sled bogging at full throttle

[stevel]

I have a 1998 vmax 500 xt , took it out this weekend , runs great most of the time , at full throttle across the lake the sled bogs down and actually slows down , also a bit of a bog on the bottom end only at full throttle . Plugs are fairly wet and black , changed them and still bogging , Is this a jetting issue all of a sudden or are there any other factors that can cause this only at full or mostly full throttle , sled would only hit 100kph at best . It wasnt too cold out but should not be bogging like it was .

[catmando]

Make sure your not taking on snow in the airbox!
Jetting is a possibility!
catmando!

[99summitx]

I had a 500xtc and did the same thing, found jets to be pluged and needle had a coating of varnish, cleaned it all up and dropped the needle 1 washer to lean it up. Worked great after that untill the clutch blew up.

[stevel]

Thanks I'll clean em up and see , airbox is not taking on snow and possibly its the warm weather but shouldnt be so bad , I think it's running too rich so if it doesnt coem around prob a good time to replace her , thanks for the replies so far

[sledbunnyracing]

If your running last years fuel than you will want to get it out of there and put fresh fuel in. Pull the carbs and clean everything up with your basic NAPA carb cleaning spray.
You may also want to put some atuomotive Iso in the tank to make sure there is not moisture mixed with the fuel.

Let us know the results.

[stevel]

Don't really know what i'm doing but i'll pull em Wed morning and clean em up , see what jets are in em and go from there , Can't be too hard with all this info on the net , thanks .

[Lococoin]

set aside any rubber or plastic parts in the carb before you start the cleaning. its not recommended to soak those parts with the cleaners.

[99summitx]

When you clean your jets you can use a drill bit but only rotated with your fingers or you'll do damage to the jet.

[stevel]

Took the carbs off this morning , havent even got em open yet but I have a lot of delt dust in / around airbox which i'm cleaning right now and a lot going into the carbs so I'm thinking this must be my issue so far , will take carbs apart tonight . Anybody have this issue , is there a better way to protect airbox with something over the foam or better / new foam ??????????? so I don't have to do this again although it is nice to learn .

[koby]

Originally Posted by stevel

Took the carbs off this morning , havent even got em open yet but I have a lot of delt dust in / around airbox which i'm cleaning right now and a lot going into the carbs so I'm thinking this must be my issue so far , will take carbs apart tonight . Anybody have this issue , is there a better way to protect airbox with something over the foam or better / new foam ??????????? so I don't have to do this again although it is nice to learn .

From the info provided......It ran good when you shut it down last season, so your tuning is good......Fresh fuel is a must......Clean the carbs. New pilot jets on average are $ 6.00 each, I would replace them......Filter for airbox should be replaced......The belt dust is common. This is an issue on my ol' 700 ZR......Liberated a pair of wifey's nylons, and use as a prefilter over the airbox inlet. You'd be amazed as to how much belt dust they catch.

Koby

[justwheels65]

I have 97 vmax 500 had simalir problem one of plug wires was cooked had to change spark plug end. 100 mph aint to bad though mine would top at about 65 when that happened