Bogging at (very) low speeds up hills

[VTNewb]

2003 KDX 200
V-force reeds, airbox cut off, FMF gnarly pipe
42 pilot 155 main jet
needle lowered by 1 front middle (circlip moved 1 up from center)

The big bogs at very low speeds under heavy load going up a hill.
This is my GF's bike and she got stuck on a ditch on a steep hill so I had to ride it out, I found myself having to clutch in to rev up and drop the clutch to get the power to normalize again.

Where do I start?

 

[ebeck]

Air screw and rear sprocket. If you do alot of slow up hill you'll need a 49 tooth.

I was using a 40 pilot and 152 main. changed to a CEK needle seconf clip fro the top (She'd probably prefer the DEK) and dropped to a 38 pilot. Dialed in air screw, perfect jetting, no bog uphill or anywhre with stock gearing. 49 was too tall I could ot keep wheel from spinning with my mids. I have the RB carb and R head though.

 

[jschiller]

yeah, jet sizes sound too rich to me

 

[G. Gearloose]

42 pilot could be too lean for the stock needle. try the 45.

 

[VTNewb]

42 pilot could be too lean for the stock needle. try the 45.

I put in a 45 and the problem is much better. It's not perfect, but I doubt it ever will be. Thanks!

 

[VTNewb]

After doing some reading, it seems tons of people have trouble with what I'm describing. Is it possible that the KIPS valve is siezed/broken? I only notice bogging under heavy load up hills.

 

[zeerx]

Don't dump the clutch. If you feel the bike slowing and beginning to bogg on an uphill, grab the clutch, raise the rpm's and ride the clutch up the hill. I found that KDX clutches can take a lot of abuse.

Race gas helps too.

Cheers.