570 gearing ??

14 x 46 or 14 x 47 may be a bit too tall...

I topped out at 160kph using a 14 x 52 on my new FE450 (only 5.5 hrs) with the stock Metzler 6 Days rear. The track was flat and straight 20km hard pack. I verified 3 runs with a handheld GPS. Today, I slapped on a 51 but won't be able to test it until Friday. The axle is fully extended and chain is maxed out so I can't put the 50 on unless I cut a link or two. The stock chain is crap. The 50 sprocket will be mated to a Michelin AC-10 from my 300EXC. I expect at least 165kph. For comparison, my '05 300EXC maxed at 172kph with a 14 x 43 and a AC-10. My '02 CRF450 topped out at 168kph with a 15 x 43 and a AC-10. The '00 DRZ400...no comment...slow heavy ****.

Notice a trend? The AC-10 is a very hard but light tyre compared to a D606 or a Michelin Desert. But alot of folks hate the AC-10 due to it's lack of grip. Chains and sprocket type (alloy..steel...Talon) also make a noticeable difference.

I'll let you know how the 14 x 51 goes...

610 kit ?

and or summink like this http://ktmtalk.com/index.php?showtopic=293702

ah but its a never know till you try it

bottom line is the new bikes need more power right, no replacement for displacement

if you can get there without significantly increasing the weight of any of the important bits (the stroker kits reduce crank weight) you might actually improve the reliability of the 570 engine, stranger things have happened, like removing pre 09 counter balancers being so good

up the dispacement without increasing mass and use less revs because you've got more tourque + peak power at lower revs and any engine is supposed to be more relaible. revs kill, kill the revs... live longer

but well fair enough its an unknown engine so far and you only get one go at the safari I guess so what about a 650 engine in an 09 frame, handling won't be compromised that much. the pre 09 frames and geometry are amongst the worst ever made IMHO, unnescesarilly top heavy insane front wheel loading and terrible geometric progression for the shock.

the new engine is heavier than the old one right?

I guess it comes down to how hard it is to get an extra 10 km/hr out of the 570. it shouldn't really be that difficult

nice work on the condo i like seeing bergs do good in big races, rubs a few noses in the dirt

what you need bushy,is that crf frame of enginehardware's, thats been modified for a 650 berg motor to slip straight in.when i seen it i went oooooooooooooooh i would mind a go of that!!!
we might have to go halves in it.
bout time you moved to best part of oz so we can.
i'll donate my motor to the project.
gota die somehow.
crazy man..weed..

i'll donate my motor to the project.

Click to expand...

orrite! your on but its gonna be a carbon fibre frame 750

Maybe this is the answer?

http://www.youtube.com/watch?v=N-DuzXcQ ... r_embedded

For those interested in top speed and gearing discussions...

The FE450 topped out at 159kph today with 14 x 51 gearing. Verified with GPS. A bit disappointing as I expected marginally higher speeds. Now, I'm not sure whether to try 14 x 50 as bike shop suggested. There was a slight breeze today and the outside temp was 26 (10 deg colder than the 14 x 52 run that yielded 160kph last week). Also, I weigh 103kg fully loaded. The goal isn't really maximizing top speeds as much as spreading the gearing for my speed on the track. But it is interesting to me that 14 x 52 was good for 160kph and the 14 x 51 resulted in slightly lower top speed. Also, any of you tried a 15 front? The clearance to the sprocket guard appears awfully close. And I don't have the clutch slave cylinder guard. Any comments?

andyconda said:

For those interested in top speed and gearing discussions...

The FE450 topped out at 159kph today with 14 x 51 gearing. Verified with GPS. A bit disappointing as I expected marginally higher speeds. Now, I'm not sure whether to try 14 x 50 as bike shop suggested. There was a slight breeze today and the outside temp was 26 (10 deg colder than the 14 x 52 run that yielded 160kph last week). Also, I weigh 103kg fully loaded. The goal isn't really maximizing top speeds as much as spreading the gearing for my speed on the track. But it is interesting to me that 14 x 52 was good for 160kph and the 14 x 51 resulted in slightly lower top speed. Also, any of you tried a 15 front? The clearance to the sprocket guard appears awfully close. And I don't have the clutch slave cylinder guard. Any comments?

