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Mike_80

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About Mike_80

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    Texas

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  1. Mike_80

    07 cr250 tech advice

    So where did the missing chunk go? Did you not ever find it?
  2. Mike_80

    07 cr250 tech advice

    I’m kind of curious about this Vertex piston. Does anyone know why the cut out is there? Intentional design or some type of failure? I have a buddy with a new KTM 125 that now has a ruined cylinder because the stock Vertex piston skirting broke off. I assumed KTM wouldn’t use a junk piston so just wondering what knowledge is out there on it.
  3. Mike_80

    Coolant in piston chamber

    When I read his post I was thinking the same exact thing.
  4. Mike_80

    97 CR125R Cylinder problems!

    Yeah im going to split my cases and do a full inspection also. From everything I’ve gathered so far it looks like mine was running way too hot but I haven’t figured out why yet. I’m shutting it down for a while (been spending too much $$$ lately) but when I finally get back to it I’ll let you know if I find anything useful.
  5. Mike_80

    97 CR125R Cylinder problems!

    Looks a little familiar. I haven’t started inspecting mine yet but if I ever figure out the cause I’ll update my post. I’m a little hesitant to just rebuild it without really understanding what caused this first. If I were you I’d torque the head back down and do a leak down test first before dismantling anything.
  6. I’ll never do it again. I’ll just take the loss instead. It took up way too much of my time which to me is worth considerably more than I can make back. This is a $10/hr job. And the margins are not great. Selling a lot of items like that in general on EBay is very time consuming just to clean, take pictures, upload pictures, create ads, find appropriate packaging, package the items carefully enough, travel to the post office, etc. Then, you will have to put up the money for shipping. Then, EBay takes 10%. You can sell a few of the items on Craigslist but not many because you won’t find a lot of local shoppers ready to buy your specific parts. It’s a long, frustrating ride that I won’t take again. With that said, there are people that have built a business doing this but it’s clear to me they have systemized all of these processes on a large scale as to leverage economies of scale and thus can pay employees to keep product flowing in and out.
  7. Mike_80

    Damaged Cylinder Questions

    Yes of course I’m going to split the cases and thoroughly clean and replace bearings, etc. I’m just wondering if a new cylinder needs prep before using. I understand the concept of checking the squish band but not familiar with tools/materials to use or even the proper procedure.
  8. Mike_80

    Damaged Cylinder Questions

    Anyone know the answer to my question #3?
  9. Mike_80

    Damaged Cylinder Questions

    Thanks for the input. Yes, I realize we’re taking about carb settings and fuel/air mixture and not fuel/oil ratio but I just wanted to note my premix setup. Regardless I’m still confused on how I had spooge if it was running THAT lean. I realize that I could have an air leak but I keep this bike in fantastic condition, my carb jets should not be clogged and the crank seals barely have any use on them. I’m still going to do a leak down test but man this is frustrating.
  10. Mike_80

    Damaged Cylinder Questions

    I’ve always run 32:1 Pro Honda, no changes there. I like your idea to do the leak down test before I tear it down, I hadn’t thought of that, good idea. My last top end rebuild (only got one race out of it so this was very recent) the plug looked slightly lean so I bumped up the main to the 410 that’s in it now and it looked fantastic after that. And I’m pretty sure I just reused that same plug. So jetting may have been good for that top end but I was also having issues with leaking head gaskets so who knows.
  11. Mike_80

    Damaged Cylinder Questions

    The spark plug is correct, it’s a 9. So you suggest I replace the crank bearings along with the seals? What about the crank itself? It’s strange that there was spooge running out when it’s showing signs of too lean. Also I’ve been running this jetting for a while already, since the weather first turned cooler. With that said though I have been having issues with my cylinder head leaking and should have resolved that on this last top end rebuild so I still think it’s entirely possible that all the sudden the jetting was too lean, just don’t understand why the spooge if so. Jetting settings are: P-32.5, M-410, N- JD red on 2nd, AS-3 Weather yesterday was mild, about 60 deg w/ moderate humidity. The bike is stock except for FMF Fatty. Yes that is the stock VForce reed setup. Regarding the dirt in the picture I just wanted to have a quick look at it right away, I don’t work on it like that. Are you able to repair this cylinder? If it would help I can get you more pictures later when I get it back in the garage.
  12. Mike_80

    Damaged Cylinder Questions

    ‘06 CR250 See pictures. Just put a new top end on, got 1 1/2 laps around the track and then this. Haven’t changed anything, just lapped the cylinder mating surface and replaced the head. Only thing unusual was some spooge dripping from the motor/expansion chamber connection before I took it out on the track. 1) Any ideas what might have caused this? 2) Can this cylinder be salvaged? 3) If I buy a new one can I just plug-n-play or will it require some preppping first?
  13. Mike_80

    Spark plug question.

    I’ve never seen any of mine look like your new kind. All of mine have always looked like your old one.
  14. Mike_80

    My bike won't start!

    I’m all about asking questions so nothing wrong asking this, but do you think it might be best to either find someone to help you who has a little know-how or take it to a shop? We want to help you but also don’t want to lead you into doing something you’re not comfortable with. If it’s a simple misunderstanding and you feel confident in performing some basic motor maintenance then my apologies and let’s proceed. You need to see if your coolant level went down any. A possible cause of this is that it’s leaking from the cooling jacket ports across the seal between your cylinder and cylinder head. Ultimately that causes fairly significant engine damage and we’re going to have you digging in to look for any of this type of evidence. Even if you don’t see anything dripping from your bike you can still lose coolant this way so it’s important to always check your coolant level after/before every ride.
  15. Mike_80

    My bike won't start!

    So now let’s figure out where the problem is. First thing, take the cylinder head off and post some up close pics. Keep in mind this leak might be obvious and easy to spot or very subtle and take some closer inspection. If we see the leak there then we can help you decide how to take care of it. How did the coolant level look?
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