Whats a good carburetor for my DT125 with a 170cc athena cylinder kit?
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@Calum getting the keihin for 60 euros isnt a bad deal besides the screws for the carburetor are seized so i cant mess with the float or jets. also i can just sell the carb if i need to. im not an expert at tuning carbs but i can make it run ok
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wrote on 24 Jul 2019, 07:00 last edited by
@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
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@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!
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@Calum wouldnt be making any sense to not get it running great. gonna send a video of it running later
wrote on 24 Jul 2019, 13:48 last edited byNot 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.
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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.
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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.
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wrote on 24 Jul 2019, 16:29 last edited by
@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.
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@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.
wrote on 24 Jul 2019, 18:08 last edited by@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
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wrote on 24 Jul 2019, 18:14 last edited by
Oh yeah! Report back to us your findings
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wrote on 24 Jul 2019, 22:24 last edited by
@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
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wrote on 25 Jul 2019, 05:44 last edited by
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.
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wrote on 29 Jul 2019, 16:06 last edited by
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
