Author Topic: Static timing question... can't get marks to line up-- 74 cb550k  (Read 7888 times)

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Offline Scott S

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Re: Static timing question... can't get marks to line up-- 74 cb550k
« Reply #50 on: March 04, 2017, 04:37:35 AM »
 Just slap a Pamco on it and be done. ;)
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Offline Deltarider

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Re: Static timing question... can't get marks to line up-- 74 cb550k
« Reply #51 on: March 04, 2017, 07:21:22 AM »
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Just slap a Pamco on it and be done. ;)
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Offline Scott S

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Re: Static timing question... can't get marks to line up-- 74 cb550k
« Reply #52 on: March 04, 2017, 11:09:42 AM »
Quote
Just slap a Pamco on it and be done. ;)
I always suggest: not before we've learned something.


 Fair enough. And a valid point.
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Offline HondaMan

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Re: Static timing question... can't get marks to line up-- 74 cb550k
« Reply #53 on: March 04, 2017, 10:27:23 PM »
Quote
OK,  a little deeper: When you rev the engine up, does the timing go past the full-advance marks? If not when they are set too early, the spark advancer is not moving correctly.
At the moment he doesn't succeed to get his motor running. Hondaman, what you wrote about the advancer, does that go for both Hitachi and Toyo (TEC) advancers? I ask because I have two Toyo (TEC) advancers here and they don't seem to have so many shims. On mine there's one thin one only. His is also a Toyo (TEC). I'm afraid he has to go through the gapping procedure once more. Check everything like if you really are using the right feeler gauges (0,3-0,4 mm or 0.012-0.016) and you measure with the cam in the right (at it highest) position.
Looking at the pic again... personally I would like to see that center 6mm bolt right in the middle of that slotted hole in the big hex but I am not quite sure that will make all the difference.

On all of the advancers (Fours and Twins alike), regardless of TOYO, TEC, Hitachi, or ND types, they must have at least 2 shims. This is due to the nature of the design: with just one, the shim can (and will) bind between the cam and the plate base. There may be as many as 4 (usually on the CB350 Twin), but they seldom got oiled per the Shop Manual's instructions, and indeed after 1975 this instruction no longer even appeared in the Shop Manuals for the bikes (this was after American Honda started re-translating the Japanese manuals, in the USA). I often found the ground-up shims laying in the bottom of the points case on the 750 and 500/550 bike, even in the 1970s. At first, I did not understand what this debris was: it wasn't until 1980 when I rebuilt my own 750 the first time that I discovered it.
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Offline PeWe

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Re: Static timing question... can't get marks to line up-- 74 cb550k
« Reply #54 on: March 05, 2017, 02:50:33 AM »
Pamco must have correct environment to work as well as the points.
I started with a Pamco ignition. Bike had way too early advance. I had thoughts that the ignition without points will advance easier due to no counter force as the points must apply.
I read on this forum and found Hondaman's recommendation to cut the springs 1/2 wound and reshape the cut end. I did that and problem solved. Full advance changed from 1500 to 2600-2700 rpm.

Points have the advantage that both 1-4 and 2-3 can be adjusted. Pamco and Dyna are both set with base plate turned to get 1-4 correct, 2-3 will follow. If stud is bent, 2-3 will be wrong. Points can be set correct anyway as long it is not bent beyond adjustment.

I'll test points only on my K2 for nostalgic reason. I have 3 sets of NOS TEC points and a box with 10 Koyo capacitors that look very old to be mounted on my old saved baseplates. Most of them Daichii. I might have one TEC.
I have a Dyna-S I can use too. Plus a burnt Pamco, 2-3 electronics just popped.
I think I'll use points that can be trusted. The K2 will be my touring bike since my K6 is too modified and good looking :)
« Last Edit: March 05, 2017, 02:52:51 AM by PeWe »
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Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
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http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
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Offline Deltarider

