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Old 11-11-2007, 03:41 PM
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Default Cylinder Nick

     

I have my bike tore apart to replace the crank seal bearings and put a new piston in it ect from when it got messed up and at the very top of my cylinder there is a small nick which i measured at school on our CMM and found out that it is .007 inch (.177 mm) deep. I have the older cylinder sleeve in my bike where they were nikasil ('96 CR250) and I have asked quite a few people if that should be resleeved or if it wouldn't really matter being so small. And the responses have been for both so I would like to hear some opinions here. I don't race just do a lot of trail riding ect, so lets hear everyones response.
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Old 11-11-2007, 07:18 PM
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Default Re: Cylinder Nick

you are confusing me a little bit when you talk about the sleeve. if it is currently sleeved with an iron sleeve/liner you can bore it to take care of the scratch.

If the ring is not going to contack the scratch don't worry about it. if the ring will contact it you could lose some compression. if the cylinder is plated and the scratch is going to cost you some power, replate, don't sleeve.
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Old 11-11-2007, 08:40 PM
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Default Re: Cylinder Nick

Quote:
Originally Posted by ossagp View Post
you are confusing me a little bit when you talk about the sleeve. if it is currently sleeved with an iron sleeve/liner you can bore it to take care of the scratch.

If the ring is not going to contack the scratch don't worry about it. if the ring will contact it you could lose some compression. if the cylinder is plated and the scratch is going to cost you some power, replate, don't sleeve.

It currently has that nikasil type coating or whatever and from what i've heard you can't have it just bored out you need to have it bored and sleeved which would cost quite a bit. The ring will contact this but the thing is all my friends my dad and grandfather have all had split decisions, some say the type of riding i do (not MX Racing) the small compression loss that i will recieve is not a big deal and not to spend the extra money having it bored and sleeved but than some are saying definatly have it sleeved

I guess basically what my questions is, is being that the nick is so small would it matter if i DONT have it fixed will that dramatically reduce the life of my piston/rings?
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Old 11-12-2007, 11:46 AM
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Default Re: Cylinder Nick

Like Qssa said, if you repair it, have it re-plated, NOT sleeved.

If you don't fix it, and the ring contacts the scratch, it will effect the power, as well as life expectancy.

Rotor
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Old 11-12-2007, 12:56 PM
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Default Re: Cylinder Nick

Alright thanks for you guys' help, I doubt i'm going to have it fixed since i don't really have like $300 to spend on it being it's not going to really hurt much.
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