Topic: valve seal install

[Aaron Richard]

Is there a way to change these without taking the head off? If not, does the cam chain have to be broken apart to lift the head off? Haven't dug into the motor this deep yet, An want to make it as painless as possible  

[Bodain]

Hmmm. To change a valve seal. You have to remove keepers, and valve spring. Even if this could be accomplished with head on. The valve would drop onto the pistons. This would be more grief than you can imagine. Take the head off and use a valve spring compression tools.

The cam chain just comes off the cam, without breaking it.

[Aaron Richard]

ok sounds good. My main thing was I diddn't have to break the chain. If I can just slide it off, I'll take the head off.
Thanks

[MCRider]

Is there a way to change these without taking the head off? If not, does the cam chain have to be broken apart to lift the head off? Haven't dug into the motor this deep yet, An want to make it as painless as possible  

I have changed mine on my CB750 motor in the past, along with the valve springs. I took the hi perf ones out and replaced with stockers. Motor in frame (rail removal kit), head on,  used an external valve spring compressor common for cars.

Just set each cylinder at top dead center as you do them, one at a time. The valve will only drop a skosh til it hits the piston, and the rest of the job was easy.

[Aaron Richard]

Is there a way to change these without taking the head off? If not, does the cam chain have to be broken apart to lift the head off? Haven't dug into the motor this deep yet, An want to make it as painless as possible  

I have changed mine on my CB750 motor in the past, along with the valve springs. I took the hi perf ones out and replaced with stockers. Motor in frame (rail removal kit), head on,  used an external valve spring compressor common for cars.

Just set each cylinder at top dead center as you do them, one at a time. The valve will only drop a skosh til it hits the piston, and the rest of the job was easy.

I thought that may be posible to do it that way but, didn't know if the piston went up far enough to keep the valve up. Maybe I'll try it that way first and if it doesn't work out, I'll take the head off.

[MCRider]

Is there a way to change these without taking the head off? If not, does the cam chain have to be broken apart to lift the head off? Haven't dug into the motor this deep yet, An want to make it as painless as possible  

I have changed mine on my CB750 motor in the past, along with the valve springs. I took the hi perf ones out and replaced with stockers. Motor in frame (rail removal kit), head on,  used an external valve spring compressor common for cars.

Just set each cylinder at top dead center as you do them, one at a time. The valve will only drop a skosh til it hits the piston, and the rest of the job was easy.

I thought that may be posible to do it that way but, didn't know if the piston went up far enough to keep the valve up. Maybe I'll try it that way first and if it doesn't work out, I'll take the head off.

It will only drop 1/8" or so, hate disturbing an otherwise OK head gasket, assuming yours isn't leaking.  But if you're up to it, pull the head and lap the valves in. Freshen it up a bit.