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hippy440
09-23-2003, 09:39 PM
how much hp did a stock 250r have?? i'm trying to compare with the new 4 strokes!!:D
310Rduner
09-23-2003, 10:28 PM
About 28

Pipe and air filter and you are looking at 35.
lil400exman
09-24-2003, 07:37 AM
Originally posted by 310Rduner
About 28

Pipe and air filter and you are looking at 35.
with reeds new carb and a port job well over 40hp........
09-24-2003, 07:47 AM
Originally posted by 310Rduner
About 28

Pipe and air filter and you are looking at 35.
with onl a pipe and air filter u get a gain of 7hp?
sickmojave
09-24-2003, 07:52 AM
Originally posted by fuZe
with onl a pipe and air filter u get a gain of 7hp?

that's one of the nice things about a 2 stroke.
XANDADA
09-24-2003, 08:01 AM
I think at the crank:
87 TRX250R
37.5 PS @ 7,500rpm (36.98 bhp)
3.75 kg-m @ 7,000rpm (27.14 ft-lbs)

Taken off of a Honda press release...
lil400exman
09-24-2003, 08:19 AM
Originally posted by XANDADA
I think at the crank:
87 TRX250R
37.5 PS @ 7,500rpm (36.98 bhp)
3.75 kg-m @ 7,000rpm (27.14 ft-lbs)

Taken off of a Honda press release...
thats stock and think about if you added 2000 dollars of engine mods guys.......see u cant beat the r!:devil:
wilkin250r
09-24-2003, 09:23 AM
Originally posted by fuZe
with onl a pipe and air filter u get a gain of 7hp?

2 strokes are different than 4 strokes in that respect. The only reason for a pipe in a 4 stroke is to provide a path for exhaust. Sure, the pipe has some effect, but not much. A 2 stroke relies on the pipe to help build compression and shape the power curve, so changes in the pipe and expansion chamber can make big differences in the power output. By changing the pipe, you can make the power come on low and smooth, but less peak power, or move all the power up into the powerband so that it has that true "light switch" feel to it.

A stock 250r is pretty mild, with a smooth easy powerband. Most aftermarket pipes will shift it so that you have more in one spot (more PEAK power) but less everywhere else.
nacs400ex
09-24-2003, 06:55 PM
So how much power do you think I will be pushing when I get this R together.

Its now a lrd270, mildly polished, 37mm carb, reeds, pipe, airfilter.. etc..


50hp ???
lil400exman
09-24-2003, 07:05 PM
Originally posted by nacs400ex
So how much power do you think I will be pushing when I get this R together.

Its now a lrd270, mildly polished, 37mm carb, reeds, pipe, airfilter.. etc..


50hp ???
close i bet around 49-52 hp.......depends on how lean and well tuned it is and what kinda port and more aggresive port will make more hp than a stock intake and exhaust port engine........;)
stepupmx
09-24-2003, 07:13 PM
Take it to a dyno.
nacs400ex
09-24-2003, 07:41 PM
I dont have it together yet. Its a winter project. The motor is done, just need the chassis all together
310Rduner
09-24-2003, 08:55 PM
Originally posted by nacs400ex
So how much power do you think I will be pushing when I get this R together.

Its now a lrd270, mildly polished, 37mm carb, reeds, pipe, airfilter.. etc..


50hp ???

I'd have to bet around 40-45hp...

Esr, and Ct 310 kits on the dyno make around 54 hp. Also keep in mind that they have a true displacement of 295cc's, not 310.
09-24-2003, 09:08 PM
pipe , port, carb, reed valve, filter u go around 45 hp id think
lil400exman
09-24-2003, 09:26 PM
either way thats alot of HP on a quad!;) :p
310Rduner
09-24-2003, 09:36 PM
Originally posted by lil400exman
either way thats alot of HP on a quad!;) :p

but not enough...;)
lil400exman
09-24-2003, 09:38 PM
Originally posted by 310Rduner
but not enough...;)
lol say that after u wrap urself around a tree :( lol thats why i sold my bikes lol just too much power and the r feels the same way........:eek: :cool:
310Rduner
09-24-2003, 09:40 PM
Originally posted by lil400exman
lol say that after u wrap urself around a tree :( lol thats why i sold my bikes lol just too much power and the r feels the same way........:eek: :cool:

