I just got my 1989 R100T back from Quality Cycle Service in Tonto Basin, AZ, ( http://qualitycycleservice.com ).

I had Dave install:
* New MAC deep oil pan, ( https://shop.macperformance.com/MAC-BMW-Twins-1970-1989-Large-Oil-Sump-Pan-98101.htm ) No modification to the center stand needed.
* New Sebeinrock replacement kit. New cylinders and pistons , https://www.siebenrock.com/en/engine-parts/replacement-kit/3018/replacement-kit-1000cc-99mm?c=618
* Cylinder heads rebuilt by Ted Porter's BeemerShop.
* New timing cover, .

Since I bought the bike off e-Bay, I asked him to check everything out. And get it running correctly and up to speed.

Anyway, I got my bike back and the bottom exhaust manifold pipe is all blue. I asked him about it and he said I need to change a jet in the carburetor/s.

I was exhausted driving down from Las Vegas and didn't put two & two together and ask him why didn't he adjust the carburetors? After all that's what I was paying $1600 for.

So now I'm stuck with figuring out what needs to be done to get my carbs running right.

* My first question is, how can I tell if the lean problem is occurring at idle, or at speed?
* I understand the fuel/air mixture screw on the bottom of the carbs is for adjusting the mixture at idle. And only effects the idle mixture.
* I also understand the internal jets are for adjusting the fuel mixture at speed.
* So, what's the easy way to tell which one is my lean problem, causing the blueing? Idle or at speed?

My bike seems to run so-so, but that I assume is to be until the new parts, valves and pistons break in. Dave said around 350 miles.

Any help, ideas, would be greatly appricated.