My 950 Refresh or Mission Creep...

Discussion in 'Crazy-Awesome almost Dakar racers (950/990cc)' started by sakurama, May 5, 2009.

  1. Flanny

    Flanny Flanny-it-up!

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    Way more flow, instantaneous throttle response, much better carburator in general, and very highly adjustable performance.

    Plus....Major grin factor!

    None of which will actually help improve Sakurama's riding skills.....
  2. Tbone

    Tbone off-ramp slayer

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    The cool way they rattle at idle...:D
  3. sakurama

    sakurama on an endless build

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    The physical difference in the carbs is that the stock carb is a CV (constant velocity) and what that means is that the throttle actually doesn't control the slide of the carb but rather a butterfly below. When you twist the throttle the butterfly opens which creates vacuum as the engine turns faster. This vacuum then acts on a diaphram which lifts the slide. The idea is that the slide only opens in correct proportion to the amount of vacuum so the engine doesn't waste gas or get bogged down. It works well and was a good solution before EFI but there are downsides and slow throttle response is one.

    The flat slide has a few advantages: The narrow slide creates a shorter track than a round slide but more importantly is that the slide is connected to the throttle cable so you have instantaneous response. This can create a bog if you go WFO instantly but that is usually countered by an accelerator pump which compensates for the carbs inability to provide enough gas when the slide goes up so fast (the reason the CV doesn't bog) by squirting gas directly into the intake. It's primitive and it wastes gas but it also works giving you instant and full power. There's a great "connection" between the throttle and the engine and it often creates a signifcant power increase through the range.

    Another related advantage is if you've ever been crazy enough to try whoops on the 950. The vacuum slides can be pulled down with enough G forces and stall the bike while the flat slides are on a cable and that won't happen.

    A final fringe benefit is that my bike will have the same carbs as Flanny but with a much bigger motor meaning I won't need to actually ride better than him to be that much faster! Of course anyone who's seen Flanny ride knows my grandma could go faster on an XR100 with missing spokes and flat tire - but that's beside the point.:evil

    G
  4. joneswgareth

    joneswgareth Welsh Rarebit

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    What a fantastic read - only just found this thread! Look froward to seeing that 990 engine in there! Thanks for sharing :clap
  5. Autostream

    Autostream Long timer

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    Belgrave, Victoria, Australia

    [​IMG]

    Can't wait to see this thing in action. :thumb
  6. Pyndon

    Pyndon Long timer

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    Gregor, good job....get it in there laddy!

    The stock 990 adventure is just a few bhp more than the 950, the 990 SMR/SMT motor (the one I sent you) is 12bhp more than the 950 and this is what you've got. With the flat-slides and a nice exhaust system I reckon you'll be between 15 and 20bhp more than you had in your old dog.

    The SD motor on the other hand is 29bhp up on the 950 :deal

    The 1190 is a whole different ball game but totally unpractical for an adventure bike!

    I think you'll like the SM motor.

    Pyn

    Flanny......I've just a couple more 990 SMR motors if your interested :evil

    :lol3
  7. sakurama

    sakurama on an endless build

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    Let me know what it will cost to keep Flanny from getting one of those 990's!

    If I saw 20hp that would be a 20% increase and that is huge. I'd be happy.

    G
  8. sakurama

    sakurama on an endless build

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    Okay, sorry for the delay. As you might imagine I moved my studio and then we moved to Portland and then I just got back from a week in the desert shooting the 2012 Rev'It! catalog (which was sooo cool - I wish I could show you some shots but you'll have to wait. Good stuff coming!) so I've been busy beyond belief.

    Anyway, once back in NYC I got a day to head to the shop and do a bit of work on the 950. Sorry for the crappy photos - all I had with me was my iphone (well, I also had $100,000 worth of Hasselblad too but I didn't feel like carrying it on the subway - sorry, when I'm not working I prefer a point and shoot or the phone).

    The engine is in the frame now:

    [​IMG]

    And for those of you curious what was the demise of my engine it doesn't seem to be related to the water in the oil. I found this when I opened up the clutch side:

    [​IMG]

    And more in the pan:

    [​IMG]

    So it appears that my timing chain exploded. There's a lot of metal and debris in there so basically I now look at that engine as a 90lb spare parts holder - it's very organized with fasteners, clutch, stator, rotor etc conviently stored in an identical place as my 990 engine. Really I consider it now a source of those nice 6mm dished head srcews that are so hard to find. Expensive source...

