My Bike has started to lose power at around 3000 rpm, this only happens when in gear and under load. As it reaches 3000rpm the revs very slowly build still. I have checked the pick up coil resistance and Ignition coil resistance all are ok. No fuel lines are trapped. Recently I have replaced fork springs/oil and had the front end off for access. The problem only started when I put the bike back together.
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the problem is not your tuning, it is your clutch. Motorcycle clutches are maintained as light as possible to stop heavy pressure on your fingers. often when you increase hp, you must increase your spring pressure on your clutch plates so the first thing is to adjust your clutch, if it is too tight it will slip under load (more load = more slip). second,clutches do wear out so if adjusting does not work you will have to inspect your clutch plates for wear and may even have to increase your spring pressure, this is a big job and you will need special gear to do it
If it continues to rev, it is probably not a carb problem.
I assume is has a wet clutch:ie the clutch runs in the engine oil.
Try an oil change, use a four stroke motorcycle engine oil,
Car oils have friction modifiers in them that can cause clutch slip.
and sometimes the expensive synthetic oils are just too slippery.
So try for a mineral oil, the bike shop will help you choose.
The latter part sounds like insufficient play on the clutch lever--the clutch seems to be slipping. Sudden power loss is usually linked to the ignition system. Have you checked the lube level in the transmission? You could be having a bearing seizure if the lube is low.
You have a fuel delivery problem.
Open the gas cap on the bike & try. This will prove if a vacuum is happening inside the tank (plugged vent).
Check fuel filter.
Check fuel pump.
Check fuel pressure regulator.
Clutch slippage would be a possibility. While rolling in 5th gear mid-range in the rpm band give the bike a lot of throttle. Do the rpms rise significantly without the speed of the bike increasing? If so you may need a new clutch or possibly just new springs. If you have put any oil additive it is possible your clutch friction plate(s) became contaminated.