ThatsDax rt High Performance Carburetor

Well I have an irrational fear of freewheeling the clutch on steep hillls because I always think the chain is going to kink and I'm going to exit the ride as gracefully as in the video I just watched :-) Anyway, with the 41T sprocket on, seems like the bike is running way way better. I think it's because it gives my little china girl more resistance and she seems to like a little pushback. Have a fuel leak at the filter at the moment and I think I'll get another filter and install it upside down like I did the first time. That way the clear plastic bowl of the filter holds the fuel and not where the coffee colored plastic meets the clear plastic. What a dumb design. Gas loves a good seam to eat through.
 
If the gas is eating your fuel filter, maybe try a different brand. It could be ethanol in the gas, too. Briggs And Stratton makes a lot of little red button-shaped lawnmower filters that work for gravity fed tanks, are cheap, and hold up to deathanol.

Also, be sure it is not touching the engine or vibrating against the frame to cause cracks.

A10Z_1_20120725_13584695.jpg
The Briggs ones look like that and are marked for gravity fed carburetors/non fuel pump carbs.
 
I'm actually running 100% gasoline. And by the way, it has greatly reduced hesitation though maybe not as much as running premium since the 100% is at 89 octane as opposed to the 93 for premium. But I feel like I'm running more organic than with the ethanol mix. It feels pure, like the wind driven snow :-) (Californians heads are exploding trying to make sense of this...)
 
Hey now, I have lived in Wisconsin too. I know all about snowbanks - err, uh - wind driven snow.
No, I don't miss it either.
No one should forget the wise words of Frank Zappa either. "Watch out where those huskys go and don't you eat that yellow snow.
 
just ordered my rt carb and im really looking forward to getting this thing. how well will my torque be with this carb because i have 29" bike with a 44 tooth sprocket so i dont have great torque and i was hoping this would help me. also i was with my nt carb my bike wouldnt idle. when i pull the clutch in i have to pull the throttle so it wont die on me. is it possible this carb could fix my problem with idling?
 
Since every bike is different, nobody can say how it will affect your bike.

Anyhow, the rt carb is a popular piece. People say it is easy to get tuned and running right. As far as improving torque, it probably wont make a night/day difference. It's all in how you tune it.

You could get your current carb working better without swapping it out. The first thing to check would be air leaks. Especially with the CNS carb, air leaks around the carb/intake union. You can use RTV to improve the seal. Messy, but it works. By the way, what carb are you using?
 
G29, you should be able to adjust the idle quite well on that NT carby.

it almost sounds to me like you have a clutch adjustment issue...

The RT carb is popular, and could be an improvement overall, over the NT, except for basic simplicity. I doubt it will improve your bottom end torque noticeably.

There are two primary ways to improve torque out of the gate.
a) a lower gear ratio, which is basically more teeth on the rear sprocket.
b) increase the compression ratio, which will increase your power throughout the rpm range.

A tuned pipe will also increase torque, but mostly within a narrow power band.
It's frequently worse anywhere else.

Reed valves help on the bottom end, but that's far too expensive a proposition for these chinagirls. Might as well get a complete improved motor.

...and then there are shifter kits...

Good luck
rc
 
well if it has to do with my clutch i ordered a new complete bottom end. my crankcase had some bearing failure. my next upgrade will be a spb expansion pipe. then hopefully a shift kit
 
Genisisonyx29 said:
just ordered my rt carb and im really looking forward to getting this thing. how well will my torque be with this carb because i have 29" bike with a 44 tooth sprocket so i dont have great torque and i was hoping this would help me. also i was with my nt carb my bike wouldnt idle. when i pull the clutch in i have to pull the throttle so it wont die on me. is it possible this carb could fix my problem with idling?
Click to expand...

Yeah, there are other factors which could affect the idle, but I had problems with maintaining idle with my NT carb. I had to grind out some material on the bottom of the slide, essentially letting more air through, and that worked. The RT, or NG flat slide carb. made all my low engine speed problems go away.

-Fred
 
ya that actually makes sense to me lol. but if when I put my bike back together, and it idles this carb will be the best 30 dollars ive spent this bike
 
ya that actually makes sense to me lol. but if when I put my bike back together, and it idles this carb will be the best 30 dollars ive spent on this bike
 
Wow!

sounds like you are gonna have quite a nice motorized bicycle when it's done!

they are fun to work on, really cheap as performance type things go, and really useful, any way you look at it.

lol
I like 'em a lot!

Best
rc
 
Genesis, I think you will be pleased with sbp pipe, it could be that it was the performance change you where looking for buy changing carbs. The rt can be a leaky mess with plastic intake insert and will have varied rpm at idle if it does. Do not attempt to to tune a new pipe without different jets on standby. You might want to pick up a couple for the old nt if you are looking to break personal speed records. Just my own experience, respectfully.
 
I'm sure the RT is a good carb, but I am constantly changing my pipes, my fuel mixture, my plugs, and my air filters to find the best combination. I started out with a NT that was tuned to my 66cc HT, but as this thread points out, it wasn't that convenient to swap out jets. I started using Mikuni, Walbro, and Tillotson diaphram carbs with high and low speed adjustments. Now I can keep my mixtures at optimum settings with the twist of a screwdriver. No 4-stroking, no leaks, and no lemons due to the high quality of these carbs. It takes some research to match the right size to an engine, and some modifications have to be made for the swap, but these carbs are plentiful and don't cost much. I bought a box full from a local guy who fixes chainsaws and other power equipment. I only mention this as an alterative to carbs that must be tuned.
 
Just got my dax carb today (18 days to get to me, god damn you USPS), my god is it ever gorgeous, pictures dont do it justice. I cant wait to run it, but I gotta wait till morning to do it, Got the SBP pipe on the way too and hopefully I can grab a set of reeds to complete the package. Cant wait to try it out, I swapped out my GT5-a jug with a GT5 one so hopefully the smaller intake doesnt take too much away. Thanks alot, dax
 
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