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The bulk of that was indeed CR500AF.
However I've done several hundred KX500AF bikes as well.
Just did 2 this past few weeks.
Ive raced both conversion types a lot.
They are honestly not much different.
Keep in mind I use CRF250R chassis for CR500AF and kxf250 chassis for KX500AF so the only difference is engine/pipes.
Stock vs stock
The kx5 has a bit more over rev ,possibly a tad more peak hp due to that.
The cr5 has more low to mid and a stronger mid range surge but does sign off earlier.
They are not different enough thst various pipes or porting wouldn't match each other.
The kx kips valve does very little, the cdi is not mapped at all to aid in timing fir the power valve port timing changes.
The cdi is a simple bypass circuit from start timing to dynamic or run timing at about 1800 rpm.
The hinda while not having a power valve actually has a nice cdi with a full rpm.range analog mapping.
So one company relied in cdi, and timing curve to broaden power, one relied on power valve.
They ended up basically the same place and oddlybenough the cr has more bottom.and mid.
The kx has more potential if anyone made a true mapped cdi to its port timing changes.
As they stand they feel a tad different,but racing them.in similar chassis it's nothing major at all.
Both are open class 2 strokes and have the disadvantages and advantages of that.
I still make them new, and love them
Www.built500.com
Same hp,but made a couple thousand rpms quicker/earlier is significantly more torque.
Dry hard pack 450 rules.
Deep mud deep sand I'm not convinced it does.
The 500 is more fun.
Ask this guy.
He came out of years of retirement ,and was still reasonably competitive at the top level, on a cr5 powered bike we built him.
Always fun debate and speculation either way
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Thought you could add a little here
Skip to 5:50 for a sick downhill jump on his KX5
I have to think anyone would be faster on a 450.
Pit Row
If so, it would be quite a hyper engine, I would think - of course, dependent on whatever engine mods you have.
So, It's no surprise to me that it would be very difficult to ride fast
As to Max's question : well, it's a bit of click bait from him. As someone earlier wrote, it would be down to a very high level rider / seasoned Pro - as the subject of the videos, Neville Bradshaw most certainly is - being on a well set up older bike, and there's quite a few bikes that could still be very competitive with the right rider. It's Motocross, still requiring far more from the Rider, than the machine, and, it always will.
CR500 vs KX500 ? - take your pick, both old Monsters , both Big Teddy Bears. Both, Enormous Fun - that you need to be somewhat careful with
Good thing about the newer bikes, they are past and gone quickly. The older bikes tend to want to roost me more.
But to me, it is just about the fun........
If you want to skip the intro of the vid you can go to the 9:55 min. mark..
https://youtu.be/A4eNJop_KC8
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