Project Cheap Bast'd CR125R

Discussion in '2 smokers' started by Seavoyage, Dec 31, 2012.

  1. Seavoyage

    Seavoyage Been here awhile

    Joined:
    Dec 20, 2011
    Oddometer:
    133
    Location:
    San Francisco
    Anyone with similar projects to inspire us for 2013?

    Note: If a '96-'01 Green sticker eligible 6-speed YZ125 was available for a similar price, we would have considered it over the CR125.

    We did not want to go nuts with mods like most Magazine 'Budget Builds' that raise the project cost from $500 to a ridiculous $6149; :deal here's a link to the Motorcycle USA CR125 Craigslist Killer Project and a comparison against a 2011 YZ125:


    <iframe src="http://www.motorcycle-usa.com/1190/Motorcycle-Embed/2003-Honda-CR125-Craigslist-Project.aspx" id="MotorcycleUSAVideo" title="2003 Honda CR125 Craigslist Project - Motorcycle USA Video" scrolling="no" width="670" frameborder="0" height="650"></iframe>

    <iframe src="http://www.motorcycle-usa.com/1191/Motorcycle-Embed/2003-CR125-vs--2011-YZ125-Video.aspx" id="MotorcycleUSAVideo" title="2003 CR125 vs. 2011 YZ125 Video - Motorcycle USA Video" scrolling="no" width="670" frameborder="0" height="650"></iframe> ​

    We took the opposite approach - Keep it simple (K.I.S.S.) and not go overboard. This is Project Low Bucks! :lol3 We held a yard sale, sold a bunch of spare parts, useless farkles, and used riding gear on CraigsList to raise the funds to purchase this 1997 CR125R also listed on Craigslist. We've kept the project budget under $1000 before the first 50-hrs. top-end rebuild.

    We didn't want to be wrenching - we had to go riding!


    [​IMG]

    @ tjanson - Since you insist... Mods?

    Priority 1: Mechanically sound; maintenance: nuts & bolts tight, spoke checks, oil changes, air filter, top end, clutch pack (with steel plates), brake pads, bearings, sprocket/chain, linkages, lubes, bled brakes,... DONE!

    Went 2-teeth up on rear sprocket 51/14. Jetting seems fine for trail riding. Experimenting with 50:1 vs recommended 32:1. Using Castrol Power RS TTS Synthetic 2-stroke Oil at $11 per Liter from Powersport Superstore.com Enough for 6 tanks of gas, and No splooge!

    Found discount and close-out deals on BikeBandit , RockyMountain ATV-MC, or Chapparal. Running Dunlop MX51 for now, then I'm back to Pirellis. Trials tires aren't made for 19" rims: besides it's too much grip for a 125cc... you gotta break loose. According to Eric Gorr: HD clutch springs not recommended on 125cc. Replaced OEM with steel clutch plates. Here's a link to Eric Gorr recommended engine mods for the 1997 CR125R. All Balls Wheel Bearing are under $20 each set. Maxima Pro Air filter $8.96. Parts Unlimited levers for $4

    Discovered $45 Tusk clutch kit; $75 Primary Drive Sprocket and O-ring chain kit; and $72 Pro-X Piston kit or may try $49 Namura piston kit. OEM pistons are cast, manufactured by ART (Japan) and marketed as Pro-X. Namura hypereutetic cast pistons are made by ART (Taiwan). Wiseco is forged.

    These parts should hold up for at least 50-hrs. $4/Qt. ATF-F or Shell Rotella T-3 works! (2 Qts. = 3 oil changes at 650cc transmission case volume; oil changes every 5-hrs.).

    Priority 2: Suspension: Set-up for B Enduro 150 lbs. rider: the bike had the correct fork and shock spring rates based on static/race sag measurements. Changed fork-oil (5W and dropped oil level to achieve 130mm air gap), Tusk Forks seals $13/pair, set rear preload; and messed with the clickers to soften up for off-road. DONE!

