Blaster jetting, need some help!

[PurplePants]

Hey guys i'm new to this forum and need some help with my Blaster. It is mostly stock, when i bought it the carb was very gummed up so I replaced it with a niche industries one off of amazon. It has Boyesen power reeds in it and the guy before me drilled six holes in the air box lid. I just put a full Bills exhaust system on it and i cant figure out the jetting. I had the stock pilot jet in it to start off with and then i tried a 35 and it seemed to run fine but was fouling plugs (too rich i guess), now i have all the stock jets in it and it is driving fine but the idle hangs like crazy and it is fouling a plug almost every ride, any ideas? Thanks!

 

[Larry's Shee]

Have you checked trans level? Does it smoke a lot?
Have you ever done a leak down test?
Exhaust has to be sealed 100% at flange to cylinder and flange to pipe.

Good possibility that the carb is junk, just like everything else Niche sells.

 

[Larry's Shee]

https://www.blasterforum.com/threads/oh-no-dont-use-cheap-chineese-parts.72185/

 

[Larry's Shee]

What size main jet do you have in now?

 

[PurplePants]

I actually just threw in a 260 and put in a BR8ES and shes running like a beauty. It had a BR9ES in from the previous owner so thats what i thought was the right one. Also I've actually had good luck with Niche Industries so far, my brother has rebuilt a few 400ex's and has used some of their stuff. Do you mean the oil in the transmission level? I've also noticed that the pipe is leaking just a tad from the flange so i'll try fix it, i did'nt know that made a difference.

 

[Larry's Shee]

That's why, a nine is a colder plug. Oil sight glass on clutch cover. Thought maybe was sucking trans oil fouling the plug.