Top end rebuild questions..

[drkilldrmz]

Hello again. I pulled apart the ytm200 top end this weekend to get the oil seals replaced. Im learning as i go on this one. Anyhow, after removing the head, and getting everything apart, the Dowers that hold the rockers in were a Bear to take out. I fabricated a puller of sorts and got them out finally. Now.. Im getting ready to put it all back together and see if i can get it timed up, but those dowels, ( or whatever they are caller.. Arms maybe) won't go in quite far enough for the head bolts to pass down thru. 2 go in, and the 2 that need to pass by the "Arms" dont. I don't want to hit them with a hammer and punch any more than i already have. , but i really cant figure out how to get them in there any deeper. Any tricks would be appreciated.. thanks.

[MudBug]

is there a spot for a screwdriver on one end of each one?

[drkilldrmz]

on one there is. and on one there is not. I get what your asking.. One of them was notched at the end. I will spin it if i can, but they are very-very tight, and it was a task to get them out to begin with. the other non notched one was even tighter than the first, and it it wont drop in all the way either..

[harryredtrike]

see if you can pull them back out.clean the dowel's and the holes,very well. doing this will help out tremendously.they are still tight but should seat fairly easily.

[MonroeMike]

I stuck my rocker arm shafts in the freezer, before I installed them.

[drkilldrmz]

Thanks for the advice everyone. Managed to struggle them in there. I learned that the bolts are threaded with a 6mm on top, so .. if you bottom out a screw in there, and grab the ends with grips, and wiggle back and forth, they will eventually go in there. I guess i should be happy they are so tight. less wear eh? I did break a bolt on the timing chain cover, so i will have that drilled tomorrow, then get it timed, and hope she is smoke free. If not, off it all comes again for an oil ring..Compression readings are 160 all day.

[85Tecate]

Thanks for the advice everyone. Managed to struggle them in there. I learned that the bolts are threaded with a 6mm on top, so .. if you bottom out a screw in there, and grab the ends with grips, and wiggle back and forth, they will eventually go in there. I guess i should be happy they are so tight. less wear eh? I did break a bolt on the timing chain cover, so i will have that drilled tomorrow, then get it timed, and hope she is smoke free. If not, off it all comes again for an oil ring..Compression readings are 160 all day.

WAIT stop! If you got the head off.....PUT RINGS IN IT. If you gotta pull it apart again you really need to replace the headgasket again........ Its only 30 bucks for rings....Do it!

[drkilldrmz]

Really? It takes forever for the darn things to arrive from fleabay. No local dealer messes with ths stuff. I figured because the compression was so good, all it could possibly be is the oil seals. Cyl looks totally scratch free from what i can see without pulling the cyl out...EDIT.. And i guess i don't know if it's the stock stuff still in there. Nothing appears to have been bored, but how do we know this?.. Im still learning about these 4 strokers. Thanks.
(I need to have a statement beneath my posts...Im not an idiot, really..)

[85Tecate]

Compression has nothing to do with oil rings. Thats why there are 2 COMPRESSION rings and an OIL ring. Either or would be bad. If it were me, i would hone the cylinder and put a set of rings in it.....Why wouldnt you if its tore apart? its your machine do as you wish im just saying what i would do.

you could also find a broken ring and a scored cylinder wall is causing the oil smoke.....You never know until you check./

you take it to a machine shop or a local atv dealer/bike dealer any of them can mic a cylinder for you. Then just match it up with std bore and see if its the same.

also, on top of some pistons you will see numbers or STD marked in the top of it. This will tell you the piston size. Some pistons arent like that so if yours isnt, dont freak out.