After more than a year of riding my 950 with a 990SD engine, I'm finally getting around to swapping the old 950 trans into the 990 engine. Original engine swap thread http://www.advrider.com/forums/showthread.php?t=912839 So, I cleared off enough work bench to make this happen, ordered gaskets and what not, ready to split the first set of cases. I'm pretty sure it's going back together with the 950 cams. The current cams are great on the top-end but, I've lost some on the bottom, where I spend most of my time riding. These are the old 950 cams, still in good shape. 600 series cams=950 611 series are in the 990, currently in the bike. If all goes well I'll have a 990SD with 950 trans and cams, running carbs. Any words of wisdom before I take apart a perfectly good running motorcycle.
Take plenty of pictures during disassembly! Watch out for washers sticking to engine cases and other small stuff that is easy missed and can cause a real headache! Plenty of boxes, those boxes with many small compartments to label everything up so it goes back in the correct place. Piece of cardboard draw outline (make them smaller then actual size) of engine covers and engine cases push bolts in place it should go back many of them are probably different length. Most of that you probably already knew so good luck! /Johan
lol you sound like me cycletech. I just start with an investigation under a cover and then 8 hours later the things completely in bit on my bench with me thinking "oops I'm off on holiday on this tomorrow"! Steve
Took the 950 out for one more spin today, to warm up the oil, and check on my truck. <embed width="600" height="361" type="application/x-shockwave-flash" allowFullscreen="true" allowNetworking="all" wmode="transparent" src="http://static.photobucket.com/player.swf" flashvars="file=http%3A%2F%2Fvid103.photobucket.com%2Falbums%2Fm154%2Fcycletech%2FVID_20141009_110331_103_zpsf8ed0509.mp4&title="> A young girl ran into it a few weeks back while "looking down". Tesla in the bay next to it. Bike up on the lift, draining the vitals out of it. Box of gaskets and a few other parts arrived last night. I'll get cracking on this tomorrow, such a nice day my girl and I jumped on the Guzzi for a lunch run.
I know you're putting back the 950 cams, but just a tought about the bottom power: The SD's headers (pipes) are really needed in order to utilize the power from the different timing (and from the bigger valves the SD's have).
Wouldn't the SD pipes hurt the low end power? Going back to the 950 cams I'm looking for low-end torque, either cams give me more than I need at the top.
Pulled the trans out of the old 950 first thing today, everything looked good, thankfully. Main bearings showed typical wear. Oil pump surface on the case looked a bit rough. Couple more hours in and the 990 engine was out. Started the tear-down but was stumped by the cam chain gear retainer. The 950 unscrews with the bolt, the 990 the bolt comes out and everything stays put. I'm assuming it's just pushed in? Special tool to remove it?
Thanks! This is exactly what I need. Surprised they say to use a screwdriver to pry it out though. :huh
I tried using a screwdriver but it was obvious that wasn't going to work, the o-ring holding it in has too much tension. I ended up modifying a small puller to grab it from the inside, then a good yank and it cam right out. Wonder why KTM changed the design? 950 bottom, one piece. 990 middle, with it's bolt. Old distributor wrench came in handy for the obstructed head nut. The reason I'm here! Going back together. I spent more time with the balance shaft, getting it apart and back together, than anything else. I took some time to work the balance weight off the shaft, followed by the timing chain gear. Valves are the same size, combustion chambers are different, as well as the intake and exhaust ports. 990 left. Back in one piece! I'd really welcome any input on using the 950 cams, I'm doubting my thoughts on this. The 990 cams appear to have heaps more lift.
You could take it a couple ways. One way to look at it: The 950 cams were designed for carbs and to pull a good vacuum signal from said carbs. The 990 cams were designed without that in mind, but with an extra 57cc in mind. I'd think the 950 ones would be the way to go, with your induction system, but that's just my opinion. This post shows the difference: http://www.advrider.com/forums/showpost.php?p=18907310&postcount=104
Keith, You and I are thinking along the same lines, 950 cams for carbs, 990 cams for injection. I woke up at 4:30 thinking about this. I too found the post you linked to, only problem is it doesn't show the "611" cams, which I have. Why does KTM not publish cam specs!! :huh What I decided is to use the 990 cams, with the "new" trans, then I can always easily switch to the 950 cams later down the road. I'll be less likely to go 950 cams today, then back to the 990 cams. If it runs sweet, I may just leave it be and ride. Kind of a moot point now, the engine is back in the bike.
It runs, like shit. Made a change to the float level while the carbs were off, bad decision. I've never seen a bike so reliant on float level. Other than that, all is well. Haven't taken it out yet, but it goes through all the gears, engine sounds good, etc. Point me to any good jetting/carb threads and I'll be forever in your debt.