    Priority 3: Armor! Handguards, skid plate, pipe guard, disc guards, brake-snake, safety wire. All used from other projects, eBay or CraigsList. DONE! Postpone a bit for radiator guards.

    The CR125 already came with a ProCircuit pipe and silencer, Moto Tassinari VForce3 Reed Block, and fresh Dunlop tires. New plastic, One Industries graphics and seat cover. IMS Super-stock foot pegs.

    5-hrs on HotRods crankshaft assembly with Pro-X conrod, and Vertex piston. The frame was completely disassembled and powder coated black. Linkages/bearings all checked out. Clutch, brake rotors are all within spec. I replaced the front brake pad.

    Found a Clarke 3.1 gallon tank through CraigsList: = $20 :eek1

    We'll see if a flywheel weight is worth it. Nah! We're done screwing around; we just ride the hell out of this bike
    #1
  2. dentvet

    dentvet Long timer

    Joined:
    Aug 4, 2008
    Oddometer:
    1,376
    Location:
    hunt country virginia
    I'm a cheap bast'd too.

    i have a Beta rev3 trials bike for the tight stuff here as per your other thread. the motor is so sweet that i am considering making a hybrid which might get me the best of all worlds. full suspension, ergonomics and brakes with all that tork. Obviously will be giving back weight, turning quickness.

    here's my lonely chassis:

    [​IMG]

    I'm looking for a Beta or rotax 2 stroke mill for the hybridization
    #2
  3. Seavoyage

    Seavoyage Been here awhile

    Joined:
    Dec 20, 2011
    Oddometer:
    133
    Location:
    San Francisco
    @ dentvet

    If I had a Beta REV3 this would be the first mod: http://www.trialsnuts.com/BetaLRK.htm

    [​IMG]

    Followed by fork/shock revalving for heavier G-outs (The springs are fine). I figured this out since I often take my GasGas on a MX track. I need to be careful with so little rebound and compression dampening: When I get too much air I've pogoed right off the track or over the bars, and have blown a fork seal.

    Swap out sprockets to get close to 3.64 ratio in 6th gear.

    The Italians have figured it out:

    <object><iframe src="http://www.youtube.com/embed/naM41AjdO6o" allowfullscreen="" width="560" frameborder="0" height="315"></iframe></object>​

    but outside the Cheap Bast'd budget.

    Here's another specimen I worked on earlier this year: Sorry it's a damn 4-stroke!

    Addendum: Sold all the extra parts off to recoup the cost of what I spent. Found a $50 FMF Ti-4 can from a WR450F which fit after I modified the mid-pipe. Added a FMF Quiet core to get below the 96dB sound restriction.

    Bit the bullet and got a TM-33 carburetor from CarbPartsWarhouse and a bunch of jets; Called Jesse @ KeinTechfor a baseline recommendation; after a week of plug chops, she now starts right up!

    AND performed flawlessly on the AMA D-36 300 mile SheetIron Dual Sport Ride; and the D-37 LA-Barstow-Las Vegas event!

    She's now owned by a good friend who's very happy. We're currently transplanting a '94 RMX250 front end (Cartridge forks) I found for $150; and now run a Pirelli MT43 trials rear tire. We also found a DR350 motor- so a 441cc Overbore may be in the works.

    =====================

    Here's Super Hunky's spin: Start: $100 - End: $243

    [​IMG]

    Additional resources:

    Project Lowbucks: Buying a Dirt Bike for Dirt Cheap
    by Super-Hunky
    http://www.off-road.com/dirtbike/pr...-buying-a-dirt-bike-for-dirt-cheap-53319.html
    http://www.off-road.com/dirtbike/pr...ng-a-dirt-bike-for-dirt-cheap-pt-2-53342.html
    http://www.off-road.com/dirtbike/pr...ng-a-dirt-bike-for-dirt-cheap-pt-3-53358.html
    http://www.off-road.com/dirtbike/pr...g-a-dirt-bike-for-dirt-bike-part-4-53369.html
    http://www.off-road.com/dirtbike/pr...-a-dirt-bike-for-dirt-cheap-part-5-53397.html
    http://www.off-road.com/dirtbike/pr...ilding-a-dirt-bike-dirt-cheap-pt-6-53410.html

