SBN Mikuni carb lean condition

[Bill O'Neal2]

Re: SBN Mikuni carb lean condition

sure, anything is possible. If the crank was twisted, that could be the cause of the deto.......
I'm just throwing out ideas, none of which may truely be YOUR problem.

[Jamie in NY]

Re: SBN Mikuni carb lean condition

If you're getting a new SBT motor, then the crank SHOULD be fine. And, if the timing is "way off", like more than 10 degrees, then both cylinders would suffer. If a new motor is having trouble with only one cylinder, I would suspect the carb, assuming no air leaks and no cooling restrictions. The metal splatter on your plug is probably melted aluminum from the piston. Just sounds to me like you're running very lean and hot for some reason.

[Bill O'Neal2]

Re: SBN Mikuni carb lean condition

Jamie,
When a crank is twisted, you can have only one clyinder with the timing way off, depending on where the twist is in the crankshaft.