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GrossGraphix
05-28-2012, 09:36 PM
I have recently gotten a buggy off a guy here on mini buggy forum. It is the ST4 buggy. Iif i want to make the suspension have more travel what would a person need to do? Im sure its not as easy as just buying another set of fox shocks that have a longer length of travel. Correct? I do know some things about suspension. I just have been out of the game for a while so need some refresher course just to make sure im on the right track.

So far i love the buggy. I am hoping to get the shocks filled to the 500 psi Tuesday/ tomorrow and have them back on the buggy. Looking to swap the 15/45tooth sprockets for a 13/54 tooth sprockets. As of now it does not have anything for low end power. Its a FZR600cc engine.(will hopefully some day run across a deal on something bigger and swap it out) I have made it to 4th gear the way it sets but it struggles to have any power at all. Have to keep the rpm crazy high. Looking to swap the hand clutch and put a pedal clutch. I hooked up the gauges to the harness and it didn't light anything up so im guessing its not good. I have not tested any of the wires yet to make sure there putting out any voltage yet though.

Stomper
05-28-2012, 10:43 PM
I am definatly not an expert on the subject or know that much about suspenssion for that matter. But I do know it will depend on the max angle of your cv's among other things. It should be doable as long as the geometry is correct.

bdkw1
05-28-2012, 10:58 PM
500PSI in the extended position is A LOT in a fox air shock. If the ride height is ok and it's bottoming, your oil level is off........

Off the top of My head I think the max your supposed to run with standard oil height is 400PSI.

MC@ Performance Fab
05-29-2012, 11:09 AM
The 15/45 is way to much gear the 13/54 would be much better, maybe even more. It all depends on tire size and what type of driving your going to be doing. Changing the gearing is not going to change the motors powerband, it is what it is. Personally I would never use a 600 in a buggy. More wheel travel is likely to be a lot of work and money.

GrossGraphix
05-29-2012, 12:05 PM
Yeah would rather have a 900cc or bigger in it but that what came with. So gotta make do until something else falls into my lap lol. I dont have any problems with the fox 2.0 shocks yet not been out rideing it hard enough or hit big enough jump to fully utelize the suspension yet. Was just curious. I could of swore it said fill to 500psi too in the st4 plans. Ill have to double check here after work. Went to local power sports store. They could not get a oversized sporcket for me. So going to have to resort going to the net to find one.

MC@ Performance Fab
05-29-2012, 12:47 PM
Sprocket Specialists.

ProtoDie
05-29-2012, 03:59 PM
Max is 500 psi on 2.0 airshox

You do not want to run there though

Max the oil out & run 200-300 psi depending on environment you are driving in

as posted earlier, CV angle will limit the rear travel
Front, could be tie rod heims angle,,,,not sure how the ST4 is setup there

Cycle your suspension with out shocks and check your limits, then decide if you can run a longer shock.

Also keep in mind what full compression length of your shocks are,,,and keep a few inches of ground to frame clearance.

2fast4u
05-29-2012, 06:08 PM
i think i have a pic of a dyno chart of your engine on my thread. u can use it to match up the proper gear ratio for you tire size. id measure your tire size yourself and not just go by the #s on its side wall.

most people with 600s seem to be very pleased with a 13t up front and a 60th out back.

as far as getting more travel... you should post some good pics up of what ya have now. front and rear bottomed out and at normal. it would also help you to do so with a degree wheel/angle finder.

dont forget to show us some vids. y o u tube and photo b u c k et are good places to do so and make it easy for you to copy and paste here.


good luck and have lots of fun! the st4s are NICE!:D

GrossGraphix
05-29-2012, 06:25 PM
Thanks guys. I managed to get shocks filled today after work on way home. Now that im home and read ProtoDie's reply maybe i bit myself in the butt lol. I had them filled to 450psi. Guess i can always take them back and have them taken back down to 300 abouts if i dont like them at there current state.
I seen somewhere on the net and now i cant find it again to save my life. I found some where they had a split rear sprocket? Anyone have a go to site that they buy all there sprockets from?

The tire height that is on the buggy now measureing from ground to top of tire is 24" plans call for a 26"

ProtoDie
05-29-2012, 08:54 PM
Thanks guys. I managed to get shocks filled today after work on way home. Now that im home and read ProtoDie's reply maybe i bit myself in the butt lol. I had them filled to 450psi. Guess i can always take them back and have them taken back down to 300 abouts if i dont like them at there current state.
I seen somewhere on the net and now i cant find it again to save my life. I found some where they had a split rear sprocket? Anyone have a go to site that they buy all there sprockets from?



been using speedpartz.com for years. split alum sprockets

Get your self a 400 psi gage for tanks and hook it up to a small hose with a tire fill end.

This is what we use for a quick check on the shocks.
you can then bump it down and check the pressure quickly.

if you don't have a nitro tank and go too low,,,your out of luck.

we always have a tank to pump it back up if we go too low.

I actually charge them too high and then bump them down with the hand gage

GrossGraphix
05-30-2012, 11:57 AM
been using speedpartz.com for years. split alum sprockets

Get your self a 400 psi gage for tanks and hook it up to a small hose with a tire fill end.

This is what we use for a quick check on the shocks.
you can then bump it down and check the pressure quickly.

if you don't have a nitro tank and go too low,,,your out of luck.

we always have a tank to pump it back up if we go too low.

I actually charge them too high and then bump them down with the hand gage


yeah i have been thinking of getting like a small portable tank possibly for filling. Thanks for the website info. Put front shocks back on last night. Its still up on the stands. Waiting for my sprockets to come in. Then ill put it back together and see how it feels at the 450psi and go from there i guess. Ill definatly check out the website thanks.