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Thread: 350 Xtreme build with a 250sx Chaser

  1. #1
    murfman is offline Just Too Addicted Arm chair racerJust too addicted
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    350 Xtreme build with a 250sx Chaser

    Bear with me for a little bit, but I am starting a build on my '85 350X. I bought it from the original owner 3 weeks ago in Muskegon Mi. My original intention was to ride it for a few months and give it a cosmetic refresh. After I got it home I added a UNI filter and rebuilt the stock carb, changed the oil and replaced the plug. That got it running well, and starting on the first or second kick with no noises or excessive smoke, shifted fine through all the gears and pulled pretty well. I dove into the brakes, as the rear caliper, master AND pedal/linkage were ALL bound up tight. I replaced it all and got it to a point where it would stop as well as it ran. At this point I was a happy Camper. (Notice the building momentum of a snowball here?) After scrubbing it down and removing what was left of the original fork boots it didn't look half bad. Like the idiot I am, I failed to take any pictures whatsoever at any of these stages.

    Friday night I was out tinkering i the shop and thought I would try swapping on a TRX450r muffler I got from a co worker, along with drilling out the broken bolt on the upper muffler mount as well as the right rear foot peg mount. This is where the snowball REALLY picked up steam. The joint between the muffler and head pipe was on SOLID, PB blaster, Heat, Ice, etc... had no effect. I finally got the muffler off but had to curl up the inlet pretty bad. At this point I thought I would take off the head pipe to clean it up, and trying my damnedest not to ended up breaking off all 4 studs going into the head. At this point I said screw it, I wanted to refresh it anyways, so I blew it all apart down to the bare frame. (The Snowball is ~ 100' in diameter by now) I ordered a set of gussets from TPC, shipped all the aluminum bits and pieces (EVERYTHING but the motor) to GKing polishing this morning, dropped off the swingarm, kick starter, brake linkage, footpegs, shifter, sprocket cover off at the chrome platers. And I dropped off the bare frame at LoKo Coatings to sand blast so it will be nice and clean for welding the gussets on. I also plan on dual Oil coolers and will have to fab up some mounts for that as well. So far this is what is firm on the build:

    Stock 85 color scheme on the seat and plastics (Obviously changed to the black plastics and candy red frame)
    Progressive springs in the front forks
    Goki Starter (I know it is Hideous, but my big plan is a 250r for me to ride and the 350 will be for my Wife)
    Simply Suspensions rebuild of the rear shock
    10" Front Wheel (From the Group Buy Here)
    Wide Foot Pegs from 250r Roostmaster
    Candy Red Powder Coating to go with all the bling
    Trx 450 Muffler
    400EX head pipe

    As for the motor I am really thinking I am going to go with a 96MM piston and ported head from Hurricane 635.

    I promise to be better at taking pictures from here on out, this is what I have in my shop tonight:






    NOS 350x forks (Not sure If I will use them on this build or wait for another project


    The 250sx will be the followup project, my plans for it are simple a cosmetic refresh with a white tank red fenders/headlight and blue seat with a candy blue frame, 350x forks, 10" Front Wheel, Exhaust, the 350x Carb and rear suspension upgrade




    I am open to any suggestions or ideas concerning either build Thanks for looking Murf
    Last edited by murfman; 11-23-2011 at 04:49 PM.

  2. #2
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    Awesome! How many cc's does the piston bring it to?

  3. #3
    350xx is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    This is going to be a great build. Dont forget the pics so we can follow your progress. Lightened flywheel and 400ex carb are GREAT cheap mods. There are people on this site that will lend you a hand in your time of need. Nice to see a fellow 350x owner!
    As for the carb, i would say get a good ebay one or go 140 bucks for a new one from WINCYCLES.
    Have fun! Looking forward to the progress.
    Subscribed!
    P.S. NICE NOS FORKS!!!!

  4. #4
    Join Date
    Dec 2010
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    Victoria, British columbia Canada / Winnipeg Manitoba, Canada
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    Did you get those forks off a guy by the name of rock?? He has tons because I got my NOS 250r engine off of him!
    MY TRIKES! :
    1- 85 250r NOS engine
    1- 1985 350x
    1- 82 250r + Parts
    1- 86 250es Big Red
    1- 85 200x
    2- 84 200es Big Red
    1- 84 200M !!MINTY!!
    1- 73 Atc 70 (project)
    MY Snowmobile's!!
    1999 Polaris Indy 440
    1999 Ski-Doo 583
    1993 Polaris Indy 500
    My Dirt Bike
    1986 Dr100
    AND A SCOOTER!! 1986 Honda Spree

  5. #5
    Join Date
    Feb 2011
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    Sarnia, Ontario, Canada
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    3,415
    I just finished one of those rebuilds on my 350x..money sucking pit from hell!! But it looks nice now..

    Click image for larger version. 

