to bore or not to bore? Lost soul here, need guide

This was a good first post. In my opinion you can't go wrong with a an overbore now a days. Eric Gorr(A sponsor of this site) does quality work for half the price of other shops. I would recommend going to a 265 cc over bore and port job. The 265cc is very reliable. This cost arounds 400 bucks and includes a top end. To me the only con about a big bore is when you sell the bike. I would get suspicious on to why a person got his/her engine bored. Also now that you have the top end off check your connecting rod. How is your connecting rod. Is their play?? For a 1000 bucks you got yourself a steal if it only needs this amount of work.

Erik

Do you know why the cylinders are plated? It's to privide a wear resistant surface. If you install a cylinder without plating, you will quite possible have to have it re-machined and a pision fit, each top end. In theory the plating allows the majority of wear to be on the piston and rings, and not the cylinder.

this is what I do when I buy a used bike that needs tlc.

dont worry abot riding this year, hurts to say it but take your time and do things thorough this winter. Get yourself 3 manuals if you have little mechaincal experience. the factory honda manual for yor bike<cant be beat for well illustrated pictures of assemblies and torque values of the bolts A clymer manual is very good at explaining what needs to be done to someone who isn't a mechanic and Eric Gorr's Performance handbook is the best and being able to tell you what you are looking at, why you are looking at it , and what is the problem ,what can make it better.

engine gets completely rebuilt, con rod , mains, transmision bearings everything. send the cylinder & head off to Forward Motion if you want an overbore and port work done or send the cylinder to US Chrome and get a stock replating.since it is a Honda a new crank might just be worth it compared to rebuilding it<honda cranks are inexpensive and hard to rebuild without the proper set up>

In a well organized fashion remove all large assemblies from the frame and repaint it. rebuild each individual component as you reinstall them. new bearing and seals as needed for the chassis,suspension and wheels.

peruse these forums for specific information about your bike that people did/ have to do and ask questions if you dont see whatr you need to know.

if you are patient, careful and meticulous , and you do most of the possible work yourself you could easily have yourself a basicly brand new 01 cr250 for next spring for under 2500$ Be meticulous with your maintenance,air filter always cleaned, gearbox oil changed often, pistons once a year or however often you may need them and repair any damage as it happens and you will have a nice bike for long time.


Sounds like it is a great deal if you spend your time and money wisely now.