Topic: Jetting spreadsheet project

[DavePhipps]

Been so busy, I forgot to bump this myself. Thanks

[geminimotors]

You the MAN! Thank you. I've been dreading the trial and error of jetting my chopper project, and a record of stock specs will save a bunch of time-n-trouble undoing the bizzarro stuff we all credcit the notorious PO for. Cheers!

[luap]

74cb550, stock cam,stock ignition,nope no ported head,mac4into1 open an no tip,uni pods pk22's 110main 38idle, 2 1/2 turns out clip 5th position all the way down
78550 stock,stock,stock,4into4open drag pipes,pods,110,38,2 1/2 tuns out, same as 74, road it for the first time today an its a little blubbery at wot so will try needle clip in different positions first then move to main
 look forward to seeing this speedsheet thanks
oh my buddy's 76 550, stock cam,full dyna coil wires an ignition, no ported heads,mac 4into1 with tip an baffle, pods 110main 38 idle needle clip in 5th postion air screw 2 1/2 turns out needle clip 5th position, thats to start havnt riden the bike YET almost maybe by this weekend hopfully
we in scottsdale arizona elevation 1000ft
last one 69cb175 with a 200 cb motor all stock except, 2into2 drag pipes an pod filters

[DSPRW]

Where is the link to the spreadsheet??

[stereosilence]

I think Lucky already has this.

[brandEn]

bumping this to see if we can keep it going. I need to buy some jets....

[lucky]

78 750K - Emgo Pods - 120 mains - everything else is factory stock settings/parts/exhaust... except for a "parts unknown" ignition system replacing the points &  condensors.


Almost fergot: Central Iowa

Stock exhausts too?


No extra air out =no extra air in.  That is why that works

[lucky]

I've had an idea floating around my head for a while.
We have specs for the stock airbox, motor, and exhaust. What we don't have is consolidated information about jetting that works with alternatives. More specifically setting that work well, no hesitation, surging or bogging.
I would like people to post their specs so I can put them in a spreadsheet.
I will need to know Bike, cam, ignition, ported head, exhaust, filter, main jet, slow jet, air screw, needle, and location so altitude can be added in.

Thanks
Dave

I have been collecting data for more than a year from 3 websites and the main problem is that many owners do not report back about results. If they are successful or if changes were not working.

[wowbagger]

I'll toss mine in the mix:

1971 CB500
stock airbox
UNI Foam filter
stock carbs and needle/screw positions
Stock cam
Stock head
Dyna 5ohm coils with stock points and condensers
NGK D7EA plugs (no resistance)
Dyna 7mm copper core wires
NGK caps (no resistance)
4 into 1 Winning Performance exhaust
located in Bangor, Maine

[BPellerine]

Like Lucky said would be nice to know what works for you.GREAT source for info though!bill

[Reganator]

Sounds like an interesting idea.  Wish I could give you mine, but my Frankenbike isn't quite tuned yet.

I can offer this though, I'm a statistician and exceedingly good with excel macros.  If you send me your raw data after you finish up I can work up something user friendly where from a menu you could input your setup and then have it load recommendations based on your input.  Might even be able to model some of the stuff in the middle or make predictions for setups that aren't explicitly in the data set.

[Frijec]

Did this project ever get put into a spreadsheet? If so, where to find it?

[rtbmrgl]

Bumping up this post, what is your jetting set up, headers, filters, etc.