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Exhaust not blueing.

  • Thread starter Thread starter billygs
  • Start date Start date
B

billygs

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Hi could anyone help me.
I have recently had my engine top end overhauld,valves and shims all done.
after runnjng the bike since i have noticed that here is no exhaust blueing on cylinder 1. I have just had my carbs balanced and it runs sweet as a nut, but still no blueing on cylinder 1 exhaust. Is this because cylinder 1 is not getting as hot as 2,3, and 4. could anyone tell me if i have a big problem please.

Cheers Billygs.
 
That would probably indicate #1 is richer than the rest. If you have stock exhaust, you don't really want to see much color change. If you have an aftermarket exhaust I've read a gold hue is OK, but blue is usually thought to indicate a lean condition. Rather than #1 being off, I'd say #2, #3, and #4 are off (lean).

It may be as simple as adjusting your float levels or tweaking your mixture screws. Of course if you have pods and/or non-stock jetting it's a whole 'nother story. You also may have intake o-ring (if you have them) or intake boot leaks.

But check the color of your plugs for starters. This will help to corroborate the lean/rich status of the cylinders.
 
t3rmin said:
That would probably indicate #1 is richer than the rest. If you have stock exhaust, you don't really want to see much color change. If you have an aftermarket exhaust I've read a gold hue is OK, but blue is usually thought to indicate a lean condition. Rather than #1 being off, I'd say #2, #3, and #4 are off (lean).

It may be as simple as adjusting your float levels or tweaking your mixture screws. Of course if you have pods and/or non-stock jetting it's a whole 'nother story. You also may have intake o-ring (if you have them) or intake boot leaks.

But check the color of your plugs for starters. This will help to corroborate the lean/rich status of the cylinders.
Click to expand...

Hi t3rmin.

I have a motad 4 into 1 exhaust, if my carbs are running lean on 2,3, and 4 is it awkward to set the mixture screw correct i.e to match cylinder 1.

Cheers Billygs.
 
The plugs will tell the tale.

Did you retourque the head down after 500 miles? Recheck valve clearance? The valves and top end will settle in a bit during break-in.

So you're running with the airbox?
 
Blue...unless right at the head...is too hot IMHO. When the head was off were there o-rings to contend with (intake) or 16-V no rings?
 
Dave8338 said:
Blue...unless right at the head...is too hot IMHO. When the head was off were there o-rings to contend with (intake) or 16-V no rings?
Click to expand...

Hi dave.
A mate of mine done the overhaul for me[he,s te head mechanic at a local harley dealer],so i don't know about any o-rings. HELP.......Will it being to hot damage me engine.

Cheers Billygs.
 
billygs said:
Hi dave.
A mate of mine done the overhaul for me[he,s te head mechanic at a local harley dealer],so i don't know about any o-rings. HELP.......Will it being to hot damage me engine.

Cheers Billygs.
Click to expand...

8v = Round Cam Ends
16v = Rectangular

And yes, too hot is just that...too hot.
 
UncleMike said:
8v = Round Cam Ends
16v = Rectangular

And yes, too hot is just that...too hot.
Click to expand...

Hey mike...long time, no tech! :-D BillyGS, Take a look at the plugs as was mentioned and they'll tell you if things are too lean. Compare the one from #1 (should look light brown in color) to the other three. If #2-4 are white or near white, things are too lean. Yes... if it is too lean and run hot for to long, several things can go south, pistons, rings, valves, just to name a few.
 
billygs said:
Are the o-rigs you mean on the carb intakes.

Cheers Billygs.
Click to expand...

If you have an 8v engine, they would be between the head and the carb boots.

Thanks Dave. Haven't been around the site much lately. It's been a busy spring/summer.
 
Dave8338 said:
Hey mike...long time, no tech! :-D BillyGS, Take a look at the plugs as was mentioned and they'll tell you if things are too lean. Compare the one from #1 (should look light brown in color) to the other three. If #2-4 are white or near white, things are too lean. Yes... if it is too lean and run hot for to long, several things can go south, pistons, rings, valves, just to name a few.
Click to expand...

billygs said:
Are the o-rigs you mean on the carb intakes.

Cheers Billygs.
Click to expand...
Yes.. o-rings on the connection from the intake tubes to the cylinder head. (If you have the 8-valve engine "round cam caps/ covers").
 
billygs said:
Hi t3rmin.

I have a motad 4 into 1 exhaust, if my carbs are running lean on 2,3, and 4 is it awkward to set the mixture screw correct i.e to match cylinder 1.

Cheers Billygs.
Click to expand...

Well I think you can expect that exhaust to discolor somewhat. (From what I understand stock exhaust is multi-layered and/or thicker and shouldn't blue/gold under normal operating parameters.) But definitive blueing is a Bad Thing (tm).

If the plugs verify lean on 2-4, replace all four intake boots/o-rings and make darn sure there are NO leaks in airbox, petcock vacuum, etc. If you're still lean and jets/needles are the same in all the carbs, raise the fuel level (lower the floats) on 2-4 and/or twiddle with the mixture screws.
 
Oh yeah, and I know you said your carbs had been synced, but if the sync was done poorly and #1 throttle plate was more closed at idle than 2-4, and the bike was run at idle or near-idle a lot, you could also see this symptom as there'd be significant temp difference.

Was the 4-1 pipe installed all along, or was that done during all this work recently?
 
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