Bucking issue under load?

[Gary Lewis]

That makes sense.  How about just swapping the "original" carb back?

[AmericanSavage]

Hey Dave,

This is what I was thinking—it is one of the few I found on this issue.  I do not think there would be evidence of oil burning from the tailpipe—the amount is so small that leaks, it is burnt ash and therefore, can go undetectable without pulling the plugs.

https://bikerestart.com/ash-deposits-on-spark-plugs-causes-color-solution/

I also read something somewhere, that the “new” coolant does not build up as much to leave a deposit if there is a leak into the chamber.  I am not sure that is the final word tho.

Keep us up to date!  I am leaning toward a small leak past the guide.  

[FuzzFace2]

Gary Lewis wrote

That makes sense.  How about just swapping the "original" carb back?

I might do that but I can still feel a miss it just is not bucking like it was before.
I can also feel it when the AFR is in the 13's when first taking off from a stop like a little old lady.

I think I got to fix the miss first as that has to be throwing off the AFR then deal with the carb.

I forgot I got a box of Carter YFA carbs & parts so I might be able to get the needle & jet from that supply and pop it into my old carb as I know there was something missing on the needle assy. but the carb ran good so never worried about it.

If I get out some what early tomorrow I will stop in Raleigh to pick up the pick up coil as that was the only place that had it in stock.

I also made a small screw driver that fits the hole of this new carb but I cant tell if I am hitting the screw and turning it so I try, ride, try, ride and repeat as it has not changed much so I am done for today.
Dave ----

[FuzzFace2]

AmericanSavage wrote

Hey Dave,

This is what I was thinking—it is one of the few I found on this issue.  I do not think there would be evidence of oil burning from the tailpipe—the amount is so small that leaks, it is burnt ash and therefore, can go undetectable without pulling the plugs.

https://bikerestart.com/ash-deposits-on-spark-plugs-causes-color-solution/

I also read something somewhere, that the “new” coolant does not build up as much to leave a deposit if there is a leak into the chamber.  I am not sure that is the final word tho.

Keep us up to date!  I am leaning toward a small leak past the guide.

I guess it could be a small oil leak in to the hole and being burnt?
That is why I also swapped plug wires because if that one was weak it may not fire strong enough to burn it off. So I will keep an eye on them 2 plugs and see.

As for coolant IIRC it was the 50/50 mix I picked up at HF as it was cheap so cant say if it the "new" type or not LOL

Right now I want to fix the miss it has after the plug change as that will change the AFR.
Then I will deal with the lean carb or may see about fixing the old one, I found a box of carbs & parts, and put that back on?
I will keep this up to date till it is fixed.
Dave ----

[FuzzFace2]

Lets start with the coil, I have changed out the high tension coil the other day with no change.
Cant remember if I did that before or after the plugs? but it is "new" And we all know about new parts but I cant see it a cause at this point in time.

BTW I was told to check the voltage to the coil  IIRC it was
+ = 8.75 - 9.5 maybe a little higher
​​​​​​​- = 6.75 - 8.25

The other and only coil I have not done anything with other than buy a replacement is the pickup coil inside the dist.
The new one, a Standard Products one, is sitting on the seat of the truck.

So I did ALL plug wires. I used a little dielectric grease on the plug end of the wires so hope they come off easier when I have to remove them. 
The plug wires may have helped a little as I can still feel a little miss at times.
I think before I swap out the pickup coil I will try and get the AFR up to a safe area as it is in the 16 to 17 range and that can cause a lean miss and that now can be what I am feeling?

Thing is to adjust this they only give you a 1/8" hole to put the regulator screw driver thru and then you got to feel to get it on the screw.
I may wind up removing the top of the carb a few times to get this adjusted we will see.
Dave ----

[FuzzFace2]

Well I fatten up the carb from high 15's to low 17's to high 14's to low 15's just where I think it should be.
I can still feel a miss thru out the truck but at this point I am going to hold off on the pick up coil till I get a good run in like to the next town over on the high way and then back roads home, and see how it dose.

I still need to put the adjustment plug back in the carb so it will not leak out gas and install the air filter assy.
But it should be good to pull the trailer for the food Hall get together at the end of the month.
Dave ----

[FuzzFace2]

I got to thinking if doing plugs & wires, I broke one wire and other felt because of age 8 years but only really used 4, that is also best to pick up a cap & rotor even that the old ones looked good.
This way I know from coil, yes coil too, to the plugs are all new for a "tune up".

