View Full Version : drag racing

08-14-2010, 04:01 PM
is there any dirt atv drag racing goes on any where near greeneville tn. i love dragging my 500 predator but we only have like 1 drag race a year around here at the county fair i would like to find other places not to awful far from here to drag and make new friends with and have fun...... :)

08-14-2010, 04:18 PM
try atvdragracers.com or try doing a few web searchs for your area?

08-14-2010, 09:01 PM
i have a ? on jetting a 05 450r carb on a 400ex stock bore i have a full exaust procom cdi box and a webb cam degreed 7 degrees i have a 48 pilot 190 main and a/f 2-1/2 out needle is set 2 notches down from top it runs strong on top end and mid but when i rev it up and let off it pops and cracks out the exaust i put a 50 pilot in it but it seems a little big any suggestions will be helpfull from you guys that have done this

08-15-2010, 03:23 PM
make sure you dont have a air leak on the carb or the exhuast.

08-15-2010, 08:54 PM
do you think the 450r carb is too much for a stock bore

08-15-2010, 09:09 PM
i dont think so. i would try the jeting and moving the clip.

it's trial and error. does it run good over all with the jets that are in it now ? what is it doing other then poping ?

08-15-2010, 09:25 PM
other than the poping and cracking it seams to runs great but when it gets hot it lightly spits back through the carb does that mean the pilot is too small

08-15-2010, 10:21 PM
Not that close got so good drags in va, west va.newtown.com at the end of year is pretty good.

08-16-2010, 07:39 AM
the spiting back sounds like timming or valves not setting right. but you can try a 42 and see what that does for you. i have a 450 carb on mine. but it's the 06 and up fcr carb. it's a lil bit diffrent and bigger. but if you get with johndoe83 he has that same carb on his. i have not seen him on here for a day or two.
theres been alot of bs going on with the hole drag racing thing.

08-16-2010, 09:11 PM
NOOO!! your carb is still lean or youve done something wrong on install, like have a air leak....hotstart maybe?

backfiring on decell is a lean condition of the pilot jet, you can go up to 3.5 turns out on the air/ fuel screw before you need a bigger pilot jet.

MY jetting thread.


11-21-2010, 08:52 PM
another site you can check out is planetsand.com

there alot of good sand drags down your way.