SIMON’S S SERIES SECRETS…
Simon Lister runs online parts supplier Kawasaki Triple Parts (tripleparts.com). What he doesn’t know about S1 and KH250 triples probably isn’t worth knowing. Here are his tips based on his wide experience...
1 Original thought
If you value originality, make sure you buy as complete and original bike as you can. Relatively few S1s were sold in the UK and genuine parts are scarce. Pattern parts have improved over the years, but to maximise showwinning potential, you need the correct genuine parts.
2 Hard-to-find parts
Original exhausts are getting very hard to find; they look very similar from the 1972 S1 up to the 1980 KH250, but there are subtle differences. The pipes on my 1974 S1-B are unique for that year. S1-C pipes will fit and don’t look much different, but they have different codes. Pipes for some models have different internals. Rims are date-coded.
3 Want it for riding?
Change the gearbox oil, drain the oil tank and clean the filter fitted in the bottom of the tank. Strip and clean the oil pump, too. Prime the freshly-cleaned pump by holding the pump wide open, starting the bike up and letting it tick over until all the bubbles disappear from the oil lines.
4 For a bit of extra power
The 350 S2 barrels fit straight on S1 and KH250 crankcases.
5 Carburettor crisis
Carbs can be a bit of a nightmare on all the 250s. The pilot jets are so small, they’re easily blocked. Ultrasonic cleaning works well, and ensure the inside of the fuel tank is spotless.
6 Beware of the boss
The mounting boss for the righthand footrest is often bent. The boss is welded to the frame at the front. They can be rewelded, but it’s an engine out job.
7 Values on the rise
Expect to pay £7000-8000 for a nice 1972 S1, £6000 for an S1-B and £3500-5000 for a smart KH.