Maintenance & Technical > KX500 Original
kx500 power opinions
KX500freak:
--- Quote from: jfabmotorsports.com on May 10, 2009, 01:08:01 AM ---
--- Quote from: KX500freak on May 09, 2009, 09:43:09 AM ---thats a sad story ,but to be realistic :roll:
an aged pretty stock k5 delivers about 58 HP
a modded fresh 250 goes up to 50 HP or more
take the riders weight and skills ,there you go
it can be true in other words i think :|
--- End quote ---
220lbs K5 + 200lbs rider @ 58 hp = 7.24lbs/hp
210lbs ??250 +170lbs rider @50 hp = 7.6lbs/hp
You may have something wrong but if his tire is better than yours or if he has anything newer than a 1990 anything 250 2 stroke it will have a lot better traction than the K5. If he has 52.5 hp, and he could, you are even hp/weight and your but is kicked.
--- End quote ---
im with you here, i too say what mick also says,and you ,that any recent 250 can outrun a k5 as described above .
Dutch-K5 Fan:
In holland you ride KNMV or MON. They are the 2 unions to choose from KNMV is the biggest and connected to the FIM.
You start lokal than district, junior, national, Dutch championship(ONK). Than you can go euro championship and GP's If your good enough :-D
I've ridden Junior 125 races and combined 250/500 on a cr250. I was about 15 to 23 place of 45 riders Top 10 could ride
top 15 national.
One race in memory of a friend I raced the top class with ONK riders Johan Boonen(ex GP) on his SXS540 even GP rider Mark de Reuver on his full factory sxf250 and many more fast riders. Some with 500 2strokes. I hole shoted It with my self tuned 2000 cr250 wich wassent the fastest ride.
Why Could I do this???? Good luck or good rider??? :-D Don't know
A good K-5 can beat everything, a AF even beat the factory 450!!! Seen steafn Everts do this by MILES!!!
Dutchie
gwcrim:
I once beat a Kawasaki ZRX1100 with a Harley Sportster 4 out of 5 times at a drag strip. :-o :-o :-o
The other guy had no clue how to launch on a christmas tree. By the time he left, I had 4-5 bike lengths on him. The one time he beat me, I pulled a red light. I would have won that race otherwise.
Not that you aren't a good rider, but as in most racing, it's 90% racer, 10% vehicle.
tharden:
Well this is what I came up with. The reeds and KIPS valves are working well. After I cleaned my air filter I did not spray as much oil on it. I then removed the flywheel weight. After I removed the flywheel weight I could tell a big difference. The bike does not vibrate near as much. Before removing the weight while riding at low rpm the bike would vibrate a good bit and I could feel it trough the pegs. Now it is much smoother. As for starting the bike I could not tell a difference, and the bike idles the same. The biggest difference was in power delivery. I could not believe it. Before I was able to sit close to the tank and gun the bike at a stand still and keep the front tire from rising up too high. Now I have to learn how to really ride the bike. I tried to do the same thing and I liked to have gotten thrown off of it. Really impressed. I also did not see any loss in torque at low speed either, and it still lugs good at low speeds. I believe since the weight is removed the engine can spin up quicker and the tire can deliver better traction.
DoldGuy:
Tharden,
Removing the weight allows the bike to spin up RPM much quicker, getting into the Torque of the motor. If you were "Digging a Trench" before, it will happen even more without the weight. I still think you need to go up a tooth on the counter & try your cousin again. I seriously doubt a whatever year YZ250 with pipe, wiseco piston, head chambered is anywhere close to the 50 HP mark ( they produce about 44 @ the wheel stock / depending on who's Dyno) and nowhere near the Torque of a 500. It sounds as you are happy, & I reckon that's all that really matters.
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