Carbs all 4 most open at the same time...can reach upper rev cant reach upper rev.....7000 rpm up @
SOURCE: runs rough, backfires out exhaust
It sounds like you have several problems.
1 you may need piston rings, check compression
2 you have a timing issue. set timing on # 1 or # 4 cylinder to TDC check timing mark on ATU. use timing light to check if timing is advanced or retared.
3. coil wires maybe out of order.
SOURCE: My Zeph an imported bike will not rev above 7000
If the bike came from the UK then most likely the power was limited, its usually just a throttle stop, look down where the cables hook up.
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