2003 Raptor 660 problems

Reply Subscribe

Thread Tools

Search this Thread

Feb 25, 2009 | 03:28 PM

clarkplaya17

Thread Starter

Weekend Warrior

Joined: Feb 2009

Posts: 1

Likes: 0

2003 Raptor 660 problems

I just bought a 2003 raptor 660. The bike would start hard and idle only with full choke (which was like crap) backfireing like crazy. The guy i bought this off said it needed the valves adjusted. I recently cleaned the carbs (top to bottom), I changed the oil, changed the plug, and flushed the gas tank. There was water in the gas because the guy let it sit for 3 years without winterizing it. I am looking for an answer to why it wont run normal without choke on all the way. Please HELP!!!!

Apr 29, 2009 | 08:07 PM

boudro13

Trailblazer

Joined: Mar 2009

Posts: 26

Likes: 0

u might need to clean the carbs again to make sure no gunk made it's way back into the carbs and make sure the diaframs aren't torn for the needles if they r damaged or r real still they might b a part of ur problem

May 5, 2009 | 09:37 PM

flyinscrammy

Pro Rider

Joined: May 2006

Posts: 265

Likes: 0

From: Rush Valley, Utah

Sounds like you need the valves adjusted also..... Maybe even a top end rebuild. When that happened with my boy's 05 Raptor 660R we took it apart and actually found a small rock that had been sucked into the carb, through the carb, through one of the intake valves and landed on the piston, ultimately bending one of the valves.......

It also just happend on the 05 yzf250 that we have, the rollers on the cam were worn out ultimately tearing up the valves.....

We've spent alot of money in the engine shop....

May 6, 2009 | 01:33 AM

tfunk22008

Range Rover

Joined: Mar 2009

Posts: 119

Likes: 0

id check the proper jet sizes to he might have put the completly wrong jets in one of the carbs i definetly wouldn't run it long though until the problem is found

Jul 19, 2018 | 12:07 AM

TylerByz250f

Weekend Warrior

Joined: Jul 2018

Posts: 1

Likes: 0

About that popping and only idles with choke

It could be extremely rich fuel mixture. My 03 Yama yz250f dirtbike was doing that. I had to use like 1/4 throttle just to start it. And then it wouldn’t idle. And I pulled the choke and it idled just fine because it got it off idle barley. So your bottom end might be extremely rich. Check ur plug. It will tell u if it’s rich, it will be all grimy and black, if lean it should be like a white chalk color. If it’s jetting at all. Could very well be valves. Just rebuilt engine on that bike and when got done with break in it wouldn’t start without a push because it was just sooooo rich on bottom end. Rapes all my friends’ quads and bikes now.