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Old 09-11-2010, 09:41 AM   #1
Ayrton Mutagaana
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Default Setup suggestions for Birel R30

Hello I'm new to the forum but not to karting and just have a few setup questions about the R30. What would be a good baseline setup wiht a 50mm axel (B) and a Yamaha KT100 engine setup (Jr.can). I think we have a good base but I just wanted to see what other things we have not thought to try. We are running the YKC Bridgestones currently as the spec tire at our local club. Ill be open to any setups your willing to share.

Thanks in advance,
Ayrton
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Old 09-11-2010, 09:54 AM   #2
Marc Miller
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Hi there.... this information can all be found in the R30 baseline thread above... here is the link:

http://www.mrpmotorsport.com/communi...ead.php?t=1834

....and here is the best info for your application:

50mm vs 40mm axle tests...we have yet to put a 40mm axle in the RY30S1 because we haven't felt the need to do so. The kart works great right out of the box. We have tested both 40 and 50mm axles in the RX30SE and the R30CY and prefer the 50mm axle.

When WKA first allowed the 50mm axle in competition we were skeptical if the average Jr. driver would be able to make the 50mm axle work. We compared the 40 to the 50 in many different conditions with multiple drivers and have found the 50 to be better EXCEPT when there is no rubber on the track. When there is no rubber on the track the 50mm axle seems to be a little too stiff and makes the rear of the kart slide whereas the 40mm axle is much softer and it allows the kart to "work" better. With the 50 mm axle this can be overcome by raising the rear of the kart, pulling the seat stays, removing the front bar and removing caster until the track starts to build a bit of rubber on it. Once the track comes around you can start moving towards the baseline set up again. Hope this helps.

R30CY w/ 50mm Axle
1040x50x2-F, middle bearing tight, 100mm hubs at 54 1/2" wide, one seat stay each side, front bar in, spindles in the middle, 75mm front hubs set two thick and one thin spacer wide, 2mm toe out, camber will be between 0 and 2mm positive. Freeline seat mounted at 60cm from the front rail to the front edge of the seat, top of the axle to the top of the back of the seat 22cm, bottom of the seat should be 3-5mm below the frame rails.

R30CY with a 40mm axle and 6.0 YHC's: 1040x3 F axle, middle bearing tight, 100mm hubs set at 23 cm from the cassette to the end of the hub, front bar in, spindles in the middle, central pills, 17mm spindles with 75mm hubs set at 2 thick and one thin spacer wide.
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Old 09-11-2010, 11:37 AM   #3
Ayrton Mutagaana
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Thanks for your help sir i really appreciate
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