arite guys i need some help i got a 02 raptor 660 an i can't get it to start with out pulling it with another quad. but once i pull start it it will start right up an run fine until i shut it off an let it sit for over an hour then it wont start. i put a new plug an a new battery still has the problem. now recently i pulled the baffle out of the exhaust an rejeted it so wud that hav anything to do with it? please give me some insight.

 

I have a 05 that would do that to me. I fixed mine by putting a zip tie around the fuse block. An easy way to tell if this is your problem is to pull the seat off, and wiggle all of the fuses around and then try to start it. This always worked for mine.

 

Answer me a couple questions, and I might have the answer....

When you push the Start Button, does it crank once, long pause, then make the fast "click-click-click" sound??

Next....Feel your positive Battery lead when you hold the Start Button....does it get hot???

If it's yes to both of these questions....then you are experiencing the same thing I did...

Your Decompression Cam is worn out. It's about a $200 repair unless you are mechanically experienced.

Here's another test...

Take out the Spark Plug and try pushing the Start Button again...

..if it's the Decompression Cam, the Raptor will crank fine (with no compression)..

Let me know!!![img]i/expressions/face-icon-small-wink.gif[/img]

 

arite im gona try that


thanks

 

when i push the start button all it does is the regular starting crank noise but never fires over itl back fire alot too and sound like it wants to start but doesnt

so im gona try wut u said and c wut hapns

thanks

 

<div class="FTQUOTE"><begin quote>Originally posted by: YFZracer88

when i push the start button all it does is the regular starting crank noise but never fires over itl back fire alot too and sound like it wants to start but doesnt </end quote></div>

OK...if it cranks like normal with the Spark Plug in, then it IS releasing the compression, so the Cam isn't the problem. Check all electrical connections to make sure nothing worked its way loose.

Possibly a bad CDI???

 

If you are sure the carb is jetted correctly, then I would check the valve clearance. I had this same problem on my '01 660, checked everything with the carb thinking it was a fuel problem. The thing would start and run fine after it warmed up, but you could not get it to start under it's own power when cold. The Raptor also felt like a new machine after adjusting the valves. Good luck, I hope you get it running good soon.

 

ok wut is the CDI

HOW DO I CHECK VALVE CLEARENCE


IM USE TO DIRT BIKE OR A HONDA 4WHEELER SO IV NEVER HAD THESE PROBLEMS LOL.

 

In order to check the valve clearance the front fenders and fuel tank have to come off. On the top of the engine there is a plate with four allen head bolts, this is the intake side valves. On the front of the engine the two covers side by side below the plug wire are the exhaust valves. I would recommend getting the Yamaha service manual or Haynes before trying to adjust the valves. If you want to try it with out a manual I will give further directions and the specifications. One thing is the engine needs to be completely cooled off before starting this process.

I just found a complete write up of valve adjustment:
http://www.raptortranny.com/in...=view&id=33&Itemid=41


Good luck, and let us know how it goes.
Curtis

 

hmm that is exactly what mine is doing, well the clicking and pausing anyways. im gonna take it tomorrow and see if they can diagnose it. is it a hard thing to replace yourself?