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View Full Version : 250r guru performance help...........


weed
11-29-2006, 10:57 AM
ok, its time i get my 86 R faster.

heres the mods

port n polish
boyseen reeds
FMF fatty pipe and silencer
its on a new piston/sleeve. stock bore

i will eventually do some mods like the 310 kit, cr ignition, somewhere down that line. but i will study this area more..

the two things im lookin at now to get faster after i eliminate my airbox.

1. What carb should i go with. and what jet size (roughly)??????????
2. what sprockets???????????

all i will be doing with this bike is basically taking it to the beach and drag racing. i wont be trail riding, or riding short track or anything like that.


thanks fella's:pics:
weed
11-29-2006, 02:47 PM
dang , 21 looks and no replies~~~~~~~~~~~~
thefox
11-29-2006, 04:01 PM
dang , 21 looks and no replies~~~~~~~~~~~~

Sure, a lot of 4 stroke guys like me are just curious about what you 2-smokers are up too. :beer
BigGreenMachine
11-29-2006, 04:31 PM
Search and look for a post by Dammit about his Airstryker carb.

Sprockets depend how far you race. Shorter gearing for a short sprint and tall gearing for winding it out.

You may want to look into a CR ignition for faster acceleration and maybe a better pipe then the FMF.
Pete
11-29-2006, 08:10 PM
I would update to a RAD Valve or a Vforce reed cage, along with either PT high rev pipe or the ESR ATC5, along with a CR ignition from ESR.
Yamahondaman
11-29-2006, 08:20 PM
I Agree ............ Paul Turner High Rev But them Rad,Ram, V-Force Thing's...NOPE !
Re-Sleeves NEVER Run like the Stock Stuff !!!
Billy Golightly
11-29-2006, 08:27 PM
If your gonna be mostly running on the beach which I'm guessing is pretty wide open you can run the 39mm PWK carb available from ESR Racing. They come prejetted and also with an assortment of main jets if you need to dial it in a little closer yourself.

Gearing, Id say something like 14/38 or 15/40 if your gonna be doing some higher speed stuff. After you work it over some more you could go a little taller to pull extra gearing like 15/38 or 15/36
gravelord
11-29-2006, 09:05 PM
38mm air stryker carbs are great.
BigGreenMachine
11-29-2006, 09:21 PM
Ronnie, why not the Vforce/Rad Valve systems?
Pete
11-29-2006, 09:29 PM
I myself like the Rad Valve from a CR. The V Force's tend to eat reeds a little bit.
weed
11-30-2006, 06:44 PM
Search and look for a post by Dammit about his Airstryker carb.

Sprockets depend how far you race. Shorter gearing for a short sprint and tall gearing for winding it out.

You may want to look into a CR ignition for faster acceleration and maybe a better pipe then the FMF.

from the looks of it most people are stayin away from the airstrykers and staying with the regular 38mm pwk non-airstryker

once i figure out what carb then i'll order my bigger reed cage assembly and then the airbox eleminator kit:w00t: :w00t:
BigGreenMachine
11-30-2006, 08:25 PM
KX500's have a 39mm PWK if you want to ebay a used one.