So it's just emissions crap? If so, can it be cut out of the loop without any effect on performance later? Will it alter the way the ECU learns? This begs another question: Do bikes from countries that don't require the canister experience these problems? If so then could we be looking at multiple potential problems, which is making a solution harder to find. If all the fuel wasted from poorly running vehicles as a result of pollution control equipment since 1970 were added up it would probably amount to 20% of all the fuel burned in that time.
The tank vent valve is only on the US models and it is included in both the fault monitoring and diagnostics tests for engine ECU's. Same deal with the BMW Rotax models. If you check the testing results from DRZCharlie they show it pulsing and also the injector timing being reduced when it is open to the inlet. When removing it it would seem you would need to also reprogram the BMS-E to ECE firmware to stop the reduction in injector timing when the BMS-C believes it is active
Yes, it can be removed with no ill effects. Many, many people have. I have left my emissions systems in place, with no ill effects. It has been shown to be a potential problem in the past. As with most of this TR, YMMV.
Thank you for the info and scope shots, very interesting. The Purge Valve on the bike in the video was faulty and leaking air in creating a 'lean condition' not a rich one. Plugging the hose between throttle body and valve completely cured the crappy running and 'random' stalling issues. My theory is that this is occurring on more than one bike and could be the cause of the stumbles, but I need to test it a little more. On my bike there is no cannister but I still have the valve so I will use it to test the theory that the bike stumbles when the valve is in operation.
You could be on to something here,but without a poor running bike and some test equipment its hard to verify. Actually,I think since there is no Mass airflow on this bike to meter the airflow entering the engine the actual lean condition comes from the fact that all available fumes have been sucked from the cannister and the leaking purge valve is allowing pure air to be pulled thru the cannister and into the engine,which the o2 immediately reports to the ecm and it responds by going full rich to compensate for high o2 and causing crappy running.All theory of course... I Here is a graph from my LM2 while I was pinching and releasing the purge hose.You can see how much effect it has on the fueling
Hi big-t, Good chart. It looks like the rpm dips when you pinch the hose. The AFR on the Terra is not that well controlled by the ECU but I don't see any signs that it goes full rich.
