[tbpmusic]

When a 350 is at TDC compression stroke, where does the little pin on the cam end (locating pin for the advancer) point, up or down??
Likewise, where does the mark on the advancer point, up or down??

 

[66Sprint]

It SHOULD be straight up (along the centerline of the cylinders)..... IF I remember correctly..... :? I have an engine I can check to verify later tonight....I'm going to take pics of the 750 forks anyway.....

 

[tbpmusic]

Thanks Steve -

Same for the advancer mark??

Is it even possible to get the cam on 180 degrees off?

 

[66Sprint]

Shouldn't be possible for the cam as you have to rotate the crank and chain to install the shouldered "alignment" bolt after you get the cam into the sprocket and the "setting" bolt in.... The advancer center COULD be 180 out though.......
Of course, IF the chain wasn't installed until after both the bolts are in...................

 

[tbpmusic]

Of course, IF the chain wasn't installed until after both the bolts are in...................

I didn't think about that, you mean with a riveted link , right??

Otherwise, I don't see how you could get it wrong on a 350.......

 

[66Sprint]

... I wonder if they allowed the crank to move off index BEFORE putting the chain on the sprocket(or used the LF mark as the index), then re-aligned only the cam to sprocket to insert the first bolt (in the cam sprocket)... It would require an almost deliberate effort to do it wrong......and I'm sure the pistons hitting valves would be a give-away...????????

I agree, it couldn't be 180 out IF you have a LT mark aligned.... It's the cam that determines if it's on the compression or exhaust stroke... It could be off, but not 180 off.

 

[tbpmusic]

I'm not too sure what's going on here, Steve.
The guy swears that his cam/advancer pin is pointing straight down at TDC left compression.

Like I said, I don't have a 350 here, but from memory I could not see how it is even possible on a 350. It's not like a 450, where it's possible to screw up at almost every turn - it only goes together one way, pretty much.

Probably just another communication problem - I'll continue to work with him and see what happens.....

I just wanted to check with someone who actually has a 350 on-site, rather than rely totally on my memory (which is admittedly showing my age).......

 

[66Sprint]

He may be "feeling" the "compression" with his finger..... Tell him to physically observe the left intake valve.... He might be "feeling" the exhaust "push"......

That's the only thing I can see that would point the pin down....