Willweepin
XS650 Member
It seems as if I’ve potentially jumped a tooth, or my timing is 180 degrees off.
For the life of my I can not get this timing cam journal off
Last edited:
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1976 XS 650 Crank, no start
- Thread starter Willweepin
- Start date
It seems as if I’ve potentially jumped a tooth, or my timing is 180 degrees off.
For the life of my I can not get this timing cam journal off
Dont forget to check the advance unit on the other side from Points so it is not stuck in advanced position and that the springs
operate pull it advance back
Is the Top DC and marks on rotor correct
operate pull it advance back
Is the Top DC and marks on rotor correct
Willweepin
XS650 Member
TDC on the rotor is correct! Checked using the straw method you told me to use, and double checked with a bore scope.
The springs seem a little weak, but they do return back to the starting position, or very close to it.
The timing pin on the advance is at straight 12 0 clock when in TDC
Did you ever try swapping the plug leads... right on left plug, left on right?
Willweepin
XS650 Member
That's why I wanted you to swap leads. If the points cam was 180° out of time, swapping the leads would have put it in "correct time."
You beat me to my next suggestion! Yes if it's been removed, the points cam CAN be installed "backwards" on the advance shaft.
just went out and snapped a pic
Note how the ring goes towards the engine.
To remove the points plate intact you have to "push the points back get the rub blocks off the cam so they will go past that unground ring.
Willweepin
XS650 Member
I can’t seem to get mine out, the advanced side is also removed.
Edit: Soft mallet did the trick
Attachments
After long period of futile starting attempts, remove the plugs and heat them good with a propane torch. I had "many a hard starter" come to life with freshly dried spark plugs. Also bad "open" plug caps a common issue with old bikes. Stock caps typically ohm out at about 8K ohms somewhere in that range is good replacement caps are usually 5K ohms and that's fine also. THat is using B7ES plugs. If you are using BR7ES plugs you should be using caps with NO resistance.
That's correct orientation, with the disk on the other side removed the advance shaft will come out towards the points. Once out, support the points cam between vice jaws, put a nut loosely on the threads and tap the shaft down to loosen the cam.
Photos can lie but that points cam looks pretty worn at the inboard end.... lets see the points rub blocks (the nylon part that rubs on the cam) also.
Willweepin
XS650 Member
The problem seems to be not being able to rotate the points plate far enough clockwise to get the timing to fire consistently on the F mark.
Willweepin
XS650 Member
Here’s the rub blocks. Too far gone you think?
Edit: I just saw some points for sale, and they look significantly better than mine.
I’ll order some new ones
Attachments
There is a locating pin
Maybe seen there
Maybe seen there
Willweepin
XS650 Member
Hey everyone, update here.
No matter what I do, I can not seem to advance or retard the timing enough to line up with the firing marks.
I’m thinking I jumped a tooth. This thing does have 22k miles on it, and I’m unsure if the timing chain has been serviced.
I just installed new points hoping that would fix the issue since the wipers looked worn.
No dice.
No matter what I do, I can not seem to advance or retard the timing enough to line up with the firing marks.
I’m thinking I jumped a tooth. This thing does have 22k miles on it, and I’m unsure if the timing chain has been serviced.
I just installed new points hoping that would fix the issue since the wipers looked worn.
No dice.
Attachments
How to find if off one tooth
Willweepin
XS650 Member
I watched this video as well, it doesn't seem like it. But I'll look again tomorrow.
It's really quick and simple to check camshaft timing on one inlet valve using a DTI. Here's how -
Post in thread 'Camshaft timing - Is my engine timed one crankshaft tooth out?' https://www.xs650.com/threads/camsh...ed-one-crankshaft-tooth-out.66347/post-838935
It's going to be very obvious if the camshaft timing isn't correct doing a check this way.
Post in thread 'Camshaft timing - Is my engine timed one crankshaft tooth out?' https://www.xs650.com/threads/camsh...ed-one-crankshaft-tooth-out.66347/post-838935
It's going to be very obvious if the camshaft timing isn't correct doing a check this way.
He did say in the video ,it ran even though one tooth off but poorly
How about the locating pins for the holders
https://www.xs650.com/threads/timing-troubles-and-identification-help.50700/
How about the locating pins for the holders
https://www.xs650.com/threads/timing-troubles-and-identification-help.50700/
Hotrods316
XS650 Member
Okay sorry for bugging this thread but the ring goes on the inside towards the engine with no ring/lip on the outside? My points plate just slid off. Sorry I’m cornfused by this messge
