T100 Bonneville Runs On One Cylinder After Winter Lay Up

I assume it is an air cooled 865? The chrome gizmo is the secondary air injection system designed to improve exhaust emissions. You need a skinny plug tool to get past it.

Your problem could be fuel or an ignition coil but with the balance pipe it can be hard to tell as they spark every rotation. Have you checked/switched HT leads?

 

Probably Plug or if not fuel or ignitor!!

 

Redex or similar needed in the petrol. Should help clean out the system. Several on here (me included) use such witchcraft to good effect. Even if it doesn't clear the problem at least you will know that the fuel system is at its best. Fresh petrol wouldn't go amiss either.

 

Really pleased you posted this Alex. I have the same problem but my 2015 T100 is only firing on the rh pot after the winter layup. Ran fine during a couple of mid winter warm ups. I’m a proper novice with EFI as I’ve only ever had carbs before. Any tips/ help would be great.
Ps I’m a newbie to the forum so be gentle, thanks and hello everyone, John.

 

Alex Wright
Most people get rid of that secondary air induction and blank it off. Bike runs better and you can get your plugs out easier.
Regards
Joe.

 

Does removal of SAI always require re-jetting? I ask because I have an absolutely stock 2001 Bonneville with the SAI untouched. Bought new so I know. Pipes are badly blued but the bike still runs well at 45,000 miles.

Recently came into a 2005 Bonneville which has had multiple owners and I see the SAI is plugged off. The bike runs but not well. Which makes me wonder, if rejetting is required, that it was either not done or done wrong.