MOPED ARMY

Doppler spring is probably too stiff for your set up, it is far too stiff for most.

Cool, Thanks for the help guys i'll remove the doppler spring and see how it goes. why all those weighs if you only need ligther ones?

it's always going to grab the belt at idle, since there isn't anything holding the sheaves apart it's going to try to close when its spinning. as long as it isn't trying to move the bike it's fine.

with a heavier spring you will need heavier weights than if you had a light spring.

with a lighter stock spring you need lighter weights. this has the advantage of causing less drag on the belt. the downside is that the variator can close too quickly and drag the engine towards the pulley and the engine can bounce. also since there is less spring force when you slow down the variator wants to stay closed. that's why you use a launch lever, to hold the engine when you launch the bike and to push it back when you slow down/enter a corner

with a heavier spring you won't have these problems but you need heavier weights to counteract the spring.

you are not using enough weight. the bike in the picture has about 6.5 gram on each arm. with the doppler spring you need more than that. I only ever used the stock spring so I use more like 8 gram on each arm. so you need more for sure.

I made a spreadsheet a while back of all the weight combinations+screw weights in grains, there is a similar table in the wiki but it is way off, the weights are wrong, also there are actually 4 different size doppler weights, and it doesn't account for the screws.

if anyone is building a launch lever

please take pics step by step...

i'd be interested in that work up.

You built the wrong bike if you were looking for low rpm grunt.

Variator tuning at WIKI ,Ross.

Its much more suited to everyday riding without a launch lever. I think the stock spring with the bracket shimmed out would be fine on your set up.

Could probably find the right size spring at ace hardware

So what you're saying is that you want a clutch? Your bike doesn't have one.

i would like full varation but no grab untile i am in full power band

Go back to the stock spring and stuff it so you have some tunability in the counter spring. Trouble with the aftermarket compression springs is that they are not progressive springs, so you can not really tune the preload.

Do a Google search for adjustable model airplane shock absorbers they're the sweet ticket and with the adjustable dappening you won't get goating.

Works great as an addition with the stock spring that is if you haven't lost all the parts har har

old bump for a question like that, you can use gas shocks from McMaster, there is a wiki article about it.....

Or maybe its a thread? I dont feel like digging right now

That’s what I run!

Rivertwostroke was the one that used a gas shock first but he cut some off the frame in the process!

I was able to avoid cutting the Frame, I’ll post a pic of it when it’s back together! I had to weld up some mounts, I also have my motor hanging on mount so the carb has room to clear the frame!