8bu-00 weight suggestions

S

srx4life

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Dec 16, 2007
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Location
iroquois falls Ont, Canada
hi guys i have decided on a set up for my 2001 srx 700 and this is what i ordered,

-orange primary spring
-8bu-00 weights
-silver sec spring
-50/44 helix
-22/39 gearing

Now what would be a good starting point to load these 8bu's with in order to achieve the required 8500rpm's??

Suggestions please!!!

tip ________

Centre _________

Heel ___________

also what are your thoughts on this set up?
 
But try

.8 Tip
4.5 Inner


If you have a modified engine that will pull the weight try this:

3.1 tip
3.6 inner
 
Last edited:
YAMMIEGOD3:16 said:
VERY CLOSE TO WHATS IN MY 2002 SRX. WHO,S ORANGE PRIMARY SPRING ? OUR HELIX CHOICE IS DEFFERENT. 3:16 (yammie tony)
Click to expand...

Weights/Rivets:

I'm pretty sure that's what you have/had at one point. It's a setup I wrote down from you Last year. For a 660' race.
 
Judging by the gearing you've chosen this isn't a race setup. I would advise changing those weights. Especially if it's an aggressive trail setup.
 
YA I ACTUALLY HAD GREAT LUCK WITH THE 8BU SET-UP I THREW IN MY 2002 SRX. AND I HAVE RUN THIS SLED UP TO ONE MILE AND STILL PULLING. NOW WE HAVE LOST THAT DISTANCE, SO WHAT I DID IS MADE SLIGHT GEARING CHANGE. YOUR VERY CLOSE ON YOUR SECOND CHOICE YOU POSTED ON RIVETS VS WHAT I USE. I NEED MY NOTES TO BE SHURE. THIS IS A NICE ALL AROUND SET-UP THAT HAS WORKED FOR ME BECAUSE I LIKE TO RACE MORE THAN TRAIL RIDE. BUT 98700 YOU MAKE A GOOD POINT, AS A EXAMPLE, 8DN-20 SET-UP MIGHT BE BETTER ALL AROUND. 3:16 (yammie tony)
 
I am aiming for a real agressive corner to corner trail/race sled, i know you cant have both but i am told that this will suffice. i am not looking for a top end sled just an agressive sled. I have read on some ty posts to use 4.5g in tip. does this sound right? 98700 says 4.5 in heel???
 
Did you buy that Orange from Mopar1???? If you did I want it!!!!!!!!!!!

That's going to give you a WAY to high engagement from trail riding, Like 5000-5500, ESPECIALLY with the engagement ramp on the 8BU-00's!

I would get a set of Heel clickers for corner to corner. The 8BU-00's has a light tip, and back shifting is very poor with them. So when you come to a corner and slow down, and go to pin it, The clutches are in high gear, Like a mustang....... Driving down the straight away in 5th, then you approach a corner. You keep the stang in 5th, But slow down 100KM.
 
When using a dual angle helix with an 8bu weight put the majority of the mass in the tip. The inner allready has a lot of weight built in to it plus it shifts out very aggressively. 4.5 in tip & start at .8 inner.When u put most of the weight in the inner hole it pounds out hard but falls off real quick on acceleration.
use a w-w-w yammie primary & green at 80 wrap & fine tune from there. 8200 at start climbing to 8500 rpm at full shift.
 
Last edited:
Turk said:
When using a dual angle helix with an 8bu weight put the majority of the mass in the tip. The inner allready has a lot of weight built in to it plus it shifts out very aggressively. 4.5 in tip & start at .8 inner.When u put most of the weight in the inner hole it pounds out hard but falls off real quick on acceleration.
use a w-w-w yammie primary & green at 80 wrap & fine tune from there. 8200 at start climbing to 8500 rpm at full shift.
Click to expand...


Those rivet setups I gave were for a racing setup. But I noticed the gearing and knew it wasn't a racing setup.

I'll buy that Orange Primary is you want to part!!!!!!!!! LMK!!!!!!!!!!!
 
i currently run the www 8dn 20 loaded set up that is listed many times over on ty and run that 50 /44 helix. i want more agressive than this set up, hence the change of heart. i know that h/c's are an option but i am cheaping out because of the rest of my budget has gone to bearings , hyfax pv's...ouch and cables all exhaust gaskets etc.. so that is the reason that i am going the ol' budget route this time around.... thanks for the advice guys keep the advice coming
 
I used to run Dalton DPY 55.5 weights in my primary and then tried the 8BU-00's. For a trail setup I liked the Dalton better as they had better backshift. I also found my sled much harder on fuel with the 8BU's. Not trying to say they are a bad weight or anything but I found for trail riding the lighter weights to be better overall. Of course clutching is a bit of an art so depending on other factors ie Heilx, springs etc the 8BU's may work great for you.
 
When running 8bu,s you need a lot of secondary tension or sled will shift out too fast & have zero backshift. You can make 8bu,s feel real snorty on groomed trails with the proper secondary set up.
 
Turk said:
When running 8bu,s you need a lot of secondary tension or sled will shift out too fast & have zero backshift. You can make 8bu,s feel real snorty on groomed trails with the proper secondary set up.
Click to expand...

That could be my trouble. I found my sled would not pull proper RPM's. Maybe I was shifting out too fast. I wonder if this could also make the sled hard on fuel?? This is my setup.

8BU-00 weights with 4.5g in tip
y-w-y primary spring with 2 engagement springs
green yamaha secondary spring
53/47 Helix.

How much twist should I use on my secondary spring?
 
DUDE, I THINK IT WAS 98700 THAT POSTED THE HAUCK ORANGE WILL WORK, BUT HOPE YOU LIKE A HIGH ENGAGEMENT. EASY 5000 OR BETTER. ANOTHER WEIGHT YOU MIGHT CONSIDER IS A 8BU-10. NOT AS AGGRESIVE AS THE 8BU-00. ALSO 89A-10. GREAT WEIGHTS FOR ALL AROUND USE. 3:16 (yammie tony)
 
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