wiredgeorge wrote:
What altitude is the bike operated? What is the current jetting? Have the bike's intake or exhaust been modified. Just a litttttle bit of information is helpful...
The problem COULD be related to one of these issues or the bike could be starving for fuel. That is, the petcock obstructed, the fuel lines clogged or perhaps the carbs themselves are clogged with goo/sediment, etc. The other possible problem source is that one or both slide diaphragms are holed/torn/ripped. If this is the case, engine vacuum can't lift the slide sufficiently and you will not meter sufficient gas towards higher rpms while at lower, your bike will run adequately.
If you want to fix this problem:
1. provide info requested
2. take steps to remove potential fuel obstructions
3. check slide diaphragms for damage
well, on my bike, the petcock is clean, new fuel line, and the carbs have been cleaned.....still pretty slow.....and as for the torn diaphram, in neutral it revs up just fine, not slow at all....