Can't quite get the jetting right on the XR600

[PD10913]

I have made a few mods to my 98' Xr600, ie FMF Powercore 4 pipe, snorkel removed etc and I've tried various jet setups and at the moment the 158/68 seems to work pretty well but when your let off the gas it hesitates and continues revving for a second before dropping down.

Does this mean the mj might be a bit too big?

 

[XR250rdr]

On the stand or while riding?

 

[Matt90GT]

I have had one of those beast in the past.

Best solution is to get the edelbrock carb with AP pump in it. It will eliminate the bog/hesitation and also the cough out and die randomly issues with the bike. It also eases starting.