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May 2nd, 2018, 02:20 PM   #31
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I Ride: "2000" FE600, 1996 FC660, 2015 Beta Xtrainer
Taffy, this engine started out as a '96. That includes the crank. Only problem is that I have 4 or 5 of the early flywheels and there's no telling which one I ended up using. I'll bet that the original to that crank wouldn't be having this problem. Note to self to keep flywheels and cranks a matched set. Hopefully I won't be seeing any problems with the primary gear. So far so good on that.

Once again, VERY good point VOR. I do have a crank seal installed now but I'll definitley take considerable care with the lapping procedure.

I've also heard that a little red Loctite on the taper will help ensure that the flywheel doesn't move. Just gotta remember to apply some heat before trying to remove it.
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July 20th, 2018, 10:17 AM   #32
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I Ride: "2000" FE600, 1996 FC660, 2015 Beta Xtrainer
So, it's been a few months and you'd think that I would have hours and hours on this engine. Well, I don't. I consider it broken in though but have been having a bunch of small issues. First, it appears that the lapping of the flywheel to the crank has worked. No more issues there. Then I was dealing with a significant low throttle position stumble which I recently fixed with a swap to a fatter needle (fatter diameter, not fatter jetting).

I did a little riding last weekend but this was on tight singletrack where a 660cc motocross bike is severe overkill. Suffice it to say that I still have no idea how it runs at full steam...but I can say this. It's smooth and fairly easy to ride. The lightness of the rotating assembly has not made it significantly more stall prone. There is no need to use the clutch to bump the engine up into the meat of the power when exiting a corner. The meat of the power is EVERYWHERE! Also, as expected, the close ratios of the FC engine, in conjunction with the fat torque curve, give me my choice of 2 to 3 gears that I can be in for any given situation. If I'm feeling fresh and have no arm pump I can, for instance, use 2nd gear in a turn and absolutely destroy any berm that might be there. Usually I'd choose 3rd for the same turn and would probably end up being much faster because it'll still destroy the berm but I won't have to shift immediately after coming out of the turn. Or, I can choose 4th gear if I'm tired or feeling really lazy and it'll chug along nicely through the corner.

Now, take all this big bore, long stroke Husaberg engine yumminess and realize that it gets even better. Here's how. I have a number of different bikes and, among them, is a 2015 Beta Xtrainer. When pushing the Xtrainer across the garage, it feels light and easy to me. Well, pushing this 660 has been a pain. There's a LOT of wheel friction coming from somewhere! I've tried on several occasions to get new wheel bearings for this bike over the last few months but the bearings I'm able to obtain from my local dealer (which just so happens to be Dan at MotoXotica) are always the wrong size (turns out my wheels appear to be from '94 or older bikes which have different bearings). So I finally got off my ass and popped the bearings/seals out of my hubs (I also have a spare wheel with bearings so old that I can't make them spin at all!!!) and measured them. Come to find out that the wheel I've been using has been missing the bearing spacer. So, when I crank down on the axle nut, that force squeezes the shit out of the inner races of the bearings, causing them to be misaligned with the outer races which are firmly seated on the shoulders in the hub. There's no telling how much horsepower I've been losing to this condition!

Needless to say, bearings are on order, wheels are disassembled, and I'm hoping to get it all back together for a trip I'm going on next weekend to go camping in the high desert where I can really let this beast rip.

Stay tuned!
Thanks from steve, tourist and ede
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July 20th, 2018, 03:11 PM   #33
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I Ride: 1 Berg, 1 Zook
I think I just got a little tickle of excitement in my stomach
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