No tree's to get in my way really.. just dune buggie's:eek: ;)

I've probably got around 55hp right now, and I'm thinking about how I can budget a stroked 350 (+4mm) into my chassis buying budget.:macho
XANDADA
09-25-2003, 07:24 AM
Originally posted by 310Rduner
but not enough...;)

never is!:devil:

ESR told me that with my 265 pv & intake/exhaust setup I was around 48. Dang I wish I had went with that 330 pv now:(
cody anderson
09-25-2003, 08:37 AM
I sure hope that you guys are tal;kingabout HP from the crank because there is no way that you have 48-52 HP to the wheel with a 250R or even a 270. I WHEEL dyno'ed my PSI 265 and my Sparks 265 and the PSI had 41 to the wheel and my Sparks had 39. I dyno'ed my stock yfz450 (cept the cam and pipe) 3 weeks ago and it had 46 or 47. I can't wait till the motor is done! Two strokes are going down hill dudes... I wish they weren't either... I love two strokes, but the four strokes are just getting faster and lighter.
XANDADA
09-25-2003, 08:54 AM
I assumed they were talking rwhp, but dunno honestly. I want to take it down to ecatv to have it dyno tuned this winter after a fresh rebuild/break in. Just a piped R will get 35rwhp so 48 with all the mods I got don't sound too far off but maybe a little. I would be very surprised if I wasn't at least 44 or so. But like stated earlier, never enough no matter what the real # is...

265 ESR PV'd, Nik'd & ported cylinder
cr250 modified piston
high comp dome
trx5 pipe
open airbox
cr250r reed assembly
38tmx carb
cody anderson
09-25-2003, 09:09 AM
I promiss it wont be 48. If it is I will... buy you lunch or something. I had everything you could to a 250R on mine and I could't get 48.:rolleyes:
nacs400ex
09-25-2003, 01:49 PM
yeah, I guess. It sure will be a lot more than my stock motor 400ex. I cant imagine what a 350 PV would be like. There is a guy that I ride with that has one. Maybe I ask him if I can ride it at the track :eek2: .
lil400exman
09-25-2003, 01:57 PM
isnt cody anderson getting paid by yamaha and also a paid yamaha test tider?? if he is i wonder why the yfz has so much hp?:rolleyes: ;) lol its weird what money does to some people..........:p
09-25-2003, 03:12 PM
I have talked w /a pro racer had a 350PV motor &he have said it is almost uncontrollable for most woods & recreational riding ..
09-25-2003, 03:21 PM
wuts the powervalve do? or is it just a name for ESR or wut? is it anything special? and wuts with the PSI? wut is it..which one is better?
lil400exman
09-25-2003, 03:57 PM
Originally posted by fuZe
wuts the powervalve do? or is it just a name for ESR or wut? is it anything special? and wuts with the PSI? wut is it..which one is better?
ESR and PSI and both engine builders;) a powervalve is a mechanisim that makes your exhaust port bigger and smaller for more going in and out of the rpm range it makes power e power band come on quicker and get off later. its a very nice thing to have but its expensive and you can only get them in aftermarket cylinders........:D
Guy400
09-25-2003, 04:03 PM
Originally posted by lil400exman
its a very nice thing to have but its expensive and you can only get them in aftermarket cylinders........:D Or if you own a 1987+ LT250R or 500R:D
09-25-2003, 04:05 PM
Originally posted by lil400exman
its a very nice thing to have but its expensive and you can only get them in aftermarket cylinders........:D
worth every dime :D
VIC
09-25-2003, 05:11 PM
Originally posted by Guy400
Or if you own a 1987+ LT250R or 500R:D
I believe the tecates had them also called them KIPS
nacs400ex
09-25-2003, 07:07 PM
yeah, But the crappy thing is a cr250 will still beat a 350PV. Oh well. The guy I know that has one cant keep the front wheels down on the TT track. He loves it for MX though. His R is a total Hermman chassis with Elkas. Its an awesome bike, but he just blew his rear shock out. :(
310Rduner
09-25-2003, 07:32 PM
Originally posted by cody anderson
I promiss it wont be 48. If it is I will... buy you lunch or something. I had everything you could to a 250R on mine and I could't get 48.:rolleyes:

Which bike are you reffering to? a 310 cylinder (295cc's stock bore) or a 270? I have no doubt in the ability of a piped, ported 295 to make 50 rwhp if your 265 is putting out 41 rwhp? Even if the 50 range is at the crank ( i doubt it) then it would still have at least 45-47 at the wheels.

