Hello all. I am looking for advice on my 1975 R90/6.
First some history. Over a decade ago a friend had this bike. He decided to do a major overhaul. He sent the engine to Bob's BMW where it was dual plugged. He lso had 9.5 pistons with ligt wrist pins installed. He put in a 336 cam, ss 40 mm exhasut valves, 42 mm intake valves and had the heads ported. The flywheel was lightened and everything was balanced.
Unfortunately before the bike was up and running he was killed in an accident. Now I have the bike and I have it back together. I added a dyna ignition rebuilt the carbs and have it running. The carbs are stock 32 mm Bings.
My question: The bike idles fine but under power feels sluggish. Can anyone suggest changes to the carbs that would help performance? I am wondering about jetting, needle settings.
Thanks in advane for your suggestions.
John
First some history. Over a decade ago a friend had this bike. He decided to do a major overhaul. He sent the engine to Bob's BMW where it was dual plugged. He lso had 9.5 pistons with ligt wrist pins installed. He put in a 336 cam, ss 40 mm exhasut valves, 42 mm intake valves and had the heads ported. The flywheel was lightened and everything was balanced.
Unfortunately before the bike was up and running he was killed in an accident. Now I have the bike and I have it back together. I added a dyna ignition rebuilt the carbs and have it running. The carbs are stock 32 mm Bings.
My question: The bike idles fine but under power feels sluggish. Can anyone suggest changes to the carbs that would help performance? I am wondering about jetting, needle settings.
Thanks in advane for your suggestions.
John