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te4250

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About te4250

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    TT Bronze Member

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    New York
  1. te4250

    83 xr500r running rich

    I doubt its any type of air leak as that would make it lean and especially with leaner than stock main jet. Ill check quick with a spray can in any case. The only thing I thought could be happening is that the second carb isn't closing all the way or somehow leaking a bit of fuel to the motor. I don't have much time soon but maybe Ill just swap back to the other carbs and see what happens. Thanks for the help
  2. From what Ive read 6061 doesn't naturally age like other aluminum alloys until its solution heat treated. Once you heat it enough to change the solution structure, like you do when you weld it, it goes straight to T0. To get any type of strength out of it then it has to be heat treated. Also all the analysis I've run has been for T6 and it was cutting it close at that ( safety factor of about 1.1 ) so I want the strongest temper I can get.
  3. te4250

    83 xr500r running rich

    Ill take a look at the ACV. The numbers on the carb are 50A then a symbol that looks like a boxed A then VB then a symbol that looks like a small capital delta. The carbs I took off read 50A the same symbol VA then a symbol that looks like the left half of a rectangle. What do the numbers mean, should I clean up the first set of carbs and put them back on? Thanks for the help and sorry for the bad symbol descriptions lol
  4. It started out as T6 which just happened to be the temper of the cheapest stuff I could find in the right sizes. I have yet to actually heat treat them but to return the annealed metal all the way back to T6 it has to be quenched in room temperature water from ~975F, then it has to be artificially aged which is just holding it at ~300F for around 12 hours I believe. Don't quote me on the numbers but they're fairly easy to find. Just the quench ( Solution heat treatment ) gets it back to T4 I believe then the artificial age brings it up to T6. This is all 6061 specific by the way.
  5. Thanks for the responses and sorry I haven't been checking TT for a while. I was actually wondering if anyone knew specific alloys that the manufacturers use as I was in the search for the cheapest/easiest/strongest aluminum alloy to make suspension components out of (control arms, ect). I ended up using 6061 welding with 4643 filler rod and doing a post weld heat treatment.
  6. te4250

    83 xr500r running rich

    Hey guys, I bought an 83 XR500R back in august and have been riding it everywhere since then ( street legal! ) but its been running really rich the whole time, just on the pilot though. It runs great everywhere else just idles pretty rich. I finally bought some jets for it to lean out the idle and just today worked down from a 55 pilot to a 48 with no change. 48 was the smallest pilot I bought for it and at this point it seems its idling rich for another reason. Anybody have any ideas? It ran much leaner when I got it but I switched carbs ( PO gave me two sets ) and cleaned the second set out/mix matched some parts to get the combination in the best condition. All jets are the same as when I got it ( before I changed pilots ) and both needles are in the same ( stock ) position. The carbs were fairly dirty and I blame that for the initial lean condition. Sorry for the long post and thanks for any responses
  7. Does anybody know the alloy or alloys they use in aluminum swingarms and frames nowadays. It seems like there's alot of weld on them so either its an alloy such as 7005 that doesn't anneal or they heat treat the whole thing after welding or just design it for the decrease in strength. In any case they're using it so it must be fairly cheap and still lighter than steel. Anybody have any idea?
  8. was that also around when they were taking lead out of the gas? That lowered the octane quite a bit calling for lower compression engines
  9. te4250

    1988 YZ490 Resto..... Work in Progress

    I don't know. I searched for specs on it but didn't find anything regarding frame material. If its anything harder than mild steel though welding it to the table will anneal it in those spots. Maybe someone on here knows what it was made of. Either way its probably better just to clamp it. Sucks about your carb though. I've done that before and was pissed. It doesn't take much on some carbs.
  10. te4250

    1988 YZ490 Resto..... Work in Progress

    That frame isn't chromoly is it. If it is you should probably clamp it to the table.
  11. te4250

    02 YZ250 Crank

    Yeah I was thinking the crank being out of true or balance would be giving me the vibrations.
  12. Looks good can't wait to see it all done. Did you run over the welds on the pipe with a torch to bring back the oxidation?
  13. te4250

    02 YZ250 Crank

    Yeah the one that came out of it was a wiseco that was in there since I had the bike (~4 years). Just it never vibrated like it does now. It is minor though and not noticeable while riding so hopefully I'm fine
  14. te4250

    02 YZ250 Crank

    Its not the main bearings I'm worried about. One of the wiseco cranks actually snapped in half in the kx forums, another locked up the big end and and the needles that feel out punched holes in the cases. I know the mains are the same but how about the needle bearing. Not that that matters either if the crank just snaps in half.
  15. Sorry I know this is an old topic now but when you register them there do they give you a new title that doesn't say offroad use only.
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