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August 15th, 2020, 09:13 AM   #11
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Wauu! I even dont know that Praga were importing to US. Yes its is very similar to husaberg. Its pitty that they are not making them anymore same with berg
But you can buy JAWA 625 engine or 710 . They are still making them a think, but brand is JAWA-AMS
Show us some pictures!
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August 15th, 2020, 11:42 AM   #12
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Crazy idea: lc4 690 on exc street legal.. The era of husq630 husq570 husq510 husa650 husa570 smc660 is now over
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August 15th, 2020, 04:51 PM   #13
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Praga ED 610

Here you go.Husaberg / Husqvarna and similar engines-100_3801.jpg

Husaberg / Husqvarna and similar engines-100_3807.jpg

Husaberg / Husqvarna and similar engines-100_3808.jpg
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August 16th, 2020, 12:47 AM   #14
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if they had factored in the further distance apart of the main bearings before they started they would have gone to a 34mm+ big end. so when the balancer went onto the crankshaft I'm not sure but I think early on. They just underestimated the big end required. having said that, KTMs were all 32mm at the time.

I'd like a chat with someone who specialises in the old 400/450/520/525/530 and ask them what their pins look like and whether they had any flex.

Taffy
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August 16th, 2020, 08:53 AM   #15
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Dear Taffy I read about a bushmeccanic post about the main bearings of this forum. It reported on problems faced by those who raced big bore kits on ktm 520 525 560. Bushmeccanic focused on the fact that a 32mm crank pin combined with roller bearings with non-rounded rollers on the ends led to premature failures. The problem I think is the combination of three things that do not get along: heavy cranks (which spread at high rpm), crank pin not oversized (which makes the shaft a little flexible), bearing rollers that do not like lateral load at all of the crank that spreads due to the high rpm (because the rolls do not have the ends rolled up). I add that there are bearings that hold a pin in axis without flexing, they are for "tilting moment loads". But such bearings simply double deep groove ball bearings. However, I believe that rather than keeping the crank perfectly aligned without spreading, the crankcases would break. I add that the husqvarna 570/630, 510 450 have a 30 mm crank pin,

Last edited by Alfy; August 16th, 2020 at 04:10 PM.
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August 17th, 2020, 12:21 AM   #16
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ther Husky's go at the big end but not on the mains. their mains are enormous - 72mm and there is no water pump - half speed - intermediate shaft just above it. Husabergs would love to have gone to a 72mm bearing but the w/p - hs - int shaft meant that it couldn't.

whereas the balls can take the speed loading of the 400/450/470 they can't take the power loading of the 628/644. a roller is required.

with a roller you need true precision of a built crank, you need solid and no flex and as you know - they flex. it isn't the pin flexing - even in the 32mm, it is the left and right flywheels leaving the pin.

with plenty of axial float they are all fine regardless of whether you like NTN - SKF or any other roller. they are 100% fine with 0.7mm plus.

as for that trachiodal bearing, I have the opposite view.

you ask; if I let it all flex in the bearing it is better.

I say; it just flexes even more and now we are in extreme trouble, basically the crank needs to either be held 'true' or to run wild.

my experience is that if you hold the crank and yes, let the cases take a great deal of strain that they are fine. nobody breaks cases - least not like that and how you mean.

as for the mains, nobody has trouble now, thanks to guys like myself coming on here day after day asking for far greater axial float.

But as for NTN being better Alfy, your a fool if you think so. you saw what I wrote in that other thread last week. it wasn't my customers having problems or I wouldn't sell them. you hold principles while selling in this job at your peril. You want the bearing to hit in the bottom of the 'L', right in the corner.

The SKF is a superior design and product altogether. they have dropped the NTN bearing from the Husaberg books but you can still buy the SKFs.

Taffy
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Last edited by Taffy; August 17th, 2020 at 12:53 AM.
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August 17th, 2020, 09:51 PM   #17
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I looked at the post on main bearings in the other thread. Beautiful photo of the hole in the crank pin where you can see the internal halo where the pin / hole contact is missing. Regarding the shape of the roller between bearings of different brands, I believe that to know which shape is best just look at the specifications and we will find that if the roller has a radius on the edge then it holds more axial load. However, regardless, it will not save the main bearings if the shaft clearance between the crankcases is less than 0.7mm, as you good said! I wouldn't be surprised if KTM removed a product from its books just for commercial deals
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August 25th, 2020, 10:37 AM   #18
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Originally Posted by heidenberg View Post
Lets see some pictures of this thing!
I'll second that!
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August 25th, 2020, 11:27 PM   #19
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Originally Posted by Goose916 View Post
I'll second that!
but they are 4 posts up?

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September 3rd, 2020, 08:54 PM   #20
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No ntn has ever failed in the same premature way as skf .... Includes zero endfloat on a 644 built in the UK.

Find a picture of a failed ntn out of a berg... There are none

Watch the fink desert race docos on YouTube. This is the test environment orangeberg was in to come up with the observation of ntn handling lower end float.

Wot runs with high gearing for hours, no green Laning

The code on the ntn specifically indicates special design to accommodate high axial loads and misalignment.

As for the ntn being dropped, even ktm au doesn't know anything about that. It's also still a current part number for 2021 model ktms.

The fact that skf need at least 0.7 mm to survive is proof they are less able to handle axial loading ... Nuf said, I've used both and prefer the cheaper one that lasts longer .
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