Honda NC30 misfiring

**crazy man** · 29th July 2011, 20:54

Originally Posted by racefactory

Hard to find is the answer to that. They are on the inlet manifolds. If you don't have the haynes manual to show you where then best thing is to take the carbs off and then locate them. You are wanting to balance the carbs right? The method of least hassle is the 'drill bit under throttle butterfly' method rather than using vacuum gauge. Search on 400greybike.com and you will find it. Yields good results.

have you still got some carbs forsale? got a flat spot at 8-1100 rpm the rest runs very good. l dont think the needles are standard but someone nice on here is sending part of a kit that may help me {-:

**crazy man** · 29th July 2011, 20:58

Originally Posted by ducatilover

Only problem there is it's not as accurate. The reason for balancing is to get the vacuum the same, as we know. There will be variances in valve clearances, carbon build up (Some bikes do it on the left hand cylinders when warmed up on the center stand and the floats are off) so you're not balancing them to how the engine needs them done.
If my rambling makes sense?

I've used that method before and the verniers method and have found that the only way to get it spot on is with a decent set of gauges.

I'm sure the NC30 are uber sensitive to balancing too aren't they?

is there not a screw on the carb that you are meant to have 2 1/4 to 2 1/2 turns out? had the carbs of could not find it for the love of me. l found a pic of some nc35 carbs and they stand out easy

**ducatilover** · 29th July 2011, 22:24

Originally Posted by crazy man

is there not a screw on the carb that you are meant to have 2 1/4 to 2 1/2 turns out? had the carbs of could not find it for the love of me. l found a pic of some nc35 carbs and they stand out easy

Can you post a pic of your carbs?
You might have the pilot screws blanked off, you can drill the cap off them very carefully.
They will be on the engine/head side of the carb, on the bottom and should be recessed into the carb body.

Click image for larger version.

Name: zzr carbs.jpg
Views: 26
Size: 766.6 KB
ID: 243672

You can see on these ZZR400 carbs, the carb on the left has the pilot screw (Bottom of the bowl, slightly to the right) and the one on the right has had epic damage and the oart the screw is recessed in has departed the carb body...

**racefactory** · 29th July 2011, 23:02

Originally Posted by crazy man

is there not a screw on the carb that you are meant to have 2 1/4 to 2 1/2 turns out? had the carbs of could not find it for the love of me. l found a pic of some nc35 carbs and they stand out easy

Yeah the NC30 pilot screw looks pretty much the same as the picture ducatilover posted. It won't fix your problems though, that will only effect your idle and starting.

I don't have any carbs. Contact vtec or icemaestro on here- I think they have carbs that they might be willing to let go of.

**crazy man** · 30th July 2011, 08:40

cheers guys will pull them of and post a pic if l still cant find them but sounds like they wont fix my promblem . need to find my LambaLink

**crazy man** · 2nd August 2011, 08:16

l may of sorted it going alot better with no guts in the airbox! even just the gorse in the airbox kills it? strange 90% there maybe just some bigger main jets

**ducatilover** · 2nd August 2011, 11:03

Originally Posted by crazy man

l may of sorted it going alot better with no guts in the airbox! even just the gorse in the airbox kills it? strange 90% there maybe just some bigger main jets

It might be running far too rich.
Does it pull right up the top?

**crazy man** · 2nd August 2011, 15:45

Originally Posted by ducatilover

It might be running far too rich.
Does it pull right up the top?

yes it does. l tryed it a week ago and did fix that 8 to 11000 rpm promblem but felt very lean up top now with some 128 jets in it its fine. going to try some new needles when they turn up as well

**ducatilover** · 2nd August 2011, 15:47

Once you get it a bit smoother, slap it on a dyno and see what's going.
Sounds like you're making progress though.

**Icemaestro** · 2nd August 2011, 16:26

Wow, 128 jets, goodness! and I thought my 122's were extreme!:-P. My spare set of carbs are gone sorry mate, to drunkenmistake. Like I said though, AJ has several, just give him a call, his prices are reasonably reasonable, it all goes to his VFR fund! Other than that, there are a couple of sets on ebay.co.uk that you might be able to get shipped over here - there are 4 sets on there at the moment for 65-105 pounds, the cheap one says they'll post worldwide too...

**crazy man** · 2nd August 2011, 17:06

lucky l got rid of my drunk post

**crazy man** · 2nd August 2011, 17:41

Originally Posted by Icemaestro

Wow, 128 jets, goodness! and I thought my 122's were extreme!:-P. My spare set of carbs are gone sorry mate, to drunkenmistake. Like I said though, AJ has several, just give him a call, his prices are reasonably reasonable, it all goes to his VFR fund! Other than that, there are a couple of sets on ebay.co.uk that you might be able to get shipped over here - there are 4 sets on there at the moment for 65-105 pounds, the cheap one says they'll post worldwide too...

what do you run in the way of a air box?do you race ?

**Icemaestro** · 2nd August 2011, 19:39

Me? Race? nooo haha haven't even pushed the limits of my nc30! got more peg down on RF's rvf! My nc30 was a track bike before me though, it's been put back on the road and I've been slowely trying to get it back to stock

Currently has normal airbox and snorkel, though with the ribs cut out of it, and missing the flap/top part of the air scoop. oh and a k&n filter on the rear cylinder