SM610 power loss after disconnecting battery

Niko · Jul 10, 2012

Hi, I posted this on SMJ yesterday and thought I would have a better chance at finding help, if I ask around here as well with a few additions.

I'm talking about a 2009 fuel injected model. So I accidentally dropped a couple of wrench tips and they fell between the battery and the rear fender, took the battery out, got the stuff out and put it back in place. Started the bike the next day and noticed a significant power loss when accelerating. Couldn't pull it up on 2nd, higher rpm's with lower speeds, more rattle, comfortable cruise speed with higher gears and top speed around 6-8mph lower.

Of course I can't be 100% sure it's the battery, since assumption is the mother of all fuck ups, but that's the only thing I did.

So, what gives? Did I somehow manage to disconnect/connect the battery wrong and it messed up the EFI or could this be something else?

Lambda plug has been installed to the pipe by the previous owner, and i suppose the power plug/resistor bypass thingy is in place as well (how would I know?).

Went to a dealer and their thought was that electrical issues usually aren't a common cause for power loss related problems, and that removing the battery shouldn't cause things like this. I do remember that I accidentally disconnected the RED positive cable of the battery first, and after that I checked from the manual that the BLACK ground cable should be disconnected first. While reconnecting I also did it in wrong order, ground first, then positive. Could this have caused some resistor/fuse to burn out?

I also mentioned that the bike fell on its left side while running and they thought that might've caused some issues with lubrication and/or piston rings. Even though I fell on soft sand while doing a tight turn and the bike had halted to a full stop before falling. I can see some oil leaking from the point where the exhaust is connected to the cylinder(don't know the right term, exhaust manifold?) but that was there before and they mentioned the exhaust fumes from my bike smelled a bit funny. Oil level still seems to be the same as before.

Nevertheless, they said it'd be around 500€ to investigate and that's a hefty price to pay from one small trip on sand or battery removal.

I think the oil leak and smell are just a cause of there being too much oil (window almost full), but could this relate into the power loss in any way, because the oil level has been the same for around 1500km now?

Hope you'd had the time to read. Thank you.

1lunger · Jul 10, 2012

Window should be almost full ( small air bubble at top ) over fill and it will come out via vent to air filter. Not the cause of power loss. Check fuel, fuel filter, carb or FI if 08-09

BTW- check oil level with bike stright up not on stand.

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SM610 power loss after disconnecting battery

Niko Husqvarna
B Class

1lunger Husqvarna
AA Class

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SM610 power loss after disconnecting battery

Niko HusqvarnaB Class

1lunger HusqvarnaAA Class

Niko Husqvarna
B Class

1lunger Husqvarna
AA Class