5 mm stem valves to suit GM and all Jawa ( JRM ) motors, including 250 & 350 cc.
35 mm inlet & 30 mm exhaust for GM 500
35 mm inlet & 30 mm exhaust for JRM 500
31 & 30 mm inlet for JRM 250, 350 cc
26 & 27 mm exhaust for JRM 250, 350 cc

Valve Spring Bases, 1 mm thick.
Fibre Washer shims ( 1.0, 1.25, 1.5, 1.75 mm thick ).
Mica Washer approx. 0.15 mm thick

Quality spring retainers for 5 mm stem valves and VS03 springs. Collets to suit 5 mm stem valves, hardened lash caps to fit over the top of 5 mm stem valves.

Quality aluminium bronze valve guides to suit both JRM ( Jawa ) and GM engines. Suitable for 5 mm valve stems.

Double springs to suit 5 mm valve kits.Inner and outer valve spring sets, designed and developed by the Institute of Spring Technology for use in track racing engines. These springs undergo hot pre stressing to ensure durability and are life tested to 1.3 million cycles.
These have a lighter spring pressure to suit lightweight 5 mm valve kits.

These valves are made specifically for PJR. 6 mm valves stems with 30, & 35 mm diameters heads for JRM. 30, 34 and 35 mm heads for GM engines.
Gas flow tests show a marked improvement over standard equipment.
Available individually or in sets.

Inner and outer springs specially designed for todays high revving, high lift engines. Tested to over 14,000 rpm these springs are suitable for even the most radical cam lifts.
Fits both our 5 & 6 mm retainers.

Inner and outer valve spring sets, designed and developed by the Institute of Spring Technology for use in track racing engines. These springs undergo hot pre stressing to ensure durability and are life tested to 1.3 million cycles.

Tappet adjuster kits to replace standard JRM ( Jawa ) tappets, kits consist of machined tappets with hexagon heads, lightweight K nuts and GM type buckets. They allow finer and more consistant adjustment than standard parts. Kits are suitable for 5, 6 & 7 mm valve stems.

Aluminium spring retainers to suit TEP springs with GM, PJR, new type JRM valves and collets or TEP springs with old type Jawa valves and standard 6 or 7 mm Jawa colletts.

96 x 2 mm viton o rings for use in sealing between head and cylinder. Suitable for both long and short stroke cylinders.

IWIS and TSUBAKI cam chain to suit all JRM and GM long and short stroke engines.
87 and 88 link Iwis cam chain supplied with split link and soft link to suit GM motors.
Endless 98,100,102,104 and 106 link Tsubaki cam chain to suit JRM motors.
Other length chains made to order.
All chains supplied ready to fit.

Our recommended spark plug is the R0045G/J surface discharge plug. This product has no electrode and reduces the risk of expensive engine failures.
We also stock the R0373A-10 which replaces the R016 & R017 range.

With the R016 and R017 range of plugs either discontinued or replaced, there is now a budget alternative to the R0045G -10 and the R0373A - 10.

Plastic holder for all types of spark plug. Available in Red, Blue or Yellow.