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Beefing up my 650 engine

Discussion in 'XJ Modifications' started by badmonkey, Apr 28, 2014.

  1. badmonkey

    badmonkey New Member

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    Hi guys ,
    I am looking to improve horse power on my 650 maxim 83 any ideas.

    tkx
     
    badmonkey, Apr 28, 2014
    #1
  2. ecologito

    ecologito Well-Known Member

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    Get a 750. There have been plenty if discussions in this forum about out-engineer Yamaha and there best thing you can do is keep your engine well maintained. IF you want more ponies get a bigger one.
     
    ecologito, Apr 28, 2014
    #2
  3. Captain_Panic

    Captain_Panic Member

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    4-1 exhaust and rejetting. Also lighten the bike as much as possible. Don't forget that YOU count as weight also. Go on a diet if needed.
     
    Captain_Panic, Apr 28, 2014
    #3
  4. Fuller56

    Fuller56 Well-Known Member

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    Colin Chapman said "more horsepower makes you faster on the straights, less weight makes you faster everywhere". That may not be 100%accurate but mostly. Colin Chapman of Lotus fame... He said it about cars but it applies to bikes as well.
     
    Fuller56, Apr 28, 2014
    #4
  5. wizard

    wizard Active Member

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    Hook up a blower & run 33% nitro.
     
    wizard, Apr 29, 2014
    #5
  6. TIMEtoRIDE

    TIMEtoRIDE Active Member

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    Skip the 750 upgrade and go straight to a 900.

    98 HP !!
     
    TIMEtoRIDE, Apr 29, 2014
    #6
  7. hogfiddles

    hogfiddles XJ-Wizard, Host-Central NY Carb Clinic Moderator Premium Member

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    or put the 818 big-bore kit in-----------

    dave
     
    hogfiddles, Apr 29, 2014
    #7
  8. BaldWonder

    BaldWonder Innocent Bystander

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    Add a turbo from one of the seca models - or just do a full engine swap with a turbo-ed engine. A bigger engine while you're at it. Really it just depends on what you want to do and how big your budget is.
     
    BaldWonder, Apr 29, 2014
    #8
  9. ManBot13

    ManBot13 Well-Known Member

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    Don't consider this. Turbo Seca Bottom end it beefed up for the extra boost, and it's compression ratio is dropped. Not to mention all of the knock sensor, different TCI, fuel pump, pressurized one-of-a-kind carbs, etc.
     
    ManBot13, Apr 29, 2014
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  10. Gunbunny

    Gunbunny Member

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    This guy right here
     
    Gunbunny, Apr 29, 2014
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  11. badmonkey

    badmonkey New Member

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    Tkx guys for your inputs you gave me lost of things to think about.
     
    badmonkey, Apr 29, 2014
    #11

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