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Re: Static timing question... can't get marks to line up-- 74 cb550k
« Reply #55 on: March 05, 2017, 06:09:13 AM »
Quote
Points have the advantage that both 1-4 and 2-3 can be adjusted. Pamco and Dyna are both set with base plate turned to get 1-4 correct, 2-3 will follow. If stud is bent, 2-3 will be wrong. Points can be set correct anyway as long it is not bent beyond adjustment.
That's exactly what I have against full electronic ignitions and I don't know if it was in this forum or another where somebody had discovered that the part that commands the control current (can't think of the word right now, rotor?) had a 1,5-2o degree built inaccuracy between 1+4 and 2+3. Some 15 years ago I made my own transistorized ignition (copycat of a proven design x2) which has proved 100% reliable and the contactbreakers have now served 55.000+ kms and are still in good condition. BTW, that's the charme of Hondaman's and my transistor ignition module. In the unlikely event it breakes down, you can return to the old style within 5 minutes.
Now a few words about 'set and forget' that all EI manufacturers advertised with and which has always been happily echoed by their customers. BTW, that's the secret of advertisement: start with telling there's a problem and that you can offer the solution and advertisement is at it's best when customers start repeating your slogans. As if there ever was a problem... I can tell you from experience that, even with 100% old style you could do tens of thousands of kilometers before you would need to look at them. Essential is that every now and then you check if that little felt is still lubed.
Quote
I'll test points only on my K2 for nostalgic reason. I have 3 sets of NOS TEC points and a box with 10 Koyo capacitors that look very old to be mounted on my old saved baseplates. Most of them Daichii. I might have one TEC.
Pewe, maybe you could test Daiichi points for us. I can't believe they are that bad as often has been stated here. In Europe they're traded a lot and I wonder if there's maybe a quality difference between the Daiichi points here (made in Japan) and in the US. I wouldn't be surprised if the latter are counterfeit (China made?) Daiichi overthere.
« Last Edit: March 05, 2017, 09:55:57 AM by Deltarider »
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Offline PeWe

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Re: Static timing question... can't get marks to line up-- 74 cb550k
« Reply #56 on: March 05, 2017, 06:37:12 AM »
I have used Daichii points most of the time. It was when reading this forum I got an aha moment when I remembered some issues.
Adust igntion and tighten the screws and it change rather much. Needed some extra time to get it right.

I had a new complete base plate installed. Later that summer I took the bike for a holiday from Sweden (100km west of Stockholm) down to Tarragona Spain. (Ferry between Gothenburg-Kiel). On the way back home in France the bike suddenly ran on 2 cyl only. Checked the ignition since I felt which pipes that were cold and found one point to be broken, the bakelit part against rotor. Rode the bike to a nearby Honda shop where they could repair the point. CB750 parts were not available.

I remember flashing points. I had a transparent cover so the points were visible in the dark. Maybe a little bit too much arcing. Point contact area not that good since they did not close with both sides really mating each over, bent sideways. Capacitors bad a little bit too quick.

But, Daichii will work as it did before and cost half than TEC or maybe less.
« Last Edit: March 05, 2017, 06:51:39 AM by PeWe »
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline jonda500

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Re: Static timing question... can't get marks to line up-- 74 cb550k
« Reply #57 on: March 05, 2017, 03:57:18 PM »
I got two Daiichi points/plate sets off ebay in 2012 for $15 each. They are made in Japan. Both sets now have thousands of trouble free miles on them. The point faces meet squarely but aren't 100% perfectly aligned - but all they have to do is make and break contact! I've seen genuine ones that weren't 100% perfect too.

The genuine Honda tune up kit I bought for my original 500 was over $100- I just couldn't justify spending that much on my other two hondas.
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Offline kippstakes

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Re: Static timing question... can't get marks to line up-- 74 cb550k
« Reply #58 on: March 06, 2017, 08:59:42 AM »
Looks like you're super close. Lemme ask you this, where are you gapping the points? When they are widest in a rotation is when you're supposed to. Try gapping them again (like three times) and see if you can get it a bit closer. I have had these exact problems before and only resolved itself after the try and try again method 🙄🔫. If you can't get it there by my next day off I'll post a vid to this page giving a how to. And will send my cell# so you can vid what you're doing and maybe I can pick it out. Goodluck man

I've been gapping them at their widest, yes. I'm actually able to get the F mark aligned, but now the bike won't start. I'm starting from scratch, resetting everything, starting the bike (to rule out fuel delivery problems- spark tested good yesterday), and doing the process over again.
Thank you
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Offline kippstakes

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Re: Static timing question... can't get marks to line up-- 74 cb550k
« Reply #59 on: March 06, 2017, 09:10:35 AM »
OK,  a little deeper: When you rev the engine up, does the timing go past the full-advance marks? If not when they are set too early, the spark advancer is not moving correctly. This is common: there are some thin shims under the points cam, minimum 2 to reduce friction. Many are gone today, as some were made from plastic which wore itself away. These shims make the points cam sit squarely on the post so the timing stays correct. When they are missing, the timing usually over-advances at low engine speeds, or it sometimes jams the advancer and won't let it advance at all (or only partway). The first check for this is: use feeler gages to test test clearance between the face of the points cam itself and the back of that big nut. It should be in the range of 0.002"-0.006", no more than 0.008". If it is more than this, you will need to make some new shims. They can be made with a sharp blade and thin brass sheet (like 0.002" thick sheet), and there must be at least 2 as one will jam and drag (much like none).

