my biggest disision i have to make on my quad

[250r/master3]

well i have an 89 250r and i want a lot more power even though it has a good amout. so i was reading about a powervalve cylinder and it is suppose to add about 15 hp, which is good but it cost about $1,300 or so. but also LRD makes a 300 resleave kit that adds 22hp that is for about the same price. i was wondering if i could get a powervalve cylinder and resleave it and would it be worth the money because that would be about $3,000. i dont want to get a big 310 or 350 cylinder kit.

[nacs400ex]

I think Powevalve is the only way to go if your getting a new cylinder. I just bought my R and I got an lrd265. It should be good.

[250r/master3]

but can you resleave it to a 300cc if you wanted to in the future

[hondafox440]

I can't imagine boring it to a 300 will nearly double the horsepower. Even with porting, polishing, carb, and a pipe +22HP seems a little far fetched.

[j37]

My opinion would be to get a CRF450 engine and an aftermarket frame that takes 250r parts. Thats just my opinion though. But if you really like 2 strokes id probably just get the powervalve cylinder.

[kicker696]

now to actually answer your question, yes you can bore it and have a power valve, you can get a power valve 350 cylinder for the 250r, now that would be very fast!!!

get a powervalve definetely

[Chef]

Originally posted by kicker696
now to actually answer your question, yes you can bore it and have a power valve, you can get a power valve 350 cylinder for the 250r, now that would be very fast!!!

They make 425 powervalve cylinders as well ;)

http://www.wildhare.rriders.com/hosted4don1.jpg

[310Rduner]

Originally posted by Chef
They make 425 powervalve cylinders as well ;)

http://www.wildhare.rriders.com/hosted4don1.jpg

He doesn't want a slow bike, Donnie, he wants a real one:rolleyes:





:blah:

check w/xanadad ,he maybe selling his ESR 265 powervalve cylinder..
he is hoping to get an even bigger one ,from what I understand

[310Rduner]

Originally posted by "2-R's Rider"
check w/xanadad ,he maybe selling his ESR 265 powervalve cylinder..
he is hoping to get an even bigger one ,from what I understand

bet he's looking for a 310PV :D

[lil400exman]

Originally posted by "2-R's Rider"
check w/xanadad ,he maybe selling his ESR 265 powervalve cylinder..
he is hoping to get an even bigger one ,from what I understand
i got first dibs on the pv!;)

[Narly R]

Get a LRD265 PV! Or a 330,350.....:devil: There 265 has a lot of power
:eek2:

If u get a bigger engine DEFENTLY a Power Vaulve!

[OCCRA288]

Originally posted by Chef
They make 425 powervalve cylinders as well ;)

http://www.wildhare.rriders.com/hosted4don1.jpg

Chef,





I HATE YOU!

[hondafox440]

You guys realize the powervalve only helps the low end to midrange power and torque in that range right? It really doen't add anything on top so the peak HP of a PV and non PV systems should be about the same.

[XANDADA]

LOL, PM me if your interested in an almost new ESR 265 powervalve ported for low end by Eddie. Aluminum sleeved Nikasil coated, billet head w/ O-rings, interchangable domes. I've put no more than 20 hours recreational use on it since I got it. I'm looking to step-up to an ESR 310-330PV this winter.

Even if your not interested in mine seriously look at a powervalved cylinder. Makes a huuge difference in the low-mid range. I can lug the heck out of it and it just keeps pulling where my old stock 265 would cut out and die. I'm even using a mid-top pipe (esr trx5) & 38mm carb and it still has plenty of low for woods riding & screams up top too.

[wilkin250r]

Originally posted by hondafox440
You guys realize the powervalve only helps the low end to midrange power and torque in that range right? It really doen't add anything on top so the peak HP of a PV and non PV systems should be about the same.



That's not necessarily true.

By changing the ports and pipe, you can change the powerband, and it's always a compromise. A high-rev port/pipe combination will give you lots of peak HP, but not much down low, a real "light switch" feel. A midrange port/pipe combo will give you a broader powerband, more useable and rideable, but less "peak" HP.

A powervalve won't give you more peak power, but it will give you more low-end and midrange power.

The reason I say your statement isn't necessarily true is because you if you want to race MX, or you want to ride trails, you need a midrange powerband, which means you sacrifice top end "peak" power. With a powervalve, you can port/pipe for more top-end performance, because the powervalve will give you the low-end that you need. In essence, you have the same low-end and midrange, but more top-end peak power.

[Glow Plug]

power valve for sure

[hondafox440]

Originally posted by wilkin250r
That's not necessarily true.

By changing the ports and pipe, you can change the powerband, and it's always a compromise. A high-rev port/pipe combination will give you lots of peak HP, but not much down low, a real "light switch" feel. A midrange port/pipe combo will give you a broader powerband, more useable and rideable, but less "peak" HP.

A powervalve won't give you more peak power, but it will give you more low-end and midrange power.

The reason I say your statement isn't necessarily true is because you if you want to race MX, or you want to ride trails, you need a midrange powerband, which means you sacrifice top end "peak" power. With a powervalve, you can port/pipe for more top-end performance, because the powervalve will give you the low-end that you need. In essence, you have the same low-end and midrange, but more top-end peak power.

True. What I meant (I wasn't clear enough), is if you put a 300R and a 300R PV, both identical except for the powervalve, they will have the same peak HP, however the low and an torque is greater on the PV, and you can sort of 'move' the entire power curve up on the PV.

[wilkin250r]

I have no doubt that you already know, I wasn't correcting you so much as I was posting the information for OTHER people that don't realize the full benifits of a powervalve. You can use the extra low-end and midrange to your benifit to give yourself more peak horsepower.

Originally posted by XANDADA
LOL, PM me if your interested in an almost new ESR 265 powervalve ported for low end by Eddie. Aluminum sleeved Nikasil coated, billet head w/ O-rings, interchangable domes. I've put no more than 20 hours recreational use on it since I got it. I'm looking to step-up to an ESR 310-330PV this winter.

Even if your not interested in mine seriously look at a powervalved cylinder. Makes a huuge difference in the low-mid range. I can lug the heck out of it and it just keeps pulling where my old stock 265 would cut out and die. I'm even using a mid-top pipe (esr trx5) & 38mm carb and it still has plenty of low for woods riding & screams up top too. :D ;)

[250r/master3]

so if i get a powervlave and resleave it to a 300 wouldint it be really fast. what about reliability