Time for a bore?

[Yamahauler]

I've got my cylinder apart on my YTM200. I'm getting mixed opinions on if I should bore it out. Some say do it, others say hone it. Its burning a lot of oil, The cylinder walls to not seem like they are scored.
What else causes it to burn a lot of oil?
What should I check?

[Yamahauler]

Also, do you use a wire brush to clean all the carbon off of the cylinder head?
thats what the manual says, but I thought that might be too rough....

[bigredhead]

Do a compression check..... got the tool ?

[bigredhead]

only bore if you HAVE to.... otherwise.. hone and new rings.

Once you bore.. you can't go back.. once you hit the bore limit you need a new cylinder.

No performance increase worth writing home about from a minimum bore.....

[TimSr]

You need to have it measured with the proper tools. Nobody can tell if it needs bored by the amount of oil it burns, and being smooth does not mean it is not worn.

[KayodicWeazel]

If it's burning oil, and the walls aren't scored too deep, its the rings. Just get a new piston kit and you'll be fine. You can try cleaning the carbon off with a rag and some kind of solvent first, I personally wouldn't try the wire wheel. Too scratchy.

[TimSr]

If it's burning oil, and the walls aren't scored too deep, its the rings. Just get a new piston kit and you'll be fine. You can try cleaning the carbon off with a rag and some kind of solvent first, I personally wouldn't try the wire wheel. Too scratchy.

Im really impressed that you have the ability to measure his cylinder, sight unseen, over a message board.

[bigredhead]

I agree with Tim ( I'm facing the exact same delema with my XR project.. got 3 cylinders.. 1 piston.. and no micrometer.. )

I checked on e-bay for one, but alot of cheap and expensive versions......... anyone able to recommend a perticular one ?!!

It's a dream to some day have ALL the tools in my own garage.. not have to go places with parts for things no garage wants to do.. for free.....

[bigredhead]

How accurate is the method of putting the piston ring in the cylinder and checking the gap ? ( That's how i was told the cylinder i got would fit the shiney new piston already on the crank !!!! :yikes:

[MTS]

take it to the local bike shop and have them mesure the piston and bore with a micrometer for roundnesss and size, and check it against the specs in a service book is the best way, "How accurate is the method of putting the piston ring in the cylinder and checking the gap ? ( That's how i was told the cylinder i got would fit the shiney new piston already on the crank !!!! :yikes:" thats only for setting the final ring end gap AFTER it has been measure with a micrometer and honed/bored what ever was need'd.

[KayodicWeazel]

Im really impressed that you have the ability to measure his cylinder, sight unseen, over a message board.

It are cause I gots the amazing psychic powers. And stuff. Actually I was just referring to what he should do generally. I'm not giving him instructions.

[bigyellow4x4]

using a feeler gauge to check clearancesis good if you know your bore is round and not taperd. chcking size is no good if you have out of round cyinder or alot of taper!!!

[KayodicWeazel]

Actually, you know what? Ignore my posts and just send it off to a dealership to be checked. It's always better to leave this sort of thing to the certified techs.

[Yamahauler]

or I could do it myself, saving maybe $150 in labour......
It's not too hard to do....

[kilabeez0]

yes, listen to king tim. he is the grand master of sarcastic posts. he is always right. no one should even bother posting, just pm him and he'll give you the answer. here comes my debate of taking suggestions from other members rather than just taking tims answer.