How to use the stock toothed wheel

Tobisen · Post by **Tobisen** » Mon Mar 03, 2008 5:58 am

How can I set up the stock toothed wheel on my Suzuki Gsxr 750Srad?
I have tryed to be creative, and made this drawing of the wheel and vr sensor...
This is how it looks wheel engine is on its timing marks!:

Here a pic from my manual:

[/i]

old guy · Post by **old guy** » Mon Mar 03, 2008 7:16 am

I would remove the odd looking tooth on the trigger wheel and set it up as dual spark, single wheel input, 4-1 teeth.

Matt Cramer · Post by **Matt Cramer** » Mon Mar 03, 2008 7:16 am

Unfortunately this wheel will not work without modification with the current firmware.

Tobisen · Post by **Tobisen** » Mon Mar 03, 2008 8:03 am

Simply cut off the tooth?
Will I have to make any other modyfications?
Turn the thoothed wheel on the shaft or something?

old guy · Post by **old guy** » Mon Mar 03, 2008 1:50 pm

Matt

Are you saying that the wheel that he has will not work, or that a 4-1 wheel won't work?

Matt Cramer · Post by **Matt Cramer** » Tue Mar 04, 2008 6:40 am

old guy wrote:Matt

Are you saying that the wheel that he has will not work, or that a 4-1 wheel won't work?

The wheel he has will not; a 4-1 will. I hadn't seen your reply when I wrote mine. The settings you posted should work with no further changes other than grinding the tooth off.

old guy · Post by **old guy** » Tue Mar 04, 2008 7:33 am

What you need to do is to make your trigger wheel look like your drawing that I modified. Your settings in Megatune would be like the msq I posted. This is the default msq, so just pay attention to the ignition settings.

Tobisen · Post by **Tobisen** » Tue Mar 04, 2008 10:50 pm

Is the exsmple what you are running with?
I thought that I would have to set the "offset (advance) for output #2 for 180 deg?
When the first thooth is out from the picup cylinder 2 and 3 is in tdc!
If you see at the drawing, the thooth the picup is out from, is tdc from 1 and 4!
the grinded of thooth must be number 4?

Tobisen · Post by **Tobisen** » Wed Mar 05, 2008 7:55 am

I have grinded of the odd looking theeth, at try to crank it with the settinigs:
4 theeth
1 missing
offset #2: 180deg

Now I have spark:)
But only on ignition output #1!
And it looks like I have 3 sparks on eatch engine rew!
One at eatch thooth!

What is happening here?

old guy · Post by **old guy** » Wed Mar 05, 2008 3:41 pm

Set the offset for #2 to 0 and see what happens. You dont need an offset with skip teeth set at 2,because in your case it fires ign out # 1 at the first tooth after the missing one which counts as 1. The second tooth is count 2, so on the third tooth it fires ign out # 2. Then it see's the missing tooth which tells it to fire on the first tooth and keeps on doing the same thing every cycle.
Just out of curiosity I tried this on my test bench this afternoon and it worked fine.
Also you need to make sure you don't have your vr sensor wires crossed.
I know we are working in two different languages here, so I hope it isn't too hard to understand my explanation.