phazer carb update

M

mountainx

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Feb 23, 2004
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Sorry it took so long to find the papers.
I am getting the info out of the PSI pipe papers but it applys to all phazer motors with any kind of pipe.

PSI states this as A high altitude but I am at low altitude and it made A big difference.

This is straight from the paper:

We suggest to remove the carburetors for this modification, and will begin by removing the Bronze colored Welch plug behind the adjustable fuel screw on top of the carb. Remove this plug by gently drilling a small hole through it and then turn a short sheet-metal screw into it. Use a vise grip to pull the screw, to remove the plug. Be careful to drill only slightly through welch plug, otherwise you could damage the carburetor.

After removing the plug, you will notice three very small holes in the carb body. It will be necessary to drill the rear hole, the one towards the airbox side, to a drill size #56 or .046. This will help a great deal with mid-range response and help eliminate mid-range pinging. The Welch Plug sheet metal screw hole can be epoxyed shut and put back into its original mount when your finished cleaning the carbs. Then cover entire Welch Plug with epoxy to assure no air leaks.

A cupple tips for doing this:

I used a slide hamer to pull the plug out. That worked better then a vice grip.

To drill the hole out I recommend doing it by hand. I messed up a set of carbs doing it with a drill. remeber this is basically a jet so it has to be perfect!!

Make shure that there are no burrs when you are done as they can fall off and plug the holes or restrict the fuel flow.

I hope this helps you guys out. If you have questions or coments please post them and I will do my best to help out


Thanks, Justin
 
Here is some info. The improved carbs started on 1996 Phazers and Ventures. Any year below that could be modified with the new parts. Hartmann Inc. used to sell a kit to modify the carbs. I do not know if they still do.

http://www.totallyamaha.com/snowmobiles/aaTECH/carbs/PhaserCarbs.htm

In addition to what is listed, there was also an adjustable main air jet in 1996 to replace the fixed one on the earlier models. I do not know if it can be retrofit to the older carbs. The information is lacking.
-From the 1996 technical update manual.
 
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I do not no if they changed them on the newer yaers as the last one I had was a 93. When I did my 93 I put a PSi pipe and did a little porting. When I did this I also had to change the nozzles and I ended up with one size bigger drill on the carb mod. Mind you that motor was a little lean in the midrang in stock form
 
Do the carb update parts (new primary nozzle and main nozzle) take the place (have the same affect) as the drill procedure? (can you do one and not the other?)
 
The PSI method is very easy to do and works great! This was done on my old 95 Phazer with a DG pipe and had no problems.
 
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