I must be losing my mind....

I'm deep into tearing down the 400 and have reached the counter shaft sprocket....



It's pressed on to a shaft, just like the workshop manual states. Not sure how I'm going to get the SOB off.

I know it's been almost 50 years, but I would swear that my '72 250CR had its C/S sprocket
on a splined shaft. I distinctly remember bending back the "lock" washer and pulling it off.

How is that possible? Tell me I haven't lost my mind.....yet.

if that is the tapered sprocket that wasted at one point
you will need apullerand headmost importantly,,, patience

Info from HVA Service Bulletin:

"I know it's been almost 50 years, but I would swear that my '72 250CR had its C/S sprocket
on a splined shaft. I distinctly remember bending back the "lock" washer and pulling it off."

Splined shaft showed up in 74 - had a circlip and no 'lock' washer. Splined shaft can be retrofitted to 'big clutch' engines.

Just as I thought, I've officially lost my mind...

This is what the puller looks like.

When trying to get the sprocket off the taper I have applied a puller from HF and while still under tension heated the sprocket. It POPPED but I was not Present. And the shaft with the splines is a nice upgrade.

I haven't figured out how to get the nut off the counter shaft yet. 47 years and it's never been replaced.
It's on there hella tight.

Are you sure your turning it the correct direction?

Based on the workshop manual it's reverse threads.

I went through the same hassle. The swap to the splined shaft is a must-do IMO.

I had a hell of a time with my 73 250 countershaft sprocket too. Not fun. I even put a little never seize on the shaft only a month or two prior to wanting to change the tooth count with a new sprocket. I used a two jaw puller and just cranked down on it every once in a while. As stated above, patience is the key. I just left it on there with the nut backed off just a little and it finally popped when I wasn't around. The nut being close but not quite touching the sprocket is what worked for me.

Use one of those impact guns. Just go the right direction. I think Advance Auto rents them?