Question about 2003 HM CRE 250

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Maintance I have decided to change the springs on my nephews250 to pro circuit springs. I've ordered up a shop manual. I'll inspect everything while I'm there

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Who knows what I'll find. What would be some required tools for the top end/valve job? It may be worth getting a few much needed 4 stroke tools for the shop since the mode is being set and a 4 stroke four stroke is the only thing I see in the future for my youngest kid. Unfortunately he'll never get to use a 125 competitively in this much changing industry. I've always did my own maintenance and I won't stop because of it. You are going to need the regular metric sockets to get the head and everything off. You are also going to need to get a valve spring compressor. Just a note though. Make sure you get a bunch of bags and put the valves keepers, and shims seperate and know where they go. You can not swap valves. make sure to label them like left exhaust right exhaust and dont swap them out. Other then that you should be good to go. Not to hard of a job,,,

Posted on Nov 10, 2008

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You can change it. Im looking for the correct amount to do it myself. I already pulled mine apart and bought a rebuild kit for it. Comes with a new nitrogen bladder, o rings for the seal, and a few other necessary items. Just remember to measure where the jam nuts holding your spring is so you can put it back in the correct location. As for the nitrogen i heard 150 psi. I'm fortunate to work at an offroad racing shop so i'm just gonna fill mine with nitrogen there, but i dont think you should get charged too much at a regular bike shop. Rockymountainatv.com has the rebuild kit. You will need the seals atleast. If i find anything else out i'll let you know. Hope this helps.

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i know you have to change the oil and oil filter but how often and is that the only thing different from maintance on a 2-stroke?. Im getting an 04 kx 250f any help would be great!The two most important aspects of four-stroke maintenance are frequent oil/filter changes and regular valve clearance checks/adjustments. And some four-strokes (RMZ450 for example) have a manual timing chain tensioner that must be regularly checked/adjusted. Everything else is exactly like a two-stroke.,,,

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