2001 summit 800

i took my 01 summit 800 out the last two weekends and around 4-5000 rpm it bogs like its not getting spark. i replace the sparkplugs and wires, cause on one wire the clip was broken off. after that it still did the same thing, recently found out that my intake boots were cracked, could that be...

i have a '01 summit 800 and i just put an 8'' riser on it, in turn i had to extend all the wiring, throttle cable, and brake line. the problem is, i haven't gotten to ride it yet. the first time i went to ride it it started up fine, idled fine, but when i reved it up to 4000 rpm when the clutch...