 5th and 6th gear, it starts doing in in the high revs, but when i slow down so the revs go lower, and then suddenly open the throttle agai, it goes fine, but only for a while again?
This is a bit different to your initial description hennie! This sounds more like airbox/ air filter mods causing it, the bike running very lean up top.
If so, the foam filter you've put in will make it worse. Get some bigger jets in there asap, the bike will never run right on 115's. |
I DUG the underground! |
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Henniebrandweer
Familiar Member
South Africa
215 Posts |
Posted - 06/09/2007 : 00:50:43
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Oh my goodness, wich ones are the pilot screws? and would it be ok if i just turn them all out 2 1/4 turns even if our fuel differs from yours?
im not doing th drilling thing then, ill rty the washers, but do u know where i can get hold of a haynes manualto do the carb balance? ive searched for drill bit, but couldnt find anything? i would really want to do the ballance thing |
I put Wet stuff on the Red stuff!!! |
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Henniebrandweer
Familiar Member
South Africa
215 Posts |
Posted - 06/09/2007 : 01:00:15
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im trying to explain it best i can, when the bike idles in nutral its fine, but as soon as i put it in gear the revs slowly goes down and the bike dies, but when i drive, its fine, even revs fine, untill i reach high revs(i'd say 9,10,11 mark) in high gears, it starts missing then i have 2 let go of the throttle a bit, so when the revs go down and i suddenly open the throttle, she goes again, i dont know how to explain it better, im struggling enough to type in english, lol,
oh and i dont think i mentioned this, while i was cleaning the carbs tonight, i checked all the jets by looking through them into a light to see if they were open, and one of the pilot jets were not open, so i sprayed it through with carb cleaner, dont know if this could be part of the problem? |
I put Wet stuff on the Red stuff!!! |
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Cammo
Forum Veteran
Australia
3023 Posts |
Posted - 06/09/2007 : 01:02:18
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Try ebay uk for a manual, they're always on there. I have an electronic copy of the UK manual but can't send it from work atm, let me know if you want a copy later. The haynes is the better of the 2 I reckon.
Best to sort out the carbs all in one hit while they're off, nothing is very difficult but you really do need a manual. Ya, the pilot screw setting above will be fine where you are. |
I DUG the underground! |
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Cammo
Forum Veteran
Australia
3023 Posts |
Posted - 06/09/2007 : 01:03:37
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quote:
Originally posted by Henniebrandweer
i checked all the jets by looking through them into a light to see if they were open, and one of the pilot jets were not open, so i sprayed it through with carb cleaner, dont know if this could be part of the problem?
Yep that could be why it misfires when you turn the idle up. |
I DUG the underground! |
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Henniebrandweer
Familiar Member
South Africa
215 Posts |
Posted - 06/09/2007 : 01:19:28
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quote:
Originally posted by Cammo
I have an electronic copy of the UK manual but can't send it from work atm, let me know if you want a copy later.
I cant tel you how greatfull i would be, i would neel down before u, can u mail it to me? Proton(at)iburst.co.za
so what im going to do is the following, and please let me know what u think:
1) i cleaned the carbs and jets
2) going to put all back together and just have a quick test run to check what it does and if any difference.
3) if not better, im goint to drive all over town to find bigger jets, and try them.
4) if bigger jets has big improvement, then ill take off carbs again and do the balance and washers and see what happens.
or do u think i should do the balance before i even put it back together the first time? |
I put Wet stuff on the Red stuff!!! |
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nakes
Regular Member
South Africa
563 Posts |
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nakes
Regular Member
South Africa
563 Posts |
Posted - 06/09/2007 : 01:31:42
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You can get the jets from Rick Oliver... I bought my jets and needles from him a while back... price was good and only took about 10 days or so to get here....
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http://www.hondarvf.com - A community driven workshop guide... |
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nakes
Regular Member
South Africa
563 Posts |
Posted - 06/09/2007 : 01:34:30
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| I'm not sure what happens at high revs in a high gear when a bike is still restricted...but is it possible that that's a cause of your problem at high revs in 5th and 6th gear?? |
http://www.hondarvf.com - A community driven workshop guide... |
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Cammo
Forum Veteran
Australia
3023 Posts |
Posted - 06/09/2007 : 01:34:38
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Hennie, your plan sounds decent.
I wouldn't bother putting the carbs back on before jetting and balancing. It will NEVER run right with those jets!
Save yourself the time and just sort them out properly teh first time. I can imagine it would be frustrating since you just got the bike, but there is a chance you'll damage teh engine running it that lean. |
I DUG the underground! |
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Henniebrandweer
Familiar Member
South Africa
215 Posts |
Posted - 06/09/2007 : 01:38:50
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| Thanx Nakes, but that manual says you have 2 use tha vacume gauge tool to sync them, i read somewhere that u can do it wirk a drill bit while the carbs are off from the bike? |
I put Wet stuff on the Red stuff!!! |
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Henniebrandweer
Familiar Member
South Africa
215 Posts |
Posted - 06/09/2007 : 01:43:24
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| Thanx Cammo, so the jets are a definate thing, ok, ill try my best to get some tomorrow, ill take a chance at a automotive carb workshop, ill take the sample with, is the manual that u got the same as the one Nakes sent me? i dont have the gauges to do the balance, can i do it with the drill bit? |
I put Wet stuff on the Red stuff!!! |
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Topic |
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NC30 MISSING AND LOSING SPEED? Not anymore!!!!!
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