Apex and Mach Z

[QCRider]

Why don't you just turn up the transfer?

LB, the transfer with the Monoshock is much different than the NoAction from the '03-'04 RX1's. You have to be really careful with it or they will wheelie like crazy and rob you of forward energy by pointing skyward. I have mine set so that it pulls the skis about 4" off of hardpacked snow when pinning it from 30-40 MPH corner to corner.

 

[dyama]

That sound like a good idea! I was so excited beeing able to follow that I nevre tought about it

 

[dyama]

You are right mmmsnowbeast!
I remember seeing gps speeds of 113 to 118 mph on my 03 with 144 studs 1.075 " and that low 1" track approx. 204kl. on speedo.( with the front end lowered max). My rear end was set to the softest .I weight about 210 dressed. But what really is interesting is that quick acceleration with the innitial setting and the ripsaw that will be great in the trails.I am not crazy about the last few mph! prefer the trailable power A to B in a short burst

 

[snowbeast]

You are right mmmsnowbeast!
I remember seeing gps speeds of 113 to 118 mph on my 03 with 144 studs 1.075 " and that low 1" track approx. 204kl. on speedo.( with the front end lowered max). My rear end was set to the softest .I weight about 210 dressed. But what really is interesting is that quick acceleration with the innitial setting and the ripsaw that will be great in the trails.I am not crazy about the last few mph! prefer the trailable power A to B in a short burst

Ya dyama it is a rush to have this kind of trail power,it is addicting,but i would still like to be able to out pull my 4 year old yammiin the top end department,and i think w/some minor tinkering i will be able to do it w/this attak,sweet!!!!

 

[sx7001]

The only change to my GT was Dalton's black/blue primary spring which is stiffer through the entire shift curve. I've used this spring in my 03RX with good result. As for top end, maybe 2-3 mph difference to the stock GT. With the stiff spring my GT hit 10500rpm much faster than the stock GT. My primary now is rubber coated and the belt is glazed, the stockers primary is still clean. The old "bum-o-meter" also indicated less sleeve stretching acceleration compared to the stocker. A stock Apex pulls like a F18 on takeoff [sorta] but I think the gearing to overdrive combination is a little off to see big top end numbers. On paper a stock Apex is geared for 122mph at 5% overdrive with 8600 clutch rpm. If you find a down hill lake it may be posible to see that speed. I've machined 15% overdrive into my primary so now its time to find the right gearing to take advantage it. My 140hp sx700 on radar would run 122-124mph in 2000ft with 24/39 gearing and 15% overdrive. Even with 15% overdrive I had no belt issues using the 8dn belt. Just wish Trout Lake would freeze, can't wait to dial this thing in!!!!!!!

 

[MyOutdoors]

Don't the new mono's have straps up front? Let them out 1 hole? Less weight on the skis, more transfer then readjust the transfer rod?

 

[fourload]

I put a slightly stiffer spring in the primary,silver spring wrapped at 80 in the stock helix,windage plates on the secondary, then I set the transfer one notch more on the measuring tool and I lowewed the front ski preload to its min setting.My gt was pulling about 4 mph higher than the stock settings on the speedo at the quarter mile mark. Same conditions,same day.I knew it was faster and quicker by how much more I was pulling my friends Z. I would also bet if we would all get some miles on these things they would get faster naturally.......They are so tight untill they hit 500mi or better.I had 2 rx1's that got quite a bit faster as the season progressed.

 

[kviper]

The bigest problem with the stock clutching is there is not enough side force on the belt and it is sliping. The kit that i got frome CPR add's a considerable amount more wind and compresion force to the driven clutch and trust me it work's. sx7001 that is why you have all that rubber on your primary now, The stiffer spring multiplyed the problem. I haven't had a chance to run mine topend yet but to 90 or so it is much quicker and has a lot quicker throtle response (back shift). This kit gives the biggest gain's frome a clutch kit that i have felt in a long time. A friend has a 05 Z that is going to Goodwin Perf to be tuned by them so when we get snow we will find out what a well tuned Apex and a Z will run like. kviper

 

[snowbeast]

The bigest problem with the stock clutching is there is not enough side force on the belt and it is sliping. The kit that i got frome CPR add's a considerable amount more wind and compresion force to the driven clutch and trust me it work's. sx7001 that is why you have all that rubber on your primary now, The stiffer spring multiplyed the problem. I haven't had a chance to run mine topend yet but to 90 or so it is much quicker and has a lot quicker throtle response (back shift). This kit gives the biggest gain's frome a clutch kit that i have felt in a long time. A friend has a 05 Z that is going to Goodwin Perf to be tuned by them so when we get snow we will find out what a well tuned Apex and a Z will run like. kviper

