re-jetting needed?

[El__burro]

Replaced the needles with brand new ones, put the clip on 3rd gap, cleaned it all and.. it goes much better. Now it struggles a bit on the full throttle.
I didn't manage to check the plugs.
Any advice?
Thanks
el__burro

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[JamesH]

Did you replace the needle seat? They're generally matched.

[Trigger]

First question : why are you running it at full throttle ? Has this engine been rebuilt to any type of race spec ?
Honda spent a billion yen and thousands of Honda technician man hours to get this engine right so, why do people think they can get it running better with a few £'s.
As a wise man said once; If you want a faster bike, go out and buy a faster one.   

[Johnwebley]

Replaced the needles with brand new ones, put the clip on 3rd gap, cleaned it all and.. it goes much better. Now it struggles a bit on the full throttle.
I didn't manage to check the plugs.
Any advice?
Thanks
el__burro

Sent from my SM-G935F using Tapatalk

  to check the plugs gives a good insight of whats happening,

 run the bike at constant 6,000rpm on half throttle ,then use the kill switch to stop and pull the plugs out ,check the colour,
 as for full throttle,you need to run at least 8,000rpm and full throttle under load ,then do the same,check the plug colours,

as Trigger asked,how many miles has the motor done since rebuild?
 maybe leave full speed testing till it has a few hundred miles on it

[El__burro]

Engine has never been touched.
As i mentioned at the beginning I wanted the bike to be more responsive not faster.
I'm getting there..
I'll try my best to do a "plug chop" but it will be hard as i don't have a rev counter.
Thanks
el__burro