More cg-125 engine questions from a complete novice.

[thx1138]

My questions may seem blindingly obvious to some of you, but I am completely new to all this, I've only had this bike and a set of tools for 10 days, never really done anything mechanical before in my life.



Does this piston need cleaning, if so how do I clean it?

The gasket needs replacing, how do I clean the old one off, and how do I put a new one on?

How do I make sure afterwards that there are no bits of crap inside the engine, could I wash it out with paraffin for example, would that work?

https://img.photobucket.com/albums/v616/THXII38/Bikes/Picture030.jpg
https://img.photobucket.com/albums/v616/THXII38/Bikes/Picture031.jpg


When I put the cylinder barrel back on, what are those levers there called? Are they what the push rods go on? How do I make sure they go back in the correct place on the engine?
https://img.photobucket.com/albums/v616/THXII38/Bikes/Picture032.jpg

[finpos]

Best to bung up the holes in the engine with newspaper so nothing gets in there inthe first place.

You could clean the piston if you wanted. Personally, I wouldn't bother.

Scrape the old gasket off with a hard plastic scraper and a great deal of patience.

The push rods normally fit into guides, which will, er, guide them to where they need to be. Check the manual.

finpos.

[thx1138]

Thanks. when putting a new gasket on, does it use any type of adhesive, or does it just go on dry?

[Blau Zedong]

Put it on dry after cleaning the faces well.
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18:54:48 Rob Fzs: jews don't give away stuff for free

18:54:59 Rob Fzs: unless its their clothes/ hair/ golden teeth

[finpos]

You put them on dry. Some old boys smear them lightly in grease first, and that can help stick them in place if it's a bit awkward to assemble everything. Definitely don't use any of the special gasket compounds on it - they are usually for when you don't have a gasket at all.

EDIT don't put anything at all on the head gasket

finpos.

[thx1138]

okay thanks guys, well that about wraps up my questions for this week, I'm sure I'll be back next week with more questions, probably electrickery related.

[TheShaggyDA]

Or "how do I get a washer out of my crank case without splitting them?"
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Current: CB500 Previous: CB100N, CB250RS, XJ900F, GT550, GPZ750R/1000RX, AJS M16, R100RT, Enfield Bullet

[i:6e3bfc7581]But still I fear and still I dare not laugh at the madman...[/i:6e3bfc7581]

[stinkwheel]

You can make an effective scraper for the old gasket material by splitting a piece of copper pipe about 1/2" along its length then opening it out and hammering the end flat.

You need to be very careful not to mark the soft alloy surface, take your time.

From pictures that were posted on here by someone a while back, it would be worth your while fishing out the gauze oil filter and giving it a clean while you have the engine handy. It may never have been touched since the bike was new.

[thx1138]

[muddycoffee]

[Gazdaman]

Definitely bung up all holes.

I dropped a nut down an XJ600 engine once. Luckily it was sat on top of the CCT and I could fish it out. Nearly shat myself.

Gaz