My King

Hi there everyone. Just seeing if there is advice on a problem I have before I start digging too deep. 
I recently bought this creally nice 2004 King quad ltf300 with only 2400km..
Everything things works great except when engaged into 4wd or diff lock it has a clicking noise ( sounds like broken teeth etc) are the front diffs known to blow?  Or the transfer from engine?
I am yet to test on some loose ground to see if I'm getting drive at front .
I will be driving in to find problem in next few weeks but thought I'd see if anyone might know what it is first. Cheers

I know this tooic has been addressed by many, I’ve looked through many forums and pages. I did not find anything like the problem i have.
I have a 2007 Kingquad 450. I have a new fully charged battery. When i turn the key, the dash flashes and seems to struggle before getting fully lite. We can hear a small relay near the computer clicking, i think it is the fuel pump relay. When i turn off the engine kill switch and press the starting button relays click and all the power shuts off, i turn the key off, engine kill switch then start over, power is there. Atv will start with pull start, but not elextricly. if i try to use my winch, all power cuts and engine dies. 
 
Can anyone tell me what it may be? or has anyone fsced an issue like this before?

Does any one know the proper adjustments for all the jets in the carb., I just replaced all the jets and I'm getting a lot of backfire also it seems like it isn't getting fuel or bugs down while idling and or riding any help would be great. Thanks

Hello Everyone.
I was just given a mid 90's King Quad. I got her running today. I have so many questions. I'm Tony from Florence Montana. It runs excellent. I want to change fluids and have some fender work to do. Anyone here have some info on finding out exactly what year, what manual to get, etc? Thanks in Advance. Thank you all for this Forum! 

Hi looking for help. My 700 fuel pump won’t cycle when I turn key on also my digital dash is not displaying anything it does light up yellowish but nothing else. If I pour fuel in the intake it will start for second