How to choose an upgrade carburetor for your warrior
Sept 10, 2013 21:00:18 GMT -6
Goody's Atv likes this
Post by Alex on Sept 10, 2013 21:00:18 GMT -6
Alright, so Ive seen lots of questions about upgrade carbs lately and i thought I might as well make a guide for how to choose your upgrade carb, so here it is.
So, first off, lets talk about the stock carb.
the stock mikuni carb is actually a damn good stock carburetor for this bike. it is a flat slide butterfly carb with an accelerator pump. there are mods you can do for nearly free to make this carb better:
1. pen spring mod: you will find when you take off the carburetor bowl that there is a really overly soft spring on the bottom of the accelerator pump rod. replace this spring with a pen spring. it will make the response a little more snappy.
2. the valve cap mod: after you take off the black plastic side cover you will find the slide mechanism. on the bottom right corner there will be a little gold rod with a black rubber boot on it with a white plastic lever above that. after time the white plastic lever will wear out and leave a big gap between the white plastic lever and the accelerator pump. if this is the case with your carb put a tire valve stem cap on top of this rod and it will close that gap caused by wear, making the throttle response better.
okay now lets talk about performance carbs for the warrior.
there are ALOT of choices for carburetors for the warrior. the most popular i know of:
1. keihin FCR 37
2. keilhin FCR 39
3. mikuni VM 38
4. mikuni VM 36
5. eldelbrock quicksilver
6. mikuni TM flatslide 36mm
now lets talk about the benefits and downsides to each carb as well as their upgrades.
you will need a matching throttle cable for each of these carbs.
keihin FCR 39/37
the FCR is an advanced carb used in YFZ 450s and such.
there are a TON of upgrades out for them out there, too many to list lol
they are hard to get the jetting right on a warrior and are VERY complicated.
they have electronic sensors on there for the YFZ which the warrior doesnt need. these extra wires can be cut off and disposed of or left on (personal preference)
both of these carbs you will LOSE power with out a truely modded out bike
39mm vs. 37mm
the 37mm is going to be more of a torque carb and the 39mm will be more of a high RPM carb.
you need a custom adapter to use either of these carbs on the warrior
VM 38
this is a good, all around, easily tuneable carb for the warrior.
used on mostly two stroke dirt bikes.
the best upgrade for this carb is the UFO. it is a plastic piece that goes on the bottom of the slide to defend against turbulence.
second mod you can get the dial-a-jet
you need a readily available (ebay) mikuni flange adapter for this carb to fit the warrior
better for moderately modded bikes
(hotcam, exhaust, air filter, high compression piston)
VM 36
basically the same carb as the VM 38 but smaller.
dial-a-jet and UFO apply also
works for less modded bikes
(exhaust, filter)
need the same adapter as the 38mm version to fit onto the warrior.
eldelbrock quicksilver:
a somewhat rare carb, but works extremely well on the warrior
easily tuneable (jetless)
you need an adapter to put this carb on a warrior.
mikuni TM 36mm flatslide:
this is a good all around carb for the warrior.
it is more of a medium level difficulty carb to jet.
you need an adapter to fit this carb to the warrior
awesome throttle response
essentially the more modded your bike is the bigger carb you can put on it. I do not suggest going over a FCR 39mm carb for anything.
So, first off, lets talk about the stock carb.
the stock mikuni carb is actually a damn good stock carburetor for this bike. it is a flat slide butterfly carb with an accelerator pump. there are mods you can do for nearly free to make this carb better:
1. pen spring mod: you will find when you take off the carburetor bowl that there is a really overly soft spring on the bottom of the accelerator pump rod. replace this spring with a pen spring. it will make the response a little more snappy.
2. the valve cap mod: after you take off the black plastic side cover you will find the slide mechanism. on the bottom right corner there will be a little gold rod with a black rubber boot on it with a white plastic lever above that. after time the white plastic lever will wear out and leave a big gap between the white plastic lever and the accelerator pump. if this is the case with your carb put a tire valve stem cap on top of this rod and it will close that gap caused by wear, making the throttle response better.
okay now lets talk about performance carbs for the warrior.
there are ALOT of choices for carburetors for the warrior. the most popular i know of:
1. keihin FCR 37
2. keilhin FCR 39
3. mikuni VM 38
4. mikuni VM 36
5. eldelbrock quicksilver
6. mikuni TM flatslide 36mm
now lets talk about the benefits and downsides to each carb as well as their upgrades.
you will need a matching throttle cable for each of these carbs.
keihin FCR 39/37
the FCR is an advanced carb used in YFZ 450s and such.
there are a TON of upgrades out for them out there, too many to list lol
they are hard to get the jetting right on a warrior and are VERY complicated.
they have electronic sensors on there for the YFZ which the warrior doesnt need. these extra wires can be cut off and disposed of or left on (personal preference)
both of these carbs you will LOSE power with out a truely modded out bike
39mm vs. 37mm
the 37mm is going to be more of a torque carb and the 39mm will be more of a high RPM carb.
you need a custom adapter to use either of these carbs on the warrior
VM 38
this is a good, all around, easily tuneable carb for the warrior.
used on mostly two stroke dirt bikes.
the best upgrade for this carb is the UFO. it is a plastic piece that goes on the bottom of the slide to defend against turbulence.
second mod you can get the dial-a-jet
you need a readily available (ebay) mikuni flange adapter for this carb to fit the warrior
better for moderately modded bikes
(hotcam, exhaust, air filter, high compression piston)
VM 36
basically the same carb as the VM 38 but smaller.
dial-a-jet and UFO apply also
works for less modded bikes
(exhaust, filter)
need the same adapter as the 38mm version to fit onto the warrior.
eldelbrock quicksilver:
a somewhat rare carb, but works extremely well on the warrior
easily tuneable (jetless)
you need an adapter to put this carb on a warrior.
mikuni TM 36mm flatslide:
this is a good all around carb for the warrior.
it is more of a medium level difficulty carb to jet.
you need an adapter to fit this carb to the warrior
awesome throttle response
essentially the more modded your bike is the bigger carb you can put on it. I do not suggest going over a FCR 39mm carb for anything.
