Clutch Setups for MCX Apex - Rev Limiter ?

[summitboy]

I need a slightly different setup for my Turbo. I am just barely hitting the rev limiter at 12 psi. I run the 8BU's loaded, 14.5 rollers, blue white primary spring, AC purple sec spring.

Darko, you had a bunch of setups posted in the private sec on the old forum. Do you still have them ?

Has anyone welded the 8Bu's to add a slight amount of weight ?

Thanks

SB

 

[hvfun]

I welded 2 grams to my dalton weights last year to bring them up to 85 grams. I like the new adjustable dalton weights. Add weight from the outside. 79 gram base weight.

 

[Ultralord]

I saved this from Darko last year.




If you want a drag racer, load up the tip, it will hole shot awesome but falls off on long pulls, if you want a climber load the tugstens on the heel and tune the mid and tip. (Supertip style weights).

I ran supertips and did away with them.

If you wanna run 12lbs of boost at (true riding elevation) 4000 to 7000 ft try the Yamaha 8BU's with 2 steel 17.2 gram rivets pounded in them.

If you wanna run 15lbs, run the Dalton DPYR 66gr (base weight) with 17.2's pounded in them.

17/18 lbs, run the dalton DPYR 70 (base weight) with 17.2's pounded in them.

Also, change your rollers to 14.5's (yamaha), run a blue white blue primary spring (a little higher engaugement) or for a little softer engaugement run the blue pink blue.

Standard yamaha helix, go with a regrind at straight 51 (Avail at Vernon Motorsports for an exchange and 50 bucks or Alpine for exhange and 60 or 70 bucks). Or a roller rooster secondary run a 45 straight cut.

In the secondary, run a stiff black spring from Alpine. No belt slip and helps eliminate the belt staying down in the sheeves when you let off of full throttle in a hurry while in the deep pow.

The Apex and RX1's are very picky on the type of weight profile you run in them. Some guys love the supertips, i didnt. Regarless of what kit you have (Boondocker, MCX or Alpine) the above will work well. Lets be honest, they all make very similar power regardless of who chimes in saying there kit spanks another kit. It's BS. Boost to boost its the set up that will shine in most cases. Each kit has there pro's and con's, choose the one you get the best support from and the one that suites your riding style etc. I ran these combo's above on my MCX and my Alpine and had the same results. (A good hard pulling sled that doesnt use belts, heat up the clutches etc)

*Note- When i leave the parking lot at 1904 feet, i will hit the rev limiter with all those weights and boost as said, till about 4000 feet. (Our riding here gets good at 4500 to just over 7000 feet). After that she holds 10,300 to 10,600 and nothing but a big grim on my face.

Trust me, the above set up works !

Sorry to hijack your thread since i dont own a Boondocker, but i've had on hands exp clutching these monsters and figured i'd share my opinion.

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[Turblue]

Summmitboy just a suggestion that you probably looked at already......have you noticed a difference in your belt tension(ride hieght) Those 3 bolts in the back of your secondary may be wearing and your belt is tight......Mine was hitting the rev limiter more when I noticed the belt tension.....inspected those bolts and they were wore...removed the spacers and was good to go.....or I am misunderstanding your post ......it was working berfore and now its not? .....or it never did?

Anyways something to look at
TB

 

[summitboy]

Mine always ran in the high tens to begin with. I get the limiter ever so slightly depending on how i hit the throttle. I looked at the tension last ride and it is in spec. I changed the bolts a long time ago and removed the washers as well. The only other thing that changed this last trip was the snow conditions. Have been riding deep pow all season up until this last trip where everything was really setup. Just looking for alternate ideas. Will see how it runs for next trip. Like i said its only hitting everyone once in a while when getting over zelous with the flipper !

 

[HYFLYR]

Like you said, if your only hitting the rev limiter in harder snow conditions i wouldnt touch a thing. I tap the rev limiter down low or in hard snow conditions but in the pow its spot on. The rev limiter is there to use anyway, right.lol

 

[summitboy]

Has anyone used a Dalton weight in the 12 psi range ? What base weight ? I would really like 10,600 if possible. It seems like ever since i replaced my stock Apex primary with a used RX1 primary i have been having this issue. As well the secondary seems to drop the belt more often as well as compared to before. I get some belt slippage now. Will try everything, LOL. Funny how it was perfect until i did the clutch change. Either that or springs are worn.

 

[Linc]

Run the 70 gram Dalton's,you won't be sorry,very adjustable and the profile works.

 

[summitboy]

Are you talking about the 70's with the quick adjust set screws ? I think the part # is QACA/ DTYA-2 (79-86.4g). Are these the 70 base weights ? I think the 8BU's are are 48.7+4.5+4.5=57.7 or so (fixed it for you Darko, LOL). I need a smidge more weight.

 

[SLY]

DYPR70 I think is the part#. They pull hard and will keep you off the limiter, they work good at 12psi with 17.2 pins. For tuning for conditions, use a Shockwave

 

[DARKO]

I think the 8BU's are are 48.7+17.2+17.2=83.1 or so. I need a smidge more weight.

LOL, 17.2 stands for MM not Grams.....

 

[summitboy]

Right, makes sense now, LOL Thanks. Darko did you use the 66's or the 70's ? Do you know how much weight one needs to drop down a few hundred RPM ? Won't the Daltons be a little heavy for 12 psi with the 17.2's?

 

[Turblue]

I am running 70's loaded up running 14-16 psi......blue white blue primary spring, purple AC spring in the secodary 51deg for 2 years now.....The only problems I have had was the bolts wearing out on the secondary...

 

[summitboy]

I just want to run 12 psi. Do you know what i should have as far as rivets with the 70's ?

 

[Turblue]

I was running 66's loaded when at 12psi (260 mapping) seemed to work ok