The other thing that comes to mind here: the O-rings in the carb castings that bolt to the head of the 500/550/350F/400F engines have rubber O-rings in the engine side. These get hard from heat and years, and no longer seal. This will make starting and low-RPM performance poor, and carb adjustments difficult at best. On the 500/550 engine, these O-rings are the same size as the ones inside the valve caps. Often, a hard-starting 500/550 has leaking O-rings here.

Thank you for the deeper troubleshooting tip, I have the day off to throw myself at this thing so I'm going to check the clearance as you said and go from there.
The carbs should be fine, I installed new o-rings about a year ago, and it was pulling good vacuum across all four last time I synced her up.
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Offline kippstakes

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Re: Static timing question... can't get marks to line up-- 74 cb550k
« Reply #60 on: March 06, 2017, 09:12:41 AM »
Quote
OK,  a little deeper: When you rev the engine up, does the timing go past the full-advance marks? If not when they are set too early, the spark advancer is not moving correctly.
At the moment he doesn't succeed to get his motor running. Hondaman, what you wrote about the advancer, does that go for both Hitachi and Toyo (TEC) advancers? I ask because I have two Toyo (TEC) advancers here and they don't seem to have so many shims. On mine there's one thin one only. His is also a Toyo (TEC). I'm afraid he has to go through the gapping procedure once more. Check everything like if you really are using the right feeler gauges (0,3-0,4 mm or 0.012-0.016) and you measure with the cam in the right (at it highest) position.
Looking at the pic again... personally I would like to see that center 6mm bolt right in the middle of that slotted hole in the big hex but I am not quite sure that will make all the difference.

I don't mind gapping-- I'll happily gap that thing 100 times if that's what it takes to get it straightened out. I re-centered the 6mm bolt, just to be on the safe side. It looks fairly squared up now.
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Offline kippstakes

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Re: Static timing question... can't get marks to line up-- 74 cb550k
« Reply #61 on: March 08, 2017, 10:05:27 AM »
Okay so here's where I now stand:
Let me first say that the bike has spark x4, nice wet plugs, and will still not start aside from an occosional sputter.
I have shimmed the spark advance so that it is sitting nearer to the 'big bolt'. No change.
I have reset the gap at least 30 times- and re-cleaned them repeatedly, experimenting with different clearances ranging from .25mm up to .40mm, with no change in performance.
I seem to be able to time the 1/4 plate, but the 2/3 plate doesn't seem to have enough travel to make it to the F mark... I can baaarely sneak it in when the points are set extremely close, but it seems extreme... and the bike still doesn't run.
(Just a reminder, the bike fired up and ran fairly well on the first or second kick consistently before I decided to assess the timing situation)
I am simply perplexed. Considering my fuel delivery/spark situation, it almost has to be a timing issue, and from the experience I've had during this endeavor the issue is almost certainly in the points.
Is there anything I haven't tried here? I've been wrenching on this thing for 7 years and this is the first time I'm actually considering trailering her to a mechanic, which makes me want to claw my eyes out.
Thank you all
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Offline Deltarider

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Re: Static timing question... can't get marks to line up-- 74 cb550k
« Reply #62 on: March 08, 2017, 02:43:43 PM »
Kippstakes, just to make sure, the mark that has to be aligned for setting the timing (static) is the yellow mark in my picture (5o). Forgive me for bringing this up, but I thought I'd better ask after looking at the photo in your Reply #39 where the double marks of total advance line up with the case mark. I suppose that's a coincidence but we must be sure. Another thing. After I studied your photo's once more, I'd like you to do a simple test with the ignition off. First, have some plastic, business card or whatever between both sets of breakerpoints (left, 1+4 as well as right, 2+3) so both sets are isolated (both are open as it were). Then hold one probe of your ohmmeter against the spade connectors at breakerpoint 1+4 and the other against the groundplate and see if these spade connectors accidentely ground. Repeat with 2+3. Please report back.
« Last Edit: March 08, 2017, 11:57:35 PM by Deltarider »
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Offline kippstakes

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Re: Static timing question... can't get marks to line up-- 74 cb550k
« Reply #63 on: March 15, 2017, 10:46:28 PM »
Kippstakes, just to make sure, the mark that has to be aligned for setting the timing (static) is the yellow mark in my picture (5o). Forgive me for bringing this up, but I thought I'd better ask after looking at the photo in your Reply #39 where the double marks of total advance line up with the case mark. I suppose that's a coincidence but we must be sure. Another thing. After I studied your photo's once more, I'd like you to do a simple test with the ignition off. First, have some plastic, business card or whatever between both sets of breakerpoints (left, 1+4 as well as right, 2+3) so both sets are isolated (both are open as it were). Then hold one probe of your ohmmeter against the spade connectors at breakerpoint 1+4 and the other against the groundplate and see if these spade connectors accidentely ground. Repeat with 2+3. Please report back.

