Author Topic: Bike won't start, please help!  (Read 1304 times)

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Offline minimo

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Re: Bike won't start, please help!
« Reply #25 on: December 19, 2019, 03:45:59 PM »
Are you sure you’re getting spark across all 4 plugs?
Sometimes I pull the plug boots off and snip off about an 1/8” off of the ends to maintain a fresh connection; spark wires to the boots to the plugs.

Did you confirm spark across all 4 plugs?

If I were you, to rule it out, I’d rebuild the carbs and insure that all Jets and Floats, seats and o-rings are fitted and adjusted nicely. Also make sure you’re consistent on your air/fuel mix screws.
« Last Edit: December 19, 2019, 10:50:24 PM by minimo »

Offline Gene

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Re: Bike won't start, please help!
« Reply #26 on: December 19, 2019, 03:52:50 PM »
Put the points back on and see if that solves it. Just so you can mark it off the list.
*1973 CB750K3 (Bow)

Offline minimo

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Bike won't start, please help!
« Reply #27 on: December 19, 2019, 04:04:14 PM »
Also, on the Dyna S, make sure that the magnet is facing the correct direction - #7 on the following instructions:

https://articles.sohc4.net/Performance/DynaS_Ignition_Installation.PDF

Quote
A magnet approximately 1/4 inch in diameter will be noticed on one side of the rotor. The magnet must face to the left when the 1/4 side on the advance assembly is pointing up...

This magnet is usually the round casting mark on the Dyna S rotor. Put something steel on it to make sure it is magnetic.

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« Last Edit: December 19, 2019, 04:08:27 PM by minimo »

Offline Jonm99

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Re: Bike won't start, please help!
« Reply #28 on: December 20, 2019, 07:25:30 AM »
And we have fire! Apparently, timing on the 1-4 cylinders was off. When I set it, I lined up with the advance mark while twisting the magnet forward, but what I did not do was check that the timing light lights up on F without me twisting the magnet. I could not get them both spot on, F is perfect now, T close enough, I suppose.

Thank you so much everyone for your help in figuring this one out.

Regarding the choke, the set screw is not engaging with the cam even when I've screwed the set bolt out to the max (anymore and it will fall out of the nut). I suppose I could simply swap the bolt for a longer one, but I wonder if I'm just tackling the symptom and not the problem. I don't think this was a problem before; is there any other adjustment I am missing that could impact distance from the set screw fitting and throttle cam?
1977 cb750k with original airbox, PD41a carbs, slow jets=35, main jets=120, Delkevic 4in1 headers, 18" Cone engineering QC muffler, 7" headlight, dynatek ignition, ss r/r, clip ons, and ebc front brake rotor. All the rest stock, for now. First restoration, lots to learn!