[Bugman]

I swapped an Evo CV onto my 74" Shovel. It starts and runs fantastic, except for a low speed ping I can't get rid of. It happens just as I'm pulling away from a stop sign, or in other very low RPM/high load situations. I've had my tuning all over the board, currently my jetting is 48/190, 2 shims under the needle, stock slide and spring. My mixture screw is spot on, if I up the pilot jet, the screw says it's to rich. No vacuum leaks that I can detect. My plugs look like they should and it runs just about perfect otherwise. Any suggestions?

 

[tlingit]

I'm using Chevron gas. I moved up one grade above regular and mine runs fine with that same jetting. I do add Marvel Mystery oil (cap full on fill ups).

 

[Bugman]

All I use is 93 octane ethanol free gas. Brand doesn't seem to make any difference, and even when I have to use 91, it's not noticeably worse. My oil temp also runs pretty consistently at 200(dipstick thermometer, accuracy verified with boiling water).

 

[Guest]

Say...Aaaa

Does your Ignition system support a "VOES" ..??

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[Bugman]

Nope. It's a standard points setup. Timing is set to spec. Don't remember what it is off the top of my head, but it's whatever the service manual states.

 

[Speed King]

Speed ping?

 

[Bugman]

Speed ping?

It only pings at low speed, low RPM, using only about 1/4 throttle.

 

[merf]

Weak springs on the advance weights? or just geared to tall in first?

 

[rooster]

I have the same set up, no ping. Highest Oct. I can get.

 

[Guest]

Try retarding the timing some and go for a test ride...

There are three spring rates for the flyweights...

The first one is black in color and allow full advance to happen at about 1400 rpm's...This is what the stock springs are...

The second is silver and goes full at 2000 rpm's....They are also called "Heavy"

Third are Gold in color and goes full at 2600 rpm's Also called "Severe"

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If you had an electronic ign. that does allow the use of the VOES sure would make thing easy on dialing in the curve....The VOES come in diff. ratings and are a bit dialable.

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[BadMonkeyMW]

This. Your jetting sounds good, but the ping off the line is a timing issue.

Try retarding the timing some and go for a test ride...

There are three spring rates for the flyweights...

The first one is black in color and allow full advance to happen at about 1400 rpm's...This is what the stock springs are...

The second is silver and goes full at 2000 rpm's....They are also called "Heavy"

Third are Gold in color and goes full at 2600 rpm's Also called "Severe"

================================================

If you had an electronic ign. that does allow the use of the VOES sure would make thing easy on dialing in the curve....The VOES come in diff. ratings and are a bit dialable.

 

[chevelle]

+1, all timing on takeoff ping

 

[underrust]

I'd say replace the springs on timing weights. I would change mine every year when I rode a lot of highway miles and your advance may be wore out and sticking.

 

[Bugman]

Not having any springs on hand, I used some safety wire to effectively lock out the advance. Went for a ride, my ping seems to have gone away. Even though it's set to spec, the curve is wrong. I'll get some springs and get the curve dialed in. Thanks for the help.

Edit: Upon further inspection, my advance mechanism is worn out, the pins that the weights pivot on are pretty tapered, and it's all sloppy. I replaced this thing only 5,000 miles ago, don't remember the brand. Who makes a quality advance mechanism these days?

 

[Guest]

You may want to dig a little deeper....
For the unit to go bad in a fairly short time, could have excessive back-lash on the cam to pinion gear...

By having that going on will shake the shit out of the advance unit...
Don't matter who it is made by...It will become junk soon...

Best unit on the market is from Rivera.... (IMO)

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Lets say that you don't do the gear mesh check....
And the rattle cannot be heard cause for drag pipes are in the mix...
Could buy up a new advance unit every few thousand miles...OR...
Put in a ele. ign. that has no moving parts to get the "shit shakes"

And most of those have a few curves that can be dialed in for your motor needs, plus a VOES hook up....

That in its self would be nice if the bike is a heavy or big time on high compression...
It senses motor needs by vacuum and backs up the timing by about 10 degrees when needed automatically....

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Do I miss the days of the spark control from the Hand-grip...???? ..NOPE..

....We came a long ways....Tweety !!!....

...................Move over !!...................

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