Click to expand...

Andyconda,
I would not read too much into a 1kph difference on different days of testing, like you say, temp.,wind direction even slight can make up to 4kph one way or the other.
A better reference would be a test on 14/50, then test with 14/52 on the same bit of track at the same time .
If the tolerances are the same as ktm, which i believe they are , then the 15 front will work although close. With the clutch saver on ,it cuts into it a bit.

Cheers,
Nick

Thanks. You're right. I'll cut my chain to fit the 14 x 50 and try them back to back.

sorry lads if i haven't read the rest of this thread but just the title is enough.

30 posts on gearing a standard bike.

pathetic.

you're lowering the tone and i think the modeerators should close the thread for fear that k-talk find out and think we've gone south.

regards

Taffy

Yes Taffy, you havent read the thread.
Nothing wrong with it IMO, thats what forums are for.
Theres a lot more anal stuff going on in other threads right now on this site and if you wanna see some really anal threads just go onto ktmtalk!

Nick

i'm telling ya it's the slippery slope!

anyway, i'm off to start a new thread named "i re-angled my handlebars - woo-hoo!"

regards

Taffy

:lol:

I found the perfect combo...18 x 32...good for 240kph

Gazza said:

DaleEO said:

Gaza, were you able to touch the limiter at all in 5th?

What rear tire are you running Gaza, and Andyconda? What were the conditions that you two were running in?
.

Click to expand...

a theoretical top speed on bitumen with xx tyres etc etc is of no interest, the top speed we got is under rallye competition conditions, this is what is of interest to us

Oh by the way last weekends Condo 750 rallye here in Australia was the world debut for the 570's in a rallye race, we had 4 riders on 570's and 2 on 650's, and one of our team lead riders came 6th outright in a field of 85 which included some of the top national desert racers in Australia !!

Click to expand...

Congrats on your race results!!

And, you are absolutely right about a theoretical top speed. All that matters is what happens in the real world. And in this case there just doesn't seem to be enough oooommmffff to pull the gearing you want.

So in the absence of doing head work or raising the rev limiter, you might as well try going a bit lower on the gearing then and see if that nets you anymore top speed.

For what it's worth..... Not knowing what your rallye conditions are like, it would seem to me that the slightly lower gearing will enable you to pull a faster top end speed through conditions that would rob top speed, like head winds or deeper sand etc....

You are running the 14/50 set up right now, and since I don't know the circumference of your rear tire ( can you please measure and let me know?) I cannot try and predict what rpm you were running at. Based on my earlier calculations, using the circumference of the tire I run, with the 14/50 gearing and 8000 rpm one would be running 159kph.

I don't know if you know this or not, but, if you have the user setting tool, you can use the data logger function of the UST, which holds a lot if information regarding engine performance, some 912 minutes maximum of recording time is available. Further, a full read of the UST users manual is quite revealing at how the mapping system operates, and might be useful to you to get as much out of the bike as possible.

Based on your earlier post where you got the letter from the Husaberg rep wherein he stated he thought the rev limiter to be set at 9800 like the 530, we can assume that the motor will rev to that limit. Have you been able to confirm that?

So, "in theory", perhaps if you dropped to a 14/52 set up, and were able to, with the increased mechanical advantage of the 14/52 gearing able to spin the motor up to 9000 rpm, your top speed would increase to 172.7kph (107mph). This of course is theoretical as it does not take into account the increased wind resistance, etc... With that in mind you may not achieve this speed. It would be interesting to know what kind of revs you are running though.

What do you think?

i'm telling ya it's the slippery slope!

anyway, i'm off to start a new thread named "i re-angled my handlebars - woo-hoo!"

regards

Taffy


Hey Taffy - u got issues with newbies or amatures asking dumb questions. Not dumb to us - changing the angle of HB's just as important and interesting as hi-tec race specs??lol

Bloody Pom's