My noob question thread.

FatChance

FatChance

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Hi,

I don't want to create a build thread because I don't know what I'm building or doing for that matter, might start that once I get to the assembly part. In the meantime I figure it's better to just put all my noob questions in one thread vice popping them out there whack a mole style.

Here is my latest question. I noticed play in the cam and was wondering if this is normal and would go away when fully reassembled? In the video you can see I have 1/8, maybe a little more play.

Charley

 
Push both sets of the cams bearings in towards the middle and see what you have. There is a little play there that can cause an oil leak at the cam end seals if they aren't pushed in as far as they can go.

Cam gear centered in the cam gear tunnel, both sets of bearings pushed in toward the middle. Other opinions may vary.......
 
Your play is because the points and advance covers aren't installed. They hold the bearings tight against the cam... reducing play to almost nil.
 
Yes, the bearings need to be driven in as far as they'll go on each end of the cam. That will eliminate that side to side play. I know it looks wrong because the inner bearing will hang off the "seat" in the casting some, but that's how it's supposed to be .....

CAUaj9S.jpg


Then you center the cam in the head. You can do so by installing the advance/points housings like Jim said, or measure the inset of the outer bearing on each side and make it the same .....

i1iiEYS.jpg
 
Last edited:
Thanks @5twins. Two more valve springs to pull and the top end is ready for a long overdue cleaning and refresh.
 
Pulling the top end off I noticed these trashed plastic seals on the stud bolts. Couldn’t find them in the parts fiche and didn’t see them used in a couple built videos I watched. Anyone have a source or part number for them?

81A3C2FE-0517-4F38-8A12-D157B9BC2442.jpeg
 
I've never seen those rubber washers leaking but the big issue with them is they allow the nuts on those studs to come loose all the time. It's common practice to replace them with brass or copper washers. Those 4 outer studs flow oil so you need some sort of sealing washer under their acorn nuts. While the rubber works, it's too soft for the nuts to stay tight against. Copper or brass is soft enough to seal but hard enough to keep the nuts tight .....

BVWCAkd.jpg


Now that you have a 650, you will, no doubt, be noticing and taking a closer look at any you happen to encounter while out and about. You're going to notice that many have leaking head gaskets. Those stock rubber washers on the 4 outside studs allowing the acorn nuts to loosen up is a major contributor to this.
 
The washers need to be 1/8" or 3mm thick. If significantly thinner the acorn nuts may not have sufficient room at the top to accomodate all the stud thread when tightened up. I made my own from 1/8" brass but from what others say they are quite easy to get hold of.

Best of luck with the build.
 
Hi,

Is this the normal wire routing for the rear blinker? Noticed it sticks out a bit with the seat on.

066FE82D-F0DA-4524-84E1-B0E225A809EB.jpeg
 

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