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One of my buddies sent me a PM asking about Rear Sprocket alignment problems and what could be the cause. Since others may be in a simular situation, here's my reply that might help you too...

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Most minis don't come with a grease fitting in their main Swing Arm bar. They are loaded up with internal grease at factory then "good to go" for a few years . If your mini does lots of water riding or extreme racing, this grease is most often pushed or washed out in very little time. Thus, the bushings within the Swing Arm wear. Dramatical wear on its bushings and thus, inconsistant Chain Alignment.

To allow you to add more grease, simply install a grease zerk within the Swing Arm's main bar. For best results, its wise to remove the swing arm, drill the hole, wipe off the drill bit shavings, install the grease zerk, reinstall the swing arm, then pump in the grease - until it comes out one of the ends of the Swing Arm. For me, I crawled under our mini and drilled the hole upwards. I'm sure 99% of the shavings fell on my face. Note: Wear safety glasses for this job. Either self tapping or Push-In grease zerk type will work. If you want more threads on the grease zerk, drill a larger hole, then weld on a concave grounded Nut. A Nut with the same thread size of the grease zerk. What ever works best for you....

For pictures, surf: http://community.webshots.com/album/284538349PdZJcL

Finished result: http://community.webshots.com/photo/...84541087LaRFko

Note: Not too sure if I'd install another grease zerk in the rear hub area again. Lots of work for such little gain - for this specific location. But, I would install another grease zerk in the Swing Arm's main bar again. That one was well worth it. To me, they should all come factory with a grease zerk in this location.

Hope this helps....

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That's a good idea, but you shouldn't drill it on the bottom because it could get ripped off running over rocks and ruts. Just take it off, that way you can also be sure not to get any shavings in there on final assembly.

 

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Agreed. Installing the grease zerk in a protected area is a good idea.

Before removing the Swing Arm (for best results), clean the main swing arm bar, place a 1" long masking tape in the center and hold the end of your grease gun to this location. Then, mark the tape with a marker. This is done to find the "most comfortable position" when greasing the future grease zerk. I installed my Pred-90's grease zerk pointing downward. From a white board perspective, great location. But... What a pain in "my tail" to reach it with my little grease gun. If the grease zerk was on an upward 45 degree angle, it would have been much better. re: less pain my "my tail".

What ever works best for you....

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Hows pred 90 go? I was thinking of getting one for my daughter. Does it respond well to mods so I can make it faster as she learns better. I'm not going to get her a 50 cause even though she's only 7 she's almost 4 and a half feet tall and 73 lbs. (I'm the runt of my family at 6'1" 220 lbs) plus she has the bomb 90 at her mom's

 

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Sparky8370, I sent you a PM. Hope this helps....

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From a high level perspective, the Pred-90 is the same as the other 2 stroke CVT minis. Being a 2 stroke, they are very easy to upgrade its engine (from stock to xxmm Cylinder), from 100-120 PSI to more PSI, easy to change their chain, easy to change their sprockets, easy to change brake pads, easy to install a Chain Tensioner, easy to install a skid plate and easy to change/improve other areas. Each brand has their slight design differences but from a high level perspective, "Moding" each brand is the same. Especially for trail riding when 100% performance output isn't mandatory. My profession is to pump out / update project plans, schedules and budget crunching. Yes, a "paper pusher" who sits on their tail on day long. If someone like me can do these upgrades to a mini, then many others can too. They just need the learning time and confidence to "go slow" and learn as they go along.

Will the Pred-90 take mods easy??? With guidenance from Billy Holt at WRH Racing, Markvette and a few other Specialists, I (actually, "we") were able to upgrade our Pred-90 very easy. Each performance part "fit" on first try. No fuss / no muss. Just needed the extra time to personally learn how it's done. And I'm sure it would be "no fuss / no muss" on the other brands of 2 stroke / CVT systems as well. That being said, I'm sure each of them would have helped me at the same level with any brand of mini we bought for our family.

Hope this helps....

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