?? are you dirt dragging or asphalt . and do you wish to use it as a daily rider or strict drag racer? the first thing i would do is to get a JET kit and rejet the carb to match the HMF exhaust . simply swapping the part does not add much if any power .
proper carb jetting with the pipe and open air box will add a few ponys .
.. a good dirt drag tire is the 22" 4 snows .... for a 400 ex .... at my old dirt track there was a guy running 5.5's on a mostly stock 400ex with the 4snow tires .
.the type of track you race on will change the ideal tire to run . also all the other variables come in to play like HP, torque ,Center of gravity, rider weight ....( so it is a guessing game)
.
race rules also apply ... most Real races do not allow Spiked tires but they are awesome for practice time and free play ..
.
weight reduction will make you quicker . rotating mass weight reduction helps even more as it frees up wasted HP . so if you dont need it . remove it . every ounce counts.
.
a alloy drag axle will make a big difference .. but cost is expensive . if u shop used ones you can save some $$ ( most are for Yamaha but fit honda style bearing carriers .) so a banshee , blaster ,or warrior drag axle will work . and uses a 400ex sized rear brake ass.) you will need to use banshee rear sprockets and rims . ( templates can be bought on ebay to redrill a new set of holes so your rims will fit both honda and Yamaha .) it is better to have the Yamaha 4/115 pattern hubs vs the honda 4/110 ones because most of the dragers run yamaha . this makes it easier to find used drag tires to buy or borrow . and save lots of cash .
.
cheap weight reduction can be as simple as removing the shocks and using pieces of pipe with holes drilled in them in place of the shocks . if you don't like the idea of no suspension then Marvin Shaw shocks is the way to go . the more expensive option is fox floats.
.
lowering the stance of the quad helps also... simply lower and level ... for dirt be sure to leave 3-4" of clearance so it does not bottom out when the track gets muddy or rough.
.
for light front tires think full buff scat tracks on dirt ... or buy a set of scooter tires and buff them yourself to save cash ( it is smelly and messy) and DWT rims are nice and light ....
.
a even lighter front end would be using spindle mount rims and removing all the front brake components. ( use caution and make sure you have room to stop using only rear brakes )
.
proper carb jetting with the pipe and open air box will add a few ponys .
.. a good dirt drag tire is the 22" 4 snows .... for a 400 ex .... at my old dirt track there was a guy running 5.5's on a mostly stock 400ex with the 4snow tires .
.the type of track you race on will change the ideal tire to run . also all the other variables come in to play like HP, torque ,Center of gravity, rider weight ....( so it is a guessing game)
.
race rules also apply ... most Real races do not allow Spiked tires but they are awesome for practice time and free play ..
.
weight reduction will make you quicker . rotating mass weight reduction helps even more as it frees up wasted HP . so if you dont need it . remove it . every ounce counts.
.
a alloy drag axle will make a big difference .. but cost is expensive . if u shop used ones you can save some $$ ( most are for Yamaha but fit honda style bearing carriers .) so a banshee , blaster ,or warrior drag axle will work . and uses a 400ex sized rear brake ass.) you will need to use banshee rear sprockets and rims . ( templates can be bought on ebay to redrill a new set of holes so your rims will fit both honda and Yamaha .) it is better to have the Yamaha 4/115 pattern hubs vs the honda 4/110 ones because most of the dragers run yamaha . this makes it easier to find used drag tires to buy or borrow . and save lots of cash .
.
cheap weight reduction can be as simple as removing the shocks and using pieces of pipe with holes drilled in them in place of the shocks . if you don't like the idea of no suspension then Marvin Shaw shocks is the way to go . the more expensive option is fox floats.
.
lowering the stance of the quad helps also... simply lower and level ... for dirt be sure to leave 3-4" of clearance so it does not bottom out when the track gets muddy or rough.
.
for light front tires think full buff scat tracks on dirt ... or buy a set of scooter tires and buff them yourself to save cash ( it is smelly and messy) and DWT rims are nice and light ....
.
a even lighter front end would be using spindle mount rims and removing all the front brake components. ( use caution and make sure you have room to stop using only rear brakes )
.
