KX Riders
Maintenance & Technical => KX250 / KX125 => Topic started by: Kawasakinut on February 16, 2008, 12:19:32 PM
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got my clylinder here and not sure what to do found a good sized mark that can be felt by hand. in the manual it says to replace the cylinder if worn since the electrofusion cylinder cannot be bored or honed!! so this cylinder is plated then? if so it can be replated right?
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that cylinder looks sleeved
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stewart thats why i'm confused it says electroplated in the manual, but i used a magnet and it stuck pretty good so that would indicate
that it is sleeved?
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yes it looks like it to me what does the bore mesure
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not sure i haven't bought a dail bore gauge or mic set yet. my birthdays on the 19th if ya'll want to buy me some presents.
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Bring it to a local macine shop or engine builder to have it measured.
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what are your thoughts on (l.a. sleeve) are they a good or bad company? are there others that you guys use, or know of. i am thinking of sending this cylinder out to complete the top end. l.a. sleeves website says that they will relieve, champher the ports, hone and fit with piston and rings and supply the lube for completing the top end. I'm not sure what their price is. any suggestions?
jimmy v.
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la sleeve is a good company from my experience
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plated
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Did you have the cylinder measured? If it comes within specs, you're wasting money on a sleeve. You're going to have the most expensive 2000 KX250 to roll out of PA soon.
-just sayin'
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That sure looks like an iron liner from the pics. Normally you don't see that thick band in the ports since plating is very thin. If so you can just bore it the next oversize. You will have to find an aftermarket oversize piston first. Cam.
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I've had over 5 of my bikes sent to Eric Gorr for big bores and he always had them sent to US Chrome for the replating while he had it.
http://www.usnicom.com
5 big bore bikes, at least 3 of them rebuilt and replated again years later. Never had an issue with them always top notch plating.
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That sure looks like an iron liner from the pics. Normally you don't see that thick band in the ports since plating is very thin. If so you can just bore it the next oversize. You will have to find an aftermarket oversize piston first. Cam.
so why would the previous owner have put a sleeve in this cylinder? what are the disadvantages of using a sleeved cylinder- what are the advantages?
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I think that the plating is where the life span is at. I mean to say the nikasil/ electroplating lasts longer. I am pretty sure that these guys have said you can plate bored cylinders, just the same. I think the benefits to me are that with plating I can stay stock piston size and always be able to get top end kit, bammo.
I've always had stock cylinders. I know when you talk about boring out kx cylinders its minimal at best because of powervalve, right?
Thomas Racing Service, Trinity Powersports also good engine builders. Also, what about the guys on here? 560 done Stewart? :-D
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so does anbody have any suggestions of what i should do. should i just buy a brand new cylinder, should i have this one rebored to correct the flaws in the bore, or can the sleeve be taken out and the cylinder be replated to stock condition?
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I'd personally have the cylinder exchanged for a 310 bigbore, but in your case, it would be cheaper to have it bored a few 'mm' over stock to correct the sleeve flaw.
I am no fan of a sleeve, they tend to run hotter and not last as long. But, for the $$$ I'd stick with your sleeve and have it bored slightly.
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what company makes the 310 bigbore?
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so does anbody have any suggestions of what i should do. should i just buy a brand new cylinder, should i have this one rebored to correct the flaws in the bore, or can the sleeve be taken out and the cylinder be replated to stock condition?
I would just have it bored to the next size. The thing to remember with an iron sleeve is that warm up is very important. The aluminum piston and the iron sleeve expand at different rates and you can cold seize the bike If you dont warm it up properly.
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what should be the normal charge for a boring to the next size? i found a machine shop to bore it ,he said he'd do it for $50 bucks. he also showed me 2 motorcycle cylinders that he had lying there that he was going to work on. looks like he has done them before.
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It has been a long time since I had that done and when I did, it cost me $75.00. So sounds like $50.00 is more than fair but only if the guy really knows what he is doing! If he doesn't it could be a bad deal for FREE... :wink: