Yamaha XLT800 no speed

[elektromouse]

Yamaha xlt800
after rebuild i mean cleaning engine and carbs can not make it move faster then 2-3 m/h

engine starts right away idling good, but as soon as i open accelerator nothing happen
i did rebuild carbs. still had same issue. i bought another set of carbs from good jet ski.
same issue. good start no power in water

i did remove impeller and check it, looks very good. no problems at all
was about to replace wear ring, bought plastics insert but realized i can not remove metal one... but old one looks ok.
but i will by this piece and will replace it... but i think it not going to fix my problem. that's only one thing what i can think about

any help? any thoughts?

[Myself]

Does the engine rev? Build up rpm's?

[elektromouse]

oh yeah.
it's even has enough power to jump on the trailer.
i can't tell about rpm for sure, because dash broken, but what i can hear, for me, sounds like it's working on full power. when throttle open.
at first i thought gas/air mixture very lean. i did carb adjustments and get dry, brown spark plugs, which is sign of good mix. according to web.

i can make a video to show how it's sounds. and how it's working in general.

[elektromouse]

not sure what is 'rev" means

[Myself]

Rev is the RPM's.....same thing. If it sounds like it's building full power but the jet ski just feels sluggish and does not go full speed I would look first at a pump seal kit. These models have a problem with lots of cavities around the jet pump inlet. This causes turbulance and poor performance of the jet pump. Many people describe it as a slipping clutch or spinning your tires in the mud.......no traction. They also have a tendency of spinning an insert inside the hull when you try to remove these parts so GOOD LUCK! Easiest to just buy a pump seal kit. I seal mine by cutting chunks of styrofoam and sealing that into the parts with epoxy resin.

https://youtu.be/hIZrAEyosUA