Nb16 Problems

[mucasiola]

Hey guys,

This is officially my first nitro car. I picked up the NB16 off ebay for £75 with delivery which I think was a good deal. The owner claimed it had just been ran in. I will number my questions just so it's clearer to people why I am writing this thread and if they don't actually care about the story

Anyway, I get it - realise it needs a new rear shock, so I have just ordered one and it's on its way. It needed a damned good clean so I took it apart and gave it a good detail clean which took me 2 or so hours (lots of tiny spaces of trapped dirt).

So I take it out for it's first run and it starts ok, but when I go to put any throttle on it cuts out... I have to leave it for a bit and slowly build up the speed and eventually it lets me accelerate quicker and quicker. Until it can speed up pretty much right away but sometimes when going from braking to full speed will still cause it to stall.

1. Anyone any ideas why this happens?

Anyway, so on this first run it suddenly makes a high pitched nosie and no matter how many revs I give it the wheels have no power. So I take it home and notice that the spur gear (think it's called that. It's the plastic one which attatches to the main metal one from the engine, circled in pic) has all it's teeth chipped off.



I had a look for what I assume is the cause of the problem and I found the engine block was loosely connected to it's housing, meaning it moved and probably caused it to chip the gear's teeth. So I tightened it down and bought a new spur gear.

2. I was just wondering if you guys think this was the cause of the problem, or is it worse than I think? Is it worth putting another gear in to be chewed up again?

Anyway, when giving it the initial run. I noticed it was no way near as nippy as videos I have seen of the nb16 on youtube. So I am assuming this guy didn't tune it after running it in.

3. So can anyone give me some advice to make it run better?

The person who sold it me also claimed he put a 2 speed gear box in it. But from listening to it there is no evidence of such a change.

4.Is the gear box in the picture a 2 speed? Do I have to do anything to set it up?

Also, lastly. The person who I got it from didn't have an instruction manual (hence me having no idea how to tune it etc. 5. So I wondered if anyone could find an online PDF of it...?

Thanks very much for reading,

I currently feel stupid. I thought I got a great bargain and have just been riddled with faults. I hope you guys can help me embrace my new mini monster

Mark

[maverick]

well mark it sounds like you've had a few problems you cant trust no one these days but one thing you can trust is us on here I notice you are the latest member to RC kingdom well a big welcome . I am no expert as I am still on a learning curve with nitro Rc's but I can ensure you will get the advise you need from the best bunch of blokes ever as they have help me a great deal already. sorry I can't help much but to get better performance out of your car it sounds like the engine needs a bloody good tuning also try adding hop-ups such as a race tuned exhust maybe looking at the fuel that your using thats as much as I can suggest but the other guys will help you more good luck in sorting it out.

P.S one of the members has there own online store called v-racing check it out at dirtyrc.co.uk the members name is Big-Mr-V

[maverick]

hey mark good news just done a bit of research check out nitrotek.co.uk they have nb16 spares hop-ups/upgrades and in the spares section is a instruction manual for less than a fiver.
hope this helps also use google it gonna be your next best friend as you can find pactically anything through google. again best of luck

[mucasiola]

Hey,

I noticed that but I really don't have the money to buy another atm. I am dead out of cash for a week or so but I'd like to fix this asap.

Anyone know how to replace the spur gear? I have no idea how to take the old one off... I might just go at it with a screwdriver and keep removing screws until it comes off.

Thanks

[maverick]

hi mark,

On the nitrotek site go to the right hand side of the main page the is a section there which has a bit that is titled help and advise go in there. unfortunately nothing on spur gears but there is other useful info such as how to tune your engine etc tried to google it for you but no luck sorry mate

[Dagger Thrasher]

Hi Mucasiola,

First off...welcome to RcK. Great to have you on board.

I can't answer all your questions as I don't have an NB16 myself, but some I'll try to help you with. In terms of the engine cutting out...that sounds like it's running too lean to me, but is nothing to worry about. You'll need to adjust the carburettor to allow more fuel into the mix. I'm no nitro head so I'm sure someone else can give you instructions on how dto do this, but it's just a matter of adjusting some needle-screws.

As for the spur...sounds like you're on the money there. The mesh was probably set too loose by the guy who previously owned it, and this can cause teeth to strip easily. You'll want to set the gear mesh so that the teeth are making good, solid contact without actually putting any pressure on each other. A good way to do this is to slide a strip of paper through the mesh; if it comes out heavily crinkled, but in one piece, then it's set about right.

The NB-16 has a slightly weird transmission layout, but it looks like you have to 2-speed installed. You might need to adjust the shifting set-screw in order to get it to shift into 2nd gear though. These 'boxes work on the principal of centrifugal force, and the adjustment screw sets preload (I think!), which allows you to set at exactly what RPM the shift occurs...but sometimes the screw is set wrong from the box. It'll be easier to adjust once you've gotten a manual, but you basically want to adjust it in small increments until it's shifting up just before the engine winds out fully. Best to wait until you have the manual for that, though.

I hope that helps some, anyway.

[mucasiola]

Thanks very much for the responses so far! You guys are great

So I guess I should just buy a manual for a guide to running in and how to take it apart.

I do, however, fear that because the NB16 comes fitted as standard with a 1 speed gear box (the 2 speed is a hop up the previous owner bought) that it won't explain how to dismantle this 2 speed one.Still, if anyone has any idea how to take the 2 speed gear box apart in order to get that spur gear off I would greatly appreciate it.

Currently I have an old electric RC car suspension shock fitted whilst I wait for the new ones. It looks pretty funny right now 

[mucasiola]

Hey!

I managed to fix the gear. Just took alot of screws and some pulling and fiddling. It runs now, but I still have the problem of it cutting out when I accelerate, and when I pinch my fuel line to kill the engine it just revs up and tries to take off...

Anyone know what's up?

[Danniuk]

use the instruction manual and set high speed needle and low speed needle back to the original settings, if it runs ok good, if not try to change the high speed needle and low speed till you get good, smooth acceleration with some smoke, if there's no smoke your running too lean, and if theres too much that its chucking out lots of blue smoke out put a little leaner.
(only turn the needles by tiny increasments).
And yeah it looks like you have two speed.

[jimbob]

best way to kill the engine is to block the exhaust 

[rc tenchy]

hello the gear box looks to be 2 speed new part number 30850 hope this helps
http://www.nitrotek.co.uk/products.php?cat=35

[smasherman]

well, due to scale nb16's are known to break easily and if i was you id go to the local hobbystore show it to them and ask what they can do

[Stumungous]

well, due to scale nb16's are known to break easily and if i was you id go to the local hobbystore show it to them and ask what they can do

All depends on your local model shop, mine would hold it at arms length, move it to one side and hand you the HPI or Traxxas catalogue.