火箭三R中气缸压缩为零。有人知道原因吗?

We're good! No offense taken. We'll get through the translation issues. Thank you for telling us about the auction. That's the kind of thing we usually know about right from the start. I had a suspicion that might be the case- that you bought it in this condition. So, maybe not such an easy fix afterall, but we'll definitely lend you a hand.

Hopefully, you just need to replace a shim, but that is awfully tight, which doesn't sound good. Instructions for removing the camshaft, replacing shims, setting the timing, etc. is all in this link. When I first needed to do this I could not find any mention, text or video, on this process so I had to jump in. That's when I learned about the decompressors. By now there may be other sources you can find online, but not sure. I'm up for the 40K mile service and will probably do that sometime later this year. I'll probably create a more thorough version at that time. For now, you seem pretty handy and this and the manual should give you all the information you need, including the necessary tools. Start at the beginning and read through the entire post......
Thank you very much! I often repair flat-bar engines, but I've never used the tensioner and gear retaining pin included in the Triumph repair tool. I'm wondering if I can repair it without them. They're difficult to buy, and I believe few people in Japan would dare to attempt this engine repair. If possible, could you take a photo of the gear retaining pin tool, measure it with a caliper, and send it to me? I'd like to try making one myself. Thank you.
 
i am thinking that this bike has a decompression problem or the seat in the head has come loose and damaged the head letting the valve stem come up against the cam leaving zero clearance and not able to let the valve come up to seal the chamber.
I used an endoscope to observe the top of the piston and there were no obvious scratches. If the valve can be fully closed after I remove the camshaft, then it means the valve is not bent.
 
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Thank you very much! I often repair flat-bar engines, but I've never used the tensioner and gear retaining pin included in the Triumph repair tool. I'm wondering if I can repair it without them. They're difficult to buy, and I believe few people in Japan would dare to attempt this engine repair. If possible, could you take a photo of the gear retaining pin tool, measure it with a caliper, and send it to me? I'd like to try making one myself. Thank you.
It's a pretty tight tolerance, so if you can order from Triumph I'd definitely go that route. I found it tricky to get it to go in fully. I don't think you'll be able to reproduce it accurately enough. I'm away from home, but will send you a photo when I get back and we can decide if you still want to give it a try.
 
I used an endoscope to observe the top of the piston and there were no obvious scratches. If the valve can be fully closed after I remove the camshaft, then it means the valve is not bent.

i do not think that the valve is bent
but once you remove the camshaft you should try your air/compression test and then if you have a good test try to adjust the valve clearance.
hth
 
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It's a pretty tight tolerance, so if you can order from Triumph I'd definitely go that route. I found it tricky to get it to go in fully. I don't think you'll be able to reproduce it accurately enough. I'm away from home, but will send you a photo when I get back and we can decide if you still want to give it a try.
Ok, thank you very much. Looking forward to your photos
 
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