JD jetting guide question

[Bailey28]

I was about to buy JD's jetting guide so I could compare needles. I saw that he says >>>Microsoft Excel must allow the use of sheets<<<.

What does this mean? Also I have Microsoft works on my home computer, is that the same as Excel? The Excel program did not come on my pc, and is $139.00 to buy it...

Anyone here using something other than Excel to run JD's program? Any help would be greatly apprectiated. Thanks!

 

[eff]

Works will not work, however, I'm sure Google Docs will work and if not, OpenOffice certainly will.

http://www.openoffice.org/

http://docs.google.com/demo/edit?id=scAD4KwsofJVQDoc3eWCi9BHA&dt=spreadsheet#spreadsheet

 

[stainlesscycle]

works fine in openoffice.

 

[blanc]

What is JDs jtting guide\? Is iot GasGas specific

 

[GMP]

Its an Excel spreadsheet that lets you compare jetting graphically. There is a library of needles for the PWK and FCR carbs and their specific taper structures. You enter up to three jetting setups(pilot/needle/clip#/main) and compare the second and third to the first. Altitude and temp are also included. Keep in mind its a relative comparison, so you need a starting point. Slide# and JDs own needles are not part of the spreadsheet. Say you have a jetting problem where your a little rich in one spot. You can enter your jetting and a couple of trial changes, and see graphically what the changes will do in the area(throttle position) of question. As long as the needle(s) are in the sheet it will not matter what or what size the carb is. An excellent tool, I jetted a 125 from scratch (started with a good guess) with it with excellent results.

 

[stainlesscycle]

yep, excellent tool. gotta have a starting point to compare to. i use it quite frequently. wish it had specs for mikuni vm's...

i really wish it allowed you to enter slide comparisons....that would make it phenomenal.

and for those that can't find their needle in the chart, i believe you could add any needle in pwk needle data chart if you know the specs...

 

[GMP]

It works by calculating and relating the areas of the jet orafices and the nozzle area minus that blocked by the needle over the range of throttle position. Basically figuring a total area available for fuel to flow, and the ratio of each area to the total to estimate effect at that point of throttle position. All other parameters are assumed as constants except temp and altitude which are easy corrections. The slide would introduce signature into the equation and be a whole new level of complexity, and not a constant like the area of a jet orafice.

 

[Bailey28]

So I am guessing that all Keihin PWK carbs have the same size pilot orfice and the same size jet needle orifce or the program wouldn't work right.

I ordered the jetting guide yesterday from JD and downloaded the open office spreadsheet. Thanks for the tip! I rode with the CCK-3 a few days ago and liked it. It was not as smooth as the ECL, but it was not lean either. I really want to try the BGL I have as well, with the B taper starting early I went with the G L1. We'll see!

 

[GMP]

They probably do, but it doesn't matter anyway. Your missing the point, keyword here is RELATIVE. So, you enter what you have and you know the results, then you relate possible changes to it. There are no absolutes.