Kiss my Keyster (carb kit needles)

brewsky · Post by **brewsky** » Sat Jan 08, 2011 6:16 am

Snakeoil wrote: I saw an exhaust gas analyzer that is small and could be strapped to a bike for road testing. I thought about buying it just to satisfy my curiosity on jetting carbs. With dual exhausts you could do each carb separately. Everyone says the left cylinder on old Triumphs always runs leaner than the right. I could finally put that legend to bed. But, alas, I never did buy the thing. Don't even remember where I saw it anymore.

Rob

Is this what you were referring to?

http://www.daytona-sensors.com/WEGO3.html

I recall seeing a home made version on one site with just an oxygen sensor wired directly to a voltmeter, with a correlation chart for voltage vs AFR

Homemade sensor installation:
http://www.daytona-sensors.com/download ... h_Note.pdf

Sure would beat plug chopping

teazer · Post by **teazer** » Sat Jan 08, 2011 10:31 am

Agreed that this is a much better solution than plug chops for the man who has everything.

http://www.innovatemotorsports.com/products/lm2.php

People have been jetting bikes for decades without that technology and in the final analysis, it's just another tool. It also needs a TPS to be really useful because fuelling is a function of throttle opening more than RPMs.

Snakeoil · Post by **Snakeoil** » Sat Jan 08, 2011 11:41 am

Thanks for doing the legwork, guys. I need to peruse those links as soon as I blow the 8 inches of snow out of my driveway.

The TPS point is an interesting one. I would like to think that since you are riding and not using a dyno, you could mark your twist grip to indicate which circuit you are using on the carb at a given time. Not sure how much recording and datalogging capability you could set up. I'm trying to envision a stop watch on the handlebar so you could use time stamps to determine the mixture at certain throttle settings.

The right way to do this is with a program on a laptop and the laptop bungeed to the bike with the EGA. I would think they make these for cars so it would just be an adaptation to a bike. If they design it right, it would give you spark timing, fuel mixture, and with a speed sensor it could even give you torque and hp based on some inputs for the bike and rider weight. I know there is a calc you can do just using a stopwatch and a speedo to determine torque and hp. Tough to do on a bike but pretty easy in a car.

This is one of those things where we should all be living in the same town. Then we all pitch in and buy the gizmo as a club tool and get the benefit of having it when we need it.

regards,
Rob

Snakeoil · Post by **Snakeoil** » Sat Jan 08, 2011 1:54 pm

Just looked at the links. WEGO was the one I saw. Looks like they've made some mods/improvements since I first saw it. The price is not low, but within the realm of a home shop toolbox if you play with a number of bikes. The other one from innovate is cheaper, but it appears you have to buy optional bits in order to equal what the WEGO can do.

I'm going to have to ask my cousin if he has a portable AFR. He's a SAAB mechanic and works on just about any brand of car or truck, gas or diesel and has every state of the art gizmo out there.

I wish I knew somebody with a dyno that would be interested in playing with AFR and trying to correlate it to plug reading. It would be a fun exercise and probably pretty informative, too. But if you had to pay for the dyno time, it would be cost prohibitive. I do have a friend with an SCCA racing team and they are in the process of setting up an engine dyno in their shop. I suppose we could rig up a coupling to run a bike engine on the dyno and tune it that way. PIA to have to pull the engine. But if you just finished a rebuild, it's the perfect way to tune it before installing it back in the frame. I'm gonna have to start schmoozing with good old Davey.

regards,
Rob

brewsky · Post by **brewsky** » Sat Jan 08, 2011 7:02 pm

The old post I found some time ago was about a do-it-yourself version consisting of just an oxygen sensor and voltmeter which could be done for way less than $100.00.

Will keep digging!

LOUD MOUSE · Post by **LOUD MOUSE** » Sat Jan 08, 2011 7:44 pm

I think I'll throw in on this.
In my opinion if ya have the valves set correctly (assume the adjuster screws have a good contact surface and the stems are not grooved) and the timing is set correctly (clean contacts on the points) and ya have a good set of plugs and wires ya can most times set the carbs as the tuning idea says and Forget About All the Special Tools, Test Equipment and go ride the bike!.
For some reason this generation of 250/305 owners are looking past the fact that HONDA designed/made a engine that Any Fool Can TUNE.
Change This/Change That!!!!!!!!!!!!??????????????
When ya change all the Running Parts Ya will more than likely have a engine which has more tuning problems than stock for sure.
When Ya build a Big Bore Engine (bigger Cams and Stronger Valve Springs) ya may find that it is More Difficult to Keep Running than stock or at Worst "Have A Grenade Blow Between Your Legs as I witnessed both many times in the 60's.
Those who race Know Ya have to Take That Engine Apart Often to BE SURE THINGS ARE NOT COMING APART!
And Some of Ya Think Ya can "Just ride the street" like a Stock Engine???????????
KISS! "KEEP IT STOCK STUPID!. .....lm

brewsky wrote:The old post I found some time ago was about a do-it-yourself version consisting of just an oxygen sensor and voltmeter which could be done for way less than $100.00.

Will keep digging!

bikedoctor99 · Post by **bikedoctor99** » Sat Jan 08, 2011 9:25 pm

Gotta love this forum- my favorite entertainment!! Waaaay better than TV: more drama and suspense, but most importantly for me, is the shared knowledge and in many cases, years of acquired knowledge. LM-- that was more than one line... I think you said it all and I totally agree with you. You do know what Bob Wills said about spark plugs don't ya?? My sincere thanks everyone- some very good and valuable information on this thread.