ALLright.

got my carbs off at the weekend, after ofcourse unloosning all body work, tank, airbox, throttle/idle/choke cables.

i feel like ive accomplished alot and discovered some problems which could be leading to my top rev range problems.

anyways, as i was stripping and lablelling piping for the carbs i knoticed on the plastic connector pipes (the ones for the two air lines, which clip in the middle of both carbs) have little rubber seals/clamps which seal the holes (i assume) and stop air leaks? well anyway there buggered, i didnt even have to pull em off, the fell off when i moved the plastic connector pipes..Damn! they were all pershed and broken.

right, now im stripping the carbs one at a time in accordance with british standard haynes manual.. and have drained the fuel and looked at the first front left carb (the one with throttle cable fastening attached) anyway, this one all seems in good nick, very clean in fact. nothing broken, diaphragm in good shape and so are all needles. thing i wanted to check however are two screws i have (main and idle) i think ones idle however sure one is main. The main has 122 on it, i take it this is jet size? the other 35...? im confused, and need to consult you guys before i go further!

anyways if rick oliver see's this post would he be able to pm me with a price for new seals for the float chambers? i need 4 :)

Oh and whilst i was at it, i cleaned my bike religiously, top to bottom, everything, plastics to metal and then in the wheels with a tooth brush etc. exhaust now looks new after a good wash and a generous spat of autosol!

plastics and tank also got a good going over back and front with autoglym shampoo and resin wax polish ofcourse after being chamois'd!

cheers lads, pics to follow! =D

Good arrows lad.

Yeah, the two screws are your jets - pilot jet and main jet.

35 is std for the pilot but 122 is big for the mains unless you run a full system and have some airbox mods.

Depends what is in the rest of them really...

the actual air screw is on the side of the carb body - it is a flat head screw.

yeah im running full micron system cms :)

this is the front carb so back should be even bigger yeah? (jet i mean)

im assuming so! oh, and if my main jets bigger should my other 35 size one be too?

so, do you reckon that could be a problem those broken rubber seals on the air intake of the carbs leading from pipes from airbox?

seems to me like it would lose pressure as there leaking air, meaning less air and fueling problems?

oh and where are my emulsion tubes? wanna check them too. cheers :)

Emulsion tubes are what your main jet screws into..

not sure which pipes you are on about for air - can you get a pic?

My bike is completely factory standard and Im running perfectly on 118F/120R Jets. It sounds like 122F/124R should be what you are running, and that sounds about right with an aftermarket exhaust. The pilot jets wont need changing, they only control how it idles and theres no Vacuum as such in the carbs on idle to alter the settings of them.
Check your spark plugs. If they are looking dry but just a little bit black, then try putting 124F/126R Main jets in and see if that helps. it should smooth out the power curve for you. If they are looking dry and clean then your jetting is probably right.

With the pipes you are on about. I am assuming it is the Vacuum hoses that have the very thin sleeve covering the joint to the carbs. No doubt the sleeve has cracked and split and this can very easily cause these pipes to leak air or take air in, and that affects the Vacuum and can make a small amount of difference to the low speed running of the bike. I changed these little sleeves on mine as they were cracked, an small bit of 10mm ID Re-inforced hose off ebay and I covered the joints with those instead.
Same as this stuff: http://cgi.ebay.co.uk/FUEL-HOSE-PIPE-FO ... 1|294%3A50" onclick="window.open(this.href);return false; Absolutely perfect for the job.
They are a really tight fit so seal very well and also help hold the pipes in place if youve had the carbs apart from each other.

thanks for this hamster great link, ill get some ordered later. im assuming i cut them into strips to seal the unit to the carbs properly?


ill check my plugs aswell and if there dusty maybe it is running lean, so a switch of main jets should sort this out :)

ill post some pics later/tomorrow when i have time! works frantic at the mo, but ill keep ya updated best i can :)

cheers lads

Yeah you will need about 10cm MAX of that 10mm ID Hose and you then cut it carefully with a very sharp knife into about 9mm Long sections and use these instead of those crappy honda standard seals. Be prepared for a bit of struggling though, its tough to ge tthem on properly, but once theyre on they work really well.

Hope you get to enjoy it again soon.

All the best

so guys, emulsion tubes/pipes

3 holes front cylinders 4 holes rear??

cheers.

Yeah mate, the richer ones go in the rear carbs. If you have standard needles, then J51A should be in the rear, J51B in the front.

Give the pilot jets and emulsion tubes a thorough clean, the small holes can block up very easily with fuel residue.

Good work on getting it done!

Yeah fear was the residual factor in not starting them, but, with help from you guys and my trusty haynes manual of lies, I'm growing in confidence AND becoming much more familier with the intricacy of the beautifully built nc30! (not too familiar mind, I'm not a machineophile!!)

Ill have to leave it till I get some new gasket rubbers for the float bowl covers now..rick Oliver may have them??

Ill keep you guys posted any how!

Cheers me dears! =D