火箭三R中气缸压缩为零。有人知道原因吗？

[JAPANユーザー]

Un huh- what kind of "car?"

 

[Journeyman]

When I started the car, I heard an unusual exhaust sound and the instrument panel light came on. The computer detected the fault code P0068. I touched the exhaust pipe and the middle temperature was very low, so I concluded there was a problem with the middle cylinder. Test results: The compression value of the middle cylinder was 0.

I'd be surprised it would run on two cylinders. Something sounds off on this

 

[Kiwicol]

My take on this is if you really have zero pressure in #2 it's take the head off time & see what the hell has happened. Bore scope at a minimum

 

[JAPANユーザー]

My take on this is if you really have zero pressure in #2 it's take the head off time & see what the hell has happened. Bore scope at a minimum

I have looked with an endoscope and the cylinder looks normal and the valves look OK.I don't dare to disassemble it easily because I don't have the professional repair tools for this motorcycle. A repair shop in Japan might cost 1 million yen.

 

[Journeyman]

I have looked with an endoscope and the cylinder looks normal and the valves look OK.I don't dare to disassemble it easily because I don't have the professional repair tools for this motorcycle. A repair shop in Japan might cost 1 million yen.

Can you give us more information, including....

- How many miles on the bike - out of warranty?
- Before the problem started were you flogging it (running really hard, redlining...)
- Will it still start?
- Send a video of it attempting to start and/or run.

 

[imcool]

I have looked with an endoscope and the cylinder looks normal and the valves look OK.I don't dare to disassemble it easily because I don't have the professional repair tools for this motorcycle. A repair shop in Japan might cost 1 million yen.

probably start investing in tools if you plan to keep the bike.

 

[TURBO200R4]

I'm watching this post to see where it goes

The new Rockets have decompressors. These keep the exhaust valves open before startup to make turnover easier. I suspect that might be the case here. This drove me crazy when I was first checking valve clearances, as some were waaaayyyyy to open. If the cylinder in question is in position for the exhaust valve to be be closed while running, but it is not running, that valve will be propped open and that would give you zero compression.

A look at the 2.5 Innards - DIY 20K mile service, including valve clearance check and shim replacement

I am curious as to how much it holds down those exhaust valves Measuring with and without would give us the answer if possible?

www.r3owners.net

it seems to me that no one is paying any attention to this important post
witch means that you can not rely on the compression test.

 

[imcool]

it seems to me that no one is paying any attention to this important post
witch means that you can not rely on the compression test.

can you explain why cant rely on compression test?

so in case of OP zero compression, he should be testing / checking the valves from Journeyman YT video?

 

[Journeyman]

can you explain why cant rely on compression test?

so in case of OP zero compression, he should be testing / checking the valves from Journeyman YT video?

Thinking this through a bit more, I think that if the compression test was done correctly that the decompressors would probably swing away and it would give an accurate reading.

I'm with @TURBO200R4 in wondering if it was done correctly- I think that is what he's probably saying.

There's a time difference, so maybe we'll get more information, which for now is unusually scant, from the OP a bit later.

Until then, here's my understanding....
Assume bike was running OK, then suddenly...
Went to start - it started!,
Sounded rough.
OP decides to feel the pipes- one is not hot
Does compression test, revealing middle cylinder has zero compression
Scoped the cylinder but, despite the compression test, the pistons and valves look fine

I'm still curious if it will start and would like to see a video of that. I'm betting that the cylinder is fine and the problem is something less drastic.

 

[Kiwicol]

Thinking on this, even if the decompressor was jammed open, the speed at which the engine is turned over to start would still create 'some' pressure, not zero.