Replating vs. sleeving cylinders

[crazyxr250rider]

I will be rebuilding a RM250K5 some time in the next month or so and wondering what others opinions are on this.
Calling people with reasonable mechanical knowledge....(Eg, Reckless, Danger)
Thanks.

[Buddy L]

i wouldn't think you would need to replate or sleeve a bike of this age, but i supose it depends on use and abuse.
check condition of power vavles
replace all bearings sence the motor will be apart anyway. (peace of mind)

[Quicker_with_age]

wouldn't think you would need to replate or sleeve a bike of this age, but i supose it depends on use and abuse.

Only if the bike has been seized etc he will.

I recently rebuilt my mates bike which had seized and made a hell of a mess of the bore, We decided to go with a cast iron sleeve which gives the option or a rebore or hone should it be damaged again in the future, I also think it was the cheaper faster option, He did comment that it was down a little on power than before so whether or not this was due to extra friction from the cast bore or not im not sure.

[sugilite:Me]

I tried both methods on my KX500. I noticed a definite loss in power when I re sleeved it, and wish I hadn't done that. I recomend a replate.

[Robert Taylor]

I tried both methods on my KX500. I noticed a definite loss in power when I re sleeved it, and wish I hadn't done that. I recomend a replate.

I concur, when you purchase a sleeve and have it pressed in there is in fact a lot of port finishing to do. That requires a small precision right angle die grinder, port roof angle templates, an alloy slug machined up to gauge port heights and matching of AND lots of very fastidious hours. To do this properly would in fact make the job more expensive than replating. ( And you also have to very carefully pick your replating agents! )
As so often happens people see resleeving of a 2 stroke cylinder as a cheap way out, they invariably always get a cheap job and a horsepower deficit. If you are buying a bike that is resleeved it effectively has a lesser value.

[Katman]

And there is now an outfit doing the replating here in NZ. No need to send them to Aussie anymore.

(Will look up their business name when I get into work tomorrow).

[Kickaha]

And there is now an outfit doing the replating here in NZ.

http://www.engineservices.co.nz/cylinder%20plating.htm

[crazyxr250rider]

I know it needs it engine is apart. Nice big gouge below intake port (Air Filter caked in dust)And im replacing all shell bearings and the mains but no others as the bike has very low hours. (obviously small end bearing with the piston..)

[crazyxr250rider]

Good Info guys. Heard of some plating flakeing after less than 10-15hrs running around ports is there any outfits to stay away from????

[Danger]

I'm sorry, I can't help you with this. I'm trying to think of the guy in Barrys point road that has been rebuilding engines for years who could advise you but the name of his business escapes me. Something like Presicion Engine Rebuilders or something? Someone might chime in. I have not used him since the 80's when cylinders needed boring but he is still around from what I hear.
Pulled mine apart last night and almost got it back togeather with a Wiseco Prolite piston. The RM is very easy to work on.

[crazyxr250rider]

Yea im putting a wiseco in there (like every other bike I own....)

[sugilite:Me]

I see your sold on wiseco, but just a blurb from what happened to me. This maybe just a big bore issue, but I went to the expense of getting my cylinder replated, then put a wiseco piston in as I did not like kawasaki nz extortion on a oem one. I had the piston skirts drilled for extra lubrication. Unfortunately the expansion rate was different on a wiseco to standard and it seized cracking one of the port bridges. And yes, I was really careful to warm it up 1st. Like I say, may just effect 500's. suddenly the oem piston did not look so expensive

[crazyxr250rider]

Are you shure it was the Piston??? Not just bad plating ive heard lots of stories about the plating coming unstuck on the port bridges. Where did you get it done? ive never had any trouble and had increased performance over standard.

[F5 Dave]

I'll only ever use US chrome http://www.usnicom.com/, their work has been great & they aren't that expensive. Better to get it done once than pay for 2 cheaper jobs, played that game before, gets boring. They will match it to piston &/or sell you a wiseco.

Actually price is pretty good. Have to mark as 2nd hand for repair & post it, if courier will get screwed up in customs.

[crazyxr250rider]

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