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Old Thumper Driver

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About Old Thumper Driver

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  1. Old Thumper Driver

    2005 CRF450 near impossible to start/no idle

    I agree with most. Idle jet is clogged. Been through this a bunch of times on various bikes. If the carb will rotate, it is pretty simple to pull the idle jet out and clean it. I live too far from civilization to replace them every time so I came up with a cleaning method. Get the jet out and cut a 6" piece of monofilament fishing line that will fit in the tiny hole. Use that to push the blockage out then take another piece of monofilament the same size and chew on the middle of it with your teeth to make it all bumpy. You could use the same piece but gas tastes nasty. Wipe the saliva off and pull the bumpy section back and forth through the idle jet passage. If you get the line diameter right, it will be a bit difficult to pull the bumps through. It cleans it nicely, without scratching the bore.
  2. Old Thumper Driver

    1983 XL600R valve rocker dilemma

    Thanks, S.O.A.N.Z. Some good prospects and great information I didn't have.
  3. Old Thumper Driver

    1983 XL600R valve rocker dilemma

    It seems that the A rocker arm for these beasts is rare. Mine is dished out, where it rides the cam. Oil supply problem? Anyway, the OEM number is 14431-MG3-000. Occasionally, I find a part for sale, numbered 14431-MG3-040, saying it fits this bike. One even says that the 040 was previously the OEM, 000 number. Most sellers say 040 will not fit the 83 XL600R. Anyone have any experience with this?
  4. Old Thumper Driver

    2000 YZ 426 ignition

    Yep. The old one is a '76 TT500 and its point set is on the right case, with a reduction gear between it and the main drive gear. Thanks again.
  5. Old Thumper Driver

    2000 YZ 426 ignition

    Thanks, Nuity5. I never would have thought of that. Old school is hard to shake. My other dirt bike still has points and two rear shocks.
  6. Old Thumper Driver

    2000 YZ 426 ignition

    I am replacing the lower casings on the bike. My question is, when it's all back together, how does the CDI know when to fire the plug? I see the sensor next to the flywheel and assume that is where the signal comes from but the flywheel rotates twice for each time the plug should fire. How does it know which time to trigger the spark?
  7. Old Thumper Driver

    Transmission innards

    Thanks, Grayracer. I was hoping you would chime in.
  8. Old Thumper Driver

    Transmission innards

    Thanks, Jojo.
  9. Old Thumper Driver

    Transmission innards

    Got a 2000 YZ 426 with a chain-induced crack by the clutch actuator. Can't get it stopped with JB Weld so I bought a pair of used cases. The manual says, after taking it down to just the cases, that the right case will come off without a puller, then remove the innards and push the crank out of the left case. The removal and installation of all those innards has me nervous. Would it be wrong, once the right case is off, to place the new right case on the assembly, turn it onto the right side, pull the left case off the crank and install the new left case?
  10. Old Thumper Driver

    Euro carb on a US YZ 426

    Thanks, Grayracer. I'll put in new jets today and see what happens. Needle next if it still acts funny.
  11. Old Thumper Driver

    Euro carb on a US YZ 426

    Anybody know how much difference there is between a 5JG 1 (US) carb and a 5JG 2 (European) carb? Bought the 2000 YZ 426 cheap, not running, and previous owner said he broke the corner off the original carb, where the bowl mounts, so he got one off Ebay. It ran before that. He didn't do anything to the Ebay carb, just gave up and sold the bike. I'm just starting on it, with all new jets, needle and seat, etc. but found out the 5JG 2 is standard in Europe. I can't find any differences and am planning on trying to set it up the same as I would the original.
  12. Old Thumper Driver

    XT 500 Parts

    Babbit's Cycle and Ebay.