Those yz's must really uncork with a pipe and cam @ 45 rwhp.. when stock is only 35.:confused:

I think a hop over to macdizzy's will reveal the answer, and I believe that answer will be for the 54rwhp range.:)
310Rduner
09-25-2003, 07:36 PM
Originally posted by cody anderson
I sure hope that you guys are tal;kingabout HP from the crank because there is no way that you have 48-52 HP to the wheel with a 250R or even a 270. I WHEEL dyno'ed my PSI 265 and my Sparks 265 and the PSI had 41 to the wheel and my Sparks had 39. I dyno'ed my stock yfz450 (cept the cam and pipe) 3 weeks ago and it had 46 or 47. I can't wait till the motor is done! Two strokes are going down hill dudes... I wish they weren't either... I love two strokes, but the four strokes are just getting faster and lighter.

To add to my previous post... : maybe Esr just builds em better:devil:
Chef
09-25-2003, 07:41 PM
Originally posted by 310Rduner
To add to my previous post... : maybe Esr just builds em better:devil:

I dont think so man...:blah:
09-26-2003, 06:04 AM
my ESR works fine for me :D ,very happy with it
XANDADA
09-26-2003, 06:15 AM
who let 2r's back in here:confused: :cuss:









:macho ;)
09-26-2003, 06:17 AM
I'll never tell ;) :D
jcv400ex
09-26-2003, 06:19 AM
Originally posted by XANDADA
who let 2r's back in here:confused: :cuss:
:macho ;)


yeah, really!? :D
XANDADA
09-26-2003, 06:27 AM
Originally posted by cody anderson
I promiss it wont be 48. If it is I will... buy you lunch or something. I had everything you could to a 250R on mine and I could't get 48.:rolleyes:

Dizzy got an '86 dyno'd at 53.3 rwhp, why couldn't mine be at 48? I'm sure its set-up for all top end drag though...
link = 1986 "Dizzified" trx250r dyno (http://www.macdizzy.com/trx_dyno.htm)
310Rduner
09-26-2003, 05:24 PM
Originally posted by XANDADA
Dizzy got an '86 dyno'd at 53.3 rwhp, why couldn't mine be at 48? I'm sure its set-up for all top end drag though...
link = 1986 "Dizzified" trx250r dyno (http://www.macdizzy.com/trx_dyno.htm)

I've always liked that dyno:D

Anyone want to note that the cc's are still only around 250..:devil:

53.3rwhp at 215lbs of compression, 49.7 at 165.lbs compression.
Not even in our 72-73 range xanada.

Hp is all in the hands of the builder,and his skill at porting/tuning. Not what parts you bolt up to it as accessories.
SpeedBump
09-26-2003, 05:56 PM
Originally posted by VIC
I believe the tecates had them also called them KIPS The KXF250 (87-88) both had powervalved engines. The also have counterbalancers. The engines that REALLY rip are the KXT250s. That is the trike engine. The early ones didn't have a powervalve, but the 86-87 did. The difference between the KXF and KFT engines was the lack of a counterbalancer on the KXT. They vibrated a good bit more, but also made more HP... who cares about a BIT O' SHAKE!!!!!:devil:
310Rduner
09-26-2003, 06:02 PM
Originally posted by SpeedBump
The KXF250 (87-88) both had powervalved engines. The also have counterbalancers. The engines that REALLY rip are the KXT250s. That is the trike engine. The early ones didn't have a powervalve, but the 86-87 did. The difference between the KXF and KFT engines was the lack of a counterbalancer on the KXT. They vibrated a good bit more, but also made more HP... who cares about a BIT O' SHAKE!!!!!:devil:

Anyone who rides more than 30 mins at a time.:)

Why worry about any of this, buy the R, and buy a big bore.:D
Only way to go man.