Paul's Yamaha 3MA track bike

[Paul]

Sorry Louis
Yes I'll look into the coil the coil tomorrow. You said it last time.
It will be the first time since the 80's I've had an electrical issue on a Yamaha if you're right.
One thing is for sure. I took this motor out another bike and didn't change coils. This engine is running with the other engines coil.
Holding thumbs.

[Paul]

dug in the spares box and found the coil for this engine, it is also a 00
no difference i am afraid
so i grabbed the lappie and plugged in the zeel
i gave it advance like never before
a big meaty fat ign curve

1500-19
2000-30
8000-29
10000-20
11000-13
12000-8
12500-5

and whallaaaaa, it works. i know tuned engines like advance but "thought" avgas didnt so i tried to stick with a standard type curve, only earlier i recalled a TZ curve that held the advance. keep in mind this is a highly tuned engine.
the above curve i did without looking at the below graph
i have now made another watered down curve based on this and will also run it, i have my revs limited at 12000 so i dont self destruct, dont want to do a "louis" now!!!! whaaaaaaBANG!

i am so relieved.

[Paul]

this also means my airbox mod works.

[Louis]

Hello Paul.

Good to here you solved the problem with your bike.

dug in the spares box and found the coil for this engine, it is also a 00
no difference i am afraid

Did you mount it, and try it.?
Or did you not used it because it whas the same type coil (3ma00)

Wouldn't throw it back in the spares box
Its a bid strange that changing a ignition curve, solved a problem that looks like/sounded like 'getting no spark''
(when the problem accures)
Perhaps it was a faulty program route. Had it sometimes with the ignitech to.
(it wouldn't start at all, programmed it again with the same settings and she fired up immediately)

No or less, its flying again. And that is exactly what it needs to do

dont want to do a "louis" now!!!! whaaaaaaBANG

Lets say I'm honored that I have created a 3ma term

[Paul]

I'm running the other coil now. Mounted.
I'll put more time into it next week. And more fuel.

That term is yours whaaaaaBANG because you caught it on camera and whenever I make changes I see it clearly. Now will this change do a Louis on me and go whaaaaaBANG

[Paul]

so now it's singing 
endoscope the pistons and no detonation   
jetting is sweet and it pulls clean, oh so clean 
now the big moment comes, and i curse the TZ i bought, because while this little 3MA goes something similar, it is not the same bike. it will never be a TZ, which is what i was trying to build when i started this over a year before i bought the TZ.
so..... i'm gonna sell it.

[Edd]

Hi Guys;

What I did find with the zeel coils dont matter I run mine on a 3ma10 coil but the bike electrics are 3ma00 initial coil had the same issues as a Paul changed between 10 and 00 coils same thing.

Paul glad to hear bike is fine and pulling nicely dont sell you need two bikes if you travel far for track days. backup is essential.

Edd

[Paul]

Ja edd
Will talk to you at next track day. Now you have that all singing and dancing trailer. Maybe you can help like we spoke. I'll know more in a month.
Spoke to George. Asked him to find me another TZ and maybe one for you. He laughed. Says you don't see them anymore. They get snapped up too quick.

[Neal]

You would have to double the price and budget on that .

Maybe you could run the bike on a rolling road or dyno and see with a timing light if it loses spark when you shut off like that . If not then it points to a fuel issue . Just thinking

[Paul]

Hi Neal
No I fixed it. Didn't realise that avgas needed more advance, its a slow burning fuel, a very clean and reliable but slow fuel. More compression would mean a little less advance. I have a slightly higher comp headset but that can wait.
It was not the coil. I reduced the advance after Louis advised just incase I was doing harm. But even a little reduction causes the problem to come back.
Thank goodness for the zeel as it is 8 degrees more in places.

[Edd]

Hi Paul'

8 degrees bloody hell that is a lot. Do you think this might be the issue with my 10500 rev limit with the 3ma10 heads. Whst I mean it is the timing that prevents the bike from reving any higher.

Edd

[Paul]

hi edd
this is new teritory for me
got it right on the 3ma
working on it with the 3xv now as it limits at 11000
it is happening fast at those rpm and you must catch the spark right else it will have adverse effects

[Edd]

Hi Paul;

Eagerly awaiting your results

Edd

[Paul]

Been away for 2 days.
I think add 200 rpm to all advance curve values over 8000 and carefully see if it gets better
If it doesn't make it worse go another 200
If its worse remove 200 an test
What size PJ are you running.
I changed my 3ma down to 30 and it helped. Remember 3ma PJ doesn't switch off.

[Edd]

Hi Paul;

Drilled it out to 0.6mm power jet will do some test on the advance on the dyno will let you know.

Edd