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View Full Version : rear wheel's knocking during slow roll



nashuanuke
09-21-2024, 01:58 PM
Problem solved: I'm a little embarrassed but in the night I realized I hadn't fully checked the coupling, woke up and checked the shaft coupling and sure enough it interfered with the frame by just a millimeter. So I was gouging a bit of the powder coat and surface every half rotation. The solution was immediately apparent, the transmission mount spacers were mounted on the wrong side of the mount, weren't doing anything. I fixed that and applied some paint to the gouged area, wheels are spinning freely now.

I've got IRS and I'm attempting my first go-kart. When I put it into gear and move the rear wheels about every half rotation I feel the rear shudder. I've only pulled it about halfway out the garage then back in because of it. Could that be just that the tires are badly aligned or is there something more serious, perhaps with the differential? I've only eyeballed the alignment based on the measurements in the instructions until I can get a more professional one done. Looking at everything in the rear nothing seems off, everything is tight and doesn't appear to be interfering.

michael everson
09-21-2024, 02:32 PM
Are the wheel balance weights hitting the calipers?
Mike

nashuanuke
09-21-2024, 03:59 PM
Are the wheel balance weights hitting the calipers?
Mike

good guess, I don't think so, I've got the 11.65" brakes so they're not pushing the limits, I felt around the wheel and there seems to be a decent gap

michael everson
09-22-2024, 06:38 AM
Ok I would check the fit of the disc to the spindle. I recall having an issue whether the center bore of the disc was too small causing the rotor to go on crooked.
Mike

cob427sc
09-23-2024, 08:15 AM
Mike's idea is right on. Also check the torque on the wheel lugs and the center of the wheel itself as it mates against the disc. I have had 2 problems in the past, one with the lug nuts not setting tight against the wheel as they were acorn nuts and the stud bottomed in the nut before it was tight and the second was when the wheel center casting (after market wheels) hit the axle center and would not allow the wheel to pull up tight to the axle facing.

rich grsc
09-23-2024, 10:03 AM
Mike's idea is right on. Also check the torque on the wheel lugs and the center of the wheel itself as it mates against the disc. I have had 2 problems in the past, one with the lug nuts not setting tight against the wheel as they were acorn nuts and the stud bottomed in the nut before it was tight and the second was when the wheel center casting (after market wheels) hit the axle center and would not allow the wheel to pull up tight to the axle facing.
Read the OP's comments. It was the driveshaft hitting the frame, problem fixed

CraigS
09-25-2024, 06:55 AM
Great troubleshooting. Glad you found it.