Roaming Wolf
Member
Hello,
2018 K-9 VFI. Rear cylinder switches off when hot and the bike is idling. It happens after about 30 min riding. No check engine light, just the bike looses power. Checked for the spark - nothing. If the front cylinder wire is disconnected the bike dies. The coil is relatively new -2 years old I believe. The wires are the same age, Screaming Eagle. If I switch the bike off, then start again and ride on 1 cylinder, after about a minute the second one switches on and the bike runs fine. I understand the rear cylinder gets hotter due to its location, especially now as the heat is coming back over here. The ECU that I have which was installed by Big Dog is locked and I can't change any settings there. I contacted S&S, they confirmed this and offered me a new one that can be adjusted. It is quite expensive though. So, before I buy it I want to check if anyone has had a similar issue. I understand most of the bikes here a crab ones. I have been thinking of downgrading it to a carb. This will require quite a lot of mods though, according to S&S. In such case buying a new ECU might make more sense. Can there be an issue with anything else? So far I have: coil, wires, ECU. O2 sensors a very unlikely. I changed one to original Bosh and they usually through a check engine light. Also, the spark should remain on the second cylinder.
2018 K-9 VFI. Rear cylinder switches off when hot and the bike is idling. It happens after about 30 min riding. No check engine light, just the bike looses power. Checked for the spark - nothing. If the front cylinder wire is disconnected the bike dies. The coil is relatively new -2 years old I believe. The wires are the same age, Screaming Eagle. If I switch the bike off, then start again and ride on 1 cylinder, after about a minute the second one switches on and the bike runs fine. I understand the rear cylinder gets hotter due to its location, especially now as the heat is coming back over here. The ECU that I have which was installed by Big Dog is locked and I can't change any settings there. I contacted S&S, they confirmed this and offered me a new one that can be adjusted. It is quite expensive though. So, before I buy it I want to check if anyone has had a similar issue. I understand most of the bikes here a crab ones. I have been thinking of downgrading it to a carb. This will require quite a lot of mods though, according to S&S. In such case buying a new ECU might make more sense. Can there be an issue with anything else? So far I have: coil, wires, ECU. O2 sensors a very unlikely. I changed one to original Bosh and they usually through a check engine light. Also, the spark should remain on the second cylinder.
