jtanman

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About jtanman

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  1. I frequently pull the clutch lever with all my fingers. I've done it since I started riding 10 years ago. On technical terrain as I'm feathering the clutch I have a poor hold on the left grip which clearly makes me suffer. Part of the reason I got stuck in the habit was because I got used to riding with poorly adjusted clutch levers.
  2. And here’s the cylinder. Some cross-hatching seems to be gone. Hard to tell. I think it’s free from grooves from the pipe, thanks for putting that on the checklist. Oh and thanks for detailing a way to check the crank seals! I appreciate ways to test if parts are good instead of opening my wallet at every turn and buying all new parts based on a faint hunch.
  3. I did hold the throttle open, but the bike wasn’t warmed up at all, thanks for the tip. Here is the piston and head. No blow by.
  4. I have removed the cylinder to inspect the top end and it appears that the piston and rings are indeed fairly new looking. The gaskets and cylinder wall seem to be in good condition as well. Am I missing something? Why would I have such low compression?
  5. Thank you for the tips. I’ve been on the fence about rebuilding the top end because the previous owner “said” he did it less than 20 hours ago. Although a compression test result of 130 psi yesterday perhaps confirms that a new top end is in order. Preventatively replacing the crank seals is a new concept for me because up to this point I thought that the seals are okay to just replace when they go bad and the bike smokes excessively. Forgive me for making you cringe if this tactic is terrible, I’m just learning as I go!
  6. Also.... I’m taking a peek into the intake port and suddenly feeling alarmed at the appearance of the rod. Does that speckled color mean something? [emoji32]
  7. Just getting to know my 1999 cr250r. Two of the reeds have frayed edges. Is that regular wear and do I replace these without hesitation? My two-stroke knowledge is very minimal.
  8. Thanks for the ideas, lots of those are things I wouldn’t have thought of. I wasn’t able to touch it today but hopefully tomorrow I can dive in.
  9. Good news. I got the bike back together and it runs great! No weird sounds or leaks anywhere and so far it seems to start with 2-3 kicks. Thanks again for everyone's help. I've read about these bikes having a centrifugal oil screen near the clutch so I'm going to pull of the clutch cover and check that out. Anything to help ensure that the oil is flowing freely.
  10. I've owned my '99 cr250 for about half a year and it's been great to me. A week or so ago I was riding hard up a long steep trail for an hour or so and the bike began to bog and die, seemingly unrelated to the amount of throttle I was giving it. After restarting it a couple times it eventually stopped starting altogether so I turned around and coasted her down in neutral. Out of curiosity I went to start it again when I was down at the bottom of the trail before loading up and it started perfectly and seemed to run great. Weird. In any case, I thought maybe the plug was fouled and a new one might clear up the symptoms. I installed a new plug back at the garage (week later) and gave it a kick. It started first or second kick, idled great, and revved up through the RPM range. Awesome. I holler to the wife and we load up the CR with her CRF150F and we head up to hit a local trail. We arrive, unload, and I start up the CR first or second kick before it promptly bogs and dies within a few seconds just like before. I kick again, she starts, then dies even quicker. Then nothing. I play a little with the fuel ratio screw (knowing it's jetted slightly rich), but that doesn't seem to help at all either. After a fair amount of huffing and puffing we reload the bikes and back home we go. I'm planning on pulling off and inspecting the carb and reeds as well as running a compression test later today. Any ideas on a likely culprit?
  11. Is that year fuel injected? If not it sounds like a classic plugged pilot jet in the carb.
  12. If you find that you do need to remove the valves then you can go to a local Oreilly's or Autozone and borrow a valve spring compressor.
  13. I just read through this entire thread from the beginning. Great stuff, thanks for the detailed updates and pictures. Did you have any previous experience fully rebuilding bikes before the WR? Seems like it all comes quite naturally to you.
  14. Alright, I'm on the tail end of the work at this point. As far as I can tell all that's left is to assemble the pulse generator on the cam and adjust the valve clearances then pop the engine back into the frame and hope for the best. I hope to possibly get this accomplished by tonight. Here is what I've done: Honed cylinder (machine shop confirmed no taper) Replaced piston rings Replaced both valves, lapped them, checked for good seal Replaced valve seals (they fit much more snugly than the old ones) New gaskets (excluding the valve cover gasket that wasn't in the kit or anywhere I could find on eBay. I used high temp silicone instead.) New cam shaft New timing chain, guide, and tensioner Here is a big question I have: As you may have noticed in the previous photo, the lobes of the old cam were in terrible shape. Full of flat spots, worn down considerably, and sharp burrs. Is this a natural way for the cam shaft to wear out or was there something seriously wrong? My initial impression is that it was oil deprived. Is there a way confirm that oil is flowing well into the top end? Likewise, is there a screen or something somewhere that stops up the flow that I need to check? I would hate to get the bike running only to find out that the brand new $90 cam shaft is tearing itself apart exactly like the old one. I would also love to hear any last minute tips and tricks for adjustments, break-in stuff, etc. I'm admittedly quite nervous considering this is my very first rebuild.
  15. I'm no pro but maybe you could try spritzing a little starting fluid into the cylinder to bypass the carb? That could help isolate the issue more. If it fires with a squirt of fluid then you'll know for sure if it's a carb/fuel issue of some sort. Not sure if you tried that already.