Powervalve

[wilkin250r]

I'm looking to get a powervalve for my 250r. I've seen 250PV, 265PV, and 350PV.

The 350PV requires case machining to fit the bigger sleeve. Does anybody make 310PV I'd get maximum displacement without the expense of machining the cases?

The only powevalve kits I've seen are CTracing and LRD. Any others?

[XANDADA]

ESR has 265, 310 & 330's that don't require case machining. Unfortunately the 310's with PV's are a minimum of a six month wait. On the 330 PV I think the '86 requires case machining but the on the '87-89 it is a bolt on.

[ieatglue]

the 330pv from esr does not require any case machining on any year of R motor. it does require a long rod to be installed in the 85-86 motors though.

[wilkin250r]

I'm not too big on 330 bolt-on kits. From what I understand, it SHOULD require case machining, but they just cut the sleeve short so it bolts on. I'm not sure I feel comfortable with that.

So, what's involved in converting my 86 to a long rod? Am I going to need to pull the crank out? If I need to do that, I may as well machine the cases while I'm at it.

Why isn't the 310PV kit on the ESR website?

[ieatglue]

yes, you will have to pull your crank out. the 85-86 motors have a rod that is approx. 4mm shorter than the 87-89 motors.

i agree with you on the 330 bolt ons. i don't care much for them also.

[wilkin250r]

Are there any 310 kits that DON'T require me to convert to a long rod?

[310ESR]

ESR 310 PV does not require case machining, long or short rod. I'm going to Eddie's tomorrow and I'll ask Darin what the lead time and get back

[CBW]

Originally posted by wilkin250r
Are there any 310 kits that DON'T require me to convert to a long rod?


I put a 310 kit on my 88 R (although its not a PV) and it was from ESR and i believe that if you put one on an 86 you just dont use the spacer plate like on the later years. But i am not 100% on that.

[wilkin250r]

Originally posted by 310ESR
ESR 310 PV does not require case machining, long or short rod. I'm going to Eddie's tomorrow and I'll ask Darin what the lead time and get back

Yes, please keep me posted. It is obviously going to be alot cheaper for me if I don't have to upgrade to a long rod. I'd rather spend that extra money on suspension.

[airheadedduner]

Originally posted by sponge_bob
yes, you will have to pull your crank out. the 85-86 motors have a rod that is approx. 4mm shorter than the 87-89 motors.

i agree with you on the 330 bolt ons. i don't care much for them also.

I thought it was 2mm. like 125.3mm for 86' and 127.3 for 87' and up.

If you go to the long rod witht he 86' piston I think you need a spacer plate too. I don't see why any kit would require a long rod. By useing the different piston/rod combinations it seems like you should be able to come up with a setup that would fit.

[wilkin250r]

Originally posted by airheadedduner
I thought it was 2mm. like 125.3mm for 86' and 127.3 for 87' and up.

If you go to the long rod witht he 86' piston I think you need a spacer plate too. I don't see why any kit would require a long rod. By useing the different piston/rod combinations it seems like you should be able to come up with a setup that would fit.

I'm not an expert (yet) on the detailed specs. I figure, though, that the rod, piston, and cylinder are designed to go together. Why would you ever convert to a long rod, and use the same piston and cylinder, with a spacer plate?

[Chanman420q]

lol have fun kicking those 310, 330R's over better get foot insurance :p

[ieatglue]

the bolt on 330 from esr does require a long rod


the reason people run a long rod with spacer plates is to give more low end power. it makes the piston stay at top dead center just a little longer therefore giving more low end.

[wilkin250r]

Originally posted by Chanman420q
lol have fun kicking those 310, 330R's over better get foot insurance :p

Kicking, yes. Kicking A** on the hill AND the track. :muscle:

[310ESR]

I was @ ESR today and Eddie said a 310PV barrel is backordered and will be in next week and be ready at the end of the week or following week. The rod is 4mm longer in all 87-89 engines. If you run a long rod in a 86 you will need a spacer plate if you run a stock piston. The long rod will make more torque and a short rod will make more top end, because the piston will stay at the top and bottom of the stroke longer.

[310ESR]

hey 250r riders the creators of ex riders also r riders
check it out

I have a ESR 310 PV ..set up w/a short rod ..& ported for bottom /mid ...the power seems to be very broad this way

[XANDADA]

Originally posted by 310ESR
I was @ ESR today and Eddie said a 310PV barrel is backordered and will be in next week and be ready at the end of the week or following week.

WTFH! That had better not be true. I have been on waiting list for a 310 pv since second week in January. Darren told me two weeks ago that it will be at least until July/August when they get them in from LA sleeve. I couldn't wait that long and settled for a 265 pv which just arrived at my house a few days ago. I may have to call darren and do a little venting... maybe he'll let me send it back. :mad:

[wilkin250r]

Originally posted by 310ESR
I was @ ESR today and Eddie said a 310PV barrel is backordered and will be in next week and be ready at the end of the week or following week. The rod is 4mm longer in all 87-89 engines. If you run a long rod in a 86 you will need a spacer plate if you run a stock piston. The long rod will make more torque and a short rod will make more top end, because the piston will stay at the top and bottom of the stroke longer.

The answer seems obvious, but I want to make sure.

If I'm running the short (86 length) rod then I will not need a spacer plate, and it is a bolt-on kit?

correct!:D ...I have no spacer plate ;) on mine

[400MXer]

Duncan had A powervalve, it's either a 305 or 310. It's the PC2000. Baldwin advertised a powervalve on his webpage. Sparks has a powervalve too but i'm sure the wait for a sparks one it LOOOOONNNNGGGG.

[wilkin250r]

From what I saw of the Sparks kit, the 305 required case machining. I thought you could go up to 310 without casework?

the ESR 310 does not require case machining

:D bolts to original cylinder studs spots w/new longer ones & no spacer ..see?:huh

[wilkin250r]

I like to have a little information before I call them.

What's the price? Should I upgrade my stock carb? I figure I can probably get the 310PV and shocks at the same time, but I can't get the shocks if I need to upgrade my carb.

Yes you will need to upgrade the carb,..& reeds if your are stock .
the price is over 1k closer to 1.5 & ..I know there prices have changed since I got it ..

[wilkin250r]

Got any HP numbers on it? How much improvement will I see?