Bit of an update.
So I’m basically back where this thread started
I put the top end back together with new left side crank seal, piston pin, circlips and bearing.

I attempted to set the timing again with the bulb and for the life of me can’t get it to 1.8 BTDC. So I just made sure the points were within spec at the most open point I found.
The bike starts and idles fine at 1500rpm but still has the “rattle” noise mentioned earlier and heard on the videos.

Took it back out for a ride and still has hesitation/misfire at about 4krpm and above.

Is this timing related? Carb?
Pilot air screw is out 1 3/4 on the carb.

Why can't you get timing set?

Mark,

So I have a bulb with 2 wires coming out of it.
1 straight to the black wire off the magneto and the other to the positive of the battery.
When I plug those 2 in the bulb lights up.

As I move the flywheel counterclockwise I find TDC and then move the flywheel counterclockwise I’m trying to get the light to just dim a bit at 1.8mm BTDC. I have moved the points every which way I could but can’t get the points to just start opening at that point (1.8 BTDC which would have the bulb dim)

Is my process correct?

Can you get the bulb to dim at all? Is that the problem?

Otherwise, your process is a little off...

1. Find TDC with dial indicator.
2. Rotate engine clockwise to 1.8mm BTDC... note where that is on the dial indicator... then rotate the engine a little further clockwise to maybe 2 or 2.5 mm BTDC
3. Now rotate the engine counter-clockwise slowly. The light should dim just as dial indicator shows you're at 1.8mm BTDC.
4. Rotate clockwise and counterclockwise and watch the light get bright as you go clockwise and then dim again as you come back counterclockwise to 1.8mm

Tip: If points are opening (light just dims when rotating counterclockwise) before 1.8mm BTDC, narrow the point gap slightly. If points are opening after 1.8mm BTDC... closer to TDC... then open the point gap slightly. It might take a few tries, but you'll get it...

P.S. I always tighten the point screw after adjusting because if you just "snug it" and get it set, 9 times out of 10 the points will move when you tighten the screw and you'll have to readjust again.

Thanks much mark

I think the tip will definitely help me get there.
To confirm is this correct?


My dial indicator is in inches so 1.8mm = .07 in
You can see on the picture the piston is at TDC so from there I go back to .07 and at that point on the dial indicator is when the points should just begin to open ( bulb should dim)

Thanks again

Nice picture!!!

Yes, but go past 0.070" back (clockwise) to "zero" (actually 0.100") and then rotate crank in normal direction of rotation (counterclockwise) back towards 0.070" and see where light dims.

If the timing is *really* advanced, you might even have to rotate it further backwards... but not too likely.

Also remember when you set your timing and recheck it that you have the advance mechanism is in the fully advanced position.

Thanks guys,
So I was able to get the timing correct!
But I still have the misfire/breakup/ hesitation when riding the bike under load. Again it starts up and idles well

What should I check for next?
Here is the spark plug, could it be too much oil?


I tried leaning at the carb but didn’t help any, the spark plug was a tiny bit wet.

Did a compression test, got 100psi with open full throttle, 6 kicks and cold engine

Easiest thing to try first is a brand new plug bought from a reputable source or better is a known good plug of the same part number from another bike.

Second is to pay close attention to where the throttle is as far as how far open when it acts up. That plug looks very rich and fairly new.

How is your air filter?