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Discussion Starter · #1 · (Edited)
Bought it at ~23000 miles. I've seen it hit 90mph once downhill on the highway. 95% of the time it maxes out at 81-83mph.

It is throwing a check engine light, took it to dealer for full service/rear tire replacement, and they offered $250 just to diagnose the cause (62 1103 code, subthrottle valve actuator). I think its cheaper just to replace the entire throttle body myself ($80).

Other than that, I have no idea what could cause this. The exhaust pops on deceleration (lou vance gp corsa). The guy also told me it had a lowering kit, so maybe it was possibly modified in another way? Possibly needs new clutch kit?
Tire Wheel Vehicle Fuel tank Plant
 

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I'd start looking around to see what else has been modified.

Look at the air filter - stock?

Does it have any type of tuner, like a Power Commander, under the seat?

Is it making any engine noise, like ticking? It could need a valve adjustment.

I don't think you are looking at the right part, if it's $80 for a throttle body, and I don't think it would need to be replaced. They may need to be synced.

I would look deeper into the code that it's throwing, and try to isolate a part that could be faulty.

If you don't care for the loud exhaust, you could start looking around for a used stock system, which may make it run better than an improperly-tuned aftermarket exhaust.

EDIT: That license plate looks like it would get sucked under the tail, and possibly cut the tire, if you hit a good bump.
 

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That looks like the Leo Vince slip-on, which absolutely will pop when you roll of the throttle. That's normal for that exhaust. Since it's a slip-on, there's no tuning adjustments that should've been done. You will lose maybe 1 hp with the slip-on, but it's not that noticeable. I have the carbon fiber version of it, which I run without the baffle, and I can hear all sorts of pops when I roll off to engine brake. It's also incredibly loud without the baffle, but I like it.

My bike is also lowered an inch, but again, that's not going to affect the top speed. What will affect it is your size (height & weight) along with your body position. I'm 5' 1" and if I tuck down behind the windscreen, I can easily hit 100 mph on a flat, more on a downhill. If I sit up above the windscreen, that drops significantly. For giggles I watched my 5' 10" husband hit 110 mph on it and then watched it slow down to about 85 mph when he sat up - the body acts like an air brake at that point.

I would ask the former owner when the last time it was serviced, including the valve adjustment and the spark plugs replaced. Also, pull the airbox and clean it.
 

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@toncey - Like jkv45 mentioned, I would definitely check/clean/replace the air filter first. And if the engine is running OK otherwise I would also check the engine's compression as the bike may have had 23,000 hard miles put on it by the previous owner. Regarding top speed, I haven't checked mine in a long time, but my 2014 hit a freckle under 100mph (stock exhaust and gearing) and I'm a fairly heavy guy (200 lbs).

Good luck!
 

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Discussion Starter · #7 · (Edited)
Replaced the clutch, and that seemed to have fixed the issue for like 100 miles. Then the issue came back, then went away again. I noticed when this happens, I cannot rotate the throttle as much as when the bike has full power. I lose range of motion, and cant physically roll the throttle into the power band. Is this a clutch issue or something else? When I disassembled the bike I noticed it has a Sub throttle Valve Actuator Eliminator, which could be the cause of the check engine light.
 
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