Going back to rotary
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Ossessionato
1979 P150X, 1983 P200E, 1988 T5, 1995 PX200E, 2011 Yamaha Fazer 600 S2
Joined: 02 Aug 2015
Posts: 2136
Location: Veria, Greece
Sat Jan 02, 2021 11:56 am quote
I think my mazzy bell crank has twisted on my P221. I was out for a ride at the end of November and while returning home, the engine started misbehaving. Flywheel seems to be rubbing on the stator. To be honest, I pushed it really hard, cause I needed a huge dose of "vespa-crack". Being also tired with chasing the jetting on the PWK, I decided to go back to a rotary valve motor and do a "mild" tune. Initially, I was going to use my old cases and just weld a plate inside the gearbox but my wallet was a bit itchy, after the Christmas bonus. The Malossi V-One cases are on discount on the official Malossi store, including free shipping, so I've bitten the bullet. A Polini longstroke crank and a SI26/26 are already here. The 210 Sport stays along with the Cobra...

I'm currently contemplating if I should weld a plate in the new cases or leave them as they are, while waiting for them...

More updates to come...





Ossessionato
73 & 74 Rally, 76 ET3, 80 P200, 06 PX150, 61 Ser 2, 65 Silver Special, 86 & 96 Elite 80s, 2015 HD Road Glide Special, 2011 Ural Tourist
Joined: 18 Jan 2012
Posts: 3839
Location: Oceanside, CA
Sat Jan 02, 2021 2:04 pm quote
What damage did you do that you need a plate welded on the gearbox?
Ossessionato
1979 P150X, 1983 P200E, 1988 T5, 1995 PX200E, 2011 Yamaha Fazer 600 S2
Joined: 02 Aug 2015
Posts: 2136
Location: Veria, Greece
Sat Jan 02, 2021 2:23 pm quote
MJRally wrote:
What damage did you do that you need a plate welded on the gearbox?
It was done as a precaution to avoid cracks on the primary shaft and cases failing as a consequence...

This is from my current reed cases...

29314448_2044415432240139_1479328195785261056_o.jpg

Ossessionato
Joined: 26 Oct 2015
Posts: 2888

Sat Jan 02, 2021 3:07 pm quote
Well, that plate will be easier to weld in if the cases haven't been contaminated with oil.
Molto Verboso
62 VBB1T Round Tail W/ leaner sidecar
Joined: 26 Jan 2019
Posts: 1970
Location: california
Sat Jan 02, 2021 4:10 pm quote
Safis - donít the v1 cases you bought come pre-reinforced?
Do malossi cases need a plate like you used in your old p200 cases?
Jet Eye Master
PX221 Malossi, O tuned PX200 and some motorbikes
Joined: 14 Jun 2017
Posts: 2567
Location: London UK
Sat Jan 02, 2021 4:27 pm quote
Unfortunate but exactly what happened to mine a few months ago. I got the crank straightened and am still running it. I did buy another crank at the same time but that's now a spare.

I see why you want to go back to rotary but is still a highly non standard carb set up. Setting up the PWK is not impossible. Buying a simpler carb might have been cheaper.

