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Confused on cutlers adjustable weights on 10' M8 9000ft+

Fearless Catman

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Nov 30, 2007
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The Sheyenne River Valley of ND
I originally put in the order for 60-70 gram adjustable weights from Cutlers for my 2010 M8 with the hopes of being able to run 63 grams for 9000ft and up. I just got a call from Cutlers and they told me I wanted 70-80 grams instead and to run 70 grams and have my RPMS at 7800 for optimal running at 9000ft plus. At this point I was kind of lost because the information I got previously elsewhere does not quite come close to their recommendation. Was wondering if any of you can clarify on what I really need to do. Are they right on with their recommendation?
 
L
Feb 1, 2003
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If its from cutler i am shure it will work! And the other recommendation you got, was this from someone that is running an 2010 m8?
 

RickM

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May 25, 2006
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Central Wyoming
Fearless cat

I can tell you what i know as stock on 09 and 2010

stock on 09, peak hp was at 7800, and cat recommended 68 weights at 9k

stock on 2010 peak hp is at 8100, and cat recommendes 63 if i rember right.
talking to my dealer they told me that they were running heavier weights like a cat 67 or 68 on the 10 and running well at high elevations. The porting is different on the 10 so it makes its power higher up. I dont think you can swing the 70-80 at altitude. just my thoughts. RickM
 
A
Jun 23, 2004
1,954
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Black Diamond, WA
I don't think it'll pull 70-80g weights, and not because I know sh!t about clutching either. It's because my 08 M1000, CPC head & intake, SLP exhaust is running Cutler adjustable 70-80g and it was set up by them at 72.5g for 10,000ft elev.
I bought the sled this way and PO said he never touched the primary. Cutlers set it up new out of the box.
I asked Cutlers about the setup and just got some stupid bullchit answer like "If we set it up and that's whats in there, it's got to be right."
That doesn't help and it would seem a piped 1000 would pull more than 72-73g in a 6 tower clutch...but I NEVER overrev. In fact, I'm actually a tad low 7700rpms tops, usually a bit less after the clutches get hotter, so either way, 70g seems a little heavy for teh 800.:confused:
 
S
Dec 29, 2008
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White Salmon, WA
I just got a set of 65 -75 cutler adjustables for my 09 M8. The guy I talked to at Cutler couldn't even tell me how much weight could be loaded into the tip vs the heel. After checking it out after I got the weights, there would have to be 1/4" of set screw weight sticking out of both the tip and the heel to be able to take 10 grams worth of pin weight. 10 grams works out to 2.5" in pin set screw length. Only 2" in the hole. So, really the 65 -75 gram setup barely gets to 73 grams. And - to do that you must load 2 grams in the tip. I was going to buy 68 gram weights for my winter trip but now I'm glad I have the adjustables to dial it in correctly for where ever I end up riding. Many different threads here people have indicated that at 8 -11K, the 68s are too light for 09 M8 153 with SW or SLP pipe kit. Plus I can get to just over 70 grams without even using the tip, for mountain riding - and therefore don't have to take the weights off :D
 
L
Feb 1, 2003
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Well, if the 10 M8 really is close to the power of say my 07 m1, i run 4 63's and everything else stock but a shift assist, and ride 9000+ and pull 7300 r's. so at 4x63=252 grams and 3x70=210grams...... so am i way wrong here or what? but to me it should pull them. please correct me if i am making false comments.
 

Fearless Catman

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Nov 30, 2007
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The Sheyenne River Valley of ND
Thanks for the replies fellas. This is what I was expecting for replies. I knew they couldn't be that right on. They knew it was for my 2010 M8. That part was obvious. Just couldn't believe they told me to go with 70-80 and start at 70 and run at 7800 or less when I knew I needed to drop a lil grams to bring up the r's a lil more. The good news is they're giving me the 65-75 instead for me to try instead of 70-80.
 
V
Jul 4, 2008
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orem, utah
Well, if the 10 M8 really is close to the power of say my 07 m1, i run 4 63's and everything else stock but a shift assist, and ride 9000+ and pull 7300 r's. so at 4x63=252 grams and 3x70=210grams...... so am i way wrong here or what? but to me it should pull them. please correct me if i am making false comments.

???:confused:
 

NoSoup4U

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Dec 9, 2009
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Northern Utah
I'm running the Cutler 65-75 grm wts in my 10 M8. At 9,000 ft they add about 150 rpm using the bare wt compared to the stock 68's. So if you need to increase your RPM a little over stock go with the 65-75's. If your over-revving much with the stock wts you may want to go with the 70-80's.
 
