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I still think Brad's pulling a fast one on us. The build speed to quality ratio is amazing. We should have a video of the 2 minis racing in about 2 weeks, right?

Shh. Dont give away my trademarked secrets. That was an easy way to make a throttle return.

Heres a stock set up.

Good luck street legalizing a gokart. Why put money into an engine when you have plans to upgrade to a different engine family altogether? Can you weld and fab up the new mounts for said upgrades? How about some pics of what you have and we can help from there.

What was this engine going on Ed? I think 50+ in a street race kart would be fine. I get close to 50 in El Chingon and I back off cause its getting squirly. Another thing about stiffer spring, the stock valves dont hold up to the real high rate springs. They will tend to cup. Then you have to...

Non equal spacing. Gotta get all 3 rings clocked properly.

Im not sure about cam abuse, but the heavy springs are more about the valves following the cam on the closing side of the lobe. And I'll second keeping the stock cam for the low end torque curve.

Buy once, cry once.

Its seemed like a good idea after 12 garage sodas..... -denny

https://www.corsaracingkart.com/catalogo_ricambi.php?ln=&cat=41&categoria=DOUBLE%20BRAKE%20PUMP%20UNIT%20KF-KZ%20FR08&dis=41.png

So you cant even blame this one on the dog? Wow. 🍿

Is that an eccentric spring belt tentioner?

Im curious as to the gains on that. Make a new thread and post your findings. Your not changing duration, just opening the valve a little more. The overlap wouldn't change so theres no scavaging benefits. Maybe a slower intake velocity. Miniscule.

Multi length intakes are already a thing. They use butterfly valves to switch from a long runner at low rpm to a shorter one at higher rpm. Yes , finicky and prone to carbon fouling from egr systems.

Chrysler used a long ram intake back in the 60s on their land yacht cars. They needed all the torque and these old boats felt peppy because of it.

Yes, long intake runners have better low end torque.

Check the manifold. Sounds like an intake leak. Is it a rubber intake? Ive had issues with them. The mating flanges sometimes arent flat. Some carb clean sprayed around the area while the engine running will find that leak. Ive used the propane torch un-lit too. Just blow the gas around the area.

I put this one on mine. Its pretty comfortable and holds me in place when sliding the corners. Has the provisions for a harness if you desire. https://a.co/d/03RThoGK

I drilled more holes in my 40 driven like the 30. Gave the spring more tention. It holds low gear longer and will also light the tires up. You can see the holes here and the key trying to shear. Lol