Scooterotica

santacama wrote:Is it a 60 mm stroke crank?

Yes it is ,its the serie pro reed version...

http://blog.scooter-center.com/auf-dem- ... si-210mhr/

I know this is, at the end, publicity ..... but like I said, I will be more than happy with 30 HP.

Santacama, This is pretty impressive power but 8500 rpm on a standard PX200 gearbox is 91 mph ( 145 Km/h ). This is what happens when you go for high peak power, the bottom end is lost. Under 6000 rpm on this one the Germans tested, is not much better than a standard. Have you tried your one yet?

My MHR engine is going to take some time to be ready because we race an old Malossi 210 and the £ and time are limited.
I think 15 HP at around 5500 RPM is ok. We are not going to have that exotic pipe, a RZ MARK II is going to have to do it. Probably they are using a short 4 gear and the test is done in 3 gear.
Sincerely, even being publicity I think it is the truth.

For racing the long stroke MHR will be fine. On the road for daily use it's not going to make you so happy.

225worb is happy.

I have a Primavera 125 CC with a Pro Cup kit (Quatrini) with 132/186, reeds, Keihin PWK 28 and I am really happy.

What has a Primevera got to do with the longstroke MHR?

Long intake timing.

I think you have misunderstood what I am trying to say. Do you actually tune engines or get someone else to do them?
When I said 126 degrees for the main transfer port timing this is for a PX200, with a PX200 gearbox, to be used as a daily road use scooter. Other engines on other gearboxes have totally different limits. The transfer timing has a major affect on the bottom end pull of any 2 stroke. If you don't weigh much, are track racing or have 6 gears it doesnt matter so much

Jack221 wrote:I think you have misunderstood what I am trying to say. Do you actually tune engines or get someone else to do them?
When I said 126 degrees for the main transfer port timing this is for a PX200, with a PX200 gearbox, to be used as a daily road use scooter. Other engines on other gearboxes have totally different limits. The transfer timing has a major affect on the bottom end pull of any 2 stroke. If you don't weigh much, are track racing or have 6 gears it doesnt matter so much

I have a hard time writing in English. I wish we could talk about Vespas personaly, having a beer

Ah!!!! of course I tun engines.