Hi i was wounding if someone could help me on gearing on my 660 raptor. Im going to run 275ft dirt atv drags. it has satge 1 hot cam. stage 3 dg full pipe, drag clutch with 25% stiffer springs i am planing on running 18X10X9 tires i raced there last year and could only get 2nd gear almost 3rd when it was other and i was catching them i was thinkg useing a 11t in the front and 40t in the back what u think? any help would be nice thanks

 

Do you plan on taking off in second gear??? 11f X 40r X 18" seems really low

 

I dont really care what gear to start out in i have no probelm missing gears or anything I was told to go to to teeth smaller in the front and leave the back stock stock gears are 13f/40r but I like to also drop a tire size if I can like i said its only 275 ft drags and could'nt get out 2nd

 

From a old drag racer,

Gearing is hard to predict in your situation. If you knew the rpm you engine was at at the finish line you could calculate where you need to start.
In your case you will have to buy say a 9 and 11 for the front and perhaps a 42 for the rear.

You presently have a 3.08 to 1 reduction in gears
11/40 would give you 3.66 to 1
9/40 would give you 4.44
11/42 = 3.82
9/42= 4.67

Then pick what you want to try first and go test it on a 275ft track
Depending on the dirt and therefore the traction available you may still find something that works good at home or in todays air is still not bang on at the race

Also please don't double post the same topic.