Right now, this is more of a theoretical question, Im just looking for input on the changing things in the primary pulley of the ultramatic tranny.
A little background...we were out riding last weekend, and doing more high speed running than slow. The bruin was turning 7400 rpms, at 35 and the kodiak was churning at 6400. Both have plenty of throttle left, and have plenty ot horsepower to pull those speeds. Both will go faster, this is just the comfortable speed for the trail we were on.
We were thinking of adding weight to the weights, just pressing in a sleeve, in the inside diameter of the weights. To hopefully reduce the rpms a bit, and still pull the same speed, just at a reduced rpm.
Anyone know much about this? Know of any websites which descibe the changes which can be made and what the pros and cons of this would be.
I know it should reduce the gas consumption, and itll probably be a shade slower, on the top end, and on acceleration.
Both seem to have more than enough horsepower for what we do, and should be able to handle the higher ratio , with out much stress.
I was thinking about adding 5% to the weights, and see how it goes, and then try 10%, if that wasnt enough. If it turns out we dont like the results, we can just press out the sleeves we make...and its all back to stock.
In the highlifter and other clutch kits, for the ultramatic...are those weights lighter? Which would help out the gearing for bigger tires. Or is it the secondary spring, thats changed?
Like i say, were looking for input, i havent done much playing with the weight and springs, on these autos, and any opinions are welcome.