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Gearing help needed.

ATVs

 
 
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  #1  
Old 06-04-2008
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Default Gearing help needed.

I need to adjust the gearing on my sons ATV. It's a chinese made quad, sorry but it had the price tag I wanted lol. It's suppose to be a 110cc but performs like a 90cc. It's always spun the tires on takeoff and it's a pretty quick quad for his little 50 pound ass. Well the tires were almost bald and he needed bigger tires anyways. Original tires were 13" tall, we installed 16" tires on it. No longer will it do a burn out and it's pretty slow out of the hole now. I think this is a big reason he got beat at the drags. With the 13" tires it was about perfect and I'd like to achieve the same gearing for the larger size. I need someone to give me a math lesson lol.

Original setup
13" Tires
13 Tooth front sprocket
37 Tooth rear sprocket

What do I need to change to return to the same gearing with 16" tires?
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  #2  
Old 06-04-2008
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I checked to see what gearing was on name brand quads....
Honda TRX90
20" tires
13 Tooth front
50 Tooth rear

Suzuki z80
19" tires
13 Tooth front
50 Tooth rear

I didn't expect their rears to be so many teeth, wow. If anyone is curious this is the quad my son has http://bargainquads.com/detail.cfm?id=466. It's been a great quad and we haven't had any problems with it since we got it, just over a year ago.
I'm seriously thinking about selling this jap thing and getting him a suzuki 80, looks the same as my 400 too lol.
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Rich
"Do not go where the path may LEAD, go instead where there is no path and leave a TRAIL"

Quote:
Originally Posted by Rubi View Post
Nobody on this site likes Ski Doo except Dirty Harry, and he's better at making babies than buying or fixing sleds, so you don't want to listen to him.
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  #3  
Old 06-04-2008
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We have those 200's here at my work.. someone bought up someone's inventory of them. The name on the is KTM though, we were dumping them for $750 or so. I can check and see if we have any left?!?!?!
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  #4  
Old 06-04-2008
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Have any left? Dude I already have one don't need another lol. I actually just went to look at kawasaki and suzuki 90s. I'm just not sure if I want to buy him another quad when there's really nothing wrong with his. I just can't get parts for his whenever it finally breaks down. I almost bought him a suzuki when I got my quad, been regretting getting the jap ever since.
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Rich
"Do not go where the path may LEAD, go instead where there is no path and leave a TRAIL"

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Originally Posted by Rubi View Post
Nobody on this site likes Ski Doo except Dirty Harry, and he's better at making babies than buying or fixing sleds, so you don't want to listen to him.
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  #5  
Old 06-04-2008
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Sometimes the parts from those knockoffs are molded from the originals. Something to keep in mind. You may be able to find an enthusiast site like this for them.
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  #6  
Old 06-04-2008
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Most of the parts on them are made or copied from Honda.
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  #7  
Old 06-04-2008
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I've been looking at parts for honda. I was originally told that like you said they are made as honda copies. The engine is different than hondas though. I'm trying to match it up according to looks and can't quite nail it. Honda 90cc is pretty similar but I'm hesitant to spend $200 on an exhaust system for a honda 90 not knowing if it'll work or if it'll even improve performance.
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"Do not go where the path may LEAD, go instead where there is no path and leave a TRAIL"

Quote:
Originally Posted by Rubi View Post
Nobody on this site likes Ski Doo except Dirty Harry, and he's better at making babies than buying or fixing sleds, so you don't want to listen to him.
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  #8  
Old 06-30-2008
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Well I still haven't changed his gearing but I did mod a pipe to fit. I ordered a slipon white brothers pipe for a trx90 and it wouldn't fit onto his stock header. So I ordered a used head pipe off a trx90, it fit but stuck out the back fender about 10". I ended up cutting his stock header pipe and shortening it about 5 inches, I added a 45* angled piece off the trx90 pipe. Welded it all together and welded a mounting tab on the frame for the slip on muffler. It sounds tits!! Not too loud and has a nice deep throaty sound. He loves it, he's been brapping the throttle so he can hear it lol. The power difference was very noticable both watching him rip and with my big ass on it. I also installed a k&n filter directly onto the carburator. I ordered a wiring harness and high rev box for a trx90 so I'll have to redo the wiring to work for the different rev box. It should be very noticable for the next races on July 13th. I'll get some pics tonight and post up tomorrow.
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Rich
"Do not go where the path may LEAD, go instead where there is no path and leave a TRAIL"

Quote:
Originally Posted by Rubi View Post
Nobody on this site likes Ski Doo except Dirty Harry, and he's better at making babies than buying or fixing sleds, so you don't want to listen to him.
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  #9  
Old 06-30-2008
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i'd go with a 39 tooth rear sprocket.

is that little thing manual clutch or belt to chain drive?
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  #10  
Old 06-30-2008
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3speed with automatic clutch. I want to swap in a 42 tooth rear sprocket but having a hard time finding one. I've found a couple places that make custom sprockets, I think I'm going to have to measure the mounting bolts and call them.
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Rich
"Do not go where the path may LEAD, go instead where there is no path and leave a TRAIL"

Quote:
Originally Posted by Rubi View Post
Nobody on this site likes Ski Doo except Dirty Harry, and he's better at making babies than buying or fixing sleds, so you don't want to listen to him.
Reply With Quote
  #11  
Old 06-30-2008
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thing must have veru small internal ratio's i run a 14/49 on the yz, and that's even taller gearing then my bike
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she was all hongry and shit.
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  #12  
Old 06-30-2008
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why r u tiping like CYI tuday?
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  #13  
Old 07-17-2008
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Here is a picture of Shane's quad with the custom exhaust. It sounds pretty good but I don't have any clips of it. I actually have someone coming to look at it tonight, we're upgrading him to a kawasaki kfx90.
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Rich
"Do not go where the path may LEAD, go instead where there is no path and leave a TRAIL"

Quote:
Originally Posted by Rubi View Post
Nobody on this site likes Ski Doo except Dirty Harry, and he's better at making babies than buying or fixing sleds, so you don't want to listen to him.
Reply With Quote
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