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Honda CRF450R Throttlebody on 570.

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TomTom

Joined Nov 2012
599 Posts | 524+
Sweden
Anyone tried this TB or knows anything about it?

Im about to build a race engine for ice racing, so I need high numbers while trying not to waste too much mid.
Whats good is Im located in sweden and speaks the local language and the crew at husaberg is one of a kind, helpful to say the least :)
They hint the 42mm TB is too small to build a 570 engine good for any top end, this doesnt come as a surprice, but anyways, how to make a swap as easy as possible? (Im not looking to buy shiny stuff, function is king)
Looking at pics the CRF450R TB of 2009 is big enough, 50 blade and then tapers down to meet the head, but there is plenty goods where they meet, meaning it can be taken up a good bit, perhaps taper down to something like 46-48mm. Its keihin and looks pretty much identical to the husa minus the size.
Anyone had a closer look at this TB?

Thanks for reading! Cheers Tom
 
Very interesting idea. Isn't the current KTM450 and 500 throttle body a 44mm? I would like to hear how your project progresses!
 
Hi Tom, the TB is identical as far as I could tell, I was considering one when I built my motor, but opted for a bored out husaberg TB to maintain bottom to mid performance. I did notice that the bigger TB flattened mid range performance and increased top end wail.

The rubber spigot is easy enough to shape and blend from the round TB to the oval intake port.

The intake tract is very short on the 570's so that's something to consider.
 
Thanks for chiming in guys!

berglsmerg, Ive had good results within 260 to 300mm valve to stack end measurement on other engines, Ill see if theres room for that.
Ill try and buy one and get back to you when fiddled with :)
 
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have they found a road and track cam yet? the 570 cam is for MX really....

the OEM cam is so technical to make I guess you have to buy another (more suited to SM) cam from KTM?

short shifting and no top end.

...and good luck with this one. the problem is that there are just so FEW of them out there that it isn't financially viable.

regards

Taffy
 
I was thinking having the stocker reground by Thumperracing, any thoughts/experience with that?
I have their high comp piston and they say its a good combo for my intended use, but I havent seen what duration and lift it renders.

Theres also a regrind called tornado, I have no idea what that is though.
Any ideas are welcome.
 
Tornado did one for the early Husabergs. are you sure that this is for the LDC engines?

I think reprofiling is much cheaper as it is a very elaborate cam. there are problems though with re-profiling is I found out.

we ended up whereby you grind them to the stump and then press on a new profile pre-made.

regards

Taffy
 
I have a 450 cam in my 570 ice racer and was thinking of sending that to thumperracing. Possible? I dont see why not, but might as well ask..
I do have the original 570 cam untouched too, but would like to keep that one original. I also heard that a KTM 530 cam is an improvement over stock.
 
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there are no problems building up and regrinding cam lobes if it is done properly

not all filler rod material is created equal

thumperacing reprofiling uses the good stuff and they do a fantastic job of it

have a look at tourque monsters 663 build threads, re tuning etc shame the pics re not showing.

TORQUE MONSTER RACING 2011 Husaberg FS665

bergsmlerg has a cam as well
 
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jon andersson said:
I have a 450 cam in my 570 ice racer and was thinking of sending that to thumperracing. Possible? I dont see why not, but might as well ask..
I do have the original 570 cam untouched too, but would like to keep that one original. I also heard that a KTM 530 cam is an improvement over stock.
Click to expand...

Thanks for that gents, TR seems a bunch of enthuiasts to me = good to my ears. I would be the same but in sportsbikes.
Jon, I had a good chat with Jens at husaberg about the overall engine design, you may want to shoot me a PM, unless youre a contender that is :D The 450 cam is shorter duration than the 570, and closer lobes, for example. Real short cams as hinted -> top end impossible.
 
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570 cam is the "biggest" cam made by KTM for the 70 degree motor also the 530 KTM motor. Web camshafts can also do regrinds.
 
I have a reprofiled cam, while I didn't measure it, when compared to the stock unit it offers more duration and overlap. Ive found this cam to have great acceleration thru the midrange and into the top, still pulling strong all the way to rev cut. Befor the cam I was just as taffy mentioned all short shifting and no top end.
 
I've had a larger throttle body fitted to my 570 with head work and some other mods, I wanted to fit a ktm 530 cam shaft to bring on the top end a bit more but it didn't eventuate due to some changes in the workshop staff it was lost in communication. I wanted increased top end and liked the cam delivery of the 530 engine when it's right up top. The downside I'm now living with is that due to the new throttle body being a slide instead of a butterfly it tends to stall the engine off the bottom sometimes when it's given a quick rev , for example , when jumping to level the bike or crack it on before landing a jump , popping the front wheel to wheely over logs - it has resulted in a few big moments. It was dyno tuned extensively but the problem is still very much there. It was built to be a smr engine though it has not really seen active duty on bitumen or deco since the rebuild
 
Smr spec = high rpm, sustained rpm. Throttle response in the low end of the range, idle to 2-3000 rpm is usually sacrificed which is where you are at mate.
Any pics of your throttle slide setup ?
 
Torque Monster said:
570 cam is the "biggest" cam made by KTM for the 70 degree motor also the 530 KTM motor. Web camshafts can also do regrinds.
Click to expand...

Thanks for info. I noted the quoting on biggest, lol. These cams are tiny yes.

Cam specs for 450 and 570 is according to husaberg:
450 cam:
In 233 deg, Ex 234 deg, centerline 110/113, lift 10/9mm

570 cam:
In 244 deg, Ex 234 deg, centerline 115/113, lift 10,5/9mm

Id like something in the fashion of 250 all around and 110-112/108 centerline along with 13:1 static compression.
 
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Just had a word with a tech at thumperracing.
Their regrind is a bit longer than I was initially looking for, but I already have their CP piston which in my book is a must to have bottom end ok with the regrind, the pair will match well, very helpful crew, much appreciated!

This build will take some time, but its got to be finished this year as riding season is january through march, Ill get back with the findings on all bits.

Itll get mapped and all settings properly dialled in, keep your fingers and toes crossed for it turns out a fun bike!

Cheers!
 

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