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Not sure about the specifics of your bike fuelling system. Does it have auto choke, is the fuel tap controlled by vacuum from the carbs?
I usually go through it in this order :-
check timing, set valve clearances.
check carb vacuum levels are even.
check and adjust fuel air mixture.You have to adjust things at operating temperature. The symptoms you are describing sound a bit like the choke still being on once the engine is warmed up so it maybe fuel mixture.
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Float bowls sticking is another possibility. I have some translucent bowls for the BMW to help diagnose those sort of problems.
I would definitely get a vacuum gauge on the carbs, gives you so much information and you can't balance the carbs without one.
Airhead
@Josh
I've been having real problems with my 81 gs550l recently.
It cut out once or twice the last time I rode it and it started to bog down (no power) when revving in the low end.
So we stripped the carbs off, gave them a clean and rebuild. Sorted a new air filter, cleaned the fuel lines etc.
When we put them back on the bike didn't start and had poor sparks in a few plugs. Turns out one lead attaching to a coil pack had broke...so we've replaced both coil packs, spark plug heads and spark plugs and now it fires up first time which is beautiful and very promising!
Went to take it around the block for the first time in months after having thought we have sorted the issues with the above remedies, one little lap and it was running fine, revved nice in the lower end (unlike it used too) and it felt good.
And then all of a sudden it started to splutter, not rev, bangs out the exhaust and just wouldn't rev up at all and sounded horrible....so back to square one..
If anyone here has an idea of what's going on that would be great...please note the work already done to the bike. I'm trying to upload a video of the sound it now makes when you rev it...
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