Tomorrow I will change the cap / rotor and see if that changes the miss.

My son did the air filter, gas filter and breather not long ago even changed the oil & filter too.
Dave ----

[Gary Lewis]

I agree.  Good luck!  

[FuzzFace2]

I have not given up on this.
When I was doing the other work I was taking care of my wife who week ago Mon went for a medical procedure for Afib then got Covid Wed. between the 2 that really knocked her out.

Well Fri before bed I was not feeling good so Sat. morning I was at Urgent Care. Tested neg. for Covid but could be to early, it was as I tested pos. with a home test and it knocked me out.

I do have the cap / rotor and pickup coil for the dist. just need to feel a little better before I swap each one out and fingers crossed no more little miss under light load.
Dave ----

[Gary Lewis]

I was feeling bad on Friday a couple of weeks ago but tested negative.  On Sunday I tested again and within 2 minutes I had a bright red line saying "Dude, you have COVID!"  So yes, you can easily test too early.

I got Paxlovid and it was a miracle drug.  Worked very quickly but leaves a horrible taste in my mouth.  Glad to be through with it yesterday!

Hang in there and get well!

[FuzzFace2]

Gary Lewis wrote

I was feeling bad on Friday a couple of weeks ago but tested negative.  On Sunday I tested again and within 2 minutes I had a bright red line saying "Dude, you have COVID!"  So yes, you can easily test too early.

I got Paxlovid and it was a miracle drug.  Worked very quickly but leaves a horrible taste in my mouth.  Glad to be through with it yesterday!

Hang in there and get well!

Good to hear the Paxlovid worked for you.
The wife told me to ask about Paxlovid and being we always listen to ours wives I did.
The Dr said I cant take it because of the 2 meds I am on for the rest of my life, so no need to ask again.
The wife could not take it this time because of the meds she is on from the procedure.
Dave ----

[FuzzFace2]

Do you think the #4 plug fouling could be from the PCV?
It goes to a vacuum tree in the intake under and to the rear of the carb across from #4.
You can see the tree here

I had a milk shake issue when first on the road but dont now.
I dont remember doing anything to fix that other than make sure the PCV had vacuum to it.

Yes it has a 195* stat and when I drive it it is 80 miles round trip to work & back and when 90*+ out should get up to temp to boil out any water.

So you think the PCV was the cause?
Dave ----

[FuzzFace2]

I changed the cap & rotor this morning. Again they did not look bad and even in sun light I only saw a little color of what looked like dry oil on the #4 plug tower.
It was hard and did not wipe off but other wise looked good.

Let the truck warm up good before making a trash run of maybe 10 miles.
I can not tell if the miss is still there or I am just thinking I feel it?

I am going to hold off on the pick up coil and put some miles on it then pull the plugs to see what they look like.
I have a Dr apt tomorrow, 10 miles each way?
Car show Saturday maybe 30 miles each way?
Plan on using the truck to / from work for the week just under 400 miles.
Dont think I have a show for that Saturday but have a cruise in that I need to pull the club trailer to 40 miles round trip.

That should be enough miles on the plugs and pulling the trailer that really started this bucking to show if something is not good.
​​​​​​​Thanks for every one's help
Dave ----

[Gary Lewis]

Glad things seem to be getting sorted out. But how are you and your wife feeling?

[FuzzFace2]

Thanks for asking
The both of us still have a cough, me more than her, but we both have gotten outof the house to day.
Me had to get my monthly eye injection and her a little food shopping.
If you see the time this is posted I could not sleep because of the cough

Put about 40 miles on the truck going to the eye doctor twice.
Forgot my wallet and they would not take me with out money.
Been going for 8 years now and always pay copay & balance but would not let me skip this time and I had no balance!

Truck ran great. Going the first time did 70 to 75 MPH just so I would not get run over, limit is 70.
Also some stop & go thrown in.
I have a car show today about 20 miles each way but will be at a slower pace as the others dont drive on the high way, no over drive like I have
Dave ----

[Gary Lewis]

Even having had the Paxlovid I still have a cough from time to time.  But nothing that gets me up a 1:51 AM!  Yikes!  I hope that goes away pretty quickly.

But I will say that after the 1st round of COVID a year ago my chest was never quite the same.  With weather changes or much exertion it got tight.  Now, having had it a 2nd time, it is even tighter.  Hope you don't have that.

