ESE's works engine tuner

[andreas]

Swepatrik, Yz 100 pistons meet your specs, but for the rings. Ok, this is brought to attention allready.

[husaberg]

[SwePatrick]

I have ran in to some misfires thou,, a question for you ignitech users:

Is it possible for misfire to develop if having wrong plugwires?
I have measured the original cable that came with my ignitech, it measures about 27Kohm
And plug wires i have right now measures way lower, only 26.5ohm

My ignitech is from the beginning bought for one cylinder.
But i use two sparks per revolution and double lobe triggerwheel.
Now when i bought a new double coil i didn´t have plugwires so i made new ones from MSD cables, never thought about the low resistance.
New coil has the same values as the old.

Rgds.

[wobbly]

Neither measurements make sense .
Normal solid copper wire leads will measure almost nil resistance over say 300mm.
MSD say that their Super core wire should be 50 ohms / per ft , and the Street Fire about 500 ohms / ft , this type of EMI suppressor wire is used for MSDs CDI high power digital systems.
Ignitechs must be run with a 5K plug resistance AND a 5K resistor cap , again to supress EMI from giving false triggering and misfires.
I have never used high resistance supressor wire , just high quality solid copper with the correct cap and plug - never had any issues with missfiring.

[SwePatrick]

My msd cables are about half a feet, so 26.5ohm would be about correct.
And for the other value it´s magnecor cable, AND my multimeter is cheap
And,, add that i´m no genious at understanding my multimeter *lol*
(My magnecorcable is probably set up with a resistorcap already)

Got ansver from Martijn that low resistance cables can disturb the ecu.

So i´ll test some other cable this evening.

[husaberg]

My msd cables are about half a feet, so 26.5ohm would be about correct.
And for the other value it´s magnecor cable, AND my multimeter is cheap
And,, add that i´m no genious at understanding my multimeter *lol*
(My magnecorcable is probably set up with a resistorcap already)

Got ansver from Martijn that low resistance cables can disturb the ecu.

So i´ll test some other cable this evening.

'Sweden still metric isn't it
despite what trump knew happened.

[andreas]

It's a twin.

[wobbly]

The other thing to consider is that with a double ended secondary coil you only get 1/2 the spark gap energy per side.
Try dropping the gap down to 0.4mm.
Also it requires much less energy to fire the modern Platinum/Iridium plugs like R7376.

[SwePatrick]

'Sweden still metric isn't it
despite what trump knew happened.

Haha =)
World leaders sometimes...

[SwePatrick]

The other thing to consider is that with a double ended secondary coil you only get 1/2 the spark gap energy per side.
Try dropping the gap down to 0.4mm.
Also it requires much less energy to fire the modern Platinum/Iridium plugs like R7376.

I found the problems, First i changed the plugwires and added 5k hats.
Then i had the 'baseadvance' way wrong, somehow the ignitech lost it´s memory, didn´t think of it.
But i saw the curve was like a 4 stroke curve to begin with, i changed that before first start, but missed that base advance had 21degrees to it.
My triggersetup should always have zero degrees.

Now it starts to sing.
But nowhere near to be fully tuned yet, as i have searched misfires, the fun stuff begins now



This was yesterday, like a huge rock dropped from my shoulders, finally no pops and bangs.

Edit: i run iriduim plugs, but these: ngk br9ecmix (oem ktm sx125)

[F5 Dave]

Well it sounds nice

[Pursang]

Reports of the Death of 2 Strokes have been Greatly Exaggerated!

22-year-old-honda-cr500-two-stroke-takes-on-450-four-strokes-at-the-british-amca-championship

https://motocrossactionmag.com/22-ye...-championship/

Not to mention... Neville Bradshaw is a 37 Years Old Privateer racing against 22yo Kids on Factory kitted 450's.

Worth watching to the end for MX fans. 3 Heats: 5th, 3rd and ???

Cheers, Daryl.

[andreas]

He's been doing it for a while, this time on a -89. And as we know the cr 500 gets better the older it is.

[SwePatrick]

Was meant to tune the bike today, i did a couple of dynoruns, but clutch slipped badly, REAL badly, expected clutch to be a weak point but this was really a LOT.

However i filmed a little warmup and then took two screenshots of the bad slip.
when dyno is flashing zero rpm, it is the rpm limiter that is hit, (13000rpm), no signal to coil = no reported rpm in dyno.

First the clip:


First pull(the best of three):

Just out of the box, really really bad slip, 35hp,, nothing to brag about *lol*

Second pull(the best of three):

Before this pull i shimmed the springs in the clutch and also lowered the oil level in gearbox as i noticed it was way to much even though i put one litre in as it says on the clutch cover.
In this series of pulls the clutch started to slip and then it kind of jerked and let go again, really bad, but i got 44.8hp to the wheel with still insanly slipping clutch.
Yellow lines is engine rpm, and it starts to slip at about 7500rpm

So a question, Are there any good clutch upgrades for 1kt engines?

Rgds
Patrick

[F5 Dave]

Never seen one but on my RZ with machining of hub and washer I got another plate pair in. More area is always the best. You can skim the steels but too thin and they will warp. I'd be favouring the gearbox lubrication over any perceived reduction of slip.