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1) Yes, a longer video clip is coming up. 2) Yes, I designed and built the kart. The design goal is to have 4-wheel independent suspension along with a single wheel drive to bypass a differential axle. 3) I am not sure what you mean but the bouncing involves both the shock and the swing arm...

For those of you eager to scrutinize a longer video clip, yes I will make one. Perhaps, one with a speed meter. Hopefully, with go kart gurus around the globe, this problem will eventually be solved.

I thought that is British spelling:smiley_omg:

The drawing related to rear swing arms is correct. Here is something to ponder. The driving wheel has an 1 inch shorter arm compared to that of the right non-driving wheel. A shorter arm should have bounced more frequently than the non-driving wheel's arm under the same load. However, the...

The reason I installed a 19" long JS is because I want the engine to sit in the center. The bang is caused by the bouncing. If the bouncing goes away, so does the bang.

This is new in this thread. You are the first one questioning about the JS and clutch. I believe JS is fine but clutch might be it. Should clutch were the problem, that would explain why the bouncing only occurs in low RPM. The clutch used in this go kart is Hilliard #35, 3/4, 12T. If that is...

The chain I installed is #35. Some one posted about the strength of chains, and did not think the problem is coming from the chain. So the discussion was directed to the swing arms.

For those think the bearing load on the driving wheel is too light. It's not true. 1) I stepped on the driving wheel (165 lbs) but the problem is still there. 2) The driving wheel actually is purposely set to be slightly lower than the plane formed by the other three wheels, i.e., the driving...

I did and even stepped on the swing arms but it was still bouncing. Now, can you think of anything pertaining to the engine: low RPM -> bouncing, high RPM->fine.

I think it is just a spring not really a strut within. So you have one in mind to suggest.

Just keep you posted that the swing arms are fine with that "offset". The chain is perfectly aligned with the arms when they move. The bang from the chain was caused by the bouncing tire. The bouncing problem, I guess, is caused by the engine in low RPM.

The chain is a bit loose but as long as it stays on track I am happy. The HF 212cc engine might be a problem. Should I change the motor? What do you suggest?

Updates The problem is still there when motor speed is slow. When motor speeds up, it is gone. So the bouncing may be from the motor. I figure the offset of arms is fine. The chain on the swing arms are perfectly aligned (check Math). Now, why the engine causes that? Note:I original want to...

Ok. I will realign the pivot, and this problem may be gone.

Good findings. My original intent was to absorb 2" movement of the shocks. It looks like it is not working:oops:

I did a test by placing a solid bar instead of the shock but it does not help at all. Would you please provide a link to the spring loaded tensioner you mentioned.

Here comes the video: https://www.youtube.com/watch?v=J7awOCmhbZI and https://www.youtube.com/edit?o=U&video_id=k6mpGjTg1Ok Updates: I found the chain is a bit loose. There is no chain tension adjustment. I plan to add some, and replace the #35 to #41. I feel the chain may not strong enough but...

Updates: I replace the shock with a stock but it does not solve the problem. The chain I used is #35. Would #41 solve the vibration and bang problem?

I will try to replace the shock with a stock later. Updates: I step on the driving wheel york (I am 165 lbs) but the problem is still there:surrender:

This is what I suspect too. When the wheel is off the ground, the driving force is fully applied to the sprocket. At the moment when the wheel touches the ground, the friction causes the sprocket and the chain to kick and make a bang along with shacking/vibration. I did a similar test by...