Glad the truck is running so well!  What do you think the problem was?  Or was it a combination of a lot of things?  Obviously the one plug was fouled, but even swapping it out didn't completely solve the problem - right?

When do you pull the trailer again?

[FuzzFace2]

This is the 2nd go round for the wife and I and I think this time it hit us a little harder.
Both of us went back to urgent care this morning because of our cough and keeping us up.
We are now both on different drugs then before that knock us out so we can sleep / rest as that is how you get better. It is my head and chest I feel pressure on this time. First time my smell got more refined I guess you would call it.

Between the knock out and 1 having Codeine in it I cant work as I drive a big rig. Work will be happy when I call out again tomorrow as I been out 2 weeks now.

On the truck I still feel this little miss every now and then at different times. I even used it to go to urgent care as I want to put miles on it testing.
Yes the plugs were a big help but at this time everything but the pickup coil has been changed / replaced so I am thinking the pickup has to be the issue now.
Depending how I feel in a day or 2 I may just swap it out as the last thing to do.
I pull the trailer on the 29th so if I dont swap the coil that would be the test.
Dave ----

[Gary Lewis]

It is a bummer that you can't take Paxlovid.  It really really worked magic for me.

Hope you get over this quickly, but I still have a bit of a cough a week after getting "well", and my chest is still tight at times.

On the truck, hopefully the pickup will be the last problem.

[FuzzFace2]

Being I am recovering from Covid I pulled the log book from the truck.
I keep it to track MPG mostly, and I had a stack of papers to enter so I did that today.

I had 4 enters total, 2 in the 17's they I thought was pretty good just wish I knew how I did it?
1 at mid 16's and the last at mid 15's.
Most of the time i was in the 15 to 16 range and the last was when I had issues pulling the trailer even if not far so did not shock me much.

I then went to the first entry 10 - 20 - 2019 "first road test after rebuild" at 37,439.3
Then to the last fill up 10 - 12 - 2023 and 65,511.5
That was 4 years and 28,072.2 miles ago.

So was off a little on the miles of 10K to 15K in 4 years time
Guess she did need a tune up and I should do oil and grease too.
Dave ----

[FuzzFace2]

I could not wait till the "real test" tomorrow. I used the truck last 2 days to / from work about 120 miles.
I could feel the miss more when the motor was cold and seen it run lean so I wanted to swap the pickup coil in the dist.

Well did not go good. It was a easy swap but the out come was really really bad.
As soon as you gave it throttle the motor bucked even worst than when pulling the trailer.
I have seen it posted others having problems when they replaced the coil so I think I am one of them now.

I also pulled all the plugs, #4 looked rich? #1 & #6 looked lean the rest looked good.
I tried to take a compression test the only gauge was a push in and the rubber was rock hard  time to hit HF for new compression tester.
I got 90 psi with it not sealing so as a guess 120 or so but I call the compression good.
I swapped the 2 rich plugs for #1 & #6. lean plugs.

When swapping pickup's I seen the old unit had a gap between the coil and reluctor, and the plate the coil was on did not have the plastic pads so it flopped all over.
The new unit when installed the coil and reluctor were way to close (touching?) at the top and gap at bottom but the plate had the pads.
I think the 2 parts hitting is why it ran like crap and bucked.

My fix was to use the new plate with pads and the old coil. It came out with a nice gap and the plate did not flop around.
When I got the dist. installed, I marked everything so I did not have to use the a timing light.
It cranked over like the timing was way to advanced? I backed it off a bunch and it started but ran like crap but also way better than the bucking with the new coil as you could raise the RPM.

Timing light showed it was at 40* BTDC!!!! but no kick back on start up now but had a miss at idle and lean on the AFR.
I adjusted the timing to 15* BTDC and the idle miss went away and the AFR went to the rich side and I was ok with both.

I also checked the dist. advance, RPM it cam up with RPM but it was pretty high. Think that is what I worked it out with vacuum advance to stop pining.
Next was the vacuum advance and that was NG! No wonder why I was not getting any pinging with the new carb.
Port did not have vacuum when the RPM went up, nice china carb NOT!
I may rework the factory carb and put it back on stay tune on the carb.

The road test with out trailer went really good. I did not feel any miss on the run but will see with the trailer to
Dave ----
edit: I also checked for vacuum leaks, none found