BORE OUT CARBS!!!!!

[syfull]

mmmm....so it is now a 25mm carb eh...so if i just mod the carb like this, does the power increases(difference)?what is the new top speed?how bout the fuel consumption?is it still reliable?and how do u remove the choke?

 

[phl6684]

its maybe gain a lil bit of power n torque etc..hahah
dare to try it..i want try it too..but time envy me...hahahahhaha
just wait about 2 weeks time i`ll post mine bore carb...
hahahah
who have drilling machine..want to borrow it..hahaha

 

[fleep]

mmmm....so it is now a 25mm carb eh...so if i just mod the carb like this, does the power increases(difference)?what is the new top speed?how bout the fuel consumption?is it still reliable?and how do u remove the choke?

it may increase a lil bit of your acceleration...

in removing your choke just unscrew the screws in the middle and at the side then pull the choke.. that simple

 

[fleep]

its maybe gain a lil bit of power n torque etc..hahah
dare to try it..i want try it too..but time envy me...hahahahhaha
just wait about 2 weeks time i`ll post mine bore carb...
hahahah
who have drilling machine..want to borrow it..hahaha

if you want il send you mine hahahahaha

 

[syfull]

this is a very nice mod but im planning to install UMA Racing 28mm carb...i already bought it though,but the problem is; my mechanic said i have to buy the main n pilot jet kit to tune it properly...any suggestion?what happen if i just install it without the proper jet kit??

 

[phl6684]

if lean there a problem to u..have to canhge the wear part inside..or simply overhaul..
if rich is also a problem to u..ur bike will jerk off during high speed..or simply cant get top speed...

ask ur mech bro..whether it suit to other carb jettings..
if uma racing jetting..huhuhu...better get ur pocket full of money..hehehe

 

[syfull]

damn carb....it's really is hard to tune this UMA carb...well now i have to stick to my stock carb for now n try to tune other things instead hehe...i think im wana try shaving my block a lil bit to make it have higher compression n change the valve springs...more research for me and more money to save(if i could that is hehe...)

 

[traxxas-modifier]

thanks to fleep for this good tutorial.
i have applied this to my aftermarket carb

guys you should try the technique called OVAL BORING of carb...
its one of the best way of boring out carb

 

[phl6684]

can u elaborate or maybe some illustration bro traxxas..??

 

[bizzy123]

The best way is record the whole process then post youtube

 

[traxxas-modifier]

the idea is you will boreout the upper onehalf portion of your carb to make it OVAL shape..

why oval?

if you have noticed and heard on someone talks about bigger carbs
have bad low rpm performance but good higher rpm performance.
its because on bigger holes on carb makes the airspeed velocity low...

because you are increasing the area only of the upper half portion upto the top.

you are increasing the power on high rpm but retaining the power
on low rpm.

heres my example... sorry carb i tried is not stock carb.
but same principle for oval bored out carb

using manual labor

notice the difference on the thickness of the metal of the bottom and top.

 

[phl6684]

damn u bore yoshimura carb???damn..u must have a lot of cash traxxas..

if i bore mine...i make an oval shape also..but on the left and right..can also right??

 

[jayjov]

sir trax,pwede ba nako na itry sa ako stock carb?hehe

 

[AZ135]

I just got done ported and polished my carb. Next step is to install the Dial-A-Jet and set it up for Nitrous Oxide. Here are some pics:

 

[makibaoh]

the pics is too large..cant view it properly bro.. :wink:

 

[traxxas-modifier]

damn u bore yoshimura carb???damn..u must have a lot of cash traxxas..

if i bore mine...i make an oval shape also..but on the left and right..can also right??

it took me several nights to decide if i bore my yoshi carb HAHAHA
but what the heck, we modify our bike to perform much better.
whats the use of having a carb if you dont modify it heheh
well it works better before, now its way way much much better hahaha

you can bore the left and right side walls from upper onehalf to top...

sir trax,pwede ba nako na itry sa ako stock carb?hehe

speak english bro for benefit of our asian friends.
yes it can be done on stock carbs

@az135
what sandpaper number you use to polish it?
bore out your carb since you have already started modifying it...

 

[phl6684]

wow..it realy shining...o want to do it 2 soon...

 

[AZ135]

I used a cone type polishing wheel with polishing compounds after porting with a stone wheel. It took me about 20 hours total. I flow tested afterward and gain about 17% on the top end with the choke and about 22% without the choke.

 

[kid]

it is 1st time i saw ppl use sand paper to do rebore carb.. and i wonder how long it take to make 22mm to 26mm rebore size.... i use gun potting hardware and caliper ( sorry if my spell wrong ) for measurement the size.. that my way huhuu

 

[ahmmedh]

What is the best carb for vision 60mm kit?
thanks
Regards