Define "a lot of throttle." Are you trying to release the clutch like you would on a 1000, where you just ease into the throttle right off of idle?

 

I would bring the RPM to 4000 and slowly release the clutch and by doing so the rpm would go lower then idle.

 

Is it hard to push? Brakes dragging?
Does the bike sound like it's firing on all four cylinders?
How tight is the chain?

 

Easy to Push, breaks work great and dont drag, dont know the sound difference between 3 cylinders and 4 cylinders and chain is in mint condition.
Note: he did mention a problem with 1 cylinder but he had it fixed and have the paper work for it.

 

Lift the tank and prop it up, now disconnect #1 coil electrical connector and start the bike , then put it back on and pull #2 and start....and so on.
If any disconnected cylinder doesn't make a difference in its running, you are missing a cylinder., which would explain a huge rpm drop.

 

Or just let it idle for a minute and touch each header to see if one isn't getting warm.

Even better, an infrared thermometer is a cool kitchen gadget that also comes in handy in the garage.

 

Well if it's got a full r55 system and aftermarket filter and no tune you're gonna loose a lot of low end.

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Well if it's got a full r55 system and aftermarket filter and no tune you're gonna loose a lot of low end.

I forgot to mention that it got a tune and has a power commander.

So what was repaired, it's not a technical question. He (seller) has the paperwork? Why don't you have the paperwork? Paperwork, receipts, things done follow the motorcycle, previous owner has no use/need for them since he sold the bike. Maybe one of the injectors is clogged and not spraying enough fuel. If you want help, you have to answer the questions :hammer

I am very sorry about this but I really have no idea on what happened. He told me that the bike was in the shop for 2 weeks and they had a difficult time figuring out what the problem was. It was apparently fixed and they gave him a deal on the service. I am going to call the guy that on all the invoices, ask him if he remembers the situation and get back to you when I have more information.

 

Congrats buddy, just goes to show it can be the most simple things. Pays to keep a level head with these sort of thing. Enjoy!

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Sounds strange to me that a spark plug would be an issue on a late model fuel injected bike. I can understand on an old carb fed bike but lucky for you, it was an easy fix!