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Found 14 results

  1. I have recently rebuilt a 1979 YZ 400 F. The only way I've been able to start it is by squirting some fuel in through the spark plug hole. Once I get the bike started it runs and rides perfectly. All of the jetting is the same as in the manual. Hopefully there is someone out there who can shed some light on my starting difficulties. Christopher
  2. Hello YZ 400/426/450 Owners, Bailey here with Baja Designs. We recognize ThumperTalk as one of the go-to sources for information on the Yamaha YZ 400/426/450. We would like this thread to be a General Discussion area for members and guests to discuss Dual Sport Kits (DSK), Lights, and Lighting Acessories based upon stock and modified charging systems. Please Post up if you have any questions or comments YZ 400/426/450 related! Thanks!
  3. 0 comments

    WHAT. A. MONSTER.
  4. 0 reviews

    MOTORCYCLE TYPE Moto Cross ENGINE SPECIFICATIONS Displacement (cc): 398 Cylinders: 1 Engine Stroke: 2 Speeds: 5 Speed TRANSMISSION SPECIFICATIONS Number of speeds: 5 Speed Dry Weight (lbs.): 262
  5. 0 reviews

    MOTORCYCLE TYPE Moto Cross ENGINE SPECIFICATIONS Displacement (cc): 398 Cylinders: 1 Engine Stroke: 2 Speeds: 5 Speed TRANSMISSION SPECIFICATIONS Number of speeds: 5 Speed Dry Weight (lbs.): 262
  6. 1 review

    MOTORCYCLE TYPE Moto Cross ENGINE SPECIFICATIONS Displacement (cc): 398 Cylinders: 1 Engine Stroke: 2 Speeds: 5 Speed TRANSMISSION SPECIFICATIONS Number of speeds: 5 Speed Dry Weight (lbs.): 262
  7. Got a new problem. Just rebuilt carb, reinstalled carb, had to take of cam adjustment piston and didn't know how to put that back together. Now, the kick lever freely kicks without having to pull tune compression clutch lever
  8. I am an old school dirt rider who has been out of the game for a decade or so. I decided to begin riding again so I found a 98 YZF 400 locally that I purchased for 500.00. The guy was up front about issues with the bike which include, no idle, will not kickstart cold - must bump start, bogs out when throttle is dumped (accelerates fine when throttle is applied slowly). He is telling me that the center intake valve is bent and is causing these issues. Although I have been out of the game for awhile, its been my experience that when a valve is bent, the engine wont run at all. This bike runs well, VERY well actually minus the idle and starting issues (lots of power, awesome acceleration). How would any of this be possible with a bent valve? I havent had the time to break the engine down yet but I wanted to get a few opinions on here before I even begin down that road.
  9. So I rebuilt my carburetor and had to remove a piece because it was just being that much of a pain. When putting the piece back in and tried to kick the bike over, the kick start lever won't rotate to compress. The piece shown was removed and presses against a plate in front of carborator. Could some one help with reinstall process?
  10. 0 comments

  11. My buddy has a 01 yz426f and he wheelied over backward and bent his slip on badly. Were trying to find a cheap replacement but they are all expensive. Even used stock ones. So i thought maybe a slip on from a 250 or 450 might fit. Does anybody know of any interchangeable slip ons? Or know of any cheap slip ons? Thanks in advance Mike
  12. 0 reviews

    MOTORCYCLE TYPE Moto Cross ENGINE SPECIFICATIONS Displacement (cc): 398 Cylinders: 1 Engine Stroke: 2 Speeds: 5 Speed TRANSMISSION SPECIFICATIONS Number of speeds: 5 Speed Dry Weight (lbs.): 262
  13. What have you done to your bike today? i got bored and decided to polish my clutch cover and re-pack my DRD.
  14. Hey all, I recently bought I sort of frankenbike yz400. I believe it's anywhere from the late 70's to late 80's. Anyways I've been having carburetor problems and a thorough cleaning didnt do much. I'm just curious about what might be compatible as a replacement carb as I don't know specifically what to look for.
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