ESE's works engine tuner

[oldjohnno]

I found that maintaining an equal amount of bobweight at each end of the crank was very important - if I got lazy and fudged it by taking a few grams off one end only the thing would vibrate disproportionally. You have to match the weights very closely end-to-end. I guess if for some reason - like a disc valve - you couldn't avoid some amount of unbalance at one end of the crank then you'd have to mirror that condition at the other end and balance the crank with the disc and flywheel fitted.

[adegnes]

The next time I have it apart I will do some serious balancing with disc and variator on the crank.

Before I give up and buy a Tillotson(can't afford one atm anyways...) I'll try extending the main jet with a short piece of tubing into a "well" with foam. Wish me luck!

[husaberg]

The next time I have it apart I will do some serious balancing with disc and variator on the crank.

Before I give up and buy a Tillotson(can't afford one atm anyways...) I'll try extending the main jet with a short piece of tubing into a "well" with foam. Wish me luck!

Every second chainsaw has one of those Tillotsons.
You are going to make the well deeper though as well for the PWK?
If you can find a suitable thread tap you could make one out of a brass pipe fitting?
Something like this?
https://thunderproducts.com/shop/dee...oat-bowl-nuts/

the fcr has the same thread it seems as the PWK (note the holes)

[adegnes]

You are going to make the well deeper though as well?

Yep, will drill out a spare "bottom screw" and epoxy an extension pipe to it, fill it with foam and run a piece of tubing down to the bottom of it. If it works I'll make something proper.

Just the small piece of foam around the main jet didn't help much. I tested that, did some jet changes and played with the ignition timing a bit today. Had planned for a lot more testing, but was cut short by angry neighbors. (video is uploading)
It responds to jetting at low rpm, but as Frits mentioned, when the fuel starts boiling it's all over the place.
Seemed to rev a bit better with a 135main vs 115, but when thats all from such a great jet change it's no point in trying to tune it. EGT remained the same.

Crossing fingers for the well to fix it.

[TZ350]

learnt a lot yesterday watching Speedpro working with the Ecotrons self learn feature of their EFI software. Using his dyno chassis load break Speedpro managed to hold the rpm/tps steady on my bike at enough points to give the software enough time to auto tune a number of points on the fuel Map. Now I have to sit down and analyse what it means.

[190mech]

The foam and extension in the main jet area should help the aeration,but what about the float and neelle valve as Frits stated?If the float level is constantly changing its height,then the emulsion tube will change the mixture strength also due to the level height..Next step is keeping the fuel bowl level constant,how can we do that??

[oldjohnno]

The next time I have it apart I will do some serious balancing with disc and variator on the crank.

Before I give up and buy a Tillotson(can't afford one atm anyways...) I'll try extending the main jet with a short piece of tubing into a "well" with foam. Wish me luck!

I know this has already been pointed out but.... why does the fuel foam? Vibration. And why is the fuel level all over the place? Vibration again. You could easily spend a few hours trying all sorts of kludges to manage the fuel and not be guaranteed success. Or you could spend that time checking and adjusting the balance of the entire rotating assembly and know that you have a good chance of improving things to some degree.

Good luck!

[adegnes]

After sleeping on it, here's the new game plan:

1. Try float bowl with well.

A. It works, finally get a baseline run to verify engmod numbers, tear down, carefull balancing of the whole crank assembly, porting and new pipe.

B. It doesn't, tear down, carefull balancing, reasembly, another attempt at a baseline run.

C. A and B failed, get a Tillotson.

IF A or B. Get a Tillotson anyway to cut down on intake length.

IF A, B, and C fails. Injection.

2. Retire.

There you have it, you're welcome to start yelling if I deviate from the plan.

[husaberg]

After sleeping on it, here's the new game plan:

4.07-4.09 is that a snowball hitting the front of the bike?

[adegnes]

4.07-4.09 is that a snowball hitting the front of the bike?

No clue...

[Frits Overmars]

Alex, I know it's cold over there. Still....

[adegnes]

Alex, I know it's cold over there. Still....

Good catch! Weird, I'll have to check on that.

[jonny quest]

Have you checked crank runout assembled in cases? I'd do that asap. If your balance factor is between 40% to 70% it's more than likely not the cause of fuelingredients issue. Something else is causing this.

Does bike vibrate in your hands? Is dyno wheel balanced? Is bike rear wheel balanced? Chain in good shape?

Frits... your pics always seem to be png files. Hard to open

[husaberg]

Frits... your pics always seem to be png files. Hard to open

I'd suggest that maybe you consider changing your browser. Updated versions display it directly.

[adegnes]

Something else is causing this.

We might have a breakthrough!
I just got an email from someone experiencing the same thing, engine going flat and unwilling to rev. There were others too with the same problem. We all have one thing in common, the Power Spark.

I'll hook up the ignition-mate, see if it'll reveal the issue.


One word, Ignitech.