mdkuni
TY 4 Stroke Guru
sniperviper said:Mdkuni Is the sled stock or have you adde rail extensions?
Was this srx's extended?impactindustries said:Had 3 srx's and all three broke axles. One at 130 miles away from home base. I feel your pain.
Only real mods on the sled is Ulmer's Air box mod and 13mm sway bar. No rail extensions.
maybe this is another defective part ? design?
the idler wheels
the suspension finish
the hand warmers
leaky zerks
all little things compared to getting stranded or even worse loosing control at speed!
the idler wheels
the suspension finish
the hand warmers
leaky zerks
all little things compared to getting stranded or even worse loosing control at speed!
I'm not so sure on the skidoo hollow shaft being tough. Buds xp800 with 400 miles snapped the shaft in half carving in some powder. There was another that broke in town as well.
baknblk
Extreme
Re: axle
I have never had a SRX brake an axle however my VMAX 4 did (have not fixed it yet) and I thought the part was around 150.00. I had my APEX apart and the axle seemed much larger than the SRX, but obviously the larger axle is not eliminating the problem. This is one part that should never brake imo, it is way to dangerous !
impactindustries said:Had 3 srx's and all three broke axles. One at 130 miles away from home base. I feel your pain.
I have never had a SRX brake an axle however my VMAX 4 did (have not fixed it yet) and I thought the part was around 150.00. I had my APEX apart and the axle seemed much larger than the SRX, but obviously the larger axle is not eliminating the problem. This is one part that should never brake imo, it is way to dangerous !
Mikey
TY 4 Stroke Junkie
I would be more inclined to say that the initial failure came under braking when the brake held the shaft solid and the track was digging for traction. then later under acceleration it broke. Looking at the end of the shaft the twist looks backwards to the tracks rotation. But thats just my opinion.
YAM182
Expert
If you broke an axle was your sled studded?
Do you brake hard and lock up the track often?
Or do you spin the track alot?
Meaning do you stay on the gas over bumps and land with the track spinning faster than before the bump?
Or go over snowbanks and spin the track and throw snow back 30 ft?
Polaris has on their race sled a slip shaft to take some stress off the chaincase/axle.
Doo also has something like this.
Do you brake hard and lock up the track often?
Or do you spin the track alot?
Meaning do you stay on the gas over bumps and land with the track spinning faster than before the bump?
Or go over snowbanks and spin the track and throw snow back 30 ft?
Polaris has on their race sled a slip shaft to take some stress off the chaincase/axle.
Doo also has something like this.
ReX
TY 4 Stroke God
YAM182 said:
I've never broken an axle yet, but guys I ride with have.
We all ride the sleds hard, but I will say the sleds with broken axles are ones with slightly heavier riders (same weight as me) and they do tend to spin their tracks a little more than me. I've also seen them land with the tracks spinning under power. Not wide open at low speeds, but still under a fair bit of throttle and trying to accelerate.
We all brake very hard coming into corners, we all corner hard, and we all accelerate hard, even on rough mogulled trails.
I never used to be much into jumping, but with my 07 RTX I've been doing more and that includes landing with the track at a different speed than the ground (putting sudden torsion loads into the axle). I try to match track speeds reasonably well when I land, but if I'm trying to accelerate I don't match it perfectly (I try to match well enough to not get that loud drivetrain whine that occurs when a track lands under power). I guess we'll see if the axle breaks, but I might change it "just in case".
I think a built in slip clutch would make a lot of sense (if done right), especially with the RTX option. If you're riding at low speeds, take a big jump, and land hard on hard pack with the throttle wide open, the load sent through the drive shaft would be incredibly high. The only thing that can give a little is potential belt slippage, but Yamaha tends to run their clutches with lots of clamping pressure (so there won't be much slippage). This might be a good argument for running a highly tuned clutch kit where the belt clamping is "just right" for optimal acceleration. With just enough belt clamping so it doesn't slip normally, it would slip on a hard landing - saving the drive shaft from the huge torque that the engine's inertia is capable of.
My previous sleds also had clutch kits installed. The guys breaking axles were running stock clutching. My RTX's drivetrain is also 100% stock, including clutching...
mdkuni
TY 4 Stroke Guru
I see Mountain Performance makes a titanium drive axle. Anyone think it would be stronger? Might be worth the $$$?
http://www.mountainperformance.com/yama ... _train.htm
http://www.mountainperformance.com/yama ... _train.htm
ReX
TY 4 Stroke God
mdkuni said:
I just had a look at the web site and it looks like the titanium shafts have been discontinued.
number1kyster
TY 4 Stroke God
Has anyone broken one on a 07 yet? I am headed out for a 1k mile ride this weekend and I am very concerned about this shaft breaking. I have 4500 miles on my 07 RTX.
SharkAttak
TY 4 Stroke God
how many have broken? is it all in the same place?
number1kyster said:
Don't worry, they all broke between 6500 and 9000, so you should be OK. Mine broke at 6600, and last week, as precaution I changed it because I was getting close to that 6600 mark again.
Yummy
vx700xtc
Expert
99% probability that at some point that axle received a bit of a bump, rock, chunck of ice,rock hard mogul,etc, that created a minute stress crack that eventually resultted in the failure.
The world is full of drive shafts much smaller than that that are exposed to far more torque.
The world is full of drive shafts much smaller than that that are exposed to far more torque.
ReX
TY 4 Stroke God
vx700xtc said:
That might be what your dealer wants you to believe, but the failures I've inspected have been 100% slow growth fatigue failures.
Basically over the miles a small crack forms and slowly makes it way most of the way through the shaft. At some point it gets too weak and snaps when you get on the throttle or brake.
If there was a sudden impact, the axle would bend, not crack. These are not hardened enough to crack when overloaded.
vx700xtc
Expert
Is it at all possible that the slow growth fatigue was initiated by a slight runout, maybe caused by a one time impact to a not hard enough to remain straight shaft?
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