Jump to content

MxJeffB

Members
  • Content Count

    53
  • Joined

  • Last visited

About MxJeffB

  • Rank
    TT Member

Profile Information

  • Location
    Texas
  • Interests
    MTN biking, motocross Jet & watersking
  1. MxJeffB

    Best Looking Yz450f!!

    Thanks, its better then new
  2. MxJeffB

    Best Looking Yz450f!!

    Just finished up my frame up rebuild of my 08 YZ450f
  3. MxJeffB

    Pics of your 06-09 yzf 450

    I just finished my frame up rebuild of my 08 YZ450f
  4. MxJeffB

    Crf150r Expert or the Cr85

    The first thing to ask your self is what riding are you doing. All out Racing, local racing,trails or just play riding. The 4-stroke for all out racing because that will be the only way to stay with the fast guys that will be on the 4-stroke. Local racing,Trail or fun riding an 85 would be fine and getting a good used 2-stroke would be good because they are cheep. You can use the extra money for up keep on the bike. You need to put more info on the kind of riding you plan on doing for people to give good help.
  5. MxJeffB

    whats so bad about lifan engines

    I have 34 hours run time on a built lifan motor and have had no problem.
  6. MxJeffB

    Jetting after new pipe

    Yes, it will hit the rev limiter even faster with the new pipe. I will check out the sticky thread for ajustments. Thanks
  7. MxJeffB

    Jetting after new pipe

    It ran clean from bottom to the top end. With the new pipe it feels a little flat on the bottom and pops when chopping the throttle. Doing a plug check shows a little lean on top end. vary light brown going to white.
  8. 03 crf450 with a new yosh pipe. Do I need to do any jetting changes just changing to a new pipe?
  9. Did you use the stock valve springs? If so I would say you should get the dratv springs to go with the race cam. With three heads that I have put the dratv race cam in the cam has to much lift for the stock springs. Just some info you should have
  10. Most all the parts came from ebay The bike build sheet We started with a brand new 99 xr70 for my son when he was 5 years old and worked on the bike as needed. He is now ten and his riding buddies all have ktm or rm 65's but he loves his bike and likes to build his bike rather than buy a new one. (He loves pit bikes) With that said here is are build as of now. Stock xr70 frame with top shock mount made for a ktm 65 shock. 02 xr70 plastic's and gripper seat cover. Pro taper bars. BBR top clamp Forks are 05 crf100 that I cut down top tube 3in. I made long travel damper rods with short top out bumpers making 8in of travel. The damper rods I put smaller oil flow holes so that I can use 5wt oil. Most people use 20wt to slow the forks but the oil stays at the top of the fork around the spring and takes to much time to travel back down to the bottom of the fork making air cavation in the damping. The more travel of the fork made me need more oil than the top fork tube could hold when fully bottomed. I made two canisters on each fork that fit between the triple clamps that I made two holes in the fork tubes for the oil to go in and out. I can put the oil height real high to Keep the damper rod covered with oil at all times and the 5wt oil flows back down faster. Springs are crf80. The rear swing arm is a staggs that is 16inch, I reworked the shock mount to make it the same as the KTM set up. The shock is a KTM 65sx with compression and rebound adjusters. We have tested the suspension and made changes to the forks the springs and valving on the shock and have the bike working vary well. The motor is now a Lifan 120cc monster head The head I cut the ID of the valve seats to the max, ported and matched all the intake. High compression piston 12:1 Dratv z40 cam and matching valve springs. Keihin PE 24mm carb with Uni filter Kitaco inner-rotor Two Brothers pipe Skid plate I made 1 ½ in peg extensions for more legroom and reworked the rear brake pedal. I made a longer clutch arm on the motor for a lighter pull. This motor pulls hard and my son is able to keep up with his buddies on the two smokes 65s The next up grade needs to be disc breaks.
  11. This is my good deal bike for my 6 year old girl. I have $245.00 into it. http://i30.photobucket.com/albums/c329/mxjeffb/kyliesbike.jpg
  12. MxJeffB

    pics of 70s

    The fork covers are just for looks, I just don't like the look of long travel fork with the small 27mm upper tube. Build sheet We started with a brand new 99 xr70 for my son when he was 5 years old and worked on the bike as needed. He is now ten and his riding buddies all have ktm or rm 65's but he loves his bike and likes to build his bike rather than buy a new one. (He loves pit bikes) With that said here is are build as of now. Stock xr70 frame with top shock mount made for a ktm 65 shock. 02 xr70 plastic's and gripper seat cover. Pro taper bars. BBR top clamp Forks are 05 crf100 that I cut down the top tube 3in. I made long travel damper rods with short top out bumpers making 8in of travel. The damper rods I put smaller oil flow holes so that I can use 5wt oil. Most people use 20wt to slow the forks but the oil stays at the top of the fork around the spring and takes to much time to travel back down to the bottom of the fork making air cavation in the damping. The more travel of the fork made me need more oil than the top fork tube could hold when fully bottomed. I made two canisters on each fork that fit between the triple clamps that I made two holes in the fork tubes for the oil to go in and out. I can put the oil height real high to Keep the damper rod covered with oil at all times and the 5wt oil flows back down faster. Springs are crf80 and one BBR HD. The rear swing arm is a staggs that is 16inch, I reworked the shock mount to make it the same as the KTM set up. The shock is a KTM 65sx with compression and rebound adjusters. We have tested the suspension and made changes to the forks the springs and valving on the shock and have the bike working vary well. The motor is now a Lifan 131cc monster head The head I cut the ID of the valve seats to the max, ported and matched all the intake. High compression piston 12:1 crowerpower cam and matching valve springs. Keihin PE 24mm carb with Uni filter Kitaco inner-rotor Two Brothers pipe Skid plate I made 1 ½ in peg extensions for more legroom and reworked the rear brake pedal. I made a longer clutch arm on the motor for a lighter pull. This motor pulls hard and my son is able to keep up with his buddies on the two smokes 65s The next up grade needs to be disc brakes. My son was a part of this build all the way. http://i30.photobucket.com/albums/c329/mxjeffb/100_1267.jpg http://i30.photobucket.com/albums/c329/mxjeffb/100_1266.jpg
  13. MxJeffB

    pics of 70s

    My sons bike http://i30.photobucket.com/albums/c329/mxjeffb/100_1272.jpg http://i30.photobucket.com/albums/c329/mxjeffb/100B1411.jpg
×