Well here is the age old question?

[fmf400ex]

Race season is coming up in a little over a month. And I was wondering what are some good power gaining mods i could do for under $100. Like maybe gearing it diff. something like that if. If so what is a good gearing set up. I have 21" front tires and 20" rear. And any other options would be appreciated. Thanks in advance.

for around 160 you can do a 416 with a higher compression piston

[roostu]

Well here is a tip that is FREE!!!!!!!!!!!!

I know that jetting isn’t as big a deal on 4-strokes as 2-strokes but getting you’re jetting down will give you that little edge over the other guy.

~Roost-U

[YZROOSTINYA]

pull the choke from the carb, grind the welds in the header. practice leaving the gate. practice ALOT at the track your racing at. practice braking. just keep practicing

[fmf400ex]

Yes that is true, I am starting practice on the track this saturday. And yes MX#132 I would love to put a 416 in, but wouldnt it be another couple hundred bucks to get it installed. Also should I try a different gear ratio. I am racing mx and some trail riding.

[ATVEXTREME00]

ok sorry this is a little off topic but whats the deal with taking the choke off i havent really heard of such a thing so im curious

[YZROOSTINYA]

the choke yakes up space in the carb so people remove it to increase air flow


u richen up your pilot jet froma 38 to a 42 and it pretty much takes the place of the choke.

i did not dyno before or after so i really dont know how much of a diff it made. my quad starts easier now so it doesn't matter.

plus i get to tell people how cool i am since i dont have a choke. i am soo badazzz