S
Dec 29, 2008
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White Salmon, WA
NoSoup4U - Please clarify

I'm running the Cutler 65-75 grm wts in my 10 M8. At 9,000 ft they add about 150 rpm using the bare wt compared to the stock 68's. So if you need to increase your RPM a little over stock go with the 65-75's. If your over-revving much with the stock wts you may want to go with the 70-80's.

Are you saying bare weight - as in 65 base weight with NO set screws? If that is the case it should add some RPM vs cat 68's, it is supposed to be 3 grams less. If you mean with set screws, please tell us which set screws in which positions = 150 less RPM than cat 68's. In tip or heel slot and what set screws please? I just installed a set of cutler 65-75s in my 09 M8 a half hour ago and I'm trying to figure out what weight per elevation. I ended up loading .75 grams in the tip just to make sure I have some weight out there instead of all heel weight. Once you put the weights on sled, can't change tip weights, only heel unfortunately.
 

NoSoup4U

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Northern Utah
With the 65 gram base wt without any set screws - just an empty hole all the way through the wt - I'm running about 150 RPM higher than with the stock 68 grm wt. Adding weight in the tip will have more effect on peak RPM than adding weight from the heel.
 
S
Dec 29, 2008
274
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White Salmon, WA
set screws

Be aware - if you have not put set screws in all the weights yet, I had to go to the hardware store and buy a 1/4" X20 die today because I could not get the set screws into two of the weights. Once I ran the die down the set screws, they went in easy. They had really hard loctite on them from cutler that would not burn off with the torch. Had to cut them with the die. I weighed a culter adjustable weight with set screws in it as well as some cat weights and they seem to be fairly close. I've been liking cat 73's recently here on mt adams (3200-7,500 Ft), I now have 72.4 in the adjustables and the top 1/4" of the tip hole is empty. Test tomorrow here then, pull the bottom 5/8" set screw worth 2.5 grams. Then I'll be at 69.9 as a base for when I start my trip in Wyoming in 2 weeks where I should be at 8 - 12K, and will be able to add or subtract weight from the heel :beer;
 
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C
Aug 28, 2008
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North Central MN
cutler 70-80's in a 07 m8 standard

just chiming in with some info. i installed the cutler 70-80's in my 07 m8 standard. testing was done at about 1500ft.

i had previously been running a set of 73g cat weights that i borrowed to test my sled. i was revving about 7950 which is over revving as far as i know by about 150 rpms, correct me if im wrong.

i installed the cutlers, putting nothing in the tip, all weight in the heel. i loaded it up so it had about 75g in it. that sled has never hit that hard before. it was awesome out of the hole. however, it actually was over revving more with 2g more weight than the 73g cat weights. i was hitting about 8020-8030.

went home and loaded it up to be about 76g. the heel is now fully loaded with no more room for more weight. still felt decent, and it was still hitting over 7950. i did notice that across a flat field with about a foot of snow on it, i was hitting about 65 mph so i definitely understand what they mean about losing top end performance when you only heel load the weight.

the next step is to add a small weight to the tip to try to balance things out throughout the powerband.

the only thing i really don't get is when you heel load or toe load, they say to bottom out the set screw. there must be a spot in the weight where the threads aren't fully tapped through. otherwise you would never bottom it out. so, lets say one were to put .75g in the toe, and about 1g in the heel. you really wouldn't be heel loading or toe loading would you??

i definitely like the ability to adjust weight so easily. even if you need a bottle torch and some loctite to do it. i have been just using blue loctite. the green stuff is harder to come by where i am.

i ran those 73g cat weights last winter in the bighorns and cooke city. i found it only hit about 7500 rpms, so it was lacking some, but the sled felt like it still had good power.

i am thinking with the cutlers, of running bare weight when i get there, 70g, and going for a quick rip to see what it hits. then if needed i will add a little to the heel for low-mid range performance.

if anybody has any other tips regarding these weights in the 07-09 motor, please post them. very curious if im doing things right or if i should be changing stuff.
 

MUZBOMB

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Aug 15, 2008
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Albeta sometimes Saskatchewan
I just got a set of 70g to 80g Cutlers also for my 09 HCR. I ride at 1500ft-2000ft and 6000ft-7000ft. Are these the right weights for me??? I dont really have a clue about adjustable weights and i am no clutching expert. I run 70g cat weights at 6000-7000ft and 77g at 1500-2000ft. They seem to work well for me i was pulling 7880RMP's in Revy and 7920RMP's at 1500-2000ft. Anybody got any info on how the adjustables work?? I see there are difference pin screws with different lenghts. How much weight are they each?? Thanks
 
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