Timing

[Scottymac]

New guy here so thank u for any help!
1982 xs650
New build, 750 big bore kit
Mikes swr carbs
Mikes pma
Pamco ign no blue box? Not sure model
New coil has 13 v, new battery coming today but old one shows 13v kicking
Float bowls filled, carbs set for initial start.
Valves adjusted, timing chain adjusted
Timing mark set on pma lined up right side of notch at 6:00 see pic with Left cyl visually set at tdc on comp stroke
Home made simple wiring harness. Crimped,solderd, shrink wrapped
Bike turns over nice on starter, kicks over as well but not even a pop. It does have spark.
Rotating counterclockwise tdc mark goes past mark/notch on case and spark plug fires at about 1:30, which is near bottom of piston stroke see pic. Moving timing plate does adjust but obviously no way to make up that many degrees. Pics are all at tdc except one showing where plug fired at 1:30. Any ideas. Thank u, scott

 

[gggGary]

Check the back of the pamco magnet plate are the magnets 60 degrees apart not 90 degrees?
should look like plate bottom center here

Is cam shaft / crank shaft timing correct?

 

[Scottymac]

Looks correct??

 

[Scottymac]

Also, here’s my cam shaft pin position when at tdc. Saw post maybe should be at 6:00?
Crack was not ever out of eng
Thank u!

 

[Jim]

Welcome aboard!!

How are you verifying TDC?

 

[Scottymac]

Cranking counterclockwise, watch intake open and close on left cyl, feeling positive pressure coming out, eyeballing thru spark hole. Not perfect but close enough for a pop if I was in ballpark? Rechecked 5 times

 

[Scottymac]

Watching when piston stopped moving up in that cycle

 

[gggGary]

Also, here’s my cam shaft pin position when at tdc. Saw post maybe should be at 6:00?
Crack was not ever out of eng
Thank u!

yes depending on which piston is on compression TDC the cam pin should be either 12 or 6 o:clock.
NOTE this is revised cuz I f-d up the how the cam sits LOL
This is viewed from left side

you can see the right cylinder is on compression TDC and the cam pin hole is facing up. The slot at the sprocket and the slot are also facing straight up.

 

[Jim]

New build, 750 big bore kit

What's the history... did you build it, or did it come to you that way?
Don't remember if it should be up or down at TDC, but the pin shouldn't be at 9:00. Looks like cam timing is off.

 

[Scottymac]

Thank u for the info. I was thinking cam was off. My friend installed the top end years ago. Gonna pull engine and verify cam timing. Unless anyone here stops me!!!???
Unique bike I started years ago. Need to finish and sell it. Long story. Thanks again for help!

 

[Scottymac]

Here’s the bike

 

[Jim]

Sweet!!
That a '57 wagon behind it?

 

[gggGary]

Yeah motor and cam cover have to come off but head, jugs can stay in place.
by removing the cam chain adjuster and pushing the cam bearings off, letting cam sit lower, you can get enough slack to move the sprocket on the chain. Confirm the valves are sealing before reinstalling motor.

 

[Scottymac]

Sweet!!
That a '57 wagon behind it?

Sedan delivery

 

[Jim]

Recognized the front. Used to have a '57 Ranchero with the 292.

 

[Jim]

Top end buildup from Tech.

https://www.xs650.com/threads/xs650-top-end-buildup.52041/

 

[Scottymac]

Top end buildup from Tech.

https://www.xs650.com/threads/xs650-top-end-buildup.52041/

Awesome thank u

 

[Scottymac]

Recognized the front. Used to have a '57 Ranchero with the 292.

351 here

 

[gggGary]

This (XS650) might be a 277 (rephase) motor?
Check if both sides are TDC at the same time.
Was that ignition already installed?

 

[Jim]

Lovely!!