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bluing pipes

  • Thread starter Thread starter terrylee
  • Start date Start date
T

terrylee

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Just sync. carbs and tried to set mixture screws by fastest idle, haven't been riding much, but pipes are turning blue and darker. So I must be running to rich? Didn't have this much bluing till I tried to set things right! terrylee:(
 
terrylee said:
Just sync. carbs and tried to set mixture screws by fastest idle, haven't been riding much, but pipes are turning blue and darker. So I must be running to rich? Didn't have this much bluing till I tried to set things right! terrylee:(
Click to expand...

Turning bluer and darker means LEAN dude!! Turning bluer means you've leaned it out more.
 
Thanks I was just reading some old threads and that's what I found out. Thanks for the info. guess I'll be turning the mix. screws out more. Righty lean, lefty rich, right? terrylee:o
 
Just went and turned them out to 3 turns, had been at 2 1/2. Hope to ride tomorrow and see what happens. Should you cover them with some caulk or something once you're sure they are set right, just to be sure of no air leakage? terrylee
 
terrylee said:
Righty lean, lefty rich, right? terrylee:o
Click to expand...
What bike you working on?

Have to ask, because different carbs have different adjustments.

If you are working on the skunk, the screws on the bottom are fuel screws. Turning them out (left) will richen the pilot mixture.

The screws on the side are air screws. Turn them out (left) will lean the pilot mixture.

Neither one of them should be anywhere near three turns out.

Also keep in mind that it's more likely that it's the MAIN jet that is leaning it out to turn the pipes blue. How much larger are they than stock?

.
 
So should I have the mixture screws out 3 turns or is this to much. I have the Mac 4-2 system with stock airbox and filter. I had a slight light bluing on the pipes before I sync. carbs. and tried to set mixture screws correctly. But now it's almost bluer than blue! So am I going to have to take carbs. apart and check main jet sizes? terrylee:(
 
Last edited:
Don't you have to re-jet sometimes when installing new exhaust systems and air pods?

A lot of people do exhaust and new filter setup, and have running problems, until re-jetting.
 
Plug check?

Plug check?

What do the plugs look like? I have an 78 GS550 with a MAC 4-1 exhuast and pod filters. Bike was super lean until re-jetting.

550 Stock settings:
Main 80
pilot 15

After mods
Main 100
pilot 17.5

I had to do a lot of adjustments with both fuel and air screws until I got nice brown plug results.

This may give you a ball park for your 850.
 
terrylee said:
Sorry, just my 80 850, so just one screw. terrylee
Click to expand...
OK
terrylee said:
So should I have the mixture screws out 3 turns or is this to much. ... So am I going to have to take carbs. apart and check main jet sizes? terrylee:(
Click to expand...
As I mentioned, the mixture screws will affect the PILOT circuit ONLY.
That will be fine if you just sit there idling or maybe run it up (gently) to about 1500 rpm in each gear.

If you ever plan on running that bike the way a motorcycle should be run, yes, you will have to change the main jets.
Might have to shim the needles, too.


1_v8_merc said:
Don't you have to re-jet sometimes when installing new exhaust systems and air pods?
Click to expand...
Not just "sometimes", but virtually EVERY TIME.

.
 
Ok, but I have stock airbox and filters. And since I didn't have this problem till after sync. and screw adj. I just thought that might have caused the problem. I've had the Mac system for two years. Guess I shouldn't ride much till I get this fiqured out? terrylee
 
Didn't '80 have CV carbs? If so, I'm unfamiliar with them. All I know is if after adjusting the pipes turn bluer, you better reverse your adjustments quick.
And the mains...aren't they for wide open throttle?
 
Rick65Cat said:
Didn't '80 have CV carbs? If so, I'm unfamiliar with them. All I know is if after adjusting the pipes turn bluer, you better reverse your adjustments quick.
And the mains...aren't they for wide open throttle?
Click to expand...
Yes, the '80 had CV carbs.

Mains will be in partial use above 1/4 throttle, more so at 1/2 throttle, then will be the primary fuel source above that.

.
 
80 850 w/ cv carbs.

80 850 w/ cv carbs.

Ok, tried to clean the blue off my pipes and readjust things till I can get larger main jets. So I turned air mix screws out to try to richen (that is right? out is richer, in is leaner or righty-leaner, lefty-richer) Don't have time to resync. today but will try to do in next couple of days. Also I know I have seen mention on here about holes in bottom of airbox and this not being a good thing. So I do have three small holes on left and right side of bottom of box. So I covered them with duct tape for now to see if this would help with the lean condition, should I have done that, or are these holes needed? I did seem to get rid of alot of the backfiring when let off throttle. I planning on taken it for a short ride later and see if anything is better. It looks as through #115 is oem for main jets, so should I go up to #120? I have the 4-2 Mac, but stock airbox and filter. terrylee
 
still looking for some answers please

still looking for some answers please

Just thought I try to repost my questions about my 81 850. Thanks so much! terrylee
 
Airholes in the airbox are needed to let the air in to the filter. I'm not familiar with the 850 so I'm not sure how big or how many holes there should be.
If anyone has an unmolested 850 airbox they could take a picture of?
 
Single wall header pipes will turn blue no matter what you do. Running the bike in your driveway where there is no airflow over the pipes will accelerate the bluing process.

I'd get those bigger main jets, leave the mixture adjustment at 3 turns, but adjust per the highest idle setting, and then see how the bike runs. If the plugs look good and the bike runs well, forget about the bluing.
 
The holes in the bottom of the airbox look stock.
they are about 3/8-1/2 inch and three on each side. I did cover them and bike seems to be running ok. I've got the screws at 2 1/2 to three. So far only first cylinder is only one with any bluing coming back (got alot of it off) and even that is not much bluing except right on the end next to manifold. So since I have stock airbox and filter do I only need to go up one size on main or should I do two? Thanks so much! terrylee
 
Still wondering about weather to go up one or two main jet size? Rode bike to work today for first time since all this bluing problem and did leave holes covered on airbox, and I swear the bike ran better! But still want to change jets. terrylee
 
Still wondering what size main jets to use in my 850. With stock airbox and filter and Mac 4-2? terrylee
 
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