Oversized idler wheels? Any problems with using them?

[rxrider]

Installing larger idler wheels up front on the outside of the Monoshock skid can cause problems. If you go with larger wheels in this position, check weather your sled have the rail reinforcement kit installed or not, if not get hold of it and install.

Since these idler wheels do not sit on a cross shaft but are only attached to the rail with 1 bolt, the rail eventually bends inwards from impacts posed on the idlers. This will in turn cause the front tork arm to hit the highest part of the rail just behind the front idler wheels when the skid compresses fully. Eventually the front tork arm will crack.

At least this happened to my 2005 RX-1 Monoshock skid. I got all parts replaced under warranty and I do not have any problems with it now. With the rail reinforcement kit there should not be a problem going with slightly larger idler wheels. I still have the stock idler wheels in my Mono.

 

[whits-end]

Rex,

Not sure if this is relevent, but in the past I tried cast aluminum Kimpex Yammi wheels in pro-actions and they would not live at all. I switched to plastic Kimpex Yammi wheels and got good life from them. They will crack under severe impact, but maybe thus saves rails, etc.

 

[Len Todd]

I have the Pioneer Offset axles. If I had to do it again, I would go with the larger wheels versus the axle kit. On the front idlers, you really need to machine off, on the Yamaha mount, the 1/8" the Pioneer parts adds. After, a couple K miles, the wheels were turning the edge of the track down because they were out too far on the track (toward the edge.) If you just grind off 1/8" you have a heck of a time getting the wheels aligned again. The mounts have to be machined.

There are little brackets on the pioneer rear axle kit components. These little brackets are the rail reinforcements. This setup has worked well.

Actually, I am playing around with the original axle I took out when I put in the Pioneer axle. I added a couple oversize wheels and put it in between the front idlers. However, I do not know yet if this set up will allow adequate clearance for the rear shock, when it compresses. Has anyone tried this yet?

 

[mtkaboater]

I have been reading much about the 6 idler wheels on my 2006 Vector GT. These are the 130mm wheels with 25 mm id bearing. Wheels are crap - dealer already replaced them under warrenty when the originals delaminated. Now I put about 3,000 miles on the replacements and several are "wobbly" -- bearings are shot (but the wheel has not destructed like before). Of course these wheels from Yamaha are not the ones you can change bearing on - they are molded in.

Checked with the dealer and the replacement wheels are $54 EACH. Then started researching the issue here on TY. After reading much a bunch I thought I would order the Yamaha "Accessory" wheels that list for $22 part # SMA-8FP38-01-BK as mentioned on numerous posts here on TY. But dealer said they didn't have any in stock and that Yamaha was back ordered and didn't know when they could even order them - said to check back in a week.

Went to HP Engineering Catalog - no listing for my Yamaha.

Went to Dennis Kirk catalog, but it was unclear. Went to Dennis Kirk internet and it was wrong - had 2 different descriptions for same part. I called Dennis Kirk tech department and they agreed with me that listings were in error, but then they called their vendor (Parts Unlimited) and got the scoop and then called me back within an hour.

I ordered the part they told me to and they came today. I installed them and they are correct! It is 130MM outside diameter, 25mm inside diameter with a 6005 replaceable bearing (which Dennis Kirt does not carry, but is a common bearing).

The Dennis Kirk part number is: 06-646 and they cost $23 each bearing includied. I have to say that I GOT GREAT SERVICE FROM DENNIS KIRK TODAY!! THANK YOU!

See pictures below:

 

[ApexRtxGuy]

what is the part number for the polaris wheels? and is there anything else needed to put them on an attak

 

[4Fighter]

Not really a complete test, but I rode about 500 miles on Polaris idler wheels and did not have any problems. I later swapped them out of 05 Yamaha wheels so your results may vary.

During one of those rides, I ran into Kevin from Port Yamaha and we talked about the Poo idler wheels and how they were slightly bigger. His concern was that because they were bigger, you could damage the rails if you were to hit a bump right at the spot where the idler wheels connect. He does a much better job explaining this in one of the prior threads. I will try to find it.

As I've found out, you can damage rails even if you run the RIGHT wheels But I also talked with Kevin about the issue and went with the spoked acc. wheels. Haven't had a chance to put any miles on them yet.

 

[ApexRtxGuy]

TTT

 

[mckracker]

What bearings are in the Polaris wheels? The ones I have seen have the 6205 bearings. Thanks.

 

[skyhi]

THe numbers for the polaris wheels depend on what color you want. Yes they have 205 bearings that are larger and replaceable. I have a polaris skid and checked them against the yammie skid. They stick down the same amount on both applications. You will need to machine the yammie mounts in 1.5mm or .060" to keep the wheels centered with the larger whelel bearings. I did it, works great!

 

[mtkaboater]

I have now put 400 miles on the Parts Unlimited wheels (from Dennis Kirk) as discussed above in my previous post in this thread. They are a perfect replacement for the Yami wheel - and have a replaceable bearing - no need to use the POO wheel which you then have to machine the mount to get the wheel to line up correctly.

 

[01and02srx]

07 attack idler wheels

Can anyone help me why cant I loosen the locknut to remove and replace my idlers, the ones second back where the shaft continue on to the other side of skid?? The nut and bolt turn but how do I hold the bolt or shaft to get the nuts off??

 

[RedRX1]

I have had my share of wheel problems on 2 Rx1's, a total of 6 carrier wheels gone and 12 boggies. I just bought a mixture of the Yami accessory and standard OEM wheels without much thought based on what I could get quick to get back on the trail.

If you stop to think about it, the 1/8" larger wheels from others can't be an issue. As the hyfax wears the offset naturally changes. I never let it get to the limit, if I did that, it could cause a problem on a long ride. So...If' it is designed to work with fully worn hyfax, it should not have a problem with slightly larger wheels.

Next time i'm going for the larger wheels my buddies on Doo's use that never seem to have problems.

 

[quebec#1]

I have all polaris wheels from the original owner on my Apex with 5600 miles and the original slides.
I did put back the stock lower inside wheels because the polaris ones were missing chunks of rubber.

 

[thephast1]

Thanks for the pics and info mtkaboater. I just replaced the inner ilder wheel on my 06 apex, they were shot at only 2k miles. I bought the factory wheels $72 a piece, yikes! How have the new wheels held up for you?

 

[welterracer]

My rails are starting to bent inward from the larger front boggie wheels i have..