pwk over rev?

iggys-amsoil · Post by **iggys-amsoil** » June 28th, 2008, 2:27 pm

AlisoBob wrote:I'd plug it ..... Get the bike running sweet first, then dick around with it later...

X2

Dude your gona have so much crap to deal with, this is only adding to it.

100hp honda · Post by **100hp honda** » June 28th, 2008, 2:56 pm

let me ask something here- the powerjet is used for methanol and nitro for the purpose of adding more fuel, because the main jet cant supply enough. you guys are using real small mains, with a powerjet= which equals the same as one large main ? were talking gasoline, on aspirated engine. if we were talking a supercharger that compresses things then it would be a different story. but with gasoline on a carbureted motor, only so much gas can be put into the cylinder at any given time, without over fueling it. a regular carb is more than suficient at putting plenty of "burnable" fuel in there

. ever tried a 200 main???? it will choke the shit out of MOST cr500 motors

100main with 3 powerjets 1/4 open

145main with 1 powerjets 3/4 open

200main with 0 powerjets

you CANT magically put more fuel in there with 1000 powerjets and make it run any better

dannygraves · Post by **dannygraves** » June 28th, 2008, 4:11 pm

you get wicked throttle responce by running a lean main and while WFO a vacuum is slowly created between the slide and airbox, this is when the powerjet kicks in, as more vacuum is created, the velocity of the fuel coming from both the main and power jet increases.
Powerjets were first used in late '70's snow mobiles to keep them from going lean while sustaining long periods of WOT. these were cast into the carbs and used for GAS, not alcohol.
DeWayne told me it was one of the tricks that makes his SM bike super fast, when he holds it wide open fuel keeps coming instead of leaning out. He suggested it for my buildup since I use the bike for sand drags.

aloha450x · Post by **aloha450x** » June 28th, 2008, 4:16 pm

well ill just turn it off until I get shit figured out.

4Z · Post by 4Z » June 28th, 2008, 9:16 pm

Looks like the 39.5 that came on the 97-99 Polaris 700cc twin cyl snowmobiles. The powerjet is/was made by PSI. The PSI powerjet is a nice adjustable jet. Bulky compared to the Clippard, but a quality jet.

I put one of these carbs on my 84. Had to turn down the the OD of the inlet so the airbox boot would fit.

aloha450x · Post by **aloha450x** » June 29th, 2008, 1:32 pm

yo 4z did ya sell that carb on ebay? mine was turned down as well

aloha450x · Post by **aloha450x** » June 30th, 2008, 12:00 am

ok i dropped a 145 in there and turned it out 3 turns. so danny what you are saying is that when i go wfo it should bog for a sec that run like a scolded dog. so i take away fuel by turning the knob clockwise until the bog goes away correct.

Post by **AlisoBob** » June 30th, 2008, 6:15 am

I would go ahead and order a piston kit now....

4Z · Post by 4Z » June 30th, 2008, 6:16 am

aloha450x wrote:yo 4z did ya sell that carb on ebay? mine was turned down as well

No sir, I still have it. But I run the Clippard powerjet like Packard does on the Lectrons.

dannygraves · Post by **dannygraves** » June 30th, 2008, 7:01 am

aloha450x wrote:ok i dropped a 145 in there and turned it out 3 turns. so danny what you are saying is that when i go wfo it should bog for a sec that run like a scolded dog. so i take away fuel by turning the knob clockwise until the bog goes away correct.

IF your gonna use it, open it way up, so it blubbers, then keep cranking it in until it stops blubbering. but this is all at WOT

if tuned right it should be a very smooth transition, it should rip right when you open it, then keep pulling.

100hp honda · Post by **100hp honda** » June 30th, 2008, 7:02 am

AlisoBob wrote:I would go ahead and order a piston kit now....

yep

britincali · Post by **britincali** » June 30th, 2008, 10:22 am

100hp honda wrote:
AlisoBob wrote:I would go ahead and order a piston kit now....

yep

+2 !!!!!!!!!!!!!!!

dannygraves · Post by **dannygraves** » June 30th, 2008, 10:36 am

you guys have no sense of adventure!

aloha450x · Post by **aloha450x** » June 30th, 2008, 12:02 pm

hey danny who is this DeWayne guy?

