If you're searching into a 2004 yamaha raptor 660 carburetor jets purchase , you probably already know that these dual-carb machines can be a bit of a headache to obtain dialed in perfectly. The Raptor 660 is a renowned quad, but it's notorious for being picky about its air-fuel mixture, especially once you start including aftermarket parts such as a high-flow filter or a louder exhaust. Getting the particular right jets isn't pretty much making it go faster; it's about ensuring the engine doesn't operate too lean and melt itself or even run too wealthy and foul each plug putting in it.
Exactly why the Raptor 660 Needs Specific Jets
The 2004 Raptor 660 is of an odd duck because this uses two Mikuni carburetors for any single-cylinder engine. Most quads use one huge carb, but Yamaha decided to move with a dual-stage setup to assist with low-end grunt and top-end scream. When you go to make a 2004 yamaha raptor 660 carburetor jets purchase , a person have to remember that you aren't just buying one set; you're usually purchasing pairs that may even have slightly different sizes between the right and left sides depending on how your own specific machine is definitely breathing.
When you've noticed your own Raptor is swallowing on deceleration, bogging when you pin the throttle, or even struggling to start when it's chilly, the jets are usually the first place you need to look. Stock settings were developed for a bone-stock machine at sea level. In case you reside in the mountains or you've trim holes in your airbox, those share brass pieces simply aren't likely to cut it anymore.
What to Appear for Purchase
When you begin searching for parts, you'll visit a lot of options. You've obtained individual jets, common kits, and name-brand kits like Dynojet. It can end up being tempting to just grab the cheapest handbag of brass away the internet, but that's often the mistake. Cheaper, unbranded jets sometimes possess inconsistent hole dimensions. A "150" through a random kit might actually stream like a 145 or a 155, which makes tuning the nightmare since you can't trust the figures stamped on the side.
For a successful 2004 yamaha raptor 660 carburetor jets purchase , I usually recommend sticking along with genuine Mikuni jets or a reliable kit. These kits usually come with a range of sizes, which is helpful mainly because you rarely have it right on the particular first try. You'll want a collection of main jets and at minimum a couple associated with different pilot jets. The pilot plane handles the idle as well as the first quarter of the throttle, whilst the main jet takes over whenever you're really trimming.
Consider Your Altitude and Mods
Before hitting the "buy" button, take a second to believe about to ride. If you're using in the sand hills at sea degree, you're going in order to need much larger jets than someone operating in the Rockies at 10, 500 feet. Air will be thinner up high, so you need less fuel to preserve the right ratio.
Also, what have a person done to the particular bike? A "Big 3" setup (exhaust, intake, and a coder or jets) is the standard for the 660s. If you've got a complete Barker's or Sparks exhaust and the Pro Design intake, you're going to need to leap up several dimensions from stock. Nearly all reputable sellers may have a graph that gives a person a "ballpark" beginning point based on your modifications.
The Between Primary Jets and Pilot Jets
It's simple to get confused when you're searching at all these small pieces of metal. The main jets would be the big types that sit within the center associated with the carb dish. They control the fuel when the needle is taken out of the particular way—basically from half-throttle to wide open. If your Raptor feels like it hits a walls at high Rpm, your main jet is usually likely too little.
The pilot jets are smaller and handle the idle circuit. When your 660 is a pain to begin or if it dies every time a person let off the gasoline, you might require to go up a size for the pilot plane. In your 2004 yamaha raptor 660 carburetor jets purchase , make sure the kit actually includes each. Some cheaper kits only give a person mains, leaving you hanging with regards to low-end tuning.
Don't Forget the Needles
While we're talking about jets, we ought to mention the particular needles. The plane needle sits inside the slide and slides out and in associated with the main plane. Most high-quality plane kits come with adjustable needles. The stock 2004 needles are usually non-adjustable, or they don't have enough "taper" in order to provide the fuel curve you require for performance components. Swapping to an adjustable needle enables you to fine-tune the mid-range accelerator response without getting to take the particular whole carb aside again.
Where to Make Your own Purchase
Right now there are plenty associated with places to obtain exactly what you need, through local powersports shops to massive on the internet retailers. If you're looking for comfort, a pre-packaged package is the method to go. They're designed specifically regarding the 660's dual-carb setup and usually include instructions that tell you exactly which usually clip position in order to use for the needle and which jet to start along with.
If you're a little more experienced and know exactly what sizes you will need, buying individual Mikuni jets can save a person some cash. Just make sure you're buying the correct "style" of jet, as Mikuni makes several different shapes that appear similar but aren't interchangeable. The Raptor 660 typically uses the small round major jets, but often double-check your specific carb model before ordering.
Normal Pitfalls to Avoid
One of the biggest mistakes people make when doing a 2004 yamaha raptor 660 carburetor jets purchase is forgetting concerning the gaskets and anchoring screws. The screws on these old Mikuni carbs are notoriously soft. It's common to strip the head of a bowl screw while attempting to get it off. I recommend buying a place of stainless-steel hex-head bowl screws at the same time you buy your own jets. It'll associated with following period you have in order to open the carbohydrates much less stressful.
Also, look at your intake boots while you're at this. The rubber shoes that connect the particular carbs to the particular engine are vulnerable to cracking right after twenty years. When you have a vacuum leak there, no amount of jetting will make the bike work right. It'll usually act lean plus erratic.
Fine tuning After the Install
Once you've made your purchase and swapped the particular parts out, the particular real work begins. You'll want to start a little around the "rich" side (more fuel) and work your way lower. It's much safer to have a bicycle that stutters since it has an excessive amount of gas than one that runs so lean it gets very hot enough to damage the piston.
Do a "plug chop" to observe how you're carrying out. Ride the bike at full throttle in a higher gear, kill the particular engine immediately, plus pull the spark plug. If the particular porcelain is whitened, you're too lean. If it's dark and sooty, you're too rich. You're looking for a nice color, cardboard-like color.
Final Ideas on Your Raptor Project
The 2004 Yamaha Raptor 660 is nevertheless a complete blast in order to ride, even compared to modern 700s. It has the raw, mechanical experience that's hard in order to find these days. Getting the time to do an appropriate 2004 yamaha raptor 660 carburetor jets purchase and having the tuning right will transform the equipment. It'll go from a temperamental beast that stalls at stoplights in order to a reliable trail-shredder that pulls very difficult in every equipment.
Don't rush the procedure. It may take three or four times associated with pulling the carbs and swapping brass to get this perfect, but when you hear that 660 engine singing with no pops or bogs, you'll know this was worth the particular effort. Happy traveling, and stay secure out there within the trails!