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Andyru

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About Andyru

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    TT Newbie
  1. I’m doing the rebuild to mostly learn. I resurfaced the block and the cylinder has been bored for an oversized piston. I’ve been checking clearances throughout the build, and I was curious how close the valves get to the piston. I had read that .080 in. for the intake side and .100 in. for the exhaust side is pretty standard. So I was surprised to see such a large clearance? I do have a larger size gasket installed, but it would not have changed the P2V clearance that much.
  2. I'm doing a rebuild on a 1990 xr200. I checked the valve to piston clearance out of curiosity. I got a much bigger reading then I thought I would get. I got .1775 in. clearance for the exhaust and .2256 in. for the intake side. Perhaps I did something wrong checking valve to piston clearance? Is this normal clearance for these bikes? I used clay and did one full rotation of the cam sprocket.
  3. Andyru

    Honda XR200 Piston to head clearance?

    Thanks for the help. So I put in a gasket and got .0332 in. squish clearance and then I thought that with time and the vibration of the bike, the clearance would decrease over time as things settled. So I put in a slightly thicker gasket and got .0408 in. clearance. Then I thought I would check the valve to piston clearance out of curiosity. I got a much bigger reading then I thought I would get. I got .1775 in. clearance for the exhaust and .2256 in. for the intake side. What are your thoughts? Perhaps I did something wrong checking valve to piston clearance? I used clay and did one full rotation of the cam sprocket.
  4. Andyru

    Honda XR200 Piston to head clearance?

    I haven't got a measurement yet. I did some resurfacing and when I put the block in with gasket I noticed the outside edge of piston potrudes beyond block a little. However, with head gasket on it wouldnt hit the head. I have a thicker gasket I could put on to get the piston probably flush with the block. Im just not sure where it supposed to sit. Are there any clearance specs I should check for or is it not as critical for this kind of bike?
  5. Doing a rebuild on 1990 Honda XR200. With gasket and cylinder block together, if I rotate piston the outer edge of the piston potrudes slightly beyond the cylinder deck and even more so in the center of the piston. Any advise on what to do? I was think of a thicker gasket? Also, what should the piston to cylider deck clearance be? What's the best way to measure? Thanks!
  6. Andyru

    1990 XR200 Rebuild

    Does anyone know the Piston to head clearance?
  7. Andyru

    1990 XR200 Rebuild

    Thanks everyone!
  8. Andyru

    1990 XR200 Rebuild

    Anyone know the torque spec for the crankcase? I guessed the first time...my repair manual doesn't say.
  9. Andyru

    1990 XR200 Rebuild

    I took it back apart...one of the dowels is in bad shape. I was able to adjust it a bit...problem solved 👍
  10. Andyru

    1990 XR200 Rebuild

    Yeah, I guess I better pull it apart and see what I can do. Can I re-use gasket u think?
  11. Andyru

    1990 XR200 Rebuild

    Hi, I am in the process of assembling a 1990 Honda XR200. I just fit the two crankcase halves back together and noticed where the cylinder block sits one half of the crankcase sits about .004mm lower than the other half. I placed the block down and u can rock it from left to right. Should I resurface it?
  12. Andyru

    Honda XR200 1990 cylinder specs

    So I was looking at buying a 66mm piston. However, I realized this dimension is the bore size, correct? This dirtbike was given to me not running and partially disassembled. It had a new piston installed that the previous owner put in (stock size). He couldn't get it to run. I think the motor has already been bored out for a 66mm piston. My measurement was 65.9968mm.
  13. Andyru

    Honda XR200 1990 cylinder specs

    Sorry, the cylinder is measured at 2.5983in (65.9968mm). Specs say Cylinder to piston clearance should be 0.0006-0.0018in. Stock piston O.D. is at 2.578in. My measured cylinder to piston clearance is at 0.0203in. Will it run okay or will I have to bore out the cylinder and up the size of the piston to 66mm (2.59843in)? Also, if I have to up the size of the piston to 2.59843in (66mm), could I just hone it out to get it to fit? If oversized piston (2.59843in) + the clearance (.0006in) = the cylinder diameter that I need (2.59903in). That minus my current bore size would mean I would only have to hone out .00073in, which I would think is hardly anything for a hone to do. Thanks for your advice!
  14. Doing a rebuild on Honda 1990 XR200. Dirt bike came with new piston. However, I measured the cylinder diameter and it’s 2.983 inches. Specs says it needs to between 2.2.5787 and 2.5791 inches. Service limit says 2.583 inches. Will this bike run? I’m doing this more as a learning experience. I don’t want to put a lot of money in it, however I do want it to run good enough to ride on some trails. Thanks.
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