LCGB Forums

How 3D printing technology is changing Lambretta tuning part development...

http://www.scooterlab.uk/birth-of-a-cylinder-kit-ss-250-feature/

What a kit,I want one,
it is so great not having these studs in between...

Well done SLUK

So what happened to the 305?

Digger wrote:So what happened to the 305?

The 305 will only ever exist in small numbers due to BSG being so busy with other projects, but there was obviously a demand so this project has been developed as a cheaper option. For me, the more interesting proposition is the SST touring option.

I think there's a lot more people who think they want 50hp than can actually handle it. However, a little less power, decent fuel consumption, low vibration and power from really low down are what I'd look for in an engine that I'd actually use.

Wise words Mr Round

I rode Mickey's scooter yesterday that is fitted with the kit and it does everything it says on the tin.
The front lifted off the throttle in second gear gear when I let it go but then I turned around and pottered up the road like it was an LI150. Full on hooligan when you want it to be and easy to ride around town and in traffic. It was also really smooth with very little vibration, I must say I'm very tempted to have one...

Realistically......how much will these beauties cost all in ????

looks great! as for the price they say under £700 but that is just the barrel, you need the cases, crank and dedicated exhaust at least before you look at the drivetrain and rear hub, soon adds up.

£6000.00 I was told by a young man working on the stall.

I tried to order a 305 engine earlier this year and was told that not all the parts were available and the price had yet to be set but was well over £10,000 and rising. I gave up and chose another option.
If this new kit gives the "magic" 50bhp for half the price i suspect the 305 will be shelved.
Stickys point about handling that power is very true, could I handle a BSG on the road, we'll never know but it would have been fun trying!

So here's an interesting question. Given the choice of:

A: a bridged port, big carb, expansion chamber, 50hp but quite rideable and progressive engine
B. a single-port, small carb, expansion/box making 35-40hp with more torque and longetivity in mind

which would you really spend money on if the price was not much different?

This is a serious question because I am aware that a lot of people would want full-fat rather than the more sensible version. It's often a question of want rather than need

Option b for me,. But if I was still in my teens or 20,s option a, the real answer for a kit manufacturer hoping to sell slot of kits instead of showing of to other tuners can be found by visiting any uk scooter event - looking at the average age of the people actually riding scooters , and doing the maths.

I would go for B

My Pro Porting 283 has bags of torque and it's lovely to Cruise on. On the odd occasion when I do leather it (so 80mph plus) I don't for very long so torque rather than top speed for me.

I thought that might be the case.

I'd love to drive a Ferrari if someone gave me one to play with for free, but in reality I'm much more likely to use and cope with the running costs of a hot hatch.

The difference here is that buying the hot hatch or the Ferrari may cost about the same, and in that case, sensible may get less of a look-in

It looks something like a Honda RS125 GP cylinder,why didn't they go for an Aprilia RSA replica?
100 hp target

If I had the money,i would choose option A,
I don't,so I can only dream.

I can make a 35 Hp (lowest touring spec) but just for one ride before it explodes on the road

Sticky wrote:So here's an interesting question. Given the choice of:

A: a bridged port, big carb, expansion chamber, 50hp but quite rideable and progressive engine
B. a single-port, small carb, expansion/box making 35-40hp with more torque and longetivity in mind

which would you really spend money on if the price was not much different?

This is a serious question because I am aware that a lot of people would want full-fat rather than the more sensible version. It's often a question of want rather than need

Martin

Option A for me - If I want sensible two wheeling I'll use the Griso.

£700 barrell
£1800 masimo case crank and ignition
£300 hub and layshaft.
Clutch??

If it has enough tourque and spread to gear a 4 speed to 90mph.

Sounds good value. You could spend years of trial and development and alot more money to achive this.

It really needs casa to have the confidence to produce in sufficient numbers to get the economy of volume that would then make it viable.
Its a viscious circle.

Option B for me lol.....frankly my 20 BHP Avanti is more than quick enough from the off and will comfortably sit at 70 mph on motorways ............. in reality a 90 mph Lambretta would frighten me being on them small wheels but I guess the zip around town would be nice lol .....

My real worry on a Lambretta has always been with all that power manufacturer's are kindly giving us low/top end nowadays that despite using high performance bearings and crankshafts in our builds in today's world......the 'weak link' is still in my opinion the layshaft which 'might' shear under torque, or the additional BHP we are now seeing, will put unnecessary forces through the layshaft.........so my question is "is there not any thought being processed into thickening the layshaft and thus increasing section size along with cone size etc to the hub and also maybe introducing a secondary 'fail safe' measure to keep the hub retained against the engine if a layshaft did ever shear"..........playing devils advocate there must be others out there thinking the same thing and many of us now perhaps riding increased powered lambrettas may be using 50 year old layshafts susceptible to failure...........

Is there anyway SLUK or scootering could engage a materials design engineer to do a test on new layshaft versus old layshaft 'pro's and cons' to see what this reaps....again only a thought ?

Strummer10 wrote:
My real worry on a Lambretta has always been with all that power manufacturer's are kindly giving us low/top end, and although we use high performance bearings and crankshafts in the build......the 'weak link' is still in my opinion the layshaft which 'might' shear under torque or put unnecessary forces through it so my question is "is there not any thought being processed into thickening the layshafts and thus increasing them along with cone size to the hub and maybe a secondary 'fail safe' measure to keep the hub against the engine if a layshaft did ever shear"..........playing devils advocate there must be others out there thinking the same thing and many now riding increased powered lambrettas may well be using 50 year old layshafts...........

Is there anyway SLUK or scootering could engage a materials design engineer to do a test on new layshaft versus old layshaft 'pro's and cons' to see what this reaps....again only a thought ?

Hi, I agree about the weak links being a worry, but they are being dealt with one by one by various manufacturers. As regards layshaft and hub, these are coming with upgraded splines and threads soon and we've had offer to video the tests for SLUK.

^... having had a layshaft fail on me, I'm wondering what benefit the new design may actually have? I say this as the failure point that I experienced, which matches all other failures that I know of, which is where the shaft fails at the thread cut for rear hub nut. As we appreciate from cracks forming at square cut piston windows, sharp corners of bodywork, square cut steps in crank pins, etc. so I am concerned that redesigning the spline section of the body may not in any way address the failure point, which seems to be the threaded end of the layshaft. Unless this section is made thicker (bigger diameter) for a larger nut size, we may not end up with a product that is any better than the current layshaft.

Do we know if this threaded length and nut size are being increased?

Adam