Hi kpviper i am a little confused about yammis secondary spring rates vrs load,what are you talking about w/reguards to side force,the stock spring this year is whitevrs pink on all older rx1 shorty and most all guys change out to the silver,is that what cpr used,because that has been a very popular spring choice for alot of the kits i have seen and used over the last few years that i have been on a yammi.. Now tell me is it the spring rate that yammi uses like on the white (1290) vrs pink (12110 vrs silver (965) that is side force or there preload which they measure in different ways such as on the white at 76.84 lbs or (kg/mm) 1.372 or N/mm 13.45 the free lenght is the same on all three springs as is the wire dia. but no. of coilsare different and this is the main reason we have changed out to the silver over the years,less coils most generally will not bind up,as the silver has the least at 4.86 vrs white at 5.19 all data taken out of yammis service manual,please let me know your thoughts. Thanks Pete

 

[Srxspec]

The bigest problem with the stock clutching is there is not enough side force on the belt and it is sliping. The kit that i got frome CPR add's a considerable amount more wind and compresion force to the driven clutch and trust me it work's. sx7001 that is why you have all that rubber on your primary now, The stiffer spring multiplyed the problem. I haven't had a chance to run mine topend yet but to 90 or so it is much quicker and has a lot quicker throtle response (back shift). This kit gives the biggest gain's frome a clutch kit that i have felt in a long time. A friend has a 05 Z that is going to Goodwin Perf to be tuned by them so when we get snow we will find out what a well tuned Apex and a Z will run like. kviper

The pink or white secondary springs in either the Apex or Attak are the two stiffest secondary springs Yamaha makes. Like Pete said the Yamaha Silver secondary spring when setup properly performs much better. More compression and wind will apply more force to the belt to an extent, but it will also make the secondary difficult to fully open, often times causing belt slip and a loss in top end which can show up in a glazed belt or rubber on the primary.

 

[fourload]

The bigest problem with the stock clutching is there is not enough side force on the belt and it is sliping. The kit that i got frome CPR add's a considerable amount more wind and compresion force to the driven clutch and trust me it work's. sx7001 that is why you have all that rubber on your primary now, The stiffer spring multiplyed the problem. I haven't had a chance to run mine topend yet but to 90 or so it is much quicker and has a lot quicker throtle response (back shift). This kit gives the biggest gain's frome a clutch kit that i have felt in a long time. A friend has a 05 Z that is going to Goodwin Perf to be tuned by them so when we get snow we will find out what a well tuned Apex and a Z will run like. kviper

The pink or white secondary springs in either the Apex or Attak are the two stiffest secondary springs Yamaha makes. Like Pete said the Yamaha Silver secondary spring when setup properly performs much better. More compression and wind will apply more force to the belt to an extent, but it will also make the secondary difficult to fully open, often times causing belt slip and a loss in top end which can show up in a glazed belt or rubber on the primary.

Last year I purchased a brandX clutch kit for my rx1 and I always would get black marks on my clutch near the top from a lake run. Stock it was faster on the top end,although it did accelerate quicker. I never could figure this out. Now you got me thinking... The secondary setup with the clutch kit had a white spring wrapped at 70 and the helix full shift angle was at 40degrees. Both of which would make the secondary alot harder to open.Can't wait to get your clutch kit and try it out Allen.

 

[Srxspec]

You generally want the softest spring, the lightest weight and straight angle helixes and the least angle you can get away with and your sled will ALWAYS be faster on top if you balance this. It takes power to compress a spring, primary or secondary. It takes power to swing heavy cam arms and it takes torque to pull angle on helixs. All of the previous, except the less helix angle minimize friction at the belt to sheave contact interface and you only want as much friction that you need to keep the belt from slipping against the gear your trying to pull and the weight your attempting to move.

 

[dave583]

You fools thinking your new Apex is going to give the Mach the business are just living in a fantasy land. Its funny how you bash the mach but that is the measure of speed you must compare your sled to to feel fullfilled. Losers!

 

[fourload]

Thanks for the good technical info.Everyone around here thinks if there top end isn't good they need more wrap, more rate,less angle to keep the belt from slipping.More times than not their sleds get slower.My 2002 srx used to fly on ice and hardpack with polaris flyweights in the primary from goodwin (58's I think) and the stock straight 47 helix with that weak red yamaha spring wrapped at 70 or 80.

 

[fourload]

I gave my friends mach the business at least in the quarter already. Even if the mach is 5 mph faster on the lake and 10 pounds less I wouldn,t trade the machs smell,vibrations,poorer general quality,lack of electronic shock and higher price for my apexgt.Oh yeah I forgot the machs lack of electric start also.