need some general help

[2002 cr250r]

Hey guys I haven't been on here in well a long time lately but I've come back with a few questions I hope some of you can help me with. I have a 2002 cr250r that I'm having a hard time with. I seized it back in feb. and had the cylinder sleeved with and bored for stock pistion sizes. now I hear it's better because u can just bore it next time intead of replace the whole cylinder because of that nickelplating? or whatever. the problem is that the bike doesn't seem to run nearly what it was before. before I easily took all 450s up any hill at glamis and I smoked my buddys yz250. the stocky cylinder just seemed soo much strong than this. I don't know if all it needs is a little tuning. should I try to rejet it? if so any tips on what exactly i should do? what do you guys know about these sleeves? I believe i got it from la sleeves but I'm not quite sure. also now that I'm working I have a little extra money at spare I was considering spenidng up to 1500 on motor mods to make this thing run like hell. what would you recomend? high compression? bigger carb? or should i just go back to a stock cylinder and see what i can do from there? if does anyone know anybody near phx or anyone who is good at doing 2 stroke tuning/building and can help me out? I want this bike to scream like it use to. especially for this upcoming dune season.

[atomicsaladbowl]

hahaha hmm im not to sure whats goin on there... so u went to a rebore and then it doesnt have nearly as much kick? if you have the money just buy a brand new top end, piston cylinder and all, otherwise maybe try rejetting it, I am really not sure what is going on

[tughill283]

if you sleeve a cylinder take into consideration that the sleeve is now part of your transfer ports,it will change very important angles and port roof hieght. i would consider going for a port job and see what that brings you before anything else.
i cant really see any other reason for power loss. i guess the only other possibility
is a loose bore job,check your tolerances. good luck regaining power.

[NELSON]

yup port work and rejet. i think tug forgot to say the new sleeve doesnt match the cylinder. losing alot of flow and duration. nice bike btw!

[tughill283]

Originally Posted by NELSON

i think tug forgot to say the new sleeve doesnt match the cylinder. losing alot of flow and duration.

yup thats what i meant,not matching up

[NELSON]

head torqued correctly? leaking gasket?