    Kawasaki KDX 200 Refresh
    http://www.off-road.com/dirtbike/pr...1-renthal-bars-sprockets-and-chain-53222.html
    http://www.off-road.com/dirtbike/pr...is-hand-guard-and-plastic-upgrades-53275.html
    http://www.off-road.com/dirtbike/pr...t-3-seat-cover-exhaust-pipe-repair-53302.html

    MX Trail Bike: Giving a Motocross Bike New Life

    http://www.off-road.com/dirtbike/project/mx-trail-bike-giving-a-motocross-bike-new-life-53373.html
    http://www.off-road.com/dirtbike/project/mx-trail-bike-fuel-armor-upgrades-53412.html
    http://www.off-road.com/dirtbike/project/mx-trail-bike-adding-more-torque-traction-53471.html
    #3
  4. dentvet

    dentvet Long timer

    Joined:
    Aug 4, 2008
    Oddometer:
    1,376
    Location:
    hunt country virginia
    hey I like your craigslist skills..

    i didn't realize that the trials suspension was that amenable to conversion. Did you revalve your gas gas yourself? I need to find a thread on Paioli tuning for my Beta.

    I had a long ride seat for it but didn't think I needed the range for it. Plus it was tying up about $350 in play money:D

    [​IMG]

    Thanks for the gearing tip, you obviously have this stuff figured out.
    #4
  5. Seavoyage

    Seavoyage Been here awhile

    Joined:
    Dec 20, 2011
    Oddometer:
    133
    Location:
    San Francisco
    Craiglist Blue Light Special: http://sfbay.craigslist.org/sby/mcy/3518942632.html

    $200

    [​IMG] [​IMG]

    [FONT=verdana,arial,helvetica]BTW - I checked it out a few hours ago. The Title is clean, and[/FONT][FONT=verdana,arial,helvetica] except the front wheel (available on eBay for $40[/FONT][FONT=verdana,arial,helvetica]) it looks like it's all there. [/FONT][FONT=verdana,arial,helvetica]It's a wide-ratio tranny which I did not test. The cylinder wasn't scuffed, but I didn't take [/FONT][FONT=verdana,arial,helvetica]measurements. It comes with an extra Pro-Circuit pipe, Devol disc and rad guards, skid-plate, and large capacity fuel tank. It needs a Top-End rebuild: ~$100, new tires w/ tubes; about 2-hrs of elbow grease, and a six-pack (of fluids, not abs) to put this one together. You can probably get street plates for this WR250; and please don't ask me how I know. Any takers? You won't even need a truck to transport it since it'll all fit in a SMART car.[/FONT]

    Need something more 'Turn-Key' and less IKEA 'Some Assembly Required'?
    #5
  6. tjanson

    tjanson Adventurer

    Joined:
    Mar 17, 2011
    Oddometer:
    26
    Location:
    Burlington-ish, Vermont
    Awesome, thanks for the info.

    My ride was a craiglist special last winter, #1/cc for a non-running KLR 250. Ended up rebuilding the engine, still came out pretty cheap. Gets the job done, but it's of course more of a dual sport than an enduro. I love the idea of a 200lb 2 stroke for whipping around. It's really easy to plate dirt bikes in VT...so no trouble there.

    So what's your evaluation of your Honda vs. the Husky? Have you had a chance to ride the Husqvarna?
    #6
  7. Seavoyage

    Seavoyage Been here awhile

    Joined:
    Dec 20, 2011
    Oddometer:
    133
    Location:
    San Francisco
    Epilogue: Sold the CR125R to fund a current KTM200MXC "Cheap Bast'd" project.

    The new owners ran the CR125R without pre-mix oil; damaged the piston; then traded it to the current owner for a pool-table. The CR125R was last seen listed on CL after a Namura piston replacement by the current owner for $1500: http://sfbay.craigslist.org/eby/mcy/3843190452.html

    [​IMG]
    #7