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XT500 w/36mm White Bros Kit / "Jetson" Supertrapp - running way too rich..

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Does anyone have any experience with this White Bros Carb kit? 36mm Carb..KN Filter.

I've got an XT headerpipe and TT rear pipe with a Jetson Race - Supertrapp Knock off type muffler (from an XR600)...

Installed the carb got it to fire on the 3rd kick (took two to suck in the fuel it seems) but at idle and everything above, it's running way too rich.

It idles but as I click into the needle jet range - it's blubbering and surging - if you hold the throttle open, it's as if you're opening and closing the throttle as it loads up... (I also put in a purolator fuel filter, but I'm going to swap that out with a smaller motorcycle type "disk" filter as this thing has a huge gap of air in it and I'm wondering if that's contributing to the surge...

On the main jet, full open, the sucker sings, it's just that the blubbering beast - (oily gassy plug and black sooty rings on the exhaust) is far too rich below..

I moved the needle clip up to lean it out one notch - but haven't ridden it yet as it was kind of late to terrorize the neighborhood with that beast.. (Still have one left should I need to go leaner)

I thought about going up two notches on the needle, rather than one to save time, but I hope one is enough...

Also - the factory recommends a bp-6es (colder plug) and on the earlier models, it came with a bp-7es, the original owner had a B8ES in there and it ran fine in the stock configuration, prior to carb / exhaust / K&N mods... What do you guys run here?

Thanks in advance!

JP

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2.5 or 3.0 slide? Is that the Mikuni kit? :ride: Also if you have to run a hotter plug then you are just masking a problem. :applause: Those do take the 'p' plug. On NGK plugs the smaller the number the hotter the plug. :thumbsup:

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I am running this carb on my gals SR and it was also way too rich on the primary jet. I think it had a 35 in it. I went down to a 30 and it is still too rich but acceptable for now. I am going to keep fiddling and let ya know.

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