kx500 vs crf450

[moonie]

Hi I am new I just got me a 1992 K5 with fmf pipe and she is fast i love it. I know a guy that has a honda crf450 with fmf pipe and a hot cams and he wants to race me for $.  :?He sed any stock 450 will kill my K5 is he right and will he beat me in a 300' and 600' road race? Thanks guys

[Polar-Bus]

Oh boy, here we go...

"if" traction is ideal, and "If" you can efficiently launch your KX500 you will kick the $hit out of any stock or even modded 450F...

however be warned, a 450F "can" beat the KX500 if the opportunity with the above mention variables is presant..... Trust me I know I have a KX500 and a YZ450F, 75% of the time the KX500 wins.....

[drewh14]

Road race? Traction shouldn't be much of a problem. Keep the front end down and get off the line quick and its not even a question. Then again, 600 feet later a bad start might not break the race for you.

Let us know how you do! Nothing like whooping a shiny new CRF with a 17 year old monster!

[moonie]

Thanks guys i will let you know who win the race.

[stroke.n.smoke]

How much weight difference is there between you two, that will play more of a role than power.  If your 250lbs and he is 125lbs you might not win...

[YUNGGUNNAZ]

i've seen crf500 do a number on some modded k5's in 400ft.weight,rider ability and actual bike setup makes a big difference.pick a distance to your advantage.

[YUNGGUNNAZ]

i meant crf510.

[Fowler Racing396]

u talking bout ricks 000 bike?   that thing is quick. . .put down alot of 500's. .

[BDI]

If the bikes have ample power to pull the riders that are on them then there are some other things to think about. If both bikes rev up at about the same speed/build power at the same rate, the gear ratios are close to the same you may not see a big difference between the bikes on flat asphalt. Infact the crf may beat you on top end if the two bikes have close to the same final ratio do to the crf turning more rpm. You need to load the bikes to show which one makes more power. you can do this by putting a taller gear on the kx500 or running the bikes up a steep hill. your 1/2 ton chevy pickup might be just as fast as your buddies 3/4 ton duramax but put a fifth wheel on bolth truck and then see which one is faster. You should go up one tooth on the front and down one tooth on the rear from stock and then tell him you want to race 500' for $500.

[kx560]

Out on the trails and tight stuff the 450's are fast. I bought the 09 red one from a friend with fmf mega bomb and carbon silencer and that bike just screems. I also sent the ecu to tokyo mods and it got a little more on top. These bikes really rev and with the efi almost always make power. I think that if the k5 is running well you should have little proble though.

[kaw rider]

i see all the time the guys dont load there motors down with gear, 2 or 4 stroke.

[YUNGGUNNAZ]

yeah Dan the 000 bike Thats a 4mil with head work but mild cam and junk pipe.but he can ride.Slim's nightmare. 

[moonie]

I am 150 lb. my buddy is like 275 lb.. I dont know what the stock gearing is on the KX500 so I dont know what to put on for the race. I was told by a bike dealer/owner in my town that a KX500 was way faster than any 450f he got for 2010 I was gonig to get one before he sed that. Know I have the KX500 I hope it is faster.

[Polar-Bus]

Both my KX500 and my YZ450 pull about 85 mph for top speeds. The KX500 definately gets to 85 mph  faster than the YZF..

Also 50 mph speed "roll on's"  the KX500 is king as well. The brutal midrange of the KX500 is just that "brutal". The huge bonus with the YZ is simply engine "rideability" the power is so smooth, and thick torque. Just a fun bike to ride all day long. After like 3 hours on the 500, I am just beat to death physically.... 

I love this saying about a 500cc 2 stroke : "You can't wait to get on it, and at the end of the day you can't wait to get off it ! "

[tharden]

This is what I have learned to help my kx500 out.  Number one thing I improved was my technique.  That in my opinion is what sets most races apart.  I am just a trail rider, but I practiced for weeks on taking off in second gear.  The take off is where it is at on the 500.  The next thing I did to my bike is as follows.  I removed excess carbon from the exhaust port.  I then put the stock airfilter back on the bike and rejetted the carb to 168 main.  I have a gnarly FMF pipe on it as well.  I do believe how ever I am loosing a lot of traction with the tires I have now.  I may look later into different tires.  Your weight will also help you out a lot.  I would say since I do not know the condition of you bike both of you have fairly good odds of winning.