LCGB Forums

i have a spare spainsh 150 engine in the garage,am thinking going old school with a suzuki 190 converion ! but am total green to this kit,what work is needed to the barrel and head and what size conrod and webs? i have a wiseco ts185 piston ! any info at all would be usefull!

Taken from Dave Websters tuning manual.Non race use
SX GP barrel Height 94mm 2mm off top 5mm off bot
TS185 piston compression height 32mm
Skirt length 62mm cut both sides
con rod length 107.. li 150
Exhaust 170dg port height 23mm height over port 36mm
transfer 130dg 14mm 45mm
inlet 165dg 22mm 70mm
dwell 55dg

Hi, over the past few years my 150 has evolved into a Suzuki 192 conversion, with the help of Reaper Tuning here in Cambridge, using the following:

Suzuki TS185 piston
60mm Mazzuchelli crank
26mm Dellorto PHBH with remote filter
BGM Clubman
BGM electronic ignition
Agusto 6000
Spanish Li150 gearbox -11/14/17/20
46T Crownwheel
15T Front sprocket
80 link chain
Final drive 5.2

It's a great little engine, sits comfortably at 60-65 and has hit 70 using my phone gps speedo app. The same dyno has been used on all the different engine changes, starting at 175cc/11bhp and the best run on the latest build reading just over 15bhp with 11ft/lb torque. I can't tell you the intricacies of tuning the barrel, Viv at Reaper did all the work there, but I love riding this scooter, it goes equally well through town & country, holds its own on the motorway and is reliable for riding all year round to work and just for the hell of it... highly recommended

Good luck, Mark

I have run Suzuki 185 pistons in the old SR185 barrels with good results. I opted for the 116mm con-rod in a standard GP crank, as this gives better (less wild) options for the inlet timing. The 107 rod can make the inlet timing too large, even before you start opening it up to get the correct gas-flow.

However, there is no need to go made with the ports, as this set-up will sit happily with standard 200's all day every day.

BTW, are you sure that the 150 casing is not suitable for conversion to 200 spec, by the likes of Oiltek or Chris Sadd at Norwich? Measure across the mouth of the casing where the barrel spigot goes, top to bottom. If it measures 85mm, it is a true 150 casing. If it measures 90mm, it is a 200 casting, machined to 150 spec.

110 rod 60 stroke crank, shorten barrel 1mm off bottom 2mm off top
Or 3mm off bottom
Or 1 off top 2 off bottom
A little porting, head skim and re profile.

ahhhh I remember the monster of all threads , before the crash

Does anyone know the overall height of a TS185 piston? The compression height is quoted as 32mm, but is the piston height greater than the 71mm of a standard Lambretta piston? I know the skirt needs to be trimmed back for the old school conversion using a small block iron barrel, but it would be very useful to have dimensions of the piston out of the box - before the hacksaw is applied!