    I was supposed to have dinner with Judiaann but took a rain check to work a little longer since I decided to fly out a day sooner as my daughter was sick at home. Here's "sunset over seeley" at our shop:

    [​IMG]

    And I thought I'd put in a shout out to two really great tools I use to clean a motorcycle. One is very low tech - Pledge. If you haven't used it you should try it. I always carry a small bottle with me on trips to clean face shields (disolves bugs and doesn't streak) but it's also good for plastic and rubber like the harness.

    [​IMG]

    The other is really high tech and no, it's not a deep fryer - it's an ultra sonic cleaner. I got this for $50 and it's one of the best investments ever. You can fill it with any solvent or even just water and Simple Green and turn it on and it will just vibrate dirt and grease away. It's probably the single best carb cleaner I've used.

    [​IMG]

    I have got the left side just about buttoned up. I'm finding a lot of electrical connectors that have changed from my 04 harness to the 09 990 engine (or whatever year it is) so I'm pulling the sensors from the 04 and moving them to the new engine as I'd rather not splice wires.

    [​IMG]

    And ironically enough when I moved to Portland I met Ken (mortimersickle) who did the same transplant and he reminded me to change the timing wheel which I did. It took a monster Snap-On impact wrench to get the old clutch hub off but I got it.

    [​IMG]

    I also found a lot of the little parts I needed in my spares. I always have to remind myself to check my own spares:

    [​IMG]

    And so I only got one day but I did get a fair amount done. I'm back to NYC on the 6th and I'm hopeful to get more days to work while I'm there but I'm coming to terms with the fact that it's going to take more time than I'd hoped and that leaves me bikeless in Portland with all this perfect weather and amazing roads...

    Gregor
  9. schaffer40

    schaffer40 I look lived in.....

    Joined:
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    Just saw this thread and lost 1.5 hrs (maybe 2) reading it from the beginning. What the boss doesn't know won't hurt him.
    Good luck with the build.
  10. Steverino

    Steverino Arrogant Horse's Ass #1

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    Man I am having flashbacks to my rebuild. Mortimersickle was a lifesaver and the jugs I got from him are working like a champ on my 950. Rode it to Dallas a couple of weeks ago. 2900 miles in 4 days. Ran awesome and no leaks.

    Now I need tires...:baldy

    Good luck with the rebuild.
  11. Katoom119

    Katoom119 Mmmm....Orange Kool-aid

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    Bike's looking good. Don't know what you're doing as far as getting it to Portland but if you decide to ride it and swing down East TN way let me know. I'll shoot you some of the only dirt roads I know of between Shady Valley and Deal's Gap.
  12. sakurama

    sakurama on an endless build

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    Since the 950/990 project is going to proceed slowly I decided I needed another bike to explore around Oregon before the weather turned to the wet side. I was looking to replace my stolen Hypermotard with an old VFR or a Triumph Sprint ST - bikes that are on my "list of bikes to own someday" when I came across an ad on CL for a bike that was on my list but I didn't think I could afford.

    MV Agusta Brutale 910R with full race exhaust:
    [​IMG]

    Turns out I was very wrong about the price and got this for about the price of a well used Triumph or two used 990 engines!

    I thought the 950 was fast but it is a pig compared to this bike which is a rocketship. I finally got out this weekend for my first real ride and if I manage to keep my license it will be nothing short of a miracle. It literally accelerates as hard in 4th and 5th as the 950 does in first and second. Brutale is exactly the right name for this bike as it is completely and utterly BRUTAL! It's complete crap on gravel of course...

    Well, back to NYC this week and I'll have a full weekend coming up to put towards the bike. Hoping to get a lot done and maybe even try to squeeze in some evenings.

    Gregor
  13. Steverino

    Steverino Arrogant Horse's Ass #1

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    That's purdy...
  14. nomad guy

    nomad guy A legal alien

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    Stranded in Berkeley, CA
    your photographic talent is truly amazing. Oh, and the new bike as well :clap:clap
  15. Flanny

    Flanny Flanny-it-up!

