350 cc big bore kit for KLX250, Ready to ship!!

Discussion in 'Vendors' started by Bill & Jo Ann Blue, Nov 11, 2008.

  1. Bake

    Bake adventurer

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    I'm running stock gearing.

    I'm using the stock carb, re-jetted, and the stock pipe, de-restricted, the stock air filter and the KDX200 air snorkle.


    Ok, here's my mpg numbers on two separate runs.

    Both rides were 65 to 75% dirt roads, at all speeds including runs up to 55 mph in 6th gear.
    And the other 25 to 35% were on the highway @ 60-65 mph, in only 6th gear.

    106.0 mile ride, avg. 45F, 59.55 mpg
    51.6 mile ride, avg. 60F, 61.94 mpg



    The fuel tank mock up is finished. The flat patterns for the pieces are ready. I think I have a source for the sheet aluminum to make up 1 or 2 tanks for testing. The actual fabrication process will not be a problem, but it may take a few weeks, between one thing and another.
    This fuel tank will not replace the stocker. It will be a second tank, with a "T" in at the carb, and it's own petcock and cap.
    #41
  2. Bake

    Bake adventurer

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    The 351 has it's own graphics coming soon. The finished versions will have flames in orange and reds atop the black.

    [​IMG]






    [​IMG]
    #42
  3. Bake

    Bake adventurer

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    Our dyno run today, with my bike. This is with the stock carb and stock pipe, and the rejetting I needed for the kit, along with the other "free mods"

    I've not seen many torque curves as flat as that. That is a good thing. Good pull at the entire range.

    The 351 is a tractor motor. You can see she signs off early, around 7000 rpm. But the abundance of torque is available quite low in the rev band. When I ride this bike, it performs just like what you see. It's got excellent hit right from the start.
    I'm still tweaking the jetting, it's a bit rich across the range right now, so there might be another pony left in there.


    [​IMG]
    #43
  4. Gany

    Gany Been here awhile

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    Looks good Bake, what jetting are you running at the moment?
    #44
  5. GB

    GB . Administrator Super Moderator Super Supporter

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    Bake,

    This engine mod is beyond my technical abilities. How many hours labor do you figure this would take if done by a bike mechanic? :ear Thanks for the feedback and info you've provided. I like the new graphics too :thumb
    #45
  6. Bill & Jo Ann Blue

    Bill & Jo Ann Blue Adventurer

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    It takes me 3.5 to 4 Hrs. to take the top end off & replace it with the new 351 kit. That includes answering the phone a couple of times.
    Bill
    B&B Cycle Restoration
    #46
  7. rickypanecatyl

    rickypanecatyl SE Asia adventure tours

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    So is the difference between the 22 hp and 26 hp just the carb and the slip on?

    Did you guys do a dyno run with the stock 250 engine? I'd be curious to see how it compares - same dyno stock.

    Any thoughts on whether it will be less reliable than the 331cc? I would imagine there is a bit more meat in the 331 between the water jacket holes and the sleeves ... will that be a factor?

    Thanks guys!

    Rick
    #47
  8. customerservice

    customerservice Been here awhile

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    No Slips to show but seen mine hit 20 something Hp on wheels, enigine guts and carb all stock aftermarket slip on stock headers with open air box.

    [​IMG]<o:p></o:p>
    #48
  9. Bake

    Bake adventurer

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    Ok, well since the cat is out of the bag already, here's where I'm at on our fuel tank.

    I've done 2 mock-ups, and the capacity will be very close to 1.1 gal. We plan on making it a complete bolt on arrangement, of course.

    We're doing the leftside tank first. I'm not convinced on a right side tank yet. Bill says we're doing it. I feel I want a ____ _____ on the bike to do this. About that, I'll only say __ _____ ___, because I also have that in development.

    I think the first tank will be ready for prototype fab in a week. As long as a major rework or something weird doesn't show up, production would start a few weeks later. I need to finish the tooling, but the designs are done. I will post up on the website the 2 prototype tanks ONLY AFTER we have ridden with it a good bit and are satisfied with it.

    All B & B CycleRestoration parts are proved out on our bikes beforehand. I will be shooting to have it in fairly rough country testing soon after fabrication is finished.
    #49
  10. rickypanecatyl

    rickypanecatyl SE Asia adventure tours

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    hey bake - i was still curious as to what the difference between your 22 hp and Bills 26 hp on the web site was?

