Free POWER NOW Mod, What up?
Posted January 28, 2003 - 09:47 PM
Posted January 28, 2003 - 11:18 PM
Posted January 29, 2003 - 03:30 AM
Posted January 29, 2003 - 03:51 AM
OK I gotta ask, where do you guys get all this spare time to jack around with your bikes--come up with these inventions, etc?? I am hitched with yung'uns and there is NEVER enough time for the REAL needs, like this!!!
I applied at the You-Don't-Have-to-Work-to-Get-Paid company where I suspect many of you are employed, but could'nt get an interview.
Posted January 29, 2003 - 04:10 AM
OK Chris, since I KNOW you are awake, no matter what time zone you are in, here goes...
Did you, or better yet, should you re-jet the bike for this mod? Is it going to run lean and fry the thing on the first ride or is it simply redirecting the airflow so there is really no adjustment needed?
Has anyone pulled their plug before and after to make any comparisons?
Posted January 29, 2003 - 04:37 AM
Posted January 29, 2003 - 08:06 AM
Good job on the home grown PN. Someone posted this link from the 250F side. I also noticed that in your original design the plate was too short 3mm - glad you fixed the problem!
In the pics of the PN that I have (in my sig below), you can see that the plate goes much further towards the carb's slider than in your original design (12.5mm sounds reasonable) - the shorter plate will NOT work right if that plate doesn't go right up against the carb's slider. The reason is because the shorter plate will leave a gaping hole between it and the carb's slider, hence the air can travel through the top side of the plate in the venturi as well as the bottom side to get to the carb's intake which is pretty much what it does stock without the PN. The PN forces more air into the bottom side of the plate (i.e. cutting out the top side) at low RPM, this smaller opening creates more air flow into the carb using the same pressure (since it's going into a smaller opening as in a jet engine) therefore creating better low end and resisting stalls better - kind of like a turbo boost without all the complicated mechanics involved, not as strong as a real turbo unit of course but the design makes sense and it definitely helps my 250F. The 4xxF bikes may show less gains than the 250Fs since your power plants already have much more torque at low RPM but this mod should help with starting and stalling for the bigger engines.
Posted January 29, 2003 - 10:39 AM
Posted January 30, 2003 - 12:30 AM
Posted January 30, 2003 - 03:27 AM
Posted January 30, 2003 - 10:00 AM
Posted January 30, 2003 - 11:11 AM
Which one is the WR450 one?
Posted January 30, 2003 - 12:03 PM
Posted January 30, 2003 - 12:38 PM
IIRC, even though the 426F uses the 39mm carb vs. the 250F's 37mm carb, their venturies(sp?) are the same size since the WorldPower PowerNow people sell the same unit for both bikes. Once the template measurements are correct, then that template can be used by both bikes for years 01 & 02.
As for the 03 bikes (250Fs & 450Fs), the air intake venturi is built into the carb, i.e. you can't remove it like the units in the PDF document. I suspect the PN for the 03 models will look similar to the units they're selling for the 2 strokes - it will probably be harder to copy their design for the 03s since you won't have a "removable" venturi to cut and glue into but we'll see (some people on the 250F side will post pictures of their 03 units when they come in). See a picture of the 2 stroke PN at their web page http://www.worldpowerracing.com under the "PRODUCTS" button.
Posted January 30, 2003 - 01:36 PM
Posted January 30, 2003 - 02:28 PM