dan williams

Makes the bike grunt. I swear it'll pull a gear higher in any situation and stalls very rarely even crawling. The logic is the reeds weigh less so they have less inertia and can open and close faster storing more charge in the crankcase at low rpm. At higher rpm reeds of any type will just stay open so there is no difference in the engine assuming there is no significant difference in the reed cage and how it affects airflow.

I admit the graphs are exaggerated but I think this analysis gets to the core of the thing. I'll have to do more research and do some math on actual diaphragm springs and friction coefficients to see if I can refine the description. But like always, I could be barking mad and have no idea what I'm talking about. Certainly wouldn't be the first time. Probably won't be the last either. But isn't it fun that life is full of mysteries to figure out. 😁

OK so I got to thinking again. Dangerous I know but I'm bored with circuit theory at the moment so I figured I'd try to understand what the big whoop is with a diaphragm clutch since I haven't seen anyone explain the difference. This is my take on it. Feel free to shoot it full of holes and call me an idiot. The diaphragm clutch.pdf

I've had several EVO 300s but just bought a low mile 2020 Factory 300 that I've been taming or at least trying to tame. There is definately something to the Factory engine that is different. Looking at the parts lists the standard and Factory have the same cylinder and piston but a different ignition module so more aggressive timing I would guess. On my 2020 I've added Moto Tassinari carbon reeds V351B block with 3P412M reed petals, S3 long header pipe, S3 low compression head, clutch mod and gear shifter mod and 9 tooth countershaft sprocket. It's just now getting to where I want it but every once in a while it remembers it's a Factory and tries to kill me.😁

And knowledgable. About what I’m not sure but speaking with that much confidence is surly a sign of expertise.😁 Yes it looks like a typo, but is it really?🤔

Seller is delusional. Stay away from this one.

Welcome to the family.

Wow that's pretty.

I'm inclined to think the Hipple part is the way to go. George's stuff looks well thought out and well made. As to the matter of more drag as the clutch plates have less maximum separation with less clutch throw I don't think that will be a big deal if the washers that take up the slack in the mechanism are adjusted properly.

Trialman is most likely correct. It's common for bikes to shear the woodruff key if the engine has a sudden stop. Especially if the flywheel nut isn't properly tightened as the flywheel is an interference fit to the crankshaft. The woodruff key is just for alignment. It is possible to have a bad stator as well and still have spark. What usually goes out of these older stators is the trigger coil that tells the CDI where to fire. If the trigger signal is weak the CDI could be firing in the wrong location so you have spark but in the wrong part of the cycle.

Carb is probably due for a disassemble and cleaning. The Keihin can get water trapped in the bleed passages for the pilot system that can make it feel soft off the bottom. Is this a new behavior or something it's always done? Also as the weather changed you can expect the jetting to shift slightly with air density.

Now THAT’s funny!😀

Last Sunday was the shakedown for the new to me 2020 EVO factory. Popped out of gear several times just tooling around and once on a slab entrance in a section. Just put my cam and indexer in. Couple of interesting finds though. The factory cam now has pointy lobes and they put a spacer in to offset the indexer to better align with the cam just like my design. Beta still uses the worst bearing though and the neutral detent is still pretty shallow. Not my problem anymore.

On the 2018 I added two teeth to the rear and liked it very much. 10/44 I think but I’ll have to look. The 2020 is still stock. Messing up my already dodgy timing but I’ll try to get used to it. I might go for the lower gearing later.

Fettling done for now. Six thin (2.7mm) plates with the fix, 3mm offset washers and blasted the steels with fine aluminum oxide. Tried the bike and had massive clutch slip. Reduced the spacer washers on the throwout bearing about half a mm and all is well. Behaves pretty much like every other clutch I’ve done the fix to.

Yeah bolts are cheap.😁

Possible but postage is around $30

Also I can’t claim credit for the design. The original design came from “ikb” who I haven’t seen on here for a while.

Yeah and now I bought another EVO and need another set.😁

I’ve ordered another run of the 3mm offset clutch washers. Gonna have to charge for these as I gave away the last batch and it’s expensive to give away custom parts.I figure $35 for a set should cover my cost and postage in the US. I’ll have to figure out a payment scheme. Not gonna give them to a dealer to sell this time. Tried that last time and he just gave them away and everyone said what a great guy he was for giving them free parts. 😬

Ooooh the 2020 Factory has a light-switch clutch and a bit of delay when trying to release the clutch. Also the pull is heavy. I wanted to try before I modify and I'm not surprised. Needs the carbon reeds too as it's easier to stall. Let the fettling begin!

To be honest my 2018 has an old clutch pack. I just bought a 2020 factory that looks like it was never ridden so I’ll have to see what it looks like inside.

I should probably clarify I mean a hydraulic issue as in the clutch plates dragging around the gearbox oil like a torque converter. I know from experience the drag is much worse with colder or thicker fluid which would seem to prove the idea. Having just said that I'm wondering if there is some fluid flow trickery that could improve the situation? Hmmm, gotta think about that. I admit I've kinda moved on from the clutch thing believing Beta would have changed the design by now. Silly me.

There is less separation but I’m not sure the drag will be greatly affected as the drag seems to be a hydraulic issue rather than a partial contact issue. But I could be wrong. That’s how I learn. I’ve learned a lot.😁

I’ve considered it but there’s not a lot of places to move it to. Being in the US I figure I can get rid of half the wiring.