Well - last top end rebuild I got a completely new cylinder mounted and new piston, rings etc. Top and valves overhauled and machined - but the bike still uses oil and fuel consumption is still shitty.
I had a Triumph Tiger 955 earlier on and at one stage that bike also started to use a whole lot of oil. But I got it rebuild and it was good as new, no oil consumption and fuel consumption was never an issue on that. Its strange to think about that if I rode the tuned 950 cc Tiger with around 110 HP in 80-90 km/h it used notably less fuel than my 48 HP Tenere at the same speed. Fuel is the single biggest expense on a RTW trip so it bothers me a lot, and especially since the Tenere newish I could get 27-28 kms/l.
I would like to hear more about the «ventilation of the engine» issue with the Tenere? Mine is running hot too for the moment, I have had thought about oil circulation issues or the PVC valve and the breather box. Breather box was improvisedly fixed at one stage. But unfortunately Im not very mechanically skilled so I dont know...
KTM 690 has many issues that I have read about, at least the earlier models. But then again its a highly tuned high performance machine. Its not a tractor like the Tenere. Anyhow - KTM was not a part of TS questions...
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In the end everything will be fine. If its not fine its not the end....
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