4Z · Post by 4Z » June 30th, 2008, 12:44 pm

dannygraves wrote:
aloha450x wrote:ok i dropped a 145 in there and turned it out 3 turns. so danny what you are saying is that when i go wfo it should bog for a sec that run like a scolded dog. so i take away fuel by turning the knob clockwise until the bog goes away correct.
IF your gonna use it, open it way up, so it blubbers, then keep cranking it in until it stops blubbering. but this is all at WOT

if tuned right it should be a very smooth transition, it should rip right when you open it, then keep pulling.

Danny has it right on. Once you find that "tip over" point where she stops blubbering, you are still on the fat side. Depending upon the motor, you can go quite a ways before it is too lean.

dannygraves · Post by **dannygraves** » June 30th, 2008, 1:49 pm

aloha450x wrote:hey danny who is this DeWayne guy?

http://www.bannedcr500riders.com/board/ ... php?t=1848

dannygraves · Post by **dannygraves** » June 30th, 2008, 1:50 pm

4Z wrote:
dannygraves wrote:
aloha450x wrote:ok i dropped a 145 in there and turned it out 3 turns. so danny what you are saying is that when i go wfo it should bog for a sec that run like a scolded dog. so i take away fuel by turning the knob clockwise until the bog goes away correct.
IF your gonna use it, open it way up, so it blubbers, then keep cranking it in until it stops blubbering. but this is all at WOT

if tuned right it should be a very smooth transition, it should rip right when you open it, then keep pulling.
Danny has it right on. Once you find that "tip over" point where she stops blubbering, you are still on the fat side. Depending upon the motor, you can go quite a ways before it is too lean.

yeah, I've got one of the mikuni powerjet, so its a jet change everytime, so even though I'd like to run it leaner to get it a bit more crisp, I still want to have the safety margin of being on the rich side and not swapping the powerjet every single ride.

4Z · Post by 4Z » June 30th, 2008, 4:58 pm

Adjustable pj's, the only way to fly

dannygraves · Post by **dannygraves** » June 30th, 2008, 4:59 pm

eh, in the gen-1 frame I wouldn't be able to reach it anyway...

aloha450x · Post by **aloha450x** » June 30th, 2008, 5:06 pm

i gave him a buzz and wow that dude knows his shit. he told me to drop in a 250 cdi box, put a 45 pilot, 170 main and three turns out on the powerjet. he said if i dont spend alot of time at wfo just turn the powerjet down until it stops blubbering. but he said if i do spen alot of time at wfo to leave the powerjet at 3 turns out and lean the main until it stops blubbering.

dannygraves · Post by **dannygraves** » June 30th, 2008, 5:14 pm

ya, the dude can talk your ear off for weeks. did you tell him I refered you, cuz he has all sorts of funny stories about my old bike

BTW, I'm running the 250 cdi and it flat out RIPS

aloha450x · Post by **aloha450x** » June 30th, 2008, 5:18 pm

yeah i told him that you told me. haha he talked so long his cell phone batt died. i had to get off anyway and i got bitched at by the boss. oh well fuck it.

dannygraves · Post by **dannygraves** » June 30th, 2008, 5:22 pm

haha, ya, his batt died yesterday while I was talking to him! I got all pissed off because the pipe he modded for me didn't fit and I should have just called him before banging on it, but oh well, he said he'll take care of it!

fastkart · Post by **fastkart** » July 2nd, 2008, 3:07 pm

Frank and I are going to swap carbs... my 38 a/s for his 39 with powerjet thats pictured. I'm looking forward to having an adjustable powerjet. The mikuni has peace of mind from knowing exactly what is going thru the motor, but it's a pain to deal with.

britincali · Post by **britincali** » July 2nd, 2008, 3:20 pm

This is the only real powerjet

BannedCR500Riders.com

pwk over rev?