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4 Mill Best Engine Mods & Components


M.R.

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Hello,

   I'm building a 4mil stroker motor 795series piston motor. Looking for opinions on carb size and why 33 or 35 or 35 air strikers? Also need opinion on reed cages V Force 4 or ported/modified stock reed cages and what reed petals work good.  Cylinders are stock cylinders ported with raised intakes/ boyseen ports/ 28 mm exhaust port. Also have CPI inframe exhaust. I'm concerned with v-force reeds being all plastic cause I've also seen pictures of broken ones. Looking to ride this quad all around not looking to just drag race the quad. Cant seem to get any great solid answers from other shops I spoke to.  Does anyone have Dyno proven comparissons on these products on this forum here also. Thanks M.R.

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Reeds: If you get a sweet deal on used VF2's or 3's, grab them up. But if you are going to get new ones, go with the 4's. Nothing wrong with the material they are made from. They are fine on everything from mild trail bikes to full tilt drag bikes. However carbon fiber reed petals don't really agree with Nitrous oxide.

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carb's  35mm pwk's   air stryker or not  dosent really matter.  best thing with stryker's is the added vents out the top to stop them from overloading in whoops and jump's etc..  i'd prefer a set of 36/38mm lectron HV carbs due to the extremely easy set up and tuning.  but thats me  and i like simple...  the lectron HV carb in that size will perform on the bottom a lot like a 33mm pwk BUT have better top end power capacity i feel.   

 

if your budget allows get the v-4's.  replacement reeds for 2's and 3's are in the 100 buck range.  so rember that when your looking for used reeds....

 

the CPI's should be just fine for you.  if you want more power  consider a differnt top end..  

 

the biggest thing i  would suggest ( of course)  is a modified transmission.  if it wont shift  whats it matter if it has more power??  if you want  PM me and i can get you information on the trans that i do. 

 

and of course  all the other what i call "basic" engine build up stuff.   billet basket, hd clutch, bearing'd clutch pusher, true'd and welded crank and upgraded crank bearings.   and also possibly lightened flywheel, and ignition modifcations.  either DYNA or a billet timing plate.. 

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Cam is right on with everything but the lecs, lol.  Don't get me wrong, they are good carbs and Cam loves to tune them.  On the other hand, I hate to tune them.  I like my PWKs like Tyler said.  I run 35s and 39s.  Yes, the lecs have less adjustments with only screwing the metering rod in or out, and maybe enough time with a set and I'd like them too.  Just had better luck with the Keihins.

 

Did I see a timing plate on your list?  That is a must.

 

SP

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  • 9 months later...

Defenitly a good set of pipes. Cpi or shearer in frames, as stated custom.cut domes for ur setup and fuel, adjustable timing plate, vf4s, upp intakes, 35mm pwks pod filters. That's pretty much my stock cyld 4 mil setup. Runs good enuff for me. Once u've got all that figured out don't forget ur trans. Camatv does a reallllly nice pro mod trans, super easy to shift. Good billet basket and a clutch kit from jeff at FAST. Upgrade ur cooling system, billet impeller and oversized radiator. These will defenitly get u going. Theres plenty more power to be made after u get tired of this setup lol

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