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November 20th, 2005, 12:32 PM   #1
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Observation on a 2006 engine I just stripped.

Below are my observations on 2006 Husaberg engine internals.

A few weeks ago I stripped the first 2006 650 that was delivered to my workshop for conversion to a 750cc, I noted a few differences / updates as I striped the engine but missed a few too. I was in a hurry to get the engine built as a 750cc so I missed a few obvious things (35mm big-end pin), I had another look today as I was photographing the parts for ebay. Below are the differences I have found so far.

1) The big end pin has been uprated from 32mm to 35mm. The are using a slightly different heavier section rod, and have to mill about 2mm off of the bottom of the rod just to get it clear the cases. The rod does not have the small hole under the little end facing down, drilled through the web anymore instead a hole is drilled at the top. This strikes me as a really good idea, I wanted to have a bigger pin in the 750cc but as we are at (nearly at - we are trying bigger, shhh!) the limit of stroke we couldn’t afford the room.

2) An oil jet has been added to the cases pointing at the bottom of the piston in the 12 O’clock position above the drive side bearing KTM style. 2005 also had this. This seems good to me, though perhaps un-necessary I can’t believe oil doesn’t flick up there as it bleeds out of the sides of the rod bearing.

3) The water ways in the cases that feed the slots below the exhaust ducts in the head have been widened from 6mm holes to 6 x 12mm slots, and the head has been similarly milled in all the water ways. I don’t understand what they are trying to do here at all, in the 750cc we restrict the water jacket more than OEM, use a less conductive liner material, and by nature as people buy 750cc for more power so they are almost always run very hard. We have never had a problem with overheating????????? (Also they have used a different core in the casting for the water jacket)

4) The piston is now anodised stock. This I think is a good idea, it has been the standard in Sidecarcross 700cc 2-strokes for 10 years now to have anodised pistons. It seems to help on all fronts, being very hard it helps with ware, being low conductivity it helps with piston temp, the crowns of anodised pistons seem to accumulate less soot etc don’t know weather this is because they stay cooler or perhaps soot doesn’t like sticking to oxide. I wounder when a OEM is going to supply coated pistons with low friction sides and thermal insulated crown, I like them myself and have used them a lot.

Well that’s what I saw and what I think of it, I have a load of picture which I will try to put on the UHE as I get time. What do you think of the 2006?

Regards
Ben
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November 20th, 2005, 12:58 PM   #2
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Re: Observation on a 2006 engine I just stripped.

Hi Ben,
Thank you for the information.

Personally, I feel much has to do with production and / or supply as opposed to that of performance and / or reliability.

I say such as the "revised" areas have not proven to be a problem.

Sincerely,
Dale

PS
Perhaps the OEM has a 750 of their own in the works.
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November 20th, 2005, 02:47 PM   #3
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Re: Observation on a 2006 engine I just stripped.

Agreed! Much of what has been done seems to be the results of interbreeding with KTM, and as you say is likely production aimed. The head being a good example, the changes to the water jacket core I mentioned simply bring it in line with the KTM 525 water jacket core so both heads can be produced in the same foundry more efficiently. The down side of this for me is that the ID of the water jacket has reduced from 117mm post 2003 to 112mm which means with my 105mm piston I have only got a 3.5mm band in which to effect a seal.

If you would like to see photos of anything specific I can try to take them as I have a few more 06's to strip, just let me know.

Thank you for the comments on my last post about the updates to my website, I would like to put much more on line but alas computers are not really my forte and so I am slow at getting them to work. If only you come bolt them together and machine bits off I think I would be OK.

As for an OEM 750, I have a customer at the moment who has bought a brand new 2006 engine from me, had us convert it to 750, is buying the bigger carb etc and is flying over to pick it up when it is complete. Guess where he lives - Austria! No joke!

Ben
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November 20th, 2005, 03:02 PM   #4
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Re: Observation on a 2006 engine I just stripped.

"As for an OEM 750, I have a customer at the moment who has bought a brand new 2006 engine from me, had us convert it to 750, is buying the bigger carb etc and is flying over to pick it up when it is complete. Guess where he lives - Austria! No joke!"

Hi Ben,
I somewhat suspected such was not far off.

Lets face it, the likes of you and I often provide for virtually "free" research and development.

Oh well, I suppose because we can?

Best Regards,
Dale
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November 23rd, 2005, 01:58 AM   #5
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Re: Observation on a 2006 engine I just stripped.

Ben
i have just had the rod changed on my 03 550, and the new rod for this has the oil hole on the top unlike the old one that was on the underside.
the rod is also a slight bit thicker.
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