Thinking about adding a pipe to my Phazer, but am curious as how to go about jetting. Is that an adjustmet I can make, or do I need to buy something? Can I get away with just jetting, or do I have to do something with the clutch as well?

Thanks in advance.

TTT

Hey there, this mishgt seem familiar to you but here you, but thought id share this with some people who might not frequent that yamaha forum.

When people say "jetting", it means switching out one jet for another to either lean out the mixture(smaller jet=smaller hole in jet) which means that you are having a more air in an air to fuel mix in the carb. Richen the mix is exactly the oppsoite. Also, by saying to go for a larger or smaller jet, it only means the size of the hole in the jet, not the actual size of the jet itself.

I personally have never had to play with my jets as there was no need to but some, more experienced and mechanically inclined people find them relatively easy to adjust and others just stay away from the whole do it yourslef thing and go to the dealer or someone who knows what theyre doing. I personally am very limited in knowledge to this kind of thing and am trying to learn everything I can about them as the operation of a carb is very fine tuned and complicated.

Iv heard that when you add a pipe, that you richen the mixture by going to a larger jet as reduced backpressure in the pipe is allowing better airflow, meaning more air in an air to ful mix, meaning lean condition, which is counteracted with a jetting change.

Here's my take on jetting: Unless you have thousands of dollars to spend on replacement motor parts when you burn up your motor, use the following technique:

Increase jet sizes (main, pilot) and clip position until it's so fat it barely runs and smokes like crazy. Then back off a step or 2 until it runs decent. If you're on a budget, plugs should be _black_. Spark plugs are cheaper and easier to change than pistons and crank bearings. If you start to notice huge performance increases by jetting leaner, it means you're on the verge of burning up. any time you make any motor mods (pipe, reeds, etc) it's best to go up 2-3 sizes on the main, and then go from there. Keep in mind that the main is only for WOT, so unless you run WOT the whole time, you need to look at your mid range settings too (needle selection, clip position.) Chances are just adding a pipe won't require 2-3 sizes on the main, but better safe than sorry.

Jetting is absolutly critical for optimum performance and engine life. If you want your machine to perform it's best and run properly over all conditions you must understand how the carbs are tuned. This is especially important if you want to modify the stock set up with aftermarket exhaust and any other power adder. The general rule is that any modificaton and power adder will require more fuel, therefore, richer jetting.

Snowmobile carbs are also sensitive to atmospheric conditions. Changes in air density will have great impact on fuel demands and delivery that the carbs cannot compensate for by themselves. Altitude, temperature and barometric pressure all effect the fuel requirements of the engine. This is why a sled that runs really well on cold days may run crappy on warm days and use much more fuel, or a sled that runs well on warm days may burn down on a cold day.

Learn how to set up and tune your carbs before attempting to modify the engine.

When you purchase the pipe

Note what make it is

IE:

Aaen,PSI,DG,Bender,Reichards all make or made pipes for the Phazer

Then try to find the manufactures recommendations on jetting and clutching :sly:

A good pipe will add about 10HP to your Phazer. It needs to be more rich – in fact stock is rich on the dyno. However – leaning it out better numbers actually lost HP.

The Phazer comes with a lean spot mid range so the pipe makes it worse. I’m not into it – but I’m sure one of the aftermarket guys sells a kit to fix that.

You will feel the new power – it’s a good fix. Clutching should be a little lighter – maybe start with backing off the secondary – maybe a tooth or two on top as well.

an egt gauge can also help with tuning if its easy to read at wot. they come in handy but its hard to pay atention to them when your trying to watch whats in front of you at wot.

The only fool proof way of checking your jetting is via piston wash, plug readings are helpfull but not all that accurate.
Never set your jetting via an EGT gauge, they are best used as a means to monitor your corrected jetting.