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Re: loss of power
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.
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check your compresion make sure it is within specs. if okey check your timing make sure timing mark have not change. this is after you ensure that your not loosing fuel or your carb is working normally.
Had same problem with my sons 2000 1100. Was told by mechanic that the High RPM Jet was clogged and to clean carb. I filled the tank, put 1/3 of a can of Seafoam carb/injector cleaner, by the end of the week it was running 100 mph again.
Sounds like the carb is frozen or the ignition timing is way out (check distributor and loosen the clamp, turn it slightly with the engine running until it idles and revs up nice) . Reset the ignition timing, if that does not cure it, a carb rebuild is on the cards.
Do an oil change. If the gear were stripped there will be lots of metal particles in the oil. More than likely the fork is slightly bent such that the slider for fifth gear is just barely engaging. Put pressure on it by increased throttle and it pops out.
Go to the site below where you can see a parts diagram for your specific bike. You will select the actual brand, year, model, etc., once you go to the site. Part numbers and prices are also shown. You can order parts from this site. In the event no price is shown on a particular part, the part is not in stock. www.babbittsonline.com/pages/parts/viewbybrandand/parts.aspx
Only three things would cause the problem. 1) a slightly beny shift fork, 2) a shift index wheel loose, 3) the foot shift lever needs to be adjusted.
The most likely source is the shift lever needing to be lower. Once you are in 5th gear you move your foot to the top iof the pedal in preparation for a downshift. At high speed your entire body is leaning forward FOOT INCLUDED. Chances are that enough pressure is on the pedal to move the slider gear out of position and thus out of 5th gear.
I doubt that any gears are stripped. Believe me you would have known it when it happened at 40mph which is where you would have to be in 5th gear. This is a bent shift fork. The actual gear is fine. The slider gear is not moving far enough to engage with 5th gear. The YZ does tend to have this problem in 5th and 1st. "Dirt rider Magazine " did a story on it. Best to let the shop do the repair as the entire motor gets torn down into about 100 parts.