EVSBRK18 Valve Spring 18lb CPR Performance Set Kit

 

I've been upgrading my engine to get the maximum speed since 4 strokes are pretty slow. I guess we shouldn't have tried to run it on a proper go kart track.

I thought the 18lb valves springs were only going to make the engine run more reliably at high revs, IE, no valve float.... Turns out (to my surprise)... that the new valve springs also make the engine run harder... (maybe this is because of the valve float... not sure)

IE,
Before the valve springs were installed the top RPMS at wide open throttle (no load) was, 5980rpms.
After the springs were installed, at wide open throttle (no load) was, 6700rpms... THAT'S HUGE.

I could not be happier. If I had've known that there is a direct relationship with increasing the valve springs and RPMs, I would've got the 26lb springs. The reason why I didn't buy 26lb springs first was because I thought it would wear out the cam much quicker... and I don't really have a plane to change the cam at this stage.

Lastly when setting the valve lash, I read up a lot and watched a tonne of youtube videos. I decided to try something a little different. The standard lash gap is

exhaust 0.003
intake 0.002

I decided to have less "slack"... this allows the valves to open earlier, and close later. I'm not saying it's exactly like changing the cam (since this is what a cam does), however it's like a poor mans way of simulating a new cam. The only thing it doesn't do it lift higher... l

exhaust 0.0015
intake 0.0015

Anyways... with all these changes (and only spending $39), I was able to increase my engines output by 12%.
That's friggen AWSEOME.