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deweym21

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About deweym21

  • Rank
    TT Bronze Member

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  • Gender
    Male
  • Location
    Kansas
  • Interests
    Track Days, Touring, Sport Touring, Dirt, Supermoto

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  1. deweym21

    Hydro locked engine

    First of all if you can't kick start a bike and think you need to "bump start" it, something is wrong. It might start but you could be forcing moving parts to move that could be in a bind to move. The "weep hole" is there to drain anything out of the spark plug compartment so that it won't soak in any liquid that could get in there. You will know if you have a hydrolocked engine if you pull the tank off and get access to the spark plug and remove it. If you do that and discover that it's full of antifreeze let's just hope you have a head gasket that's leaking. Otherwise there could be a crack, severe catastrophic failure, or something that's fixable cylinder head warpage causing the gasket not to seal. These are few things that come to mind.
  2. One way to find out take the valve cover off. Pro tip remove the spark plug so you don't end up stripping out your crankshaft thread fighting What compression that is there
  3. deweym21

    426f replacement

    I sure hate to hear about an older Thumper going down into pieces. are you sure there's no way you can salvage some components from your engine and piece Her back together from some parts online? If not this is a good lesson to make sure and stay on top of your service of your top end of whatever it is that you ride. Wishing you the best of luck
  4. deweym21

    426f replacement

    I don't know why that wouldn't work. Man they aren't giving it away though! Hardycad not knowing what the condition of the top end of this engine is in if your jug is repairable by means of boring and replating you potentially could use it and do a top end on this engine if you had it repaired but by using a piston that will fit on the 400 Rod which is a different diameter wrist pin than the 426. Look up 426 conversion the easy way. either way it looks like it's going to be expensive for you and I'm sorry about that.
  5. deweym21

    426f replacement

    Engine mounts are the exact same. Everything bolts up the same. there may be some differences at the carburetor jetting and may have to plug or rout a hot start Port on the head of the 400. There is not one on my 426, but my 400 has one.
  6. deweym21

    426f replacement

    Are you saying that you destroyed your top and bottom end? You can use the the head off of any of the 98 and 99 400s and 2000 through 2002 426s note that the 2001 and 2002 have titanium valves the rest are steel. The 426 rod has a different diameter at the Piston attachment point then the 400 engines the Piston is 92 mm for the 95 mm for the 426. If you were able to find a complete 400 engine you could put it into the 426 frame and vice versa. Some people have used some of the 5 valve 450 pistons on the 400 rod to be able to run the 426 cylinder. There are some posts on this forum about that conversion if I remember correctly it's called 426 conversion the easy way. I have had a lot of fun doing a lot of the different things you can do with these bikes just trying to learn something before I buy a newer bike. I had bought some different cases complete with the crank to harvest the Transmissions because they were both WR models. I do something stupid and run my supermoto on the road-race courses and I want that top speed. My bike is a 400 and I picked up a 426 engine in pieces and built it up where I wanted it and installed it into my bike and rebuilt my 400 engine back stock and I have it on standby in case it's something crazy happens but it is also has a wide range tranny on it. There are some differences in the cases between the 400 and 426 but they are very subtle and I think there's a form on that as well. You can get parts here and there for them in case you pick up an old beat-up engine and plan on doing the max maintenance to them bearings and all and you should have something somewhat stable. I have 2 WR 400 cases that may be missing a couple of parts that I'm looking at right now in my shop, the ones that I harvested the Transmissions from. The parts are out there and sometimes they are posted on eBay and other places sometimes they go fast sometimes they hang out for a while and they're carried conditions. Please reply or inbox me if you have any comments or questions about some of these things I hope it's been helpful to you
  7. deweym21

    00' yz426f won't start

    Additionally there is a spring associated with that decompression lever that needs to be properly in place so that it releases the decompression mechanism perhaps it is not sprung causing it to hold itself open
  8. deweym21

    00' yz426f won't start

    It sounds like you're on the right track. I bet those valves are very tight and need shimmed. That's one of the reasons so many times for a tough start.
  9. deweym21

    00' yz426f won't start

    First of all I think what is most important is to keep focused on getting your machine running properly again. The cam that is in your bike unless it is damaged which it shouldn't be isn't costing you any money. It would be a real bummer to spend a bunch of money on all this other stuff and your machine still isn't running right because of a different issue
  10. deweym21

    00' yz426f won't start

    If I was going to buy one I would get a nice new hot cam mine have the 450 cam in it and it works just fine but if you're going to buy one why not buy the one that is made for your machine
  11. deweym21

    00' yz426f won't start

    Those work on the 98 + 99400 + 2000 through 2002 426 but like I said the timing takes a little bit of extra effort. Additionally be teeth on the sprocket on that cam or slightly different although they work and I've even used one but recently upgraded to the hot cams made for my machine
  12. deweym21

    00' yz426f won't start

    Something that you may want to consider is getting a shim kit. mine is Hot Cams and what they have is an assortment of shem's that you may need instead of getting a sham realizing what one you need and then ordering it or having to go to the store and then realizing that you need that a different one after you cycled it over a few times. This way you have all of them that you need when you're making an adjustment.
  13. deweym21

    00' yz426f won't start

    Answer to both questions,. You can do it at home if you are mechanically inclined rockymountainatvmc has some good how to videos but it's probably also a good idea to download a manual for it just so you have a backup and double and triple check your work. A lot of people used to plug their decompression hole but I just put mine back in there and don't use it.
  14. deweym21

    00' yz426f won't start

    Yes you can but get out your wallet it's the replacement of the exhaust cam about $150 from Rocky Mountain if I recall correctly. That is the hot cam. Before they came out with those for these bikes they used to use the 450 cam when they came out with the stock Auto decompression. Those have a certain timing that go with them the 450 cam but it can be done but if you get the cam for your bike you just line up the timing marks and you're good so that's probably the best thing to do. They give you a little bit of performance and yes I do recommend it.
  15. deweym21

    00' yz426f won't start

    It sounds like it would be a very good idea for you to get your feeler gauges out and do a valve clearance check and see if you got a problem with clearances. At this particular point you can also see if you have a valve that's trying to stick open on you. These older bikes are beasts but sometimes they need some TLC to get him running as good as they used to good luck and please update when you find out what your results are.
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