yamadooski
Extreme
I know this has been asked many times before but can't find the posts. I've got an Apex GT and RTX and need to upgrade the monoshock spring for my weight and riding style to prevent bottoming out. What is the part number and where should I get one? Also, is this something I should have the dealer install or can I do it?
Thanks,
Thanks,
ReX
TY 4 Stroke God
ReX
TY 4 Stroke God
I wouldn't call it easy to change, but if you have ever changed McPherson strut springs, you should be able to do this job also.
If not, it isn't difficult to take out the skid, remove the shock/spring assembly and bring just the shock assembly to your dealer for the actual spring swap.
Just an FYI, the monoshock spring force and pre-load is enormous compared to typical snowmobile spring loads. I have changed many springs on other sleds before (center and ski shock assemblies) by just compressing the spring by hand. There is absolutely no way this can be done with a monoshock spring. A decent spring compressor is absolutely required.
If not, it isn't difficult to take out the skid, remove the shock/spring assembly and bring just the shock assembly to your dealer for the actual spring swap.
Just an FYI, the monoshock spring force and pre-load is enormous compared to typical snowmobile spring loads. I have changed many springs on other sleds before (center and ski shock assemblies) by just compressing the spring by hand. There is absolutely no way this can be done with a monoshock spring. A decent spring compressor is absolutely required.
The GT has a nut adjuster, which can be spun away from the spring and gives plenty of room to take off spring collar.
Don't know about the RTX......
Don't know about the RTX......
ReX
TY 4 Stroke God
Sorry I missed the years and models.
The spring #s in the link I gave you are for the 06, 07, 08 Apex ER, 06, 07, Attak, 08 LTX, 05 RX-1, 06 RTX...
But - not for your particular models. You have the "special" models.
The GT uses a Ohlins shock and a completely different set of springs. You should be able to search here and find the part numbers for the different springs. You still need the same tools and procedure to change the spring.
The 07 RTX uses a coil over shock for the center spring, but also uses two torsion springs at the rear of the skid. The torsion springs carry the majority of the load, but unfortunately Yamaha does not offer optional torsion springs that reduce the bottoming out. They do offer a "heavy duty" spring, but while it is stiffer and lowers the sled at the same time. Possibly useful if you are looking to improve the handling by lowering the sled. Unfortunately the bottoming resistance is about the same as the stock torsion springs.
For the RTX you can install a pair of antibottomers. These make the effective spring rate increase for the torsion springs when it gets close to bottoming out. They do help to reduce bottoming, but they also generate annoying kickback since the shock isn't calibrated to work with them.
For the RTX, your best be is to read through other posts on the issue. There are other options like having the stock springs rearched, but I'd read up on the options carefully before making a decision.
In reality the best thing you can do to improve bottoming is have the shocks revalved to stiffen them up, especially the high speed damping. A well valved shock will maintain a compliant ride fairly well while improving the bottoming resistance considerably.
The spring #s in the link I gave you are for the 06, 07, 08 Apex ER, 06, 07, Attak, 08 LTX, 05 RX-1, 06 RTX...
But - not for your particular models. You have the "special" models.
The GT uses a Ohlins shock and a completely different set of springs. You should be able to search here and find the part numbers for the different springs. You still need the same tools and procedure to change the spring.
The 07 RTX uses a coil over shock for the center spring, but also uses two torsion springs at the rear of the skid. The torsion springs carry the majority of the load, but unfortunately Yamaha does not offer optional torsion springs that reduce the bottoming out. They do offer a "heavy duty" spring, but while it is stiffer and lowers the sled at the same time. Possibly useful if you are looking to improve the handling by lowering the sled. Unfortunately the bottoming resistance is about the same as the stock torsion springs.
For the RTX you can install a pair of antibottomers. These make the effective spring rate increase for the torsion springs when it gets close to bottoming out. They do help to reduce bottoming, but they also generate annoying kickback since the shock isn't calibrated to work with them.
For the RTX, your best be is to read through other posts on the issue. There are other options like having the stock springs rearched, but I'd read up on the options carefully before making a decision.
In reality the best thing you can do to improve bottoming is have the shocks revalved to stiffen them up, especially the high speed damping. A well valved shock will maintain a compliant ride fairly well while improving the bottoming resistance considerably.
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