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Old 03-27-2011, 09:50 AM   #46
yobuddy
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Hey quit BSing around here and get that POS running. Some day it may purr like my KLR.
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Old 03-27-2011, 06:19 PM   #47
cpmodem
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The marks on the gears aren't meant to line up exactly with the gasket surface. Only a guide to get the correct teeth engaged. Its only accurate to + of - one tooth on the cam gear. If you want to degree in the cams, you will need to remove the timing cover and attach a degree wheel.
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DISCLAIMER: All observations made in this post are mine and based solely on my own anecdotal experiences, and may contain large doses of facetiousness. YMMV, of course. You are "on your own", and I take no responsibility if someone tries anything in this post and gets into trouble with the law, damages their person or property, or goes blind. Take everything you read or hear "anywhere" butt especially on the Web with a large dose of salt.

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Old 03-27-2011, 07:32 PM   #48
BillyD OP
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Well, I happy to report the 990 didn't grenade with the 950 cams installed. I haven't ridden it yet because it just started raining (again) and it is margarita time anyway....

BTW, measuring valve lift with the 950 cams is no small feat. Unlike the 990 cams, the 950 cams have an extra journal on the end opposite the gears, which all but blocks access to the bucket when the cams are installed. Measuring lift requires a dial indicator with an angled tip and, on the intakes, moving it from one side of the lobe to the other to measure opening and closing.
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Old 04-01-2011, 08:43 PM   #49
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I borrowed Tmex's R1200GS and ran it back-to-back with my KTM 990 over my designated test route to determine relative gas mileage.

The R1200GS got 13% better mileage than my current 990 set-up (carbs, 950 cams, and 2-1 with Akrapovic silencer with insert).

With the GS, I got a GPS corrected 36.2 mpg vs 32.1 mpg on the 990. Previously, I tested the stock 990 cams with carbs and only got 27.6 mpg, which obviously is NOT a good combination. It performed well enough with the 990 cams, but when pushed in a spirited manner, mileage sucked.

Anyone claiming to get 50 mpg with a GS must be driving like a grandma, slabbing it or simply dillusional. Be that as it may, I consider the injected R1200GS the Gold Standard when it comes to gas mileage for a big twin adventure bike. Almost everyone I know that has one claims to consistently get over 40 mpg, so I was getting a bit despondent over the gas mileage I was seeing with any variation of my 990.

So the purpose of this controlled experiment was to ride a known-good R1200GS and my 990 back-to-back over the same route and compare the results. In so doing, as many variables as possible were eliminated. The fact that I only got 36.2 mpg on the R1200GS is indicative of how I ride and certainly helps me put the mpg I get with the 990 into perspective. If I got 40-45 mpg on the R1200GS and only something in the low 30's on the 990, the 990 would be a boat anchor by now. A 13% spread is tolerable. Not great, but tolerable.

Bill

P.S. Unfortunately, my local road crew buddies saw and recognized me on the GS even with my disguise...

Here was the round trip route (click to zoom out):


View Larger Map
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Old 04-02-2011, 08:52 AM   #50
mookymoo
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So.... it doesnt sound like putting a set of '08 990 Adv cams in a 950 would be a good idea
(my 950 cams have a bit of casting surface showing on the lobes... and I have some clean cams in a spare 990 motor...)

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Old 04-02-2011, 10:27 AM   #51
tahoeacr
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I am curious to come down there and do your milage test on my 990.
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Old 04-02-2011, 10:46 AM   #52
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Quote:
Originally Posted by tahoeacr View Post
I am curious to come down there and do your milage test on my 990.
Bring the Husaberg too!

Quote:
Originally Posted by mookymoo View Post
So.... it doesnt sound like putting a set of '08 990 Adv cams in a 950 would be a good idea
(my 950 cams have a bit of casting surface showing on the lobes... and I have some clean cams in a spare 990 motor...)
I think the 990 cams are junk. Their only useful purpose would be as cores for a custom set of hard faced cams.
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Old 04-02-2011, 11:35 AM   #53
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Quote:
Originally Posted by BillyD View Post
...
With the GS, I got a GPS corrected 36.2 mpg vs 32.1 mpg on the 990. Previously, I tested the stock 990 cams with carbs and only got 27.6 mpg, which obviously is NOT a good combination. It performed well enough with the 990 cams, but when pushed in a spirited manner, mileage sucked.
..

