Sanity check - Installing FJ1200 engine into an FJ1100

[Hersey289]

Hi guys,

The rear engine mount of my '85 FJ1100 is cracked and a permanent fix doesn't seem likely. Therefore, I'm going to install a '89 FJ1200 into the FJ1100. To be able to use my existing '85 stock coil packs and TCI ignitor box, I think all I need to do is remove the '89's single pulse pickup coil governor assembly and install the '85's dual pulse pickup coil governor assembly into the 1200 engine. Seems simple enough; am I missing anything?

Thanks!

[RPM - Robert]

Yes. Swap the pickup and rotor from your 1100 to the 1200 and it will work.

[Pat Conlon]

Hey Robert, are there any advantages on using the '89+ DCI ignition vs. the early TCI? Looks like the advance curves are the same.

The only things I can think of, the vacuum advance is incorporated in the TCI box where the vacuum advance module is a separate remote unit on the DCI boxes. If the vacuum diaphragm leaks, then you have to replace the entire TCI box, but not so on the later DCI systems.
The '91-'95 DCI systems can use 2.2 ohm aftermarket coils (Dyna greys), but the TCI needs 3.0 ohm coils (Dyna greens).

Makes me wonder why Yamaha went from a Transistor Controlled Ignition to a Digital Controlled Ignition.

[Hersey289]

Yes. Swap the pickup and rotor from your 1100 to the 1200 and it will work.

Thanks for the confirmation Robert!
Rob

[FJ_Hooligan]

Makes me wonder why Yamaha went from a Transistor Controlled Ignition to a Digital Controlled Ignition.

So they could incorporate an incredibly complex fuel shutoff simulator into the digital ignition....

ducking

Doesn't it have the signal to kill the fuel pump relay?

[Pat Conlon]

You rascal you.....yep good point Hooli, the DCI accepts signals and thus controls the fuel pump relay.

I wonder if the move to DCI in '89 had anything to do Yamaha's future plans for the '92-'95 ABS?
Does the DCI have an interface with the ABS ecu?
For that matter, is anyone running a Dyna ignition on their ABS FJ while keeping the ABS functions?