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Thread: TS cdi swap

  1. #1

    TS cdi swap

    hey guys i got a 640 m carlo +50 and was wondering if i should swap the cdi with the 770 cdi. is it possible and what benifts thanks ....tony


  2. #2
    Team RTYD burton9010's Avatar
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    there are two different CDI's that came with the 640's. One RPM limit was 6800 RPM and the other one was 7100 RPM. I am not sure what the RPM limit of the 770 is but I would just look for one of the 7100 RPM limit if you dont have that already.

  3. #3
    i have a 770 cdi already. so if its a 7100 it will work

  4. #4
    Team RTYD burton9010's Avatar
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    I think so but not 100% sure. Did your old one go bad or are you just looking for performance?

  5. #5
    its still good just lookin for a lil more performance. i was also going to mill the head to get 140-150 comp

  6. #6
    i herd somewere the 770 cdi would raise comp. but idk how?

  7. #7
    Team RTYD burton9010's Avatar
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    There is no way the CDI can rise your compression. Have you checked out the group K kit for the 640? I think its a good boost in power for the price.
    http://www.groupk.com/t650.htm

  8. #8
    so does it just raise rpm

  9. #9
    thanks for the info ...tony

  10. #10
    Team RTYD burton9010's Avatar
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    It can rise your RPM limit but it can also change your timing curve through your RPM range.

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