Hello all. First post here.
I've been having issues with my Raptor for the past 4 months. And have tried sorting things out on my own - to no avail. Thus, here I am..I need a second opinion! After reading through multiple threads to try to find an answer (again with no success), I know that I need to tell everything so you guys know whats going on. I'll start with alll the details, and I'll sum it up at the end if you don't feel like reading.
2004 Raptor 660 - Stock Carbs and Jetting. No additional mods at all - the bike is STOCK in all aspects.
Bought the bike used in Oct. of last year. Ran great, everything was fine. Then needle and seat started to stick and the carbs would leak at idle and when the bike was off.
I bought a new needle and seat (from Yamaha Dealer) in January, as well as float bowl gaskets, and put them back onto the bike. Ran fine. Then I noticed that there was a leak on the intake boot that sits between the carbs and the head. This caused the quad to run lean (red hot pipes). So then I bought new intake boots and put them on. While that was happening, I decided to clean the carbs because the bike would backfire through the exhaust when you were running around half throttle and then hit the gas to go faster.
Took everything apart. Kept each part seperate for carb 1 and 2. Soaked in petroleum based solvent...the usual. So I go to put things back together. I have the service manual so I follow everything to factory specs...making sure that the right size jets go in the appropriate carb, etc etc following the manual.OK great.
Ever since then the bike will not run right. I've taken things apart and adjusted almost 1000 times. Tried every possible combination for Needle Jet, idle screw, tried to sync the carb butterflies 2 different ways....nothing and I mean nothing works. Its always the same issue. Bike idles fine..beautifully. But from 1/4 to 3/4 throttle it is backfiring, spitting, and stumbling. I can give it full throttle from idle and it takes off! And if I'm riding it I can go full throttle all day and have no issues. Its the mid range which plauges me. But i've adjusted the needle jet to every position.
Also, I know that it is NOT THE PARKING BRAKE OR REVERSE LIMITER. because i've had the bike running WOT down the field with no issue at all.
So here's my theory. When I took the carbs apart the first time, something must have happened: I messed up the jets- whether I marred them or did whatever to them.
TOO LONG/DIDN'T READ
Stock Raptor, Stock Jets
NO LIMITER ISSUE
With stock specs (clip 3 needle) 1-3 turns idle screw
Bike wont run right - 1/4-3/4 hesitation, fine WOT
I'm thinking that I will next get a new jet kit (stock of course) and see where that gets me.
Just looking for a second opinion? Am i doing the right thing?
ANY...and i mean ANY ideas are appreciated!!! Thanks!