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    Here is a fun idea for your SX..I didn't want to do a cosmetic refresh on it like the 350x since it's the machine my brother rides when we go out together and he like to bump into stuff.

    Anyway, I wanted to get rid of those god awful balloon tires..so I got some Bear Claws front and rear. I had to mess around with spacing a bit, but I put an 11' rim on front so I could change up the front tire size. A bit thinner and taller like the sport trikes..pretty cool and didn't break the bank. Here is a pic..

    Click image for larger version. 

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    It's an absolute animal now..I sometimes like riding it more than the 350x!!
    Current toys..
    1986 Honda 350X..trail bomb!
    1985 Honda 250SX..my main mudder
    1985 Honda 250ES..Back in Black Trike
    Current non-trike toys:
    1990 Honda TRX300FW
    1995 Seadoo GTX
    1998 Polaris Indy Lite 340(Nearly new looking)
    1998 Polaris Touring 500
    1998 Club Car (electric)

  6. #6
    murfman is offline Just Too Addicted Arm chair racerJust too addicted
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    I picked up the forks on Ebay, the 96mm piston makes it a 492 (Close enough to call it a 500) On the SX I already have another set of forks from a 350x with progressive springs for it. I am waiting to hear back from Hurricane635, I think I am going to need a carb that is bigger than the 400ex one if I go with the 500. I just want to make sure the motor stays reliable, does not overheat, and last for a long time before requiring a rebuild. I want to do this once and only once. The reason behind the 450 muffler is I need to keep it quiet, There are plenty of farm fields to ride around my house, but the fields are surrounded by homes and I don't want to annoy the neighbors too much.

  7. #7
    Join Date
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    The 450r muffler will make your neighbors very happy!! Best thing I did to my 350X Can't wait to see this build up!!!!!@!!!!!!!'

  8. #8
    Join Date
    Feb 2010
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    Visalia, CA
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    If your going that big, you may wanna consider a 38mm kehin FCR pumper carb of a newer dirtbike. like somthing off a crf250R,YZ250F,KX250F Etc. I got my carb off a 04 YZ250F. Its a tight fit, but its WELL worth it.
    "Your 4 wheeler must be fast because you were haulin' ass....UNTIL I passed you on 3 wheels"

    RIDE RED......OR RIDE HOME


    TRIKES ARE NOT DANGEROUS......IDIOTS ARE!

    RIP


    NOS_350X is the most bad-ass person in the world

  9. #9
    Join Date
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    Albert Turkey New Mexico
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    Sounds good, sent you a PM.
    I'm not bipolar I'm tripolar!

  10. #10
    murfman is offline Just Too Addicted Arm chair racerJust too addicted
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    PM Replied..

    Looks like it is going to be a ATC500x

  11. #11
    murfman is offline Just Too Addicted Arm chair racerJust too addicted
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    I will get some pics tomorrow after I clean up the shop, because I am a bit ashamed of the mess. But I stripped down the motor as far as I could without a flywheel puller, the cylinder and piston look real nice, pity as I wont be using either lol. Actually everything inside the motor has looked real good so far. Even the rear shock was still charged! I have a second box filling for G-King to polish and a box for LoKo to Powdercoat. The Chrome guy called and said my pieces may be done by Friday as well.


    A few questions,
    Obviously I need a gasket set, is there a brand I should look for or stay away from?
    Is it worth replacing the stock rear spring on the coil over?
    I need a Cam tensioner, I see that the 86 used a different one, is one better than the other, or should I go with a manual adjuster?

  12. #12
    murfman is offline Just Too Addicted Arm chair racerJust too addicted
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    Got the case split last night, shipped the head and cases to Hurricane 635 for portwork and boring for the 96mm piston, salso sent off another round of parts to G-King for polishing. I dropped off a box of bits and pieces to be powdercoated as well and was suprised to find out my frame was blasted and waiting for me. I got home and the first (Of many) piece of bling showed up, along with some other bits and pieces I ordered:



    I will get some pics of the frame up after I recharge the batteries for my camera. So far it has been a pretty good day

  13. #13
    Join Date
    Feb 2011
    Location
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    Oh man, you are gonna have a hellafun knocking the shiny off that when it's done!!
    Current toys..
    1986 Honda 350X..trail bomb!
    1985 Honda 250SX..my main mudder
    1985 Honda 250ES..Back in Black Trike
    Current non-trike toys:
    1990 Honda TRX300FW
    1995 Seadoo GTX
    1998 Polaris Indy Lite 340(Nearly new looking)
    1998 Polaris Touring 500
    1998 Club Car (electric)

  14. #14
    murfman is offline Just Too Addicted Arm chair racerJust too addicted
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    Checked out my now clean frame, and not one nick, scratch, dent or CRACK to be found anywhere.







  15. #15
    murfman is offline Just Too Addicted Arm chair racerJust too addicted
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    I found 2 "Before" pics, actually from before I owned it... These are the pics the original owner sent me when I responded to his CL ad


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