Snowbum has a page on intake/exhaust tuning...this might give you some ideas:
You may want to do what's called a "plug chop". This is done...safely...by running along in top gear at say 60-70 mph and close the throttle and kill the engine while safely coasting to a stop. When it's easy to do, pull each plug out and look at them...if they are very whitish then it's running lean; if they're blackish then running rich. This is all contingent on on what unleaded fuel now does to plugs. In the old days, with all the additives, plug color was a big deal. It might be changed somewhat with the latest fuels.
'78 R100/7 '69 R69S '52 R25/2
To be safe do the plug chop as Kurt says. Run the bike at speed (65-70 is good) for at least 5 minutes before shutting down to check the plugs.
69 R60/2 76 R90S 78 R100RS
70 Triumph w/Spirit Eagle Sidecar