[Clint Williams]

Luis- thank you for providing that resource.

 

TJ- thank you so much for chiming in, this is exactly what I was wondering. You’re awesome!

[Clint Williams]

Thanks Walt!

[Clint Williams]

Jay-

 

I am running 219 for clearance between the rear sprocket and rear cross rail on my new frame. (Smaller chain and smaller diameter sprockets) On my old frame I had more clearance and had no issues running #35 chain. I am using split sprockets inboard.

 

I just didn’t know if it was acceptable to add/remove links as needed or if it would be better to just make seperate lengths of chain for each ratio combo.

[Clint Williams]

*relationship of caster and front track width

[Clint Williams]

Gary and TJ, thanks for all your help thus far in helping me out. Last weekend I was able to put in a 40 mm axle and my buddy had some offset pills that come in .5mm, 1.1mm, and 1.6mm steps. I put the .5mm pill in to start with.

 

The tires all around cleaned up but now it is on the other end of the spectrum and is bogging down at corner exit and the engine started to get hot from binding.

I set the rear track width to 53″, fronts have one small spacer inside, one seat strut from left side of seat to axle carrier, .5mm pill and the plastic bumper was tight from trying to stiffen up the rear with the 30mm axle.

I asked a regular podium finisher in my class if he could take some laps and he confirmed my initial feelings of the kart and turned about the same lap times I did (which are .7-1″ off target lap times at this track.) He suggested loosening the rear bumper and possibly removing the seat strut to help free up the rear.

I was also thinking of narrowing rear track width a tad to help lift IR and moving some spacers in on the front and trying the 1.1mm pill. And maybe trying some shorter hubs. I am not sure where you take measurements from to determine hub length but they are definitely longer than the hubs than were on the 30mm axle.

 

Am I heading in the right direction with freeing up a rear a tad? I am still a little confused with the effect and relationship of front track width. Do you typically increase caster when widening the fronts or only one or the other?

[Clint Williams]

<span style=”background-color: rgba(255, 255, 255, 0);”>[URL=http://s288.photobucket.com/user/ClintWilliams/media/Mobile%20Uploads/image_zpslg7in1bz.jpg.html][IMG]http://i288.photobucket.com/albums/ll186/ClintWilliams/Mobile%20Uploads/image_zpslg7in1bz.jpg[/IMG][/URL]</span>

<span style=”background-color: rgba(255, 255, 255, 0);”>[URL=http://s288.photobucket.com/user/ClintWilliams/media/Mobile%20Uploads/image_zpsjpkp2rq6.jpg.html][IMG]http://i288.photobucket.com/albums/ll186/ClintWilliams/Mobile%20Uploads/image_zpsjpkp2rq6.jpg[/IMG][/URL]</span>

Can I adjust caster and camber with this design? I haven’t taken it apart but it looks like I can only adjust ride height as the bumper mounts to the king pin bolt.

 

this is

[Clint Williams]

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<span style=”background-color: rgba(255, 255, 255, 0);”>[URL=http://s288.photobucket.com/user/ClintWilliams/media/Mobile%20Uploads/image_zpsfru2akrw.jpg.html][IMG]http://i288.photobucket.com/albums/ll186/ClintWilliams/Mobile%20Uploads/image_zpsfru2akrw.jpg[/IMG][/URL]</span>

 

[Clint Williams]

TJ and Gary- a buddy is letting me try out a 40mm axle this weekend. I hope these pictures upload okay, but I was trying to show the tire wear.

The rear is the right rear on a counter-clockwise sprint track.

 

The front is the left front on the same track. the right front is wearing evenly across the tire. Someone at the track suggested that the uneven front tire wear might be indicative of a bent spindle or frame?

[Clint Williams]

Thanks for the responses Gary and TJ.

Which hardness 40mm axle should I try out first?

So I understand it correctly, moving to a 40mm rear axle will flex less than the 30, transferring more weight to the rear tire and correct the over steering issue?

As for rear track width, if I want more rear grip do I widen or narrow?

And for hubs, long hubs provide more weight transfer by stiffening the axle and short hubs opposite?

[Clint Williams]

YLC- not YHC

[Clint Williams]

http://www.baileyracing.com.au/go_kart/ar4xfolder/ar4x.htm

[Clint Williams]

Bridgestone YHC is the spec tire for the class- WKA Gold Rush West Coast Series. Min weight is 360- I weigh 147 so I had to add a good chunk of ballast to make weight. The guy I bought it off of placed third or fourth in the series the previous season with the same setup. He weighed about 160ish.

I am pretty sure the current AR series Birel’s are made for junior classes, but this older one is I think an introductory, lower hp chassis: http://www.baileyracing.com.au/go_kart/ar4xfolder/ar4x.htm

 

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