I inserted cardboard bits in the points and it looks like no grounds are being made-- my light stays on throughout the crank rotation.
However, I did get the bike to start the other day, with more kicking than I would expect to have to do. This happened after it dawned on me that both points don't have to be the gapped the same, and one might adjust each breaker to change timing. It worked, but the bike still starts hard, and wouldn't start yesterday. Something is still wrong.
I will keep at it.
Thank you
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Offline old74

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Re: Static timing question... can't get marks to line up-- 74 cb550k
« Reply #64 on: August 06, 2017, 09:25:13 AM »
Was reading this the other night and the timing mark issue described is exactly what my 74 was doing.  Thanks to several members that correctly described setting the points gap by adding the 1/4 clockwise turn on the cam.  I was following my Clymer manual and it kept giving me the same results that Kippstakes was getting.  I was going crazy.  Anyhow, just wanted to say thanks to all.  My old 74 cb550 is purring like a kitten (after sitting 20 years) and I can move on to selling this old beast.

Just curious Kippstakes - did you ever get you problem solved?

Offline Redline it

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Re: Static timing question... can't get marks to line up-- 74 cb550k
« Reply #65 on: August 08, 2017, 11:27:42 PM »
Kippstakes, just to make sure, the mark that has to be aligned for setting the timing (static) is the yellow mark in my picture (5o). Forgive me for bringing this up, but I thought I'd better ask after looking at the photo in your Reply #39 where the double marks of total advance line up with the case mark. I suppose that's a coincidence but we must be sure. Another thing. After I studied your photo's once more, I'd like you to do a simple test with the ignition off. First, have some plastic, business card or whatever between both sets of breakerpoints (left, 1+4 as well as right, 2+3) so both sets are isolated (both are open as it were). Then hold one probe of your ohmmeter against the spade connectors at breakerpoint 1+4 and the other against the groundplate and see if these spade connectors accidentely ground. Repeat with 2+3. Please report back.

I inserted cardboard bits in the points and it looks like no grounds are being made-- my light stays on throughout the crank rotation.
However, I did get the bike to start the other day, with more kicking than I would expect to have to do. This happened after it dawned on me that both points don't have to be the gapped the same, and one might adjust each breaker to change timing. It worked, but the bike still starts hard, and wouldn't start yesterday. Something is still wrong.
I will keep at it.
Thank you

Kippstakes, I've been going through the same situation over the last year. i'll try to adjust points 1/4 and then after getting that, i'll go to the plate setting for timing and it's on the max advance mark or close to it. I can bump the plate up and it get's kind of close but still off too far that adjustments don't work anymore, if I go back and try to set the points again, then the plate, same thing.I found out yesterday, that to set the 1/4 points and the timing of the 1/4 side of the plate, the only way i could figure it out was by not shimming nothing, as that would add another task to the procedure and i wanted to set the disc as it  rest' naturally in it's recess, i knew there had to be a why to do it. So it occurred to me that loosening the plate threw in too many angles of change, both sets of point cam lobes that change with the advancer  and rotation of the crankshaft, would mean a consistent error that i could not figure out, and I could not get the F mark to come back to the mark in the case. so to eliminate that step of loosening the plate, I took into consideration where the recommended procedure left the F mark, it was far advanced. so I thought I'll set the plate first only I'll set it retarded as much as it was ending up in the advanced position, and then I went back to the 1/4 points and the dwell I think was around 35'. so as I was closing that while holding a timing light on the timing change from the points adjustments alone the F mark lined up with the case mark and i was at 51' dwell. I cinched the plate and 1/4 points and they were correct and solid. Now by getting the f mark on it's case mark, changing, any setting on the 3/4 timing plate and dwell would not alter the locked in 1/4 points and timing, then in the morning it took less than a minute to put the dwell and timing of #3/4 exactly as 1/4. it worked, in the past 30 yrs on this bike,  I ride it constantly, never synced it, no leak down test. when getting the timing in tune by standard procedures it was pain in the but, with this new way, i realized what matters the most is "where" I was at the end as far as the dwell and timing positions, and  "How" I got there was just an easier way, to get control of the F mark, the bike runs very well now. this way would of been a better way for the manual instructions, than what the current instructions read. try it, you'll be surprised on how easy and accurate it is. dwell meter and strobe timing light. that's all.