Kytronic experience

[Storkfoot]

I have recently fitted a Kytronic to my TS1 (standard 225, Supertourer, Li150 box 46/16, PHBH30 with Ram Air filter through the panel). Now I have only, so far, managed 15 or 20 miles testing but I have a question.

First of all, my experience to date:

Dead easy to set up although, I checked the timing so many times, it seemed to take ages (strobed at around 2500 to 3000 revs). I have it on Curve 2 which retards from 25 to 17 (this is the only curve I have tried so far).

My initial run revealed it was running a bit weak somewhere around 1/3 throttle, I think. There was a little hint of pinking.

The highlight of this initial run was that the notorious "TS1 flatspot," which in my case was around 4200 revs, had gone.

For run 2, I changed from an AV264/x13 to an AV266/x7 second clip. Pinking now gone, running well and still no sign of flatspot.

My question relates to starting. In between runs 1 and 2 there was a couple of weeks but when I came to start for run 2, the first 5 kicks, say, felt like there was no compression. So much so, that I was just about to take the panel off and check there was a spark plug in I didn't and next kick, there was more compression and it started. Now I understand that advancing the timing should ease starting but, is this feeling of little compression a sign that I maybe have it too far advanced?

[coaster]

I thought you RETARDED to ease compression i.e. to stop the kick back that you get with 21-13 degrees

[Knowledge]

...... and next kick, there was more compression and it started. Now I understand that advancing the timing should ease starting but, is this feeling of little compression a sign that I maybe have it too far advanced?

Paul,

I would have thought that an engine has compression regardless of whether the spark is igniting the incoming charge or not.

I don't think the "no compression" feeling you experienced would be related to the the krytronic box.

[coaster]

...... and next kick, there was more compression and it started. Now I understand that advancing the timing should ease starting but, is this feeling of little compression a sign that I maybe have it too far advanced?

Paul,

I would have thought that an engine has compression regardless of whether the spark is igniting the incoming charge or not.

I don't think the "no compression" feeling you experienced would be related to the the krytronic box.

Not that cush drive again is it? or the clutch?

[Storkfoot]

Okay, I'll have another go and, if it repeats itself, I'll open her up and have a look. Thanks.

[Wack]

You will find that the Kytronic retards the full 8 degrees at kickstart speed then advances back to your initial 25 deg BTDC once up to 2 k revs which probably explains the feeling of loss of compression although if you used to run 17 BTDC static and the compression was stronger then you may have a problem with the top end. Depending on how and at what speed you ride then I wonder why you opted for setting 2 when there are other settings ?

[Storkfoot]

You will find that the Kytronic retards the full 8 degrees at kickstart speed then advances back to your initial 25 deg BTDC once up to 2 k revs which probably explains the feeling of loss of compression although if you used to run 17 BTDC static and the compression was stronger then you may have a problem with the top end. Depending on how and at what speed you ride then I wonder why you opted for setting 2 when there are other settings ?

My logic was that Curve 2 will be about 22 degrees at a modest 4000 revs. I thought that was reasonable ie not too far advanced. Also, my TS1 makes peak power at 6200 revs (20 hp) and curve 2 reaches max advance of 17 degrees just before that at 6000 revs.

Also, it ran well historically at 17 static.

Is that a reasonable way of looking at it?

I shall be getting it dynoed again shortly by the way.

[Knowledge]

I am sure you read my Oily Rag articles, but it is so easy with boxes like the Krytronic to get a curve on the dyno graph for each setting. It takes minutes. These can be overlaid on the graph to tell you what curve does what.

Then all you have to in choose the best one, and getting the jetting corrected.

If only it was that easy^

[Paulnobodyimportant]

Paul. Your about right with static on 24 degrees and curve 2. I have this on my 20bhp monza and TS1. Initially I had 26 static and curve 9 and realised that it would be running too hot if I wa pottering around a 4000 revs. After talking to Mark B, he recommended curve 2 and 24 static for my type of riding. Although on a long hard ride, may try some other curved if my revs are 7k and a bit more

[Storkfoot]

I'll be happy with one curve that is "safe" on fuel/air ratio all the way through the throttle progression and continues to get rid of the flat spot at 4200. I won't tinker beyond that.

On the kickstart issue I have had a quick mess tonight. It seems to lack bite/compression for the first few kicks then it is okay. I did just check I had oil in. Yes, thankfully.

[hullygully]

my TS1 230 runs on 24 deg static & mk7 on Ky-tronic

[Storkfoot]

HG, did you try any other curves?

I'm going for a 70 mile ride on Saturday and it's going on dyno next Friday. Hopefully, I'll have my head round what is going on by the end of that.

[Storkfoot]

I'll be happy with one curve that is "safe" on fuel/air ratio all the way through the throttle progression and continues to get rid of the flat spot at 4200. I won't tinker beyond that.

Finally got to the dyno today. Curve 2 has done what I wanted. It has got rid of the flat spot at 4200 and, around those revs, it's producing about 16hp when it used to produce around 12hp at that point in the curve. However, I have lost a bit of power at the top end (I have dropped main jet to 133 from 135 - PHBH30).

As ever, everything is a compromise but, for the moment, I am happy with the effect of the Kytronic curve 2 and I'll resist the temptation to tinker further.

[bike grim]

Saw you at Knowsley going in the opposite direction. I'd just left ( 4 wheels not 2). Sounds like a good piece of kit which I haven't given a lot of thought to up until now. What's the rest of you carb set up? I'm just about to fit a TS1 230 in with a 30mm phbh and a super tourer but gone a with pace maker box.

[Storkfoot]

It's a small world

On the dyno we tried AV266 and x7 and x13. X7 second clip is best on the road but there are a couple of small spots where it goes a tad lean (only just). X13 richened it up but when I rode it, it was fouling the plug riding back through Liverpool. I have gone back to x7.

Pilot is 55, float valve 300.

The main has come down to a 133 as it went way too rich at WOT with the 135 which had happily been in there for 6 years.

Previously before the rebuild, I had happily run AV264 x13 second clip down with a RamAir but even before the dyno I could tell that was too lean

I hope that helps a bit.

[superhooper]

Hi Storky, just fitted kytronic to my ts1, setting 2, 30 phbh through BGM airbox, set up/dyno by JB tuning. there is no flat spot at any revs and no spluttering sitting at 50 or below in 4th gear like it did before. Great bit of kit.
Super

[Storkfoot]

A PHBH 30 through the airbox! Have you compared it without the airbox, Roy?

I'd be interested in what your jetting is too please

[superhooper]

Set up before was 30 flatslide delly, open carb, jimmers manifold, Augusto 6000. This was putting out around 19hp, now through LTH lefthand manifold & bgm airbox/filter, kytronic putting out around 16hp. Torque is good. Only done about 60 miles so far but indications are fuel consumption is down considerably. I will try to find old dyno graph & new and post here. Don't know carb settings, will have a look when got time. Super

[bike grim]

Great info there fellas. I've just fittted a LHS LTH manifold as well.

What exhaust are you using super ? You were going to use a clubman style weren't you?

[superhooper]

Yeah but decided to stick with the krp1(original kegra one) as it works well.