RPMs drop while under full throttle in 6th gear

[JohnnyBusa90]

I was riding my bike on the highway and while going full throttle in 6th gear I notice a slight hesitation in power (about 1 second). I full throttled it again and at 8k RPM I notice that it would drop slightly to 6-7k rpm for 1 second then go back up to revving again past 8k rpm. I was experiencing this but to a lesser degree during my previous riding sessions and I just thought it was the tire slipping on the highway (got dual compound shinkos on the rear). But I noticed that it has gotten worse.
Could this be a fuel pump issue or a worn clutch issue?

 

[sixpack577]

Not the clutch, as that would happen in every gear and every time, they also tend to go out quickly, and slip throughout the rpms.
It sounds like a fuel issue, the pump or pressure regulator, but that usually happens around 6k rpms when fuel demand really starts to rise.
It could be gummed up secondary injectors, as they tend to get alot less use than the primary injectors, not spraying until 8k+ rpm.

 

[HayaWakened]

... secondary injectors ... tend to get alot less use than the primary injectors, not spraying until 8k+ rpm.

Don't remember where I found this but likely this forum. @smithabusa , maybe?

Pretty sure the X scale is % of WOT (= 100%).
8k before anything close to 50%
+1 @sixpack577

 

[Dnyce]

Is it only in 6th?

 

[JohnnyBusa90]

Is it only in 6th?

I think it only happens in 6th gear or maybe under very hard acceleration (full throttle). I think it could be a partially clogged fuel pump. I didn't notice the issue in any other gear.

 

[JohnnyBusa90]

Ok. So I did some testing on the busa. I noticed that it would start doing this when I'm around the halfway mark on my fuel gauge but when I am at a full tank of gas the issue is non existent. Hmmmm.

 

[jwcfbd]

Ok. So I did some testing on the busa. I noticed that it would start doing this when I'm around the halfway mark on my fuel gauge but when I am at a full tank of gas the issue is non existent. Hmmmm.

That makes it sound like your sucking in air at lower fuel levels. But it only does it in 6th gear?

 

[Mythos]

Ok. So I did some testing on the busa. I noticed that it would start doing this when I'm around the halfway mark on my fuel gauge but when I am at a full tank of gas the issue is non existent. Hmmmm.

Just a thought, could it be the weight of a full gas tank is helping push the fuel through a fuel pump or filter that is/are obstructed? Half full, gravity isn't helping as much.

 

[JohnnyBusa90]

Ok fellas. Here's an update. After using Berrymans B12 Chemtool in my gas tank for about 3 tank fulls I noticed I don't have this issue anymore. Back to accelerating like a champ! P.S I boroscoped my gas tank to look for any rust... it was clean. Fuel system was most likely partially clogged from sitting for a while.