ChopRacing

well we started tearing down justins honda 450r, i know right before disasembly i did a compresion check and the engine had 50psi not good, the cylinder has a wierd wear pattern its hard to see in the pic, i tossed a ring in there its about 80thousands ring end gap, good news is cam looks good and measures good i think its a stocker,not sure,this is my first time building a honda 450 motor so any advice would be appreciated,havent cracked the cases yet but the rod has no up and down movement,im gonna wait untill i get a service manual

JON, thats a stock cam, 2 lines. i showed you the hrc 3 line cam. i think the aftermarket cams have a huge single line.

Looks like the top ring wore a pretty nasty groove at the top of its travel. If that groove is more than about .002 inches deep, or it's uneven around the cylinder, you should get a new cylinder or get that one replated. Midwest action cycle has new cylinders for about $220. http://www.midwestactioncycle.com/ Just click on the OEM parts finder and select your model.
At that price for new, it almost isn't worth replating.

okay whos got a flywheel puller for rent,or whats the trick to getting it off?

jon, you need the puller but i dont have one.

I have a puller. It should work for your flywheel. If you could post a pic of the flywheel, I'll know if it'll work. (Yes I'll let ya borrow it if it'll work)

It's a special puller that comes with a protective cap for the end of the crank. The end of the crank has an oil feed hole and it is recommended that you don't push on this without the cap. I have the puller, and you're to borrow it, or just bring the motor and I'll pull it for you. While we're at it, if you have your clutch cover off, I'll take off the balancer nut. You'll need this removed if you're going to split the cases. I have the tool for that too. The Nikasil is definitely worn on the cylinder, and like Lee said, replating is an option, but a new cylinder is about the same price.

So that's what they meant in the docs for the puller. The one I have is for an RMZ250, but it came with a protective cap for crank ends. Appaerntly it works for CRF 450 cranks too

okay i sent the cylinder and the head off to c and d racing he is gonna let me no about the cylinder if he cant do anything with it thats fine ,we will replace it with a new oem one, gonna wait to order the j e piston untill then
we are gonna have him service the head also
also ordered new oem crank with bearings and seals, so i used a steering wheel puller to pop of the flywheel,
got the frame and control arms back from the sandblasters today ill post pics when i get it painted tomorrow

well its starting to go back together worked myself right out of parts today.