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need for speed

Discussion in 'XJ Modifications' started by gdb619, Jan 17, 2015.

  1. gdb619

    gdb619 Member

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    Hey I have a 1982 yamaha xj650 maxim I'm painting her this probably next month and while she tore down I want make her faster I was thinking of turboing her but I don't know is the a better way to make her faster end result I want to make my baby fast lol
     
  2. Stumplifter

    Stumplifter Well-Known Member

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    Faster?
    My 81 XJ650 is already a rocket sled in stock condition.
    Or maybe I'm old. . . . but when I hit that power band RPM range - it's like
    weeeeeeeeehooooooooooo! :p
     
    Stephen Downey and Josh phillips like this.
  3. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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  4. Polock

    Polock Well-Known Member

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    a lot of bikes are faster, just buy one. that's the easiest way
     
  5. cutlass79500

    cutlass79500 Well-Known Member

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    Put a turbo on it spend a lot of money if thats what you want. Or just go out by a newer 600 will be faster then your 650 will ever be with a turbo. Your dealing with old tech bikes here with 2 valves per cyl and air cooling.
     
  6. Quixote

    Quixote Active Member

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    If you like your 650 Maxim but want more speed, check your local listings for a water-cooled 750 MaximX. Or just get the engine and swap it into your frame if you prefer the home-grown approach. Here's how I did it: http://www.xjbikes.com/forums/index...gine-into-a-650-seca-frame.42248/#post-372423
    It isn't easy, but probably easier than a turbo. There are no turbo kits available for these bikes so you'd be fabricating a lot of parts yourself.
     
  7. KDub

    KDub Member

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    With a 650 Maxim I'd be upgrading the brakes a long time before I made it go any faster. The stock brakes, no matter how new or well maintained, are not up to the job.

    As for turbo charging, there was a factory turbo 650, I'd get one of them and borrow the parts needed (essentially most of it).
     
  8. FtUp

    FtUp Well-Known Member

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    you can't turbo a carb engine. the compression ratio is too high and the cam profiles and timing are different.

    FU
     
    Last edited: Mar 1, 2015
  9. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Turbochargers have been used on carburated engines since the first day that turbos were invented (1905). Cams can be swapped, compression ratios can be reduced (when needed). Even so this will be a money pit if he does it. But then some things should be done just for the fun of doing them, even if the results are less than spectacular.
     
    Last edited: Jan 18, 2015
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  10. FtUp

    FtUp Well-Known Member

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    what I was saying is that a stock carb engine will not accept a turbo. compression ratios are too high and blady blah. you cannot simply bolt a turbo on and go.

    FU
     
    Last edited: Mar 1, 2015
  11. chacal

    chacal Moderator Moderator Supporting Vendor Premium Member

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    Cams are different, heads are different, jugs are different (detonation sensor port), block is different (oil supply port for turbo), oil pan is different (oil return line), oil pump is different (to scavenge the oil return line's contents), gears are different (heavier duty and different ratios), valvecover is different (the 650T is a YICS engine, but it still used the older non-yics style gasket and thus cover and cam bearing caps are different, too).


    Worst bet: complete turbo engine, driveshaft (yes it's heavier-duty, too), swingarm (extra reinforcement gussets on that puppy), carbs, airbox, surge tank, TCI, and of course all the frame mods needed to get things to fit. Oh yeah, the turbo and ALL related plumbing.....and there's quite a bit of it. Don't forget the special exhaust manifold, which means don't forget the special headpipes and mufflers, too. Best pickup a complete wire harness and gauge module, too.

    Best bet: buy a complete turbo bike. Then you can have a turbocharged XJ650 without the gazillion headaches and expenses.
     
  12. KDub

    KDub Member

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    That's pretty much what I was getting at. It's probably easier to just put the Maxim tank and panels etc. on the turbo bike
     
  13. gdb619

    gdb619 Member

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    Thanks guys a lot of good info I'll let u know what I decide to do I think I like the 750 water cooled idea I have to look around
     
  14. gdb619

    gdb619 Member

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    As far as the power band goes what's the best rpms for the different gears to shift at maybe I'm just shifting to high or to low
     
  15. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Power comes on at 6k and does not drop off until after redline (but don't go past there on a regular basis).
     
  16. gdb619

    gdb619 Member

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    So don't shift till 6k?
     
  17. Stumplifter

    Stumplifter Well-Known Member

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    Depending on how 'tuned' your bike is - 6K +/- 500 (or so).

