NT carb upgrade

graydog8josh

Member
Nov 23, 2012
448
3
18
Starkville,MS
Im looking to get a bigger carb, but something that i can use the same jets as the NT carb. Does anyone have any recommendations? Im looking on treatland but there's so much stuff i cant figure out what will be the smoothest transistion. I just want to be able to flow more fuel and air in.
 

Venice Motor Bikes

Custom Builder / Dealer/Los Angeles
Mar 20, 2008
6,750
664
113
Los Angeles, CA.
There's not really a good 'performance' upgrade for the NT carb, (unless you're on the track).
Most of the fastest bikes I've ever seen use NT carbs that have been re-jetted. ;)

*edit*... The RT carb has a real smooth 'mid range', but the RT carb still needs to be re-jetted for a HT engine.
'Top speed' is about the same with both carbs.
 
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Wickedest1

Member
Oct 31, 2012
687
6
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39
connecticut
ok so my question on this is since u say there is no "upgrade" carb so to say, then where can the everyday joe buy the jets for the stock nt carb?
 

biknut

Well-Known Member
Sep 28, 2010
6,540
241
63
Dallas
I'm surprised no one mentioned a Speed carb. It's 2mm bigger than a NT and 1mm bigger than a RT.

I consider it an upgrade to a NT. By itself it doesn't give you any more top speed, but it has a much better idle, and should have the potential for more power. It uses the same jets as a NT. Another good thing about it is unlike a RT, it uses the same throttle cable.
I have one on all my china girls mainly because of the rock solid idle.

http://www.ebay.com/itm/181052658109?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1438.l2649
 

Wickedest1

Member
Oct 31, 2012
687
6
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39
connecticut
Speed carb...hmmm...I've seen them fire like 12$ shipped...mighty glad you told me they use the same throttle cable...buddy ordered the rse reeds and speed carb...might be next in line depending upon his findings
 

bairdco

a guy who makes cool bikes
Aug 18, 2009
6,549
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living the dream in southern california
NT speed carb is great, except the extra fuel shut-off is prone to leakage.

i've drilled through the banjo for a straight fuel flow, removed the shut off lever and gasket, an capped it off with a homade gasket and small aluminum plate.
 

Kioshk

Active Member
Oct 21, 2012
1,152
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Connecticut
Baird's right; my love of the NT Speed erased my memories of the heartache she gave me early on. That damned banjo-bolt connection can really ruin your day if the gaskets get worn-out or pinched...results in an unstoppable drizzle of fuel. Mind you, I was in the middle of parting out the engine, so I was frequently removing the carb (and that banjo) for access to the rest of the engine. I ended up buying another whole NT Speed ($17 delivered offa eBay) and made sure to tighten down that bolt ONCE, and ONLY once. Haven't had a problem since. In fact, I haven't needed to use the cut-off at all.