Going to start with information on the quad 2003 Yamaha Blaster Been bored 2 times due to piston welding itself to the cylinder replaced piston with Wiseco piston and rings and had the cylinder bored and honed Cylinder was ported and polished by Angus Kennedy from Kennedy motorsports Head squish redesigned or whatever from Angus Kennedy from Kennedy Motorsports Vforce 3 reeds 35mm PWK Keihin carb Vito fat bastard exhaust Factory seven big air box Timing moved 3 degrees (not sure if it does anything been that way since like 09) vitos heavy duty clutch +4 swing arm +3 +1 extended A arms stainless steel brake lines gearing is up 1 in the front 400Ex front and rear shocks So the back story when this happened was out riding for about an hour and a half and it started to not want to go faster in high RPMs. It still cruised around without issues and started but when you go 3/4 or full throttle and try to get high in the power band it just wouldn't go. It has the low end hit and hits the bottom of the power band but thats it. Fast forward to this week. I cleaned the carb 100% except where the pilot jet is because i couldn't get it out. (I have tons of tools and non of my screwdrivers fit there) i pulled the reeds and checked the them and the gaskets and all look good, and didn't see issues on the side of the piston skirt you could see through the intake ports. changed the plugs and the gas with mixture of 32:1 with yamalube 2r and 91 octane gas. Took it out for a spin and same issue. The bike will start, rev, and you can cruise without issues but no high rpm power. Its like it hits a rev limiter 1k RPMs into the power band instead of say 4k RPMs of power band for example Tonight i will be pulling the carb again and checking what the main jet size is and post here but i dont remember what it is. I will be checking needle position at the same time as well and reporting back. I did a compression test with the motor cold, full throttle and it was 100 PSI of compression so not sure if thats the issue but i dont want to rebuild the top end if its not going to fix my issue. I have read a few threads and one said they fixed it by putting the washer on the main jet but all the diagrams i can find the PWK 35mm doesn't have a washer on the main jet. Is that true or it needs one? I am trying to sell the bike and would like this fixed as soon as i can. ************NOTE: im at 5500 ft of elevation also******************* Thank you in advance for the help.