Does anyone know if a 310 will keep up w/ a 450 easy

[chris46]

i was wondering if i should get a 310 to stay ahead of every one

[beerock]

well if you really want to stay ahead of everyone(cus you can ride that good) ;) get a nice 330 only highly modded banshees will keep up

[chris46]

yeah, first race i got caught up in the first turn and was in dead last and ended up passing 9 guys in first lap in a half and was in 3rd and had a lil trouble getting around a 450 , whats teh difference between a pv310 and pv 330

[beerock]

imho 330 and higher dont need a pv

difference? 20 cc's

[chris46]

yeah , the difference of 20cc was a givin but is there a price difference and is esr a good p lace to get it

[beerock]

esr pv are nice but if you get a 330 you dont need it IMHO

and im not sure esr will sell there cylinders without port work(if you get a 330)

best way to do it, is get a 330 thats not ported(if esr will do it go for it) esr's port work is not very good IMHO and has a lightswitch like powerband not really nice.

if you go 330 you will need your cases machined but you only need to do it once.

also if your thinking about putting a big bore on you should think about buying a new crank and main bearings to start out fresh(while your putting in the new crank have the cases machined for a 330 or higher(for later use have it bored to 350) so you dont have to do itlater on, just buy a 350cyl.

[chris46]

yeah, i have 2 engines, one only has 2 hrs on it and never been used except 1 race and 1 practice so im gonna rebuild that and i was just wondering what i should get for it

[250r4life]

the difference between the 310 and 330 is the 330 will have more bottom end, will rev a little slower and not wind out as good... sounds like you are doing motocross, and that depends mostly on rider and suspension... as far as plain bike ability, i have a duncan 265 pv (actually a 262... ive got the 68.25 wiseco racers choice piston) that has had some good porting and polishing done on it, and a 36 pwk, and there arent yfzs without motor work that are smoking me... with a 310 you should be more than fine. IMO opinion i would not go over a 310, as you start chaging the way it revs and feels and going more low end, and puts more strain on the bottom end and clutch and... JMO...
some guys like the bigger bores... im a smaller guy and like reving the piss out of it and love it revving to the moon, so i prefer to stay with a smaller bore...

[beerock]

you say that now but when you get a big bore you wont go back.

[jon370r]

I bought my 350PV kit from ESR completely unported and it cost me $1299.00, thats $200 off. I'm having R.E.D. (Richards Engine Development) do the portwork. He has done work for me before and I was very happy with the outcome. He has a 6 month backlog of work though.

[250r4life]

Originally posted by beerock
you say that now but when you get a big bore you wont go back.


:D lol... maybe so... i dont plan on ever getting anything bigger than a 310... i personally like my 265 right now, cuz my good riding buddy have a nice 06 yfz450 and right now he and i have some killer races.. he is a dang good rider and been going to the dunes for almost 20 years... we shoot the hill at the dunes a bunch, and its great cuz right now we trade off and its whoever has a good run... we have an agreemant too that we wont mod anything further, cuz then the other will have to cuz if not our races would be one sided...

[matt250r21]

250R4life do you have a part # for the 68.25 wiseco piston you are useing. Thanks.

[250r4life]

yah, i've got it at the house...
as far as i know the racers choice piston only comes in 68.25 & 68.5. just curious- why do you ask?

[chris46]

yeah , i race motocross and i got custom axis shocks and i just want more power ,..... so you think a pv 310 will be good cause a couple people say you shouldnt need 310 or higher for mx

[TampaBoy813]

My brother just got a 2006 CRF450x and we raced on the ct350 non PV and I won every time.....

[chris46]

crf450 dirtbike or quad ?

[beerock]

the problem with the small 265 is you have to rev them high to stay n the power band with a insane port job even if it has bottm and mid thats just how the 265's make power

the 310 and 330 are actually mroe fuel effiecient for the same speed your going on a bike IE a gear higher still lots of power

[250r4life]

yah i can beleive that they would be more efficient... my bike now is more efficient than when it was stock...

yep, with a 265 you do have to stay on it and rev it out to have power... whats wrong with that? its a 2 stroke, its a 250r, thats the way its supposed to be... if i wanted the low end and wanted to be able to lug it, i would have boughten a 4 stroke... thats what i love about the 250r, riding the piss out of it and having to keep it in the powerband- lots of shifting and clutch action...

you old guys are gettin soft in your old age...

