NC24 Engine NC30 Frame??

[Stuster]

Hi all,
Started a NC30 build later in 2011, been trying to source a NC30 engine for a good while in my price range with not much luck at all. Now s few people have said the NC24 will fit the frame but I will have to get the coils and ignition box. The loom too, now I now the crank in the NC24 is a 180 and the NC30 is 360 but the engines are both marked NC13, is this correct, if so would this suggest that they are pretty much the same engine apart from the above? Been offered a running NC24 engin for a good price, only reason I ask. Thanks in advance :-)
Stuart

[abrmoto]

Stuart, whats your budget for a NC30 motor, drop me a PM, work in leigh, if can sort a deal you wont have the headache of fitting NC24 motor, seams lot of work if you can just get a 30 motor.

[Neosophist]

The NC24 motor will indeed fit, theres a user on here that has one fitted.

You will need, ECU, coils (it has 4) and loom, not sure how well the rev-counter will work, might need a 24 one.

They are both NC13E engines you are correct, they share a common crankcase set.

There is a whole lot of difference internally.

The NC30 fires 360, different crank, totally different top-end (valvetrain system) pistons are different too, as well is the gear-box.. the NC30 has that notoriously tall 1st gear.

Here's a brief summary of pro's and con's of the 24 engine

NC24 motor will take more effort to fit.

However, both make 59ps as stock from Honda.

Many Japanese racers have the 24 engine as they say it's easier to work with.

The NC24 engine uses standard size 10mm bike plugs.. you can get them cheaper and in a wider variety of choices (if tuning / fettling is your choice) with the 30 your stuck with expensive er9-eh or the racing equalivalent.

The NC24 comes with a radiator oil cooler as standard.

The NC24 doesn't have such a long first gear. (it does use 15/45 stock gearing as opposed to 15/40 so you might want to think about your rear sprocket if you fit it.. should be fun with 15/40)

The NC24 has lock-nut adjusters for the valve clearnaces.. this means you don't have to buy any shims when adjusting valve clearances.

I like the 180 firing order.. it's similar to the NC30 sound but more on par with a VFR750/800.

Carbs from the NC30 will fit fine, stock 24 uses 115 jets all around.. NC24 carbs work slightly different to the 30 carbs in terms of air-setup etc.. the power is a little 'rougher delivered' but still the same. (pretty much the same with any bike model.. as they progress they are refined to make them smoother).

Since there both NC13E based, there practically bullet-proof unless majorly abused.

The NC24 has a different exhaust system, an ideal system would be the HRC, it's split left to right as opposed to front and back (due to firing order differences) but the stock 30 system will bolt on and shouldn't be too unkind to your engine.

Can't think of the other member on here with the bike you'll have to have a word with him.. was like it when he borught it though, he didn't do it.

Loom will mostly fit fine, some things like the ECU position are in a similar place on the NC24 to NC30 but the coils, as there are 4 you'll have to maybe make a bracket / cable tie to put them in position.

If you decide to do it and need any help feel free to ask more quesitons, i'll try my best.

The cheapest I saw a good running NC24 motor was 19.99 on ebay :D

[CRM]

and the 24 has thicker bores - so could be bored out further for a large CC motor

[Stuster]

Hi Guys, thanks very much for your advice. I will be picing the engine up this weekend and will post a thread on my progress as time goes on. Thanks again for your help :-)
Regards Stuart

[Neosophist]

Here's one I found eariler

Anyhow.

Do you already have a knackered NC30 engine to take parts from?

What carbs are you going to be using?

While it's out of a frame check valve clearnances first.

Inlet: 0.11 - 0.15
Outlet: 0.18 - 0.22

Couple of things (only minor) come to mind.

The NC30 gets it's speedo drive from the front sprocket, the NC24 from the front wheel.. easiest solution is to fit the NC30 front sprocket cover with speedo drive, not sure how much the speedo will be out if you don't use a 45 rear sprocket (it'll acellerate fast with a 40T NC30 sprocket though!)

You might also need the NC30 clutch rod, but i'm not sure having never tried it.. this might be becuase the NC30 inner clutch is different.. you could I think transplant the NC30 clutch into the NC24 should you wish (you'd really need the pushrod then) as it's the same clutch basket.

If you don't have an engine yet then i'd try the sprocket cover first and see if it will actuate the clutch.

http://www.ebay.co.uk/itm/HONDA-NC-30-V ... 3a6d274c1e

Like this.. 10gbp deliverd including speedo drive if you dont' have one.. i've searched for clutch rod and they arn't expesnvie either should you need it.

The NC24 front sprocket attaches via two bolts rather than one you might need a little bit of fettling to get the speedo drive to read the sprocket but it won't be a major headache.

NC24 uses C8EH-9's as standard, a lot of people fit the CR8EH-9's (reistor plugs) as they are 2gbp instead of 6gbp.. and don't seem to suffer any loss of performance.

[Stuster]

Thanks for the pic, i feel much better knowing it can be done.

I dont have a NC30 engine no, so looks like i will be buying the NC30 cover, as for the engine I have just got, its a runner and in really good condition.

As for the carbs .... I was thinking of just useing the NC30 carb with standard jets, is this ok to do?

So if I use the 40t sprocket will the bike loose any top end speed? Before the engine goes back into the bike I will be sending it to a friend of a friends garage to have it looked at properly, Valve clearences done and might even invest in a full gasget set while its out. For what the engine cost I may aswell as i will still be in pocket. Also will be giving it a good clean up (paint).

I will soon be adding a new thread on my build. Its a nut and bolt build that will probably take me a good while. I did put this on another forum but may aswell start it again on here seeing as its Honda...

Thanks again for your help guys

[Neosophist]

Thanks for the pic, i feel much better knowing it can be done.

I dont have a NC30 engine no, so looks like i will be buying the NC30 cover, as for the engine I have just got, its a runner and in really good condition.

As for the carbs .... I was thinking of just useing the NC30 carb with standard jets, is this ok to do?

So if I use the 40t sprocket will the bike loose any top end speed? Before the engine goes back into the bike I will be sending it to a friend of a friends garage to have it looked at properly, Valve clearences done and might even invest in a full gasget set while its out. For what the engine cost I may aswell as i will still be in pocket. Also will be giving it a good clean up (paint).

I will soon be adding a new thread on my build. Its a nut and bolt build that will probably take me a good while. I did put this on another forum but may aswell start it again on here seeing as its Honda...

Thanks again for your help guys

total waste of money to replace gaskets unelss they are gone.. the head-gaskets are bulletproof. :) and yes maybe... ill calculate later.. top end isn't too much to worry about on these motors anyway.

Perhaps a 16T front.. will work it out anyway and post back some 'theoreticals'

[Stuster]

Thanks for the reply mate, Yeah a few people have told me not to bother, The engine i was told is quiet high mileage but as started been well looked after and not abused. My thread on here is NC30 Nut and bolt build. |Found my camera so will add a few sneak peeks later on.

Stu

[Tim400GB]

(it'll acellerate fast with a 40T NC30 sprocket though!)

Other way around isn't it?

putting a 40T on a nc24 you'd lose acceleration