I sure hope you get this thing running right. Have you done the cam mod?

You can put the 170 in but IMHO it might be a little rich. If it was me i would put the 170 or 168 45 pilot. If you use the stock needle 4th clip.

 

the stock needle is already ont he 4th.....I am counting from the top down...should I go 5th?

 

the only advice i can give to you is buy a Honda 450 and kiss your troubles goodbye.

 

idiot

[img]i/expressions/face-icon-small-mad.gif[/img]

 

I don't know if this will help you or not but I run a 168 main 45 pilot and clip on #5 with the stock needle. The spark arrestor has been removed and I have an EHS Racing airbox lid which is supposed to let in the same amount of air as no lid at all. It hauls *** from bottom to top with no dead spots or backfiring. I am at ~ 1400' elevation. I would think you could jet at close to this with a slightly larger main to compensate for your modded tail pipe.

 

try a 165 or 168 main

 

type dagdog jetting in your search engine and go to the daddog jetting page. A lot of great information there about jetting issues.

P.S. Don't listen to those Honda guys, they're just jealous! HAAAAAAAAAAAAAAAAAAAAAAAAAAA

 

Well, hes got piont about reliablity, mybe thats why honda decided to go kick start or they were smoking to much opium on the job.[img]i/expressions/face-icon-small-smile.gif[/img] But you shouldnt be calling ne one a idiot when you got that cool icon. Whats that called............ Up and to the left.

 

It is not the jetting at all every yfz I have seen has this problem. It is caused by the sensor in the thum throtle not releasing when you go to full throttle. it can be fixed by cleaning or by bipassing the thingall togather hope this helps.