Upgrade for snappy power?

[stipe]

Hi there guys,

I own an Atomik nitrous 140cc, i'm wondering if you can recommend anything to make the power delivery way more snappy. The bike is quick as is but i want to make it kinda **** your pants scary in a sense.

Is this possible? cheers.

 

[my67xr]

Better camshaft and valve spring's, head port work, high comp piston etc will make the engine work better.
Better flat slide carby to go with it too.

Otherwise a bigger engine like the Z160HO will be the next step up

 

[crf_j]

Inner Rotor Kit will give more of a snappy feel to the throttle. Get a good one though...

 

[my67xr]

The Lifan 140's have an oil slinger so i wouldn't use an inner rotor kit
Lifan 150 adjustable timing semi digital outer rotor kit's are the go.

 

[stipe]

Would i be able to throw on a big bore or something like that? Was considering upgrading the carb as a start. But dont think it will change too much. "There's no replacement for displacement."

 

[my67xr]

You could have it bored and fit a 150 Lifan piston
There used to be a TB 57mm piston kit for them, but i dont think the sell them anymore.
Akunar would sell something, you'll need to email them and ask what they can do..
I think 57mm is the limit before it requires a case bore.
Then you could always go a stroker crank, that and the bore/piston kit will take it to around 161cc's
But then the gearbox /clutch becomes an issue..

When i swapped my mikuni copy 22/26mm for an OKO 26mm it was like chalk and cheese.
Throttle response was almost instant, and made it a bit harder to keep the front wheel on the ground.
Was always fun watching someone ride it the first time

 

[stipe]

So for now, swapping the carby seems like the right thing to do then go from there. Would you recommend any carbs?

 

[my67xr]

For the 140cc i'd use the Oko 24mm,
But if your planning on bigger cc's later go for the Oko 26mm

Get a bigger pilot jet as well when you buy it, a #38 should suit it well.
maybe an extra main jet or 2 as well, a 102 and a 105
The Oko carbs need a bigger air filter, get a Uni filter with a 48mm i/d
The throttle cable also need's to be changed to one with 150mm of cable out the end of the outer.
Dhz sell a kit at a good price, $165 including a quick throttle for the lot.

 

[stipe]

Yeah i was thinking the DHZ kit. What should i expect from the bike after installing the 26mm?

 

[my67xr]

It'll be a bit touchy on the throttle till you're used to it.
You will notice it will be a lot more responsive to your throttle position.
Will feel a bit more like a motocross bike.

Dont forget to spray or soak the filter in air filter oil too..

 

[gottagetacheaperhobby]

Get a good cam and valve springs to go with the oko. Classichonda50s have a few tb cams I think.. if you can find a hi compression piston from akunar it will also open it up abit.

 

[stipe]

cheers for all the responses. i dont want to spend and arm and leg on it as its just an atomik, so the carb replacement seems to be the go. Just a quick one should i go the 1/4 or the 1/8th throttle? im mainly doing flatland and train no tracks.

 

[my67xr]

Just an Atomik ?
Iirc the VCM Championship series was won on an Atomik a couple of year's ago.


Depending on what model your Atomik is, but they usually come with a 1/4 throttle standard
one like this-

 

[ringo]

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