    Thanks

    Rick
    #50
  11. Bake

    Bake adventurer

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    Yes, and we ran different tires. Mine was run with a D?S 50/50, while Bill's had the stock tire.

    We haven't spent the $ or time to run a stock bike, no.


    My feeling is it won't be any different in reliability than if you put in the 331 kit. The vendors of the sleeves, pistons, gaskets...it's all the same or better. I've seen the cylinders of the 331 and 351 side by side, and it's a barely visible difference at the water jacket.
    #51
  12. GB

    GB . Administrator Super Moderator Super Supporter

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    Bake,

    How's your fuel range with a full tank with the 350cc kit compared to the stock range before the conversion? :ear
    #52
  13. rickypanecatyl

    rickypanecatyl SE Asia adventure tours

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    Sorry for all the questions guys ... will the 351 kit go on a 99 KLX 300?

    Rick
    #53
  14. GB

    GB . Administrator Super Moderator Super Supporter

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    :ear

    :lurk
    #54
  15. rickypanecatyl

    rickypanecatyl SE Asia adventure tours

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    still wondering fellas?
    #55
  16. Bake

    Bake adventurer

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    Sorry I've not done updating on this thread...lesson learned, and I'll check back more often. Bill and I did the Gyp Hills rides-get together and spent a full day absolutely running our pair of 351's at 90% of our riding capabilities when we got into the open-range on our own. In the afternoon, I ran it 60 miles as hard as I can ride. I was beat for 2 days afterwards. Testing...and a ton of fun also!

    Bill doesn't spend much time with websites and threads...he has machine shop work to be doing, so I do the website development and some of the additional fabrication, concept and mock-up work.

    On the older 300, I'm not sure about that particular fitment. I'll be in the shop tonite, and I'll check with Bill on that. I'm going to guess if the 300 engine was unchanged through it's production run, it would fit, as the KLX250 and 300 are the same engine in many ways.

    In other news:
    1st production tank goes to the welder 4/16/09.

    I also have many new products in mind. With my experience with the 351 at my recent Gypsum Hills rides, I'm convinced there is a need and a market for serious off-road, TAT level parts. The 351 now has the performance to allow major off road capabilities. Here's a hint...there will be a D/S level support package, with the 34mm carb kit, the basic bashplate, the brake lines, and of course the extra tank....and now I want to offer some Rally-type level parts also. We have 6 items in concept now, and one could be in mock-up quickly, and another one is soon to be in dyno testing, followed by an exciting development in additional performance.

    Thanks, guys

    Anybody nearby want to loan us an '09 for a couple of weeks??
    :lol3
    I'll work with anybody within 500 miles of Wichita, Kansas, and Bill has said a discount on parts could be made on the deal.
    #56
  17. Bake

    Bake adventurer

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    Riding at good average speeds in D/S mode, my bike with stock modified carb and pipe is returning a reliable 59 mpg. I saw a high of 61 on a lazy, dirt road putt-putt ride. Bill's bike with the 34mm carb and a pipe returns about 50 if you're just touring around D/S style. However, we rode hard at the Gyp Hills, and he went to reserve at 98 miles. Some of that has to do with holding a steady high speed, without a lot of shifting and average speed changes.
    #57
  18. GB

    GB . Administrator Super Moderator Super Supporter

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    Thanks for the update!

    What's this about a bigger tank? :ear :tb PICS???

    I'd let you have my 09KLX in a second, but for the distance between us. :(:
    #58
  19. HalfPlate

    HalfPlate What? Where?

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    THANKS BILL!!!!!!!!

    351 Kit is done now just trying to keep the front wheel down whilst I breaks her in :clap :clap
    #59
  20. rickypanecatyl

    rickypanecatyl SE Asia adventure tours

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    Thanks for the update guys! I'm excited about what your doing.

    I have a KTM 690 enduro I ride everywhere and my wife has really been getting into riding as well. We were looking at getting her a new Yam WR250R when I heard about you guys. I'd read that though the WR has more hp the KLX has just as much torque and is more user friendly. We do ride on the freeway some with panniers and top bags and so I was concerned a stock KLX just couldn't do it.

    I almost pulled the trigger on a 2006 KLX for $2,900 that my plan was to convert it when I stumbled on a '99 KLX 300 for $1,200. Since I want to replace the carb and pipe as well I just feel better doing it on an older one - thus the question of can you put the 351 kit on the 300. Also we ride in some rough areas doing missions type work and consequently are actually "anti-bling" ... if I bought a new one for the reliability I'd trade someone my plastic with an old bike :lol3
    #60