    Go into the higher RPM's and you will feel that baby KICK and start running like an ape that has been violated . . . . that is your power band range.
    Like Kmoe said - she stays there until you go past red.

    P.S> - make sure you are holding on!
     
  18. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Where you shift all depends on what you're doing. A comfortable ride through the countryside, or a long trip where fuel economy is important, then shift at around 4k. Out for a little fun then shift anywhere above 6k that you care to (I usually shift at around 8k when needing to acleerate hard).
     
  19. gdb619

    gdb619 Member

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    OK I had a buddy ride my bike and tell me he got more power out of the lower rpms so I'll have to try that thanks guys
     
  20. mindwebs

    mindwebs Member

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    To anyone intrested in speed and going fast:

    There are some very good rider training courses that will teach riders how to corner better and have 100% control

    i have learned alot, and need more training yet!! (only did basic class)

    safety is the highest priority, and the more you know how to do the better your odds.

    track and drag racers have had alot of training on how to do that safely, if your intrested in that then please pursue the rider training.

    yes, you can "learn on the street" but you will make some very expencive mistakes,

    the average "minor" road rash hospital visit will (without ambulance) cost around $10,000.

    20% body road rash + ambulance ride runs a minimim of $80,000.

    let's not even talk about a car impact while "street racing" broken bones, surguries, If you lived that is.....

    rider training classes cost $300-$15,000 (high end training with track time video recording playback for technique training)

    and you'll be a good "safer" racer because of it.

    hmm. cheap compared to the hospital.

    everyone could improve they're riding technique with a training course, and i believe it's money well spent.

    sorry end of sermon..

    Ride Safe!
     
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  21. ManBot13

    ManBot13 Well-Known Member

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    Just my $0.02, there's no reason to get "minor" road rash, no matter how much training a rider has. Proper gear will save your skin, on the street or the track. I went down around 50 mph and slid 150ft. Even with entry-level gear, some of which actually required replacement after the accident, I had 0% road rash and only needed to go to the ER to x-ray my wrist to make sure it wasn't broken (after getting my bike towed home).

    I don't consider myself lucky; fortunate yes, but lucky would have been wearing shorts and flip-flops and landing on a bed of pillows. I was fortunate the damage wasn't worse (hit anything at that speed and you'll break many bones no matter the gear), but it would have been a whole lot worse without the ballistic nylon Joe Rocket brand over-pants that I decided to buy and wear one year earlier. ATGATT will save your skin, and it costs a lot less than a hospital bill ($100s vs $10,000s).

    I'm sure it wasn't your intention mindwebs, proper training is great, and if you're riding track days you'll be forced to wear track quality leathers. But no matter the training and skill level, riders won't be invincible on the street and should still wear proper motorcycle gear.
     
  22. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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  23. Polock

    Polock Well-Known Member

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    just in case someone is wondering, your new heavy Levi's last about as long as 5 paper towels once they hit the road
     
  24. 1981MaximRider

    1981MaximRider New Member

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    can I put a Seca 2 650 engine in an 81 midnight maxim frame?
     
  25. MattiThundrrr

    MattiThundrrr Not a guru

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    I'm not condoning unsafe riding, here, but all this would be free in Canada! If you wanna speed, come up north. Only drawback is that summer is so short that you don't have enough time to get up to speed! Come for the healthcare, stay for the 11.5 month long winters!
    Just kidding! Ride safe, wear a helmet, and keep the shiny side up!
     
  26. FtUp

    FtUp Well-Known Member

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    matti, you are indeed a comedian! my darling wife avoided serious injury by wearing Kevlar pants when she locked up the front brakes and went down last month. she still had some bumps, but she shook it off and we continued our ride that day.

    FU
     
  27. MattiThundrrr

    MattiThundrrr Not a guru

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    Unfortunately, better with jokes than with a wrench!
     
  28. Bigshankhank

    Bigshankhank Active Member

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    Heck it doesn't take a lot of speed to get torn up, either. My wife got the front wheel of her gy6 scooter stuck in a railroad crossing groove at 15mph and got dumped onto the road. Broke her elbow and rashed up her back pretty good. Luckily she had her full face helmet on because the chin bar and shield were mangled as well and I wouldn't want her face messed up.
    The really aggravating thing is she had her Joe Rocket textile jacket in the trunk of the scooter, but it was such a nice day.....yes I still give her shit for that.
     
  29. hogfiddles

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

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    The seca II was a 600, but that's beside the point...........all your questions are being answered in your other forum that you started on this.

    Dave
     

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