wont go straight under 30
 

i just changed my own tires, and also balanced them! the only problem is under 30mph when i let off the handle bars it starts to steer one way, then the other, kind of like a S. im not sure if it use to do this before because i never took my hands of the handle bars. i took it out after i did the back tire and noticed this, then i did the front and it still does it. did i maybe balance it wrong? or align the back tire wrong? or is this just normal? over 30 it goes straight with no hands, and under 30 if i have my hands on the handle bars i dont notice anything wrong.

It sounds like: axles not aligned correctly or possibly a bent axle or a warp in a wheel. I suppose tire balance could be an issue

At slow speeds you're not generating a lot of gyroscopic force with the wheels so any imbalance (including you wiggling and breathing) can cause the bike to steer oddly. If you notice no effect while holding the bars then I don't see an issue. If the bike is fighting you while holding the bars then we need to diagnose this further ... but it sounds normal to me.

i dont know if the 600rr has different size spacers btw the wheel and the swing arm. maybe u put it backward and the rear wheel is off center by like a MM or something

didnt mixed the spacers on the front up did you? If the rear was out of alignment it just wouldnt track straight, should wiggle/wooble cause of it.

after riding it for about a week, rebalancing the wheel, and realigning it, i think im going to agree with you. ive also gotten the bike pretty low, and ive taken it up to a pretty good amount of speed and never once felt there was something not right. infact i even forgot about it until i seen this post.

but when i was aligning the rear wheel, i took some string and some weight, i taped it to the top of the tire and let it hang down. i did this on both sides and the gap on the left is a little bigger then the one on the right, is there a way to adjust this?