Current thinking on reed blocks for a YPVS

[ringdingding]

Hi
What's the current best set up for the reed blocks on a road going / lightly tuned 350 YPVS motor?
Standard, standard different petals, or VForce

[stasky]

had v-force,bit expensive,banshee reeds are fibre reeds as standard,and not too expensive from yamaha new,and obviously fit the ypvs cages,not tried boyuesen recently,but my bike goes really good with the banshee ones

[JonW]

Hy-tech were just copies of the banshee reeds i think, I assume you can still get em? just get the banshee OEMS. thats what i do.

Boysen trap doors will never open the larger petal. Thats a no from me.

VF4s is what i would suggest.

There are others out there. TDR does petals and Wicked was doing a nice cage setup I think as well (also with custom TDR reeds I suspect).

[Tobyjugs]

If you look at a VF reed block construction you will see a small round hole at the entrance which then opens up where the reeds are. This is a form of stuffing. I have done the same to a pair of YPVS reed blocks using the Yamaha resin petals Norbo sells and a 2K putty (similar to JB Weld). This mod used with an inlet manifold which tapered from 26mm diameter carb side to 28mm reed block side gave a good boost to performance.

Stuffers are regularly used in 2 stroke cross engines.

I never correctly measured it but i think it gave an extra 4-6 pk extra

You can find the stuffers pre made made in aluminium at the sip scooter shop. I have no idea how these work as i made my own and found these later.

[lc350pete]

Forgive my ignorance 😳 but are the banshee ones carbon fibre and the std Yamaha ones white nylon ?
My bike came with carbon fibre ones when I bought it a long time ago, don’t know what make they are.
But I ought to replace them with new while it’s all apart anyway just not sure what to get
It’s a std 31K bike just polished the ports a bit , large can Allspeeds and F2 Powerjet carbs

[stasky]

Sept 28, 2020 8:08:44 GMT 1 lc350pete said:

Forgive my ignorance 😳 but are the banshee ones carbon fibre and the std Yamaha ones white nylon ?
My bike came with carbon fibre ones when I bought it a long time ago, don’t know what make they are.
But I ought to replace them with new while it’s all apart anyway just not sure what to get
It’s a std 31K bike just polished the ports a bit , large can Allspeeds and F2 Powerjet carbs

banshee are standard fibre/nylon/plastic reeds,white,not carbon fibre,ypvs standard reeds are stainless steel

[lc350pete]

Sept 28, 2020 21:52:04 GMT 1 stasky said:

Sept 28, 2020 8:08:44 GMT 1 lc350pete said:

Forgive my ignorance 😳 but are the banshee ones carbon fibre and the std Yamaha ones white nylon ?
My bike came with carbon fibre ones when I bought it a long time ago, don’t know what make they are.
But I ought to replace them with new while it’s all apart anyway just not sure what to get
It’s a std 31K bike just polished the ports a bit , large can Allspeeds and F2 Powerjet carbs

banshee are standard fibre/nylon/plastic reeds,white,not carbon fibre,ypvs standard reeds are stainless steel

Thanks 👍😀

[Tobyjugs]

It looks a bit crude but it works well. This is Mk1, Mk2 will have a more rounded teardrop leading edge.