• Hi everyone,

    As you all know, Coffee (Dean) passed away a couple of years ago. I am Dean's ex-wife's husband and happen to have spent my career in tech. Over the years, I occasionally helped Dean with various tech issues.

    When he passed, I worked with his kids to gather the necessary credentials to keep this site running. Since then (and for however long they worked with Coffee), Woodschick and Dirtdame have been maintaining the site and covering the costs. Without their hard work and financial support, CafeHusky would have been lost.

    Over the past couple of weeks, I’ve been working to migrate the site to a free cloud compute instance so that Woodschick and Dirtdame no longer have to fund it. At the same time, I’ve updated the site to a current version of XenForo (the discussion software it runs on). The previous version was outdated and no longer supported.

    Unfortunately, the new software version doesn’t support importing the old site’s styles, so for now, you’ll see the XenForo default style. This may change over time.

    Coffee didn’t document the work he did on the site, so I’ve been digging through the old setup to understand how everything was running. There may still be things I’ve missed. One known issue is that email functionality is not yet working on the new site, but I hope to resolve this over time.

    Thanks for your patience and support!

Jd Kit, No Pu...?

C

ContraHusky

Husqvarna
A Class
If one is going to use the JD kit, is the P/U kit mod really necessary? There remain benefits to having a closed-loop system working. Namely, steady-state-throttle fuel economy (ie, highway driving) and movements to/from high altitude.

Taking the O2 sensor out of the loop just strikes me as kinda drastic, when it serves a function. There are other ways (JD Kit) to enrich the fuel mixture when accelerating.
 
according james from jd jetting,the mikuni fuel injected huskys must have the o2 sensor removed for his fuel injection tuner to work.dan
 
ContraHusky said:
Taking the O2 sensor out of the loop just strikes me as kinda drastic, when it serves a function. There are other ways (JD Kit) to enrich the fuel mixture when accelerating.
Click to expand...

The Lambda Sensor or "o2 sensor" is a narrow band 02 sensor. It does not do quite what you'd think: its function is to lean out the system whenever it and the ECU "thinks" it can. NO pratical function for what the bike is meant for. It makes the goal fuel ratio a poor one intended only to achieve EPA/fuel economy. These add on systems (JD/DJ) will not work right with the ECU in that mode and with the Lamda Sensor hooked up. Think of it like this: they'd be fighting with each other: since you can't achieve 2 A/F ratios at once.

having the system in Open loop lets you make adjustments with the Piggyback units- and puts you in more direct controle when making I/beat adjustments. Without goin into PU mode the 02sensor is like an annoying backseat driver that keeps putting in its 2 cents/ not knowing where we are even headed or that there's a big obstacle in 5.4.3.2.1!!! PU Mode is a more stable system that still uses Temp, Alt, air density.... as factors. I have ridden below 30' F at sea level and 95' F in the Mountains. Bike ran the same- no lambda/o2 since day 3.

seymore said:
The stock O2 sensor is a "narrow band" type that is designed to provide feedback only near 14.7 AFR which is very lean. Best power is usually made around 13.2 AFR. The stock O2 sensor along wit the catalytic was designed to keep the exhaust emission within EPA specs and not best power performance.

Installing the O2 sensor bypass plug cause the ECU to run in "open-loop" mode which uses value in the ECU fuel map. You may need to use iBeat the adjust the 3 points of the map to get best performance.
Click to expand...
 
Thanks for the input...I'm not going to worry about it. I might get a JD tuner, but will ride the bike through break-in first.
 
You should power up if you haven't yet...It is a husky-approved part and therefore won't void your warranty and it's better than risking having the bike stall on you while you're pulling in front of traffic!
 
There is absolutely no benefit for you to wait on installing a PU kit. Once installed, the bike will run as it was intended to, not too lean to meet the EPA emissions requirements. Unfortunately, the EPA is cracking down on motorcycles and weed wacker OEM's lately. Apparently they have overlooked the amount of emissions a typical commercial aircraft releases at takeoff. :lol: Where are all the lobbyists for us little guys?? :D

I want clean air to breath like the next guy but come on....do modern FI four stroke motorcycle engines pollute THAT much?? Why can't 21st century engineers create a motor that pleases the EPA and will run properly in stock form?? I believe it's a combination of politics and a limited financial budget.

Ok, I'm done ranting!! Power Up at will guys!!
 
I'd power up during breakin. I ran the first 30 miles without and the head pipe turns unnatural colors(not glowing red) with those lean settings. You can still go slow in PU mode.
 
I don't know the finer points of these Mikuni FI systems, but altitude compensation is mostly handled by the mass flow air sensor. Once the computer knows the amount of air mass entering the engine, along with other info, like throttle opening, engine rpm, etc, it then injects the fuel based on the map. The O2 sensor, is a feedback to the computer to determine what the outcome of its. It is not essential for altitude adjustment.
 
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