Malossi cases are thicker where it matters and probably need flex where they are not. If you don't want your old reed casings I'll have them!
Banned
2:6
Joined: 11 Jan 2007
Posts: 7647
Location: San Francisco
Sat Jan 02, 2021 5:48 pm quote
that plate is a really cool idea, had never seen that
Molto Verboso
One or two fun scoots....nothing too precious
Joined: 17 Jul 2013
Posts: 1584
Location: UK (South East)
Sun Jan 03, 2021 1:11 am quote
This got me thinking about cranks in high hp reed motors. There are more expensive options like the Uncle Tom from SIP or the Kingwelle. Are they physically stronger and more resistant to twisting, or does the higher price have more to do with flow and power?
Ossessionato
1979 P150X, 1983 P200E, 1988 T5, 1995 PX200E, 2011 Yamaha Fazer 600 S2
Joined: 02 Aug 2015
Posts: 2136
Location: Veria, Greece
Sun Jan 03, 2021 10:35 am quote
So, I shouldnít weld the plate then. Supposedly they are reinforced but if I recall, FMPís review said otherwise. Anyways that will be a decision when they arrive. Jack, donít know if Iím going to sell the reed cases or keep them. Iíll let you know, although shipping to the UK could be a bit expensive. Anyways, Iíll update the thread when the cases arrive...
Hooked
PX 225, SS 180, 90SS
Joined: 07 Sep 2009
Posts: 167
Location: New Zealand
Wed Jan 06, 2021 11:21 pm quote
I will be watching this one with interest SaFis, I have a set of V-One cases and getting ready to build a long stroke setup with Malossi 210 Sport. Are you going to run standard gearing?
Molto Verboso
2007 Stella 225
Joined: 02 Nov 2019
Posts: 1401
Location: Rochester, Minnesota
Thu Jan 07, 2021 9:37 am quote
With Malossi and Pinasco both making cases, is there a specific reason you chose Malossi cases?
Ossessionato
1979 P150X, 1983 P200E, 1988 T5, 1995 PX200E, 2011 Yamaha Fazer 600 S2
Joined: 02 Aug 2015
Posts: 2136
Location: Veria, Greece
Thu Jan 07, 2021 2:34 pm quote
Christopher_55934 wrote:
With Malossi and Pinasco both making cases, is there a specific reason you chose Malossi cases?
Malossi is better overall. They use 8mm bolts instead the stud-nut combo, modern sealing surfaces (no gasket), ports are ready for their cylinders, can work with all crankshafts.

Pinasco has/had quality issues with tolerances in the bearings seats, too much casting porosity resulting in air leaks and lately they became so greedy that they changed the rotary pad width so as to make you buy their crankshafts cause they're the only ones that can work with the cases. And Pinasco is basically just a marketing name nowadays. The company was sold a few years ago...

1.jpg

Ossessionato
1979 P150X, 1983 P200E, 1988 T5, 1995 PX200E, 2011 Yamaha Fazer 600 S2
Joined: 02 Aug 2015
Posts: 2136
Location: Veria, Greece
Wed Jan 20, 2021 12:32 pm quote
Cases came today. Really nice but packaging was terrible. The kickstart area broke through the box and was hit a few times during transportation. Thankfully no harm done. Sent Malossi a "nice" email...









Molto Verboso
62 VBB1T Round Tail W/ leaner sidecar
Joined: 26 Jan 2019
Posts: 1970
Location: california
Wed Jan 20, 2021 12:40 pm quote
Safis
Very (very) cool.
Question: how does the inlet size look compared to a stock P200?
Is the case flowed better between the inlet and the cylinder base - or pretty similar to stock P2?
Ossessionato
1979 P150X, 1983 P200E, 1988 T5, 1995 PX200E, 2011 Yamaha Fazer 600 S2
Joined: 02 Aug 2015
Posts: 2136
Location: Veria, Greece
Wed Jan 20, 2021 12:49 pm quote
Haven't cracked them open yet, but rotary and flow is basically "stockish" according to tech info. Only difference is the ports that are ready for the Malossi cylinders...
Molto Verboso
79 P200E, 62 Allstate, 2008 Stella
Joined: 11 Jan 2006
Posts: 1939
Location: Florence, OR
Wed Jan 20, 2021 1:45 pm quote
Wow - beautiful. This'll be fun to watch.
Moderator
VNB VSC VBC VSX
Joined: 28 May 2008
Posts: 4616
Location: Hustletown, TX
Wed Jan 20, 2021 1:49 pm quote
Pretty stuff
Hooked
1981 P200E / 1979 P200E / 1974 Rally 200
Joined: 30 Jul 2009
Posts: 481
Location: San Francisco, CA
Thu Jan 21, 2021 2:11 am quote
Excited to see this project!

The V1 is basically the same as the original casing, just with a different port layout?

What's up with the mixture screw on the Spaco carb? I modified mine so it was a screw Ė shortened it, and cut a groove into it. It has a different thread pattern than the Dellorto one.

I didn't understand the purpose. It sticks out, so the rubber cover doesn't fit, and has a hex head, which is basically impossible to adjust. Very tight for a socket or a flat wrench.

The carb is otherwise identical to Dellorto.

Screen Shot 2021-01-21 at 2.10.43 AM.png

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