SHOW ME YOUR SPARK-PLUGS

[francoblay1]

Sounds to me like you know what you're doing. I don't have experience beyond my own scoots, so the cheat sheets help. Gas Man's post, that I reposted, seems to be more applicable to dyno tuning.

Appreciate your input.:2thumbs:

Its been posted many times.... here you have it again.

Attached;
:up:

 

[Sven]

 

[Brew]

Those look HAPPY HAPPY HAPPY to me...

 

[Mr. Wright]

I have some miles on these. I don't rightly remember when I changed them last.

 

[badyellowvette]

Took mine out last summer to have a look. Don't know what jets I am running, last owner said they were changed, I haven't looked yet. Thought plugs looked fine though.

 

[BBChopper]

Your rich at idle and mid circuit.
Go down to the 31 and then test it with the 76.
You may have to go back up to the 78 but your not at risk going to 76.

:2thumbs:

 

[francoblay1]

Brand new…. 25 miles on them… 32 Inter – 76 Main (60 Airbleed) – Carb re-adjusted as per usual S&S instructions.

No sneezing, no decel popping, goes very strong…

Maybe not enough miles yet to get a reading? (as I said, brand new plugs).

What’s your opinion?

:Cheers:

 

[Mr. Wright]

Shite! sorry... I just realized that if I delete them from Photo-bucket they disappear from her too.... grrrrrrr

And if your drinking to much, you end up with oil rigs instead?

 

[francoblay1]

And if your drinking to much, you end up with oil rigs instead?

Oh crap.... an honest mistake, I just have opened a bottle of wine... my first drink today! :up:

Going to delete that one, it is from Equatorial Guinea.

 

[francoblay1]

Took mine out last summer to have a look. Don't know what jets I am running, last owner said they were changed, I haven't looked yet. Thought plugs looked fine though.

These lK Good to me :2thumbs:

 

[cdogg556]

The one on the right looks a little lean, maybe just the pic, not too bad though!

 

[Mr. Wright]

I have some miles on these. I don't rightly remember when I changed them last.

No one ever read my fortune on my plugs.

 

[francoblay1]

No one ever read my fortune on my plugs.

Kaptin?????? Sven?????? Where are you?????

 

[francoblay1]

Well.... I ended up with a 31 & 76 jets.

Will take pictures of the plugs when have done a few more miles..... I F´ed up my wrist so no riding for a few days.... :bang:

 

[francoblay1]

Wow! Curtis, how can you tell all that from a photo?

If anybody needs more info on plugs, etc. try the following:

Spark Plugs

Motorcycle Repair Course

Reading and Selecting Spark Plugs

Chris - aka Gas Man also has some guidance:


How to adjust your carb and check jetting

This is a hot topic... posting the thread may help... here's a improved version of what we have told COUNTLESS people.

To adjust the carb...

Some educational reading by S&S

S&S carb adjustments
S&S Shorty Carburetor Adjustments

S&S Carb Manual
S&S Cycle ::

For my 2 cents...

with the bike warm...
(in=clockwise/out=counter)

if your idle is low... turn it up a bit...

now spin in the accel pump screw till it seats.

now spin in your fuel/air mix screw till the motor sounds like it wants to die

now spin it back out counting 1/4 turns. Do it slowly to give the motor/carb time to adjust. Do this till the motor sound like it wants to die on this end. Now you have counted those turns and you have say 2.5 turns. Spin it back in 1.25 turns. Or middle to almost dead on each end.

Now adjust your idle to 1,000 rpms on the tach.

Now spin the accell pump screw out 1.5 turns

Now with a few quick stabs at the throttle see if the rpms come up fast like you would think or if it kinda hesitates then takes off. If it does hesitate then spin the accel pump out another 1/4 turn and repeat till you get what sounds good.

If that don't fix the sneeze... you can spin out the accel pump a bit more... but anything over 2.5 turns MAY mean you need a larger intermiediate jet. This is a common debate.

Then re-adjust your idle to about 1,000 RPMs. Too low and it may die. Too high and it will clunk into first gear.


Now on the plugs... to test run the bike and see if the jets are good. This can also be done before you ever screw with your jets.

Check or replace plugs.

run the bike but keep the RPMS below 2500... then don't let it idle and kill the motor, check the plugs. That is to help check the int jet.

Then take it out and run it hard... keep the RPMs up and romp on it... then on a striaght patch of road with the RPMs up high (over 3k, or even higher) kill the motor with the OFF switch. Pull the plugs and check. that is to test the main jet.

The idea here is that your int jet runs from idle to about 2750. Then the main kicks in from there out. That's why we say your run mainly on your int jet. main is only for romps.

Use this GUIDE to read your spark plugs. The basic idea is white is lean, black is rich. What you are aiming for is a nice cinnamon color to the grounding tip.

To talk jetting...

One of the most common problems is...if you are expierencing a cough at highway speed 75mph +/- RPMs at about 2750... cough thru the carb... go up on int. jet.

Of coarse once you change the jets you will need to re-adjust the carb again.

Very good links there Griz, awesome reading in #2 :2thumbs:

 

[francoblay1]

http://www.bigdogbiker.com/forums/ignition-electronics-batteries/71425-sparkplug-visual-check.html

 

[BWG56]

Nice chart, Franco:2thumbs: Mine look like #8:roll:

WTF, now I see it wasn't your chart, Wanker:lol:

 

[pigpuppy]

Don't mean to horn in but....

I know this has been talked about at length but I'm still having some problems with backfiring on deceleration. This is what I've got.
My bike is a '07 Mastiff, 585 cam, thunder heart ignition, Vance and Hines 2 into 2, XXX carb. mods. I am in East Tn. elevation problem around 2000ft.
The bike runs and pulls great other than the backfiring. I road today and turned the idle mixture screw out about half more turn and the backfiring all but quit, but it's not adjusted to specs doing this. This to me says lean condition, I was thinking about going to a 38 on the intermediate or should I go up on main? What is your thoughts on this plan.
Thanks


Intermediate= 36
Main= 78
Air Bleed= 50

 

[francoblay1]

pigpuppy,

36/78 cannot be lean at your altitude... it would not be lean @sea level neither.... I am at sea level also running a 585, V&H 2-2, TH ignition, etc and I run 31/76 & 60 airbleed.

You could have an intake/exhaust leak? someone else will give better advice on that backfiring matter but all I know is that some have never been able to get rid of it, mine still does it a bit.

For the time being, check THIS out :up:

... and this http://www.bigdogbiker.com/forums/fuel-air/14439-what-jets-do-you-run.html

 

[Mr. Wright]

I agree with Franco. Replace your intake o-rings, it cured my popping, and idle problems.