HEADS UP!!!

Site upgrade in progress... Core site functions are working, but some non-critical features/functions will be temporarily unavailable while we work to restore them over the next couple of weeks.

Please post any bugs you encounter, but before you do, check to see if it's already listed.

Thanks for your patience while we work to improve the community.

Sign in to follow this  
Followers 0
micahmorgan

Problems Linked or Not

6 posts in this topic

I have two problems that I need help with. My engine is stuttering at 1/8 to 1/4 throttle and I'm burning a little oil. Any help with each problem or a combination fix?

The engine stuttering, I thought was a jetting issue when I went on an out-of-town ride, but now the bike is at home and I still have the problem. At higher throttle, everything sounds and feels fine. After this weekend's race, I noticed some black soot around the exhaust. I have the JD Jet kit and jetted to the recommendations. Today, I played with the fuel screw and the bike still ran with it turned all the way in. I changed the air filter and had the same results. The bike used to run fine and I didn’t make any changes.

While I hovered over the bike this afternoon scratching my head, I checked the oil on the dipstick. It was low so I filled it back up to the right level. I needed to add 200 milliliters. I have about 7 hours of riding since the last oil change.

Do I have a problem or problems? What do I need to do?

Share this post


Link to post
Share on other sites

Hi,i have just spent a week getting my jetting sweet and to me it sound like you are running a bit rich on your needle and luckily its the easy to get to i didn't have to take my carb of to do mine on my 02 426 ,just took tank and shrouds and seat off undid the clamps and spun it toward the shifter side the is only just enough room to get the Allen key but it worked then used pointy pliers to pull the needle .

Try one or two clips up on your needle if that doesn't work pull the carb out and give it a good clean .

Also check the fuel scew still has its o ring ( that little trick got me good )

Share this post


Link to post
Share on other sites

If the jetting is too rich, will it burn oil? I know how to jet the needle, fuel screw, and the main.

I have a 09 YZ 450F.

Thanks for the help.

Share this post


Link to post
Share on other sites

Also check the fuel screw still has its o ring ( that little trick got me good )

Yep. I was running rich. The O-ring was cracked. What really sucks is while I was fishing out the O-ring, I dropped the washer that goes between the O-ring and the spring ... and I can't find it. I spent an hour searching a 10-foot radius.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!


Register a new account

Sign in

Already have an account? Sign in here.


Sign In Now
Sign in to follow this  
Followers 0