Washer under valve springs to make them stiffer?

[JuraTyKokotko]

Washer under valve springs to make them stiffer? I heard a guy on some forum do this. Whats true behind this? Would this put more stress on the engine?

 

[Wrench]

Yes, a washer can be used as a valve spring shim. Yes, it will put more stress on the cam lobes, lifters, valve, and valve seats,
But everything should be OK,

But don't rush out and use a shim unless you have made serious HP upgrades,
To prevent Valve Float use a shim on the valve spring or get stronger springs

But a HS 49cc don't need the valve springs shimmed

 

[GW's Motorized]

If your cam lobes are plastic I strongly suggest you don't do this

 

[JuraTyKokotko]

Yes, a washer can be used as a valve spring shim. Yes, it will put more stress on the cam lobes, lifters, valve, and valve seats,
But everything should be OK,

But don't rush out and use a shim unless you have made serious HP upgrades,
To prevent Valve Float use a shim on the valve spring or get stronger springs

But a HS 49cc don't need the valve springs shimmed

I really feel like the floating valves slow me so much. The engine got a lot more power than it can output cause of the damm weak valves.
and ye i got the HS.

 

[Sidewinder Jerry]

I really feel like the floating valves slow me so much. The engine got a lot more power than it can output cause of the damm weak valves.
and ye i got the HS.

Have you tried setting the lashes? The HS 142 only produces 1.6 hp. With only this small amount of HP consider yourself doing good if you hit 30 mph on level ground.

 

[GW's Motorized]

Get a 3hp flathead

 

[JuraTyKokotko]

Have you tried setting the lashes? The HS 142 only produces 1.6 hp. With only this small amount of HP consider yourself doing good if you hit 30 mph on level ground.

Ye, i tried only the stock HS values 0.04 and 0.06 Should i trie the Honda values?

 

[Chainlube]

Just get some heavier valve springs, you're not going to hurt anything.

 

[JuraTyKokotko]

Just get some heavier valve springs, you're not going to hurt anything.

I dont think i can get any for HS142

 

[Chainlube]

I dont think i can get any for HS142

Yea, that would leave you with the only choice of making a couple of spring seats, aka: washers.
Some heavier springs might be available, have to ask around. Maybe @DieselTech or one of the other 4t builders???