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    :dizave
  16. sakurama

    sakurama on an endless build

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    That was worth the price right there! Ha!

    You gotta come and visit Flanny and take her for a ride. I think Clipper might be out next week. I'll need another dirt bike for friends but the trail here is epic. It's a dirt bike paradise.

    G
  17. sakurama

    sakurama on an endless build

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    So I've had the weekend to work on the bike and the goal was to get the new engine in and running and then get it on the dyno. I sorta did and mostly didn't meet the goal. The bike is running but I didn't get it on the dyno.

    So little by little I kept attaching things until I hit a road block and then I'd work on another project for a little bit. I was waiting for parts for a day so that stalled things. Anyway, here's something you might find interesting.

    You ever wonder about these annoying clamps?
    [​IMG]

    Me too. I decided to investigate and found them at McMaster Carr along with the nifty pliers that crimp them. You can too: Pinch Type Clamps and you want this part number for the "Side-Jaw Installation Pincer" 6541K69 and then order "Gap free Pinch with Tongue and Groove" type clamps in various sizes.

    [​IMG]

    They don't offer a kit so you have to do it piecemeal but this collection and the pliers were less than $100. They're so easy and fast to use that I've gone from loving worm drive hose clamps to thinking of them as ghetto. These are slick.

    Next up as I was putting stuff on the bike was a little project that I've been wanting to do for about 6 or 7 years - adding a second fan to the radiator. I've always figured there was room but it was never a priority but when my 525 was stolen and recovered blown up I pulled the fan off with the intention of trying to put it on the 950. As it comes with a shroud it won't fit but I unscrewed the shroud and added a small bit of rubber edging to the face and it was exactly big enough.

    [​IMG]

    Now while I could have probably added a switch to it to control it I decided to keep it very simple and I just wired it into the stock fan by stripping back a little wire from behind the plug and then soldering the new fan to that.

    [​IMG]

    [​IMG]

    Last but not least was attaching it to the radiator. I fitted the tank just to check clearance and then enlarged the screw holes in the fan body just a tad so I could thread zip ties through the holes and then through the actual radiator. On the back side I turned some delrin washers on the lathe and then used just the head of another zip tie to anchor the tail of the one going through the fan. It's a common way to attach fans on race bikes and it works well.

    [​IMG]

    So when I got it all buttoned up and bled the radiator and turned it over to prime the oil pump and discovered I forgot to tighten the front valve cover which I had to swap as it had the two oil ports instead of the one. Then when I started it water leaked at the junction of the hose and the water pump so I replaced the o-ring and that fixed that. Then I finally got it running for a few minutes but couldn't find my chain tool (which seems to have grown legs) so I couldn't put the chain on and run it on the dyno. Of course after I cleaned up and started it a second time it started pissing fuel straight out of the carb vents as fast as the fuel pump was pumping so now I need to figure that out. Here you can see the new fan tucked in.

    [​IMG]

    Anyway, I did get it running so that makes me happy - it sounds quite a bit more raucous than the old engine. Now if I can find some more time to figure out the carbs before I go and find out who borrowed my chain tool I may be able to get it on the dyno before I leave for Portland this Friday.

    Gregor
  18. Bronco3738

    Bronco3738 Mike

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    Hey Gregor, your famous. I saw you on Cafe Racer last night. They were doing the story on the workshop in NYC. I was telling my wife, that looks like Gregor's setup. Then the next guy they were interviewing was you. That shop setup looks great.
  19. sakurama

    sakurama on an endless build

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    Yeah I finally saw the show - it's funny seeing yourself on TV. :eek1 They taped that back in July and I sorta forgot about it during the course of the move. Now that I've had some time to ride out here in the PNW I'm all the more excited to get my 990 up and out here.

    I'll be back again to NYC next week so I hope to get some progress made.

    Gregor
  20. O.C.F.RIDER

    O.C.F.RIDER Loose nut behind h/bars

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    NICE MV! :clap

    Hopefully someday you can go for a ride up this way with the "950" and we could switch so I could feel just how tired my 950 is.

    See Ya!
    Chris