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1250 head and ignition advance

Started by Yamahammer1200, January 28, 2016, 11:42:54 PM

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Yamahammer1200

Pulling off fairing panels revealed this ignition advance and rev limiter.  Can anyone ID this unit?  The advance is set to 5 degrees and the rev limiter to 9500 rpm.  The cylinder head says 1250, the tuning shop billed for a 1300, according to the paperwork.  The work was by original owner and the shop ain't talking, so I'm left with a bunch of questions.  Oh yeah, the Dyno peaked at 94HP.  K&N filter, stock pipes, and no clue about the jetting. 
Chrome don't get you home.
1989 FJ1200

fj1289

It is a Dyna 2000 ignition system.  You can find the instructions here: http://www.dynaonline.com/skins/downloads/instruct/DDK7-1.pdf

The 1250cc engines are commonly called 1300's - so I wouldn't be worried about that.

That seems like a low dyno sheet - even for a Factory Pro dyno.  If you are within a full days drive of RPM I know where I'd take it without a second thought. RPMRacingca.com

You'll find plenty of excellent reports on Randy and Robert at RPM.  

Good luck!

Edit - if it's a Factory Pro dyno - 94 with stock pipes and airbox doesn't sound off the mark

JMR

 The advance isn't 5 degrees....it is on the #5 advance curve which has the slowest total advance curve. Initial timing is probably 35 degrees or so. You might want to try the #2 curve

Yamahammer1200

Thanks guys for the info.  I will read the directions.  Usually I only do that when I have parts left over!
Chrome don't get you home.
1989 FJ1200

Earl Svorks

Quote from: JMR on January 29, 2016, 02:05:30 PM
The advance isn't 5 degrees....it is on the #5 advance curve which has the slowest total advance curve. Initial timing is probably 35 degrees or so. You might want to try the #2 curve
[/qu
Quote from: JMR on January 29, 2016, 02:05:30 PM
The advance isn't 5 degrees....it is on the #5 advance curve which has the slowest total advance curve. Initial timing is probably 35 degrees or so. You might want to try the #2 curve
ote]
  I'm sure you meant to say Total Advance[iof 35 degrees

JMR

Quote from: Earl Svorks on February 03, 2016, 07:57:53 PM
Quote from: JMR on January 29, 2016, 02:05:30 PM
The advance isn't 5 degrees....it is on the #5 advance curve which has the slowest total advance curve. Initial timing is probably 35 degrees or so. You might want to try the #2 curve
[/qu
Quote from: JMR on January 29, 2016, 02:05:30 PM
The advance isn't 5 degrees....it is on the #5 advance curve which has the slowest total advance curve. Initial timing is probably 35 degrees or so. You might want to try the #2 curve
ote]
  I'm sure you meant to say Total Advance[iof 35 degrees
You're right....thanks for pointing that out! Initial is 15 degrees if memory serves me correct.

Yamahammer1200

So I read Dyna's instructions and it looks like JMR is correct about setting #2 for the ignition advance.
Can I just switch the knob (with the ignition off), or do I have to change anything in addition to that? 
Ignition timing and electronics are above my pay grade, so any help is appreciated.
Chrome don't get you home.
1989 FJ1200

fj1289

Quote from: Yamahammer1200 on February 05, 2016, 10:49:22 PM
So I read Dyna's instructions and it looks like JMR is correct about setting #2 for the ignition advance.
Can I just switch the knob (with the ignition off), or do I have to change anything in addition to that? 
Ignition timing and electronics are above my pay grade, so any help is appreciated.

Yep - its that simple - just change the setting.  It "loads" the curve setttings and retard setting each time its powered up

Yamahammer1200

Well, I switched to position 2 on the Dyna 2000 and it feels like a different machine.
The sweet spot occurs at lower RPMs and feels more linear, less peaky.
The powerband is right where I want it to be.
Hard to explain, easy to feel.
Thanks for the help, you guys are great!
Chrome don't get you home.
1989 FJ1200

fj1289