Practical Sportsbikes (UK)
Route to a remap
I have a 1998 Triumph T509 Speed Triple with the 885cc engine and Sagem fuel-injection. When I bought it a few years back it already had a Werkes USA stumpy performance exhaust, but it runs very rich, as commented on by my MOT tester. It has also had two new sets of spark plugs in the four years/4k miles that I have had it (total 15k miles). Would a remap cure this issue – and if so can you recommend anywhere in the London area?
James Fawsitt, email
Chris Jagger says: If it hasn’t had a remap it will definitely need one to match the exhaust. FI systems are adaptive but only within a small range. The danger with an open pipe is usually lean running, so running rich has prevented damage here. Perhaps whoever fitted the Werkes exhaust has adjusted it with a generic diagnostic tool.
What you really need is open pipe tune using the correct diagnostic equipment. The Sagem system on this bike is open loop, in contrast to a closed loop system with a lambda sensor or sensors telling the ECU what to do. The CO has to be measured, and the fuelling richened or weakened accordingly. I’m in Walton-onthames, so in the London area.