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  1. #1
    Member Blockhead's Avatar
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    Random Thought...

    I haven't been around here a long time. Just picked up my new to me 2008 TW a couple weeks ago. The bike has 4400 miles on it. The more I dig into it, the more I realize that the previous owner(s) didn't do squat in maintaining the bike. Thank God there's so many knowledgeable people on this forum. I've learned a ton of good info...

    I read as much as I can before I ask questions here so as not to look foolish but I do keep asking myself this question: Why the hell aren't these bikes fuel injected yet?

  2. #2
    Senior Member SportsterDoc's Avatar
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    1. It adds cost, weight (not just the pump, but requires more current and therefore a higher capacity charging system)
    2. It increases the size of the tank, without necessarily increasing the capacity
    3. A submerged fuel pump cannot use all the fuel in the tank, so that gives less range on the same quantity of fuel.

    Fuel injection runs better cold and at altitude. However, the TK MV28 on a 2017 has a vacuum operated slide and needle which adjusts mid range mixture for altitude.
    As for MPG, it would be difficult to better 78 MPG.
    Carbs can be generally repaired roadside.
    Yes, EFI is less effected by storing ethanol fuel too long, but I was delighted to have one last carbed bike.

    Yamaha has developed a simpler EFI system for the XT250, etal:

    https://global.yamaha-motor.com/abou...se/35gs_02.pdf

    On my Bonneville, not having to remember to turn on the petcock is an advantage and over 112 MPH out of 865cc is partially attributable to EFI.
    Last edited by SportsterDoc; 01-21-2017 at 10:38 AM.

  3. #3
    Senior Member Smitty Blackstone's Avatar
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    And because they sell all they make without all that stuff.

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  5. #4
    Senior Member joeband's Avatar
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    KISS- keep it simple stupid.

    many have asked why and all but begged for what seem like easily made changes to our beloved bike; larger engine, larger tank, better suspension, etc... all of it would seem "so easy" but they have done next to nothing over the 31 yr span of this bike. nearly every part is interchangeable across 3 decades, that is unimaginable and unheard of for any other vehicle.

    how many do they really sell?
    here's data from 2010-11:

    Model – Units Sold
    1. Kawasaki KL650-E 4,006
    2. BMW R1200GS 1,142
    3. Kawasaki KLX250SF 1,011
    4. BMW R1200GS ADV 1,009
    5. Yamaha XT250 988
    6. Suzuki DR650SE 928
    7. BMW F800GS 923
    8. Kawasaki KLX250S 918
    9. Yamaha TW200E 785
    10. Suzuki DRZ-400S 727
    and for a lowly 785 sold in the US, again why would they bother?
    honestly a more relevant question is: why does yamaha keep producing the tw200?

    lets give thanks they do.
    littletommy, Lomax, Purple and 4 others like this.
    1994 TW226- 6spd. 10w-40 synthetic, XTHidden Content , XT225 stainless header, +2" Joemama swingarm, lizrd cooler, +20% fork springs, +25% rear spring, 2001 speedo w/ trip odo, pro taper atv bars, bark busters, shinko 241 front tire, front fender w/ mr bracket bracket, Hidden Content , o-ring chain, ricochet skid plate, Hidden Content , XT225 rear brake cam lever, folding-tip shifter, cycle rack, kolpin 1.5 aux tank & 1450 pelican case. Hidden Content or Hidden Content

    Hidden Content

  6. #5
    Senior Member Lomax's Avatar
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    I think they would do something like that if they did a major update or revision to the machine. I prefer the carb myself. less to go wrong and cheaper to fix when it does
    2007 Yamaha XT225
    2003 Yamaha Banshee 350
    2003 Polaris Sportsman 500
    1985 Honda 350X
    1969 Honda CT90

  7. #6
    Senior Member SportsterDoc's Avatar
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    Quote Originally Posted by Smitty Blackstone View Post
    And because they sell all they make without all that stuff.
    Yes
    Plus the tank configuration, which deeply straddles the frame, does not leave much room for a fuel pump.

  8. #7
    Senior Member Fred's Avatar
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    Profits from TW sales likely help fund R&D for next years highly competitive and more profitable motocross market. Fuel injection would entail significant investment in re-tooling assembly lines. With the exception of a few thousand incorrect oil filters Yamaha already has an existing network of manufacturers happily machining, casting and molding all the bits and pieces Yamaha then assembles. Why rock the boat when TW sales volumes are small with likely a marginal propensity of improved sales due to a fuel injection upgrade. Face it, we ride the ugly duckling ignored orphan of Yamaha's product line.
    2003 TW200 "Betty Boop"
    2006 TW200 "Nibbler", a.k.a. “Mr.Gizmo"
    Hidden Content All Things Considered I’ld Rather Be Motorcycling

  9. #8
    Senior Member SportsterDoc's Avatar
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    Quote Originally Posted by Lomax View Post
    ...I prefer the carb myself. less to go wrong and cheaper to fix when it does
    +1
    EFI replaces the carb with a fuel injector AND
    a. Fuel pump
    b. Fuel level sensor
    c. Fuel pump relay
    d. Higher output charging system
    e. Larger battery
    and for the simplest system -
    f. incoming air temp sensor
    g. intake pressure sensor (usually MAP)
    h. engine temperature sensor
    i. more fused circuits

    and on the more sophisticated systems, add
    j. throttle position sensor
    k. oxygen sensor (heated 4 wire, instead of 2 wire, on newer models)
    Last edited by SportsterDoc; 01-21-2017 at 11:03 AM.
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  10. #9
    Ken
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    Senior Member Ken's Avatar
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    The Suzuki van van has FI. I wouldn't be concerned unless really doing lots of rides at extreme elevation changes. Just like the front disc some claim it a must some don't care.
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  11. #10
    Senior Member socalnative's Avatar
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    As stated above, cost, complexity also this bike fits into the lower part of the DS market. There aren't any "modern" low cost DS motorcycles, so also lack of the competition doing anything newer or more modern doesn't force a revision. It doesn't hurt that it is decent at what it does and there is still a market for it.

    I like the ease of maintenance and relatively easy troubleshooting. The electric start is almost a negative in my eyes. But I love it when it works.
    Lomax and mudbug like this.

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