Whats a good carburetor for my DT125 with a 170cc athena cylinder kit?

[Calum]

@claws It needs to run spot on, is my point. Even the new carb will need jetting.

[oldman]

@Calum said in Whats a good carburetor for my DT125 with a 170cc athena cylinder kit?:

@claws It needs to run spot on, is my point. Even the new carb will need jetting.

I second that

[claws]

@Calum gonna get it running great. better than with the original carb

[Calum]

@claws That's great to hear! I know from experience going too big is detrimental. But maybe I didn't spend enough time tweaking it!

[claws]

@Calum wouldnt be making any sense to not get it running great. gonna send a video of it running later

[Darty]

@claws

Not to sound boring, but, Keihin PWK 36mm of a KDX220

Been there done that, mental, makes no sense. Actually slower overall..

A 32mm can be spot on, if you like to 'hoon' constantly, but these engines are fussy to jet on a bigger carb, I don't recommend it.

[Calum]

@Darty Long time no post

[claws]

@Darty cant be slower than now though

[Calum]

@claws You'd be surprised.

I'm not going into the specifics.

But Pressure=force/area

The force is generated via the vacuum of the engine, the area is the size of the carb.

If the carb increases sizes, but the vacuum remains the same then you will see a drop in pressure. Aka, the pressure to actuate the carb will lower and it may not be as effective, sine the carb works off the venturi effect, getting this balance right is important. Going too big can have adverse affects. Is 36mm too big? I'm not saying that, I'm just saying bigger is not always better.

[claws]

@Calum of course a bigger carburetor isnt always better but i dont think that i can go slower with the keihin and if i cant get it to run great with the bike i will trade it for a smaller one. but a guy that i know put a 38mm carb in his 1998 dt125r and said that it runs great. still i believe that the new carburetor will out perform the one i have now but if it doesnt i will be a bit disappointed but anyways i wont lose anything with this new carb

[Calum]

Oh yeah! Report back to us your findings

[Darty]

@claws True, but don't forget you'll make less power under 6-8k Rpm.

@Calum lol I don't have much to say about these bikes anymore

[claws]

@Darty doesnt matter. it doesnt have much torque in the lower rpms but its because my ypvs is locked to the up right position. gonna get it resolved as well and maybe get an athena pipe for the bike since its made for the 170cc cylinder kit

[Glynn123]

Jetting a none standard carb on a DT is a ballache, 32mm polini pwk didn't make my DT much faster at all without any supporting mods like ignition etc. The fuel usage was well over double too even with both carbs appropriately jetted.

[Calum]

@Darty Join the club. But most of us talk about different projects these days.

[declan]

@Darty we kinda miss ya around here

[NINJA]

@Darty Which bikes are you currently working on/involved with ATM then dude???

[claws]

@Calum okay so the carb made the dt much better. didnt even have to tune it lol

[claws]

and i flipped the bike while doing a wheelie today. bent my front forks and got the rear plastic banged up. getting new ones tomorrow though