Hey I have a wonderfully restored 85' XR600 with the pesky two carb. config. The bike ran great up untill I was riding around 50-60mph on an old railroad bed, (was a little whoopy hard to keep the bike on the gound) and every time I hit a whoop, the bike would quit for a sec and then come out of it. It was realy annoying. Then My buddy caught up to me and we stoped for about 5 minutes. It restarted fine and then I went to take off again. No power and it skipped and sputtered. I have fine comp. and the comp. release was off. No smoke 'cept the usual small amount of blue from an older engine. It idles great starts great but it doesn't like getting on the throttle. Wazupwitthat?