My luck with carbs and 990 cams has been better.

I am running a 990 with stock 990 cams and 950 carbs using Factory Pro jets and needles (jets 172/175.) I average somewhere around 36 mpg, depending on the ride. I usually get 38-41 on the open highway, and 32-34 on tighter stuff. Fireroads can take it down to 29-31.

All of those rates are about a couple of mpg better than I got with my stock 950 engine with the same carbs in the same chassis.

I have not yet balanced the carbs, nor experimented with needle clip position. I hope to get some improvement with those.
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Old 04-02-2011, 12:45 PM   #54
mookymoo
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Is there any feedback on 990SD cams on a 950?

There was some fleeting mention of Flanny running SD cams in his 950.
I will have to search around a bit more...

Not something I was planning to do right away, but if my cams/buckets deteriorate over the next service interval, I will need to do something about them....
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Old 04-02-2011, 03:10 PM   #55
BillyD OP
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Flanny seems to like his SD cams in his 950, but I'm not sure what carbs he is running.

BTW, the stock 950 cams I now have came from Flanny.
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Old 04-02-2011, 05:22 PM   #56
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Carbes are still carbes. The feel for me was that the SD cams move the power delivery hit up the rev range. I felt that this was in harmony with my (unique) extractors where as before there seemed a mismatch.

From the outside the 990R looks to have SD cams without the SD exhaust which seems to be backed up by the output figures, half way between 950/SD. Perhaps they found a solution to the MAP/TPS jerkiness that allowed more lift as opposed to duration.

I love this work you are doing Billy I just wish we could give you a set of each of the cam sets.
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Old 04-02-2011, 09:38 PM   #57
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Carbes are still carbes.
...
Could you expand on this? I know carbs and FI each have their pros, and their cons, but I'm not sure what you mean to say here.
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Old 04-03-2011, 04:53 PM   #58
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Sorry It really is not clear what I meant

Billy had asked for comments on SD cams with CV carbes quite a while back but as those comments had not been forthcoming I decided to share my experience of SD cams with FCR's thus the comment "carbes are carbes"

My comment on SD cams comes from a straight swap over with a half step up on the mains for safety as I was pulling 13's AFR's at high revs at WOT on the standard cams.

Unfortunately at that time My FCR"s were running rich down low to get around a throttle jerk glitch created by an ignition advance problem, alluded to by Zuber, because of not running a TPS. Which means that I cannot be more specific on what jetting changes were required on changeover as this would be the best indicator of what differences exist between cams. This is where running a wideband pays for itself. $800 X 6years = $133 per year

The fitting of a TPS to FCR's and the correct jetting thereafter is throttle control Nirvana........!!

Some one with FCR's, without the skills to perform this should contact Ken at Adventure Machines. (H2W Jet kit)



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Old 04-03-2011, 05:48 PM   #59
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Thanks. Sounds like your level of experimentation is well above my shadetree efforts.
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Old 04-04-2011, 06:14 AM   #60
Flanny
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Quote:
Originally Posted by BillyD View Post
Flanny seems to like his SD cams in his 950, but I'm not sure what carbs he is running.

BTW, the stock 950 cams I now have came from Flanny.
I'm running the SD cams, Keihing FCR39mm, and had my intake ports epoxied, shaped, and exhaust ports cleaned-up and polished. I also installed a TPS on the carbs with an installation similiar to K2M's.

Bike runs really well, but I don't have access to a dyno, so can't do a direct comparison to the pre-modification performance. Also, everything was done at once, so hard to say which mod is responsible for the smooth running...As it stands right now, my fuel economy seems not to have suffered too too badly, but the fun factor has gone way up!

Still need to do a bit of work to clean up the 1/8 throttle "cruise" jetting, and maybe try a step richer on the mains, but overall, the bike runs like a scalded cat!
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