Author Topic: Tuning-Or trying to  (Read 775 times)

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Offline Phoenix

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Tuning-Or trying to
« on: July 12, 2018, 06:38:42 PM »
Stock except 836 kit and H/M ignition.  Brand new plugs.
Adjusted dwell with a meter.  When I tried the timing light, instead of seeing the "F" as I should have, I saw the "1" in 1-4 and the "2" in 2-4 after moving the plate as far clockwise as it would go.  Points and plate are TEC.  When I went to run it, some of the time it would run up thru the gears, it worked fine.  I was hitting it hard.  Most of the time it would pop and miss out, in any gear, when less than 3000 rpm.  Like when going from stoplight to stoplight.  Does any of this make any sense.  I'm sick of pissing my summer away trying to get my steed to run.
Ed Spengeman
Indy
1971 CB750K1 (Stock)
1973 CB350 Twin  (Gone)

Offline seanbarney41

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Re: Tuning-Or trying to
« Reply #1 on: July 12, 2018, 06:57:28 PM »
If you have not already, make sure your advancer works properly.   And as Cal mentioned, make sure it is assembled properly.
If it works good, it looks good...

Offline Phoenix

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Re: Tuning-Or trying to
« Reply #2 on: July 13, 2018, 08:34:54 AM »
Thanks for the responses.  I just put the engine back together after having the head off.  This is leading me to believe I might have been 180 degrees off when I timed the cam.  I guess there is no way to check that short of taking it apart again.  I could swear I checked it before locking it up but you what thats worth.  I'll keep you posted.
Ed Spengeman
Indy
1971 CB750K1 (Stock)
1973 CB350 Twin  (Gone)

Offline Phoenix

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Re: Tuning-Or trying to
« Reply #3 on: July 13, 2018, 09:43:43 AM »
Cal
Do you realize what you just saved me.  I was all set to jump back in.  I haven't touched the cam plate you are showing.  I had it off about four years ago to check the advance but not since.  I replaced the points and plate about two years ago when I went to H/M's ignition.  So based on that, how come I can't adjust the plate far enough to get to "F" when I time it.
Ed Spengeman
Indy
1971 CB750K1 (Stock)
1973 CB350 Twin  (Gone)

Offline scottly

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Re: Tuning-Or trying to
« Reply #4 on: July 13, 2018, 09:56:39 AM »
The point gap is probably too large. Reset it to .012".
If the point cam is 180* out, like flyin900's was, the motor won't run at all, Cal. ::)
Don't fix it if it ain't broke!
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Offline Phoenix

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Re: Tuning-Or trying to
« Reply #5 on: July 13, 2018, 10:34:32 AM »
What dwell would that be?
Ed Spengeman
Indy
1971 CB750K1 (Stock)
1973 CB350 Twin  (Gone)

Offline TwoTired

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Re: Tuning-Or trying to
« Reply #6 on: July 13, 2018, 11:23:45 AM »
What dwell would that be?

The actual dwell is 190 degrees (point closure timing).  Most dwell meters have their own interpretation.  Most popular seems to be about 47 degrees.

This was found by carefully setting the point gap on brand new points and noting what is displayed on the dwell meter.

Cheers,
Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

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Offline Phoenix

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Re: Tuning-Or trying to
« Reply #7 on: July 13, 2018, 06:09:27 PM »
Well, I adjusted the points so I could time it at the "F" mark.  The gaps came out to 11 to 12.  Still missing out like a bandit.
Ed Spengeman
Indy
1971 CB750K1 (Stock)
1973 CB350 Twin  (Gone)

Offline scottly

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Re: Tuning-Or trying to
« Reply #8 on: July 13, 2018, 08:08:55 PM »
Now that your timing is properly set, when did the "missing" start? Define "missing"; to me, that means a cylinder sometimes doesn't fire, but does fire most of the time.
First thing I would do is remove the spark plugs and examine the tips. Pics might help with the diagnosis. ;)
Don't fix it if it ain't broke!
Helmets save brains. Always wear one and ride like everyone is trying to kill you....