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Author Topic: My CB175  (Read 12791 times)
Connito
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« Reply #15 on: September 25, 2011, 05:31:48 PM »

Yesterday I decided that I have to take the engine out. There was no other way around  it.


Here I am getting ready:


Few hours later the engine was free and ready to be taken out:


Then the big guns came to the rescue:

 And voila:



This morning I found the reason for the 0 PSI in the cylinder:


To be continued...
« Last Edit: September 25, 2011, 05:41:20 PM by Connito » Logged

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azure
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« Reply #16 on: September 25, 2011, 06:28:48 PM »

Peter,

That hole in the piston looks suspiciously similar in shape and size to the valve above it. What's the inside of the head look like?
Also what do the spark plugs show you concerning fuel mixture, there does not appear to be any carbon on the tops of the pistons.
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Connito
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« Reply #17 on: September 25, 2011, 06:39:14 PM »

Here is how the head looks. The spark plugs look good in my opinion, but what do I know? They are new and the fuel mixture was okay (I think) because the bike ran very well.

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andy750
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« Reply #18 on: September 25, 2011, 09:04:59 PM »

Good photos! You might want to think about giving that head to Mike to do a little porting work for you...clean up the intakes a little. Will increase your airflow...Gene what other mods can he make for a few more horses? Cam? Valve job?

Looks like you are making progress in any case...now why do pistons get holes in them?

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Connito
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« Reply #19 on: September 25, 2011, 09:06:38 PM »

Good photos! You might want to think about giving that head to Mike to do a little porting work for you...clean up the intakes a little. Will increase your airflow...

I am thinking about it!

There is much thinking to be done. First I would have to take everything apart and see what's the condition of the bottom end.

Right now I am having trouble removing the cylinders...
« Last Edit: September 25, 2011, 09:10:09 PM by Connito » Logged

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Connito
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« Reply #20 on: September 25, 2011, 09:07:26 PM »

now why do pistons get holes in them?


I dunno Huh? Huh? Huh?
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knowsnothing
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« Reply #21 on: September 25, 2011, 09:33:40 PM »

Nice work peter!  Looks like you might have some new wall art with that holey piston.  Its curious how the rest of the chamber/valves don't look too abused.... Maybe the answer to the mystery will be found further down?

Go gentle on the cylinders when removing.  You will kick yourself if you break some fins. 
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Connito
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« Reply #22 on: September 25, 2011, 09:37:51 PM »

Thanks for your help yesterday, Treeve!

I am going gentle on the cylinders, but nothing is budging. Perhaps I am going too gentle  :Smiley
It is coming out one way or another. With fins or without Grin
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azure
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« Reply #23 on: September 26, 2011, 01:50:19 AM »

Looks like the exhause valve on the left side might be to blame for holing the piston as it looks like it is not seating. What's keeping the valve open Peter, or is it just my old eyes that make it seem that way?
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Alan F.
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« Reply #24 on: September 26, 2011, 08:39:58 AM »

A little heat on that cylinder block might help it to pop off easily, avoid prying it up at all costs.
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knowsnothing
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« Reply #25 on: September 26, 2011, 09:02:06 AM »

Rubber mallet!
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Connito
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« Reply #26 on: September 26, 2011, 09:03:05 AM »

Looks like the exhause valve on the left side might be to blame for holing the piston as it looks like it is not seating. What's keeping the valve open Peter, or is it just my old eyes that make it seem that way?


One of the valves is open, yes. Perhaps that is the reason. I haven't had the time to take it apart, or even examine it closely. The weather was so nice yesterday, so I took advantage of it and went for a little ride with the sidecar and Silva in the morning and with Eric in the afternoon.
I will get to it tomorrow or Wednesday.
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Connito
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« Reply #27 on: September 26, 2011, 09:04:05 AM »

A little heat on that cylinder block might help it to pop off easily, avoid prying it up at all costs.

Good tip Alan, thanks! How are you?
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« Reply #28 on: September 26, 2011, 09:04:56 AM »

Rubber mallet!

That's what I have been doing. I am afraid to hit it harder...
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« Reply #29 on: September 26, 2011, 10:42:54 AM »

Rubber mallet!

That's what I have been doing. I am afraid to hit it harder...

Yeah it can be tough.  All you are trying to do is break the gasket seal.  Once broken, they should slide out nice and easy.  Heat might help like Alan said.
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