right now i have an 11:1 102mm piston and a fmf muffler and header with a pro design air box set up and i am very pleased with the performance but i want to take it further and i would like some opinions on what others have noticed when going from what i have to a cam ,valves and valve springs and porting.i guess i am looking for some assurance that if i go with the cam and porting that it will make a big difference as compared to what i have now.right now even with my 260 lbs on my raptor i can usually take almost any banshee that is piped and i can take quite a few that are built even further, so what do you think/

 

well i think with that fmf pipe you get negative hp [img]i/expressions/face-icon-small-wink.gif[/img]

 

Changing the cam and piston is free power. The cost of cams is the same for small or large lift and pistons are the same price 11-1 or 12-1. It is worth the money.

 

dragraptor727- i guess that you must be assuming that because i have a fmf pipe and header and only a high comp piston that my quad is not very fast but i can tell you that i have raced a lot of fast quads and i never get left too far behind.what i am looking for is a good educated idea of possibly how much of a gain i might get by adding these mods.its always fun to race a quad that is built further than mine and beat them and i beat quite a few and the reason i can do so well is that i have messed with my jetting and gearing to suit the sand hill that i race on.its kind of frustrating to try to explain how fast my raptor is with just the mods i have but we have a lot of very fast four strokes around here and like i said i never get left too far behind.so does any body know of actual horsepower numbers that i might gain by stepping up to these mods? hopefully i dont sound like i have an attitude about my quad but i find that many of the quads that i race are built much further than mine but because of poor tuning and the wrong gear selection they dont do very well.as far as getting negative horsepower with the fmf what i actually get is a lot more torque than a pipe which builds more power at just the top end,my power comes on in the midrange where it is usable for racing up a dune so that is why it can perform well even although the peak numbers are not as high as some.as you can probably tell i am wanting to make sure that the gains i get will justify the trouble and expense so hopefully somebody has some dyno numbers to show the gains in real numbers.

 

im not saying ur quad isnt fast mate. i just heard a few bad things about fmf pipes on raptors, thats all

 

I have thought about going to a 727 Raptor. But I'll probaly wait till next summer.

 

you probably won't find anyone who has dyno numbers for each individual motor mod.

how much time and money do you want to spend? do you feel like pulling the head and jug??

throw in a new cam and you can still use pump gas with your piston.
play around with different pipes
remove airbox add dual air filters
extend your intake tract between the carbs and head
cut a few coils from your slide springs
lighten your piston
port and polish
add NOS
polish combustion chamber to mirror finish
go higher compression and race gas
go to alcohol and refill the tank all the time
go larger valves with ti springs
use coatings

call Robertson, Craycraft, Trinity, Sparks, etc.

 

dont forget that turbo....

 

A cam would be a quick mod.
maybe try a straight through pipe. does that FMF have multiple deflectors/tubes/chambers inside it???

 

i know that it is asking a lot to expect that someone had a break down of the horsepower numbers before and after the mods i listed but i thought i would give it a shot.BLUE LEADER- i am using the fmf set up because it is the only one i could find that meets our strict sound regulations here on the oregon dunes where i ride.the fmf does have deflectors and tubes in it ,were you thinking that i could modify it for a performance gain?i am willing to spend about another 1000.00 on the motor and i should be able to signifcantly up my overall horsepower if i spend my money on the right mods.i am hoping that a good port job and a cam will help but i could still spend more on something else i am just not sure where to go from there.i had thought about an ignition system but so far the reports i have read havent impressed me enough to warrant buying one.as it stands right now i have never lost by any more than two quad lengths to a four stroke up our comp hill which is only about 300 feet long so with the right modifications i should be able to hang in there with almost any four stroke that i run into.i have heard some very good things about( triple or double buff tires) although i am not sure exactly how they differ from my regular haulers so i might check into that further.building the motor on the raptor is a fun process but like anything else making the right choices and spending wisely will make all the difference.thanks for the ideas so far and i will take any more suggestions that any one has.