My father-in-law purchased 2 AC's for my boys a 2005 50 and a 2005 90. On the 50 I put in a new Spark plug with the correct gap and it runs but has no power. What do I need to adjust? I'm mechanically incline but I'm not familiar with ATV's or bikes. And on the 90 the inline fuse blew(little cartridge fuse 7A) just off the battery on a size #18 wire or so,when I replaced it and tried to restart it the CDI box Fried it sure makes some stinky smoke and plenty of it. Any ideas of what to check before i install the new CDI so I don't burn it up also?? or could it be that the CDI was bad and thats why it fried... Again I'm just not familiar with these things yet, I just want to see if I can fix it before hauling them up to the AC dealer.

Any help would be greatly appreciated... Thanks...

 

OK,,, I'll take a shot at this...

The 50,,, I'll take it that it ran fine before the plug change... Check the plug and make sure the plugs look the same in all ways... Plugs come in all sizes...

The 90,,, You have a short somewhere... The fuse blow the 1st time for some reason... But it could have been just a bad CDI... I would get a new one and try it... If that fries you know it's the wiring... That's the only way I can think of to find out if it was the CDI or the wiring...

Hope this helped...

 

instead of blowing the new cdi up go buy a tester for 15.00 and disconnect 1 plug on the harness and disconnect the plug on the other end and test it, it will tell you if something is wrong if not go on to the next plugs on both ends and check them, you will find the problem eventually

 

These quads have a safety kill switch too ( probably a little white plug ) . Make sure that is all the way in or you will get 0% power.