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  1. #1
    fixer's Avatar
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    99' 785 cdi in a 94' 750

    I'm building a 94' Fuji 750 with ported cyls., Ocean Pro head, 785 carbs., intake, & reeds, & PSI tripple pipes & read that I can use a 785 cdi to get it to rev higher. I have a 99' 785 complete electrical box I'd like to use but don't know how to wire the cdi. If anyone could set me straight it would be a big help. Thanks


  2. #2

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    yes you can there are some threads on here how to wire the cdi in
    some guys think there's no need to run a 785 cdi with the PSI pipes but i really can't remember what the rev limiter goes off at on a 750 cdi .The 785 cdi will let you turn 8000 rpms but i'm wondering what the pipes will run at i'm sure Xlint knows the rpm's he's been playing with them

    What size carbs are you going to use ???

    ---------- Post added at 09:38 AM ---------- Previous post was at 09:06 AM ----------

    after thinking about this if you going to use the whole 785 ebox all you need to do is wire the stator to the cdi just like it was in the 750 ebox and you just wont use the wires from the cdi for the valves .

  3. #3
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    can't, Color code is diffrent & the 785 stator has 5 wire & the 750 has 7. One of the extras is a ground & I'm sure the 785 stator just grounds through the plate. but I still have one extra & no clue what coil does what. I think I have to change the voltage reg. too the 785 stator puts out a lot more.

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    i know that alot of guys run 750/780 stators in there 785's so it has to work let me look at a wiring diagram

    ---------- Post added at 10:12 AM ---------- Previous post was at 10:10 AM ----------

    on my wiring diagram they both have 7
    94 750 blk, w/y r/w grn/r blu/r y r/pur

    785 w/y grn/r blu/r w/y r/w r/pur blk

    and wiring the coils is easy you need to get the wiring diagram for a 785 and you should not have to change the regulator

  5. #5
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    OK, I'm better now. I was looking at the harness for the servo & thinking it was for the stator. I have a 7 wire stator so I should be plug & play? (just scrap the servo harness)

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    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Fixer who did the port work?

    Make sure your OP head is flat, not warped. And that your cyls are all even. Any differences in height will lead to a possible gasket failure. Make sure to check your squish clearances too.

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    PSI did the porting. The head is brand new. I have also got .15 or .30 head gaskets to choose from. Any idea what kind of compression ratio I could expect from each?

  9. #9
    She likes the bike. But the ski gets her wet!!!! xlint89's Avatar
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    Where'd you get your parts from?

    Are they stock cyls that were ported by PSI or are they PSI Genesis cylinders?

    Keddano has a set of stock 750 cyls that were ported by PSI, but he has Genesis heads

    http://www.greenhulk.net/forums/show...ht=psi+project

    Pics please......

    I also assume you have the copper head gaskets. Make sure you "aneal" them prior to use and that you use Hylomar to seal them.

    Post #23

    http://www.greenhulk.net/forums/show...e-Engine/page3

  10. #10

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    Quote Originally Posted by xlint89 View Post
    Where'd you get your parts from?

    Are they stock cyls that were ported by PSI or are they PSI Genesis cylinders?

    Keddano has a set of stock 750 cyls that were ported by PSI, but he has Genesis heads

    http://www.greenhulk.net/forums/show...ht=psi+project

    Pics please......

    I also assume you have the copper head gaskets. Make sure you "aneal" them prior to use and that you use Hylomar to seal them.

    Post #23

    http://www.greenhulk.net/forums/show...e-Engine/page3

    HMMMMMMMMM now you've peaked Xlint's interest LOL

    ---------- Post added at 11:30 AM ---------- Previous post was at 11:28 AM ----------

    Quote Originally Posted by fixer View Post
    OK, I'm better now. I was looking at the harness for the servo & thinking it was for the stator. I have a 7 wire stator so I should be plug & play? (just scrap the servo harness)
    yep and the coils should be prewired unless someone played with them

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