Odd-fire V2 bike engine ( it helps to state the case :-)

This install seems to have stalled because of neglecting 2016-11-22 recommendations to capture triggerlog with recent (eg. 1.2.31) firmware

Trigger setup

Events aligned to 300/420, not 360/360

assuming a 36-2 trigger wheel

I would set it up as 4 cylinder with individual spark delay

Try setting the trigger at 60 degrees before TDC. If you added your own trigger wheel, you have to check where the missing tooth/teeth are.

Second cylinder fires 420 degrees later, first cylinder fires again 300 degrees after that and so on.

Hello Dennis,

Could you provide a triggerlog of engine cranking 8-10 seconds without IGN and INJ fuse (but spark plugs mounted in engine so with normal compression cycle). Also make a vemslog of the same sequence.

Without enough data it is very hard to make suggestion to you to correct your setup. Lets start out with the basics, what engine are you installing; mount of cylinders, etc.

Please upload these files to your MembersPage directory in the FileArea and link them to your wiki page. After receiving these files and engine details i will review and make suggestions on how to proceed.

Best regards, Dave


Hello Dennis, (2016-11-22 <= Continue from here)

I have reviewed your triggerlog you seems to be running some very old firmware 1.1.94 i would recommend upgrading this to 1.2.31 first.

Than regarding the triggerlog itself, good format and length, perfect. Your triggerwheel is 36-2 and signal is without errors.

To setup this engine we will configure it as follows:

Please provide a new triggerlog and a small vemslog of the same sequence (cranking without ING and INJ fuse like before) after upgrading the firmware and applying the suggested settings so i can review.

<= IMPORTANT: required to continue. Required condition for support

Yes, see if you can do a triggerlog like Dave suggests. If the triggerlog looks nice, you probably just have the wrong amount of fuel or wrong basic fuel settings. Also, look at the top indicators in VemsTune. They will indicate trigger failure when the engine stalls, if the trigger setup isn't correct.

Odd-fire is correct. I am almost sure you have to choose odd-fire if you want to enter different angles between the ignition pulses (420/300 degrees). For even-fire, they all have to be the same.


Good evening.

I'm having trouble getting the Vems to ignite at the right time.

It is a motorcycle Aprilia RSV Mille 1000cc V60 engine.

There are only 60 degrees between the cylinders.

The problem is that it hits right on one cylinder, but on the other it is about 110 degrees past the point where TDC is. Where you can see the screwdriver from the left side, there is a fact where TDC is on cylinder 2.

Hope there is a kind soul that can help me.

Do not know if it does anything but the engine is running counterclockwise.

Cylinder 2 ignite for tooth 28. when there are 18 in next trigger tooht



This is cylinder 1 TDC at tooth 11



Here ignites the cylinder 2. But it's about 110 degrees too late


This is where it ignites tooth 28. when there are 18 in the program


This is the new trigger wheel 36-1