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
moto619

bogging at full throttle when engine is hot

10 posts in this topic

I have an 03 WR 450 that started bogging only at full thottle and only after riding for at least 15 min. I have already cleaned the carbs and checked the jets, replaced the airfilter with no luck. Any suggestions?

Share this post


Link to post
Share on other sites

Put in a new sparkplug and ride the bike. When you go full throttle and the bike bogs immediately shut the bike off. Pull the plug and see how it looks (white/black-smelling like fuel). That should give you an idea what to look at unless you already can tell if it's bogging from a lean or rich condition.

Another option is checking the fuel line for restrictions/kinks as well as all of the carb vent lines. Has there been a significant change in riding conditions since this problem started?

Share this post


Link to post
Share on other sites

If your plug looks white, you are running lean. Start by checking for an airleak by squirting some wd40 around, then if that wasnt the problem, start upping the main jet. Once your bike runs better with the larger jet, fine tune it with the needle.

Share this post


Link to post
Share on other sites

I agree you most likely have an airleak. I wouldn't ride it until you find the problem.

Share this post


Link to post
Share on other sites
If your plug looks white, you are running lean. Start by checking for an airleak by squirting some wd40 around, then if that wasnt the problem, start upping the main jet. Once your bike runs better with the larger jet, fine tune it with the needle.

Hey Yamaster,

When you are talking about air leaks, do you mean on the intake side or the exhaust side? Can you explain a bit more what the testing procedure is for that, ie where exactly do we spray the WD40?

Thanks.

Share this post


Link to post
Share on other sites

Sounds like your not getting sufficient fuel flow from the tank to the carby and are running out of fuel in the carby. Pull your tap out and clean the filter. Could also be crap in the line above the needle and seat (fuel inlet to carby). Check the one way valve in the tank breather is letting air in. Also, as someone else mentioned, check your breathers are clean and free to flow air.

Share this post


Link to post
Share on other sites

You spray the wd40 on the intake side. Start from the airboot between the carb and the airbox and work your way down to the boot between the motor and carb. If you have an airleak your rpm's will change when sprayed with the wd. Hope this helps.

Share this post


Link to post
Share on other sites

A friends WR 250 started doing this so I pulled the one way check valve out to the gas cap and now it doesn't do it anymore. The valve seems to be very sticky in the housing. WR Dave

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