:D

[beerock]

nah just smarter. and lemem tell you, i hold my 330 wot alot its just a bonus to have the bottom end.

i doubt youll be doing any 3rd gear launches with a 265 ;)

dont get me wrong i love revving the piss out of the motor its great, but efficency is lower on a 265 then say a 310 or 330 also stressing of the parts also is lowered depending on how you ride the big bore.

i have had lengthy discussions with doc bones over this and also we have compared both our gas tanks when we have had hour MOTHER LOAD 8 hour riding days, and docs big bore always had mroe gas in it then compared to my 265. its also my style of riding that sucks myu gas down faster(i slow down so i can speed up faster then the front guy.


there just preference thats all. but dont go over the line and talk about us bein old folk you little FART ;P maybe one day us old folk will open a can of eat my dirt hehehe ;P

[250r4life]

ha ha... yah its too bad you couldnt make the trip out to glamis this year with doc and what not... course, i couldnt either... i would have, but i was in brazil at the time... maybe i'll catch up with you old farts next year :D

i dunno if i could do a 3rd gear launch on my bike. i have always done it in 2nd, and shift to 3rd like a second later...

and yah, like i said, i beleive the efficiency is better... a more powerful engine does not have to work as hard to do the same thing...

yah, when i ride in a slower group i do the same slow to speed up thing... the good thing is at least 1 a dune trip, my buddy joey on his yfz and i just go off us two, and its just balls to the wall.. no need to slow down cuz were just screamin the whole time...

and yah, i'm a little fart @ 24, so i only have a few more years before i join you old farts, so i gotta take advantage of being able to joke with you guys bout being old while i still can.. course, my body is feeling a lot older than i am... i wrecked on my bike about 3 weeks ago, and i dont ever remeber hurting for this long... body just dont heal as quick as it used to :D

[TampaBoy813]

Originally posted by chris46
crf450 dirtbike or quad ? dirtbike

[matt250r21]

250r4life I have never seen a racers choice Wiseco, just interested in what it is. Is it a YZ 250 style piston? Is there anything special about it compared to a regular Wiseco? Thanks.

[Scott270R]

Originally posted by beerock
you say that now but when you get a big bore you wont go back.

Amen Beerock, I LOVE my ESR330 non PV. It will kill any 250 regardless of mods.

[matt250r21]

Just curious guys, how do you think your big bores would compare to a pro's 265 PV? Lets say J Jones Sparks 265 PV, vs a 350 PV that anyone could buy from any of the big name builders.

[Scott270R]

Well probably the pros would be faster, but It might be because he's on it.

[matt250r21]

That is not what I mean, I'm interested in how the motors would compare to each other. J Jones could beat most anybody on any bike.

[Scott270R]

There is nothing that can be done portingwise to a 265 Engine verses engine to outrun a good port job on a 330. The bigger piston just pumps the air better and builds up torque and hooks up better.

What I mean is for the same output of peak power generating it at a lower RPM will always hook up better and be faster. Plus a taller gear will launch harder and outrun a 265 with better torque.

[chris46]

i think i might buy a lonestar 250r frame and put a crf 450 engine in it and put my 250r parts from the stock frame to the lonestar frame...?? think that would work

[250r4life]

Originally posted by matt250r21
250r4life I have never seen a racers choice Wiseco, just interested in what it is. Is it a YZ 250 style piston? Is there anything special about it compared to a regular Wiseco? Thanks.


the part number is 832M06800
um, im trying to remember what was different...
is lighter than normal, its got some coating on it, and there was something else... i think having to do with the gas ports or something...

[250r4life]

i never said that a 265 was faster than a 330 or even that a 310 was... but personally i would prefer a 310 over a 330...