Scooterotica

Hi

I am putting an engine together for my Euro Lambretta trip; it’s a brand new SIL 200 casing to which I’m fitting a 225 Indian Ally top end. The barrel has been ported by Mick Abbey with the brief that I was looking for torque rather than max BHP. I will be running it with a 28mm PHBH and a JL3, Indian electronic plus an Augusto 6000.
I have a race crank fitted with a 110 jap rod which was put together by the late Dave Betts and I also have a MEC race crank. I know I’ll need a packer for the 110 rod (Dan recommended 2.5mm) but will that give me any worthwhile benefit over using the MEC?

I had heard that 225’s tend to vibrate a bit and that the 110 rod helps reduce it.

Your thoughts would be much appreciated; I haven’t seen the barrel yet and can’t wait to put the thing together.

Also, I will be using a 125 Special gearbox and bearing in mind that I want a comfortable touring set up, what sprockets would you advise. (I’m around 12 stone)
Again, your opinions would be most welcome

back to back the 110 rod will make a huge improvement. my brother is going with a 120 rod and matching piston on his rt255 to take the vibes out.

60 stroke with a 110 rod seemd to be the people favourite though for most uses.

125 special is the same as a gp200 box. do you know where peak power is expected to be?

cezeta wrote:back to back the 110 rod will make a huge improvement. my brother is going with a 120 rod and matching piston on his rt255 to take the vibes out.

60 stroke with a 110 rod seemd to be the people favourite though for most uses.

125 special is the same as a gp200 box. do you know where peak power is expected to be?

No I don't know precisely and I probably never will unless I get it on a dyno. Dan has suggested 16 x47 sprckets as a start which equates tyo 5.88 but I was hoping that it would pull something taller and won't have much time before the off to do any experimenting

My Mk1 186 muggy was running a 4.89 ration (Li 150, 16/46) and only struggled on steep hills or strong headwinds so I was really hoping that ther extra grunt from to bigger engine would make the difference

coaster wrote:

cezeta wrote: Dan has suggested 16 x47 sprckets as a start which equates tyo 5.88 but I was hoping that it would pull something taller and won't have much time before the off to do any experimenting

Sorry bud, that is my mistake then......i dont know why but i thought you were running an Li150 box, my mistake sorry. If you were, the 16/47 combo would give you approx 5.0 final ratio, which i thought would be a good starting point.

However, as i see you are actually running a 125 specialbox (sorry for the confusion) then something like a 18 or 19/47 would be a better place to start....

drunkmunkey6969 wrote:

coaster wrote:

cezeta wrote: Dan has suggested 16 x47 sprckets as a start which equates tyo 5.88 but I was hoping that it would pull something taller and won't have much time before the off to do any experimenting

Sorry bud, that is my mistake then......i dont know why but i thought you were running an Li150 box, my mistake sorry. If you were, the 16/47 combo would give you approx 5.0 final ratio, which i thought would be a good starting point.

However, as i see you are actually running a 125 specialbox (sorry for the confusion) then something like a 18 or 19/47 would be a better place to start....

Nice one Dan, that's what I wanted to hear What size chain would I need for an 18 or 19/47 set up?

82 link for 18/47
stretched 82 for 19/47...

sean brady scooters wrote:82 link for 18/47
stretched 82 for 19/47...

Thanks Dan.........I guess I'll put a request in the Wanted section for a stretched (worn) 82 link