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The TS1 cylinder barrel, being of aluminium alloy construction and Nicosil coated bore, gives the tuner the capability of further improving the power output of the 200cc Lambretta engine without seriously affecting reliability. The standard TS1 Cylinder kit using one of the smaller Dell'Orto VHSA carburetors and our Taffspeed exhaust system produces a very impressive performance level. However, the TS1 cylinder when ported for additional power with the standard or Japanese piston has proved much more powerful (23bhp-25bhp). This tremendous increase in performance (approximately 20% extra over a standard TS1 cylinder) requires that for reliability elsewhere in the motor it is built with the ability to survive as long as possible. If the following points are taken to heart, the engine reliability will be the best you can achieve.
A typical high performance road scooter would be best suited by use of most of the following:
1. Uprated Crankshaft
By the use of Jap or European conrods. These are fitted into a GP 200 type crankshaft. Yamaha rods are available 110mm long to suit standard piston type kits, or 115mm long to suit a Jap pistoned 200 kit. The Rotax 115mm long conrod is used with our Jap 225. It is immensely strong and uses an 18mm small end type bearing which does not then require the use of caps within the piston to reduce the pin boss diameter. We use Japanese Yamaha conrods, with Yamaha or Suzuki race big end cage and rollers. These uprated crankshaft assemblies have the ability to survive at high RPM for long periods, when a race quality two-stroke oil is used.
A further increase in the performance can be gained by padding the GP crankshaft assembly with aluminium blocks to reduce crankcase volume before its reassembly. We have had NEW GP crankshaft webs made to suit the Japanese conrods we now use, so the price is now comparable to that of the standard crankshaft.
2. High Performance Flywheel Bearings
Usually of European manufacture but sometimes Japanese, these sit in a "plastic" cage, which allows a larger number of rollers and greater load capacity. They are used in all of the motors we assemble. All other engine bearings should be of "BEST QUALITY" to avoid premature failure.
3. GP Electronic Ignition Kit
This is highly recommended, as it gives superb lights, accurate and reliable ignition and has lighter flywheel weight. It may require slight modifications to the mag flange area to ensure that it cannot touch the flange studs and wiring clips and on some mag housings it may rub on the outer edge. The lighter flywheel weight leads to improved engine pick-up and acceleration and reduces the possibility of the crankshaft twisting around the big-end pin due to excessive loads. It does, however, need a slightly faster tickover than normal to retain smoothness - not normally a handicap on a tuned motor. It is now only available to suit non-battery systems.
A typical high performance road scooter would be best suited by use of most of the following:
1. Uprated Crankshaft
By the use of Jap or European conrods. These are fitted into a GP 200 type crankshaft. Yamaha rods are available 110mm long to suit standard piston type kits, or 115mm long to suit a Jap pistoned 200 kit. The Rotax 115mm long conrod is used with our Jap 225. It is immensely strong and uses an 18mm small end type bearing which does not then require the use of caps within the piston to reduce the pin boss diameter. We use Japanese Yamaha conrods, with Yamaha or Suzuki race big end cage and rollers. These uprated crankshaft assemblies have the ability to survive at high RPM for long periods, when a race quality two-
A further increase in the performance can be gained by padding the GP crankshaft assembly with aluminium blocks to reduce crankcase volume before its reassembly. We have had NEW GP crankshaft webs made to suit the Japanese conrods we now use, so the price is now comparable to that of the standard crankshaft.
2. High Performance Flywheel Bearings
Usually of European manufacture but sometimes Japanese, these sit in a "plastic" cage, which allows a larger number of rollers and greater load capacity. They are used in all of the motors we assemble. All other engine bearings should be of "BEST QUALITY" to avoid premature failure.
3. GP Electronic Ignition Kit
This is highly recommended, as it gives superb lights, accurate and reliable ignition and has lighter flywheel weight. It may require slight modifications to the mag flange area to ensure that it cannot touch the flange studs and wiring clips and on some mag housings it may rub on the outer edge. The lighter flywheel weight leads to improved engine pick-
