Boneville Bobber Misfire

Hello all,

I’ve never used a forum before so if it’s wrong please help lol.

I have a 2017 Bonneville Bobber with very low mileage up until now with no problems. Since the recent storms (bike kept outside under a cover) the bike has developed what seems to be a misfire on the right hand cylinder as you’re sat on the bike. Seems to misfire backfire and intermittently only run on one cylinder. I’ve tried draining the fuel out of the tank and putting fresh in just in case there was water in the tank but this doesn’t seem to have made any difference. I have tried WD40 on the spark plug connectors just in case there was water there and it’s just the same.

any advice would be great.

thanks, Chris.

 

Thanks will do.

 

Thanks all I’ll get to my local dealer today and see if I can get the upgraded caps.

thanks for the info

 

Hello all again ....update on the bike ....managed to get to the dealer today and get two new plug caps ....swapped them over bike still unwell. Doesn’t want to properly at all now seems to be backfiring as well new and then cuts out.

 

Hi thanks for the response ....I’ve just taken the battery off to put it on charge so will make sure it’s reconnected correctly.
I’ve double checked that the caps are on correctly although checking the other end is more difficult as it’s under the tank I think, but again a great suggestion.
Not checked the ecu as I’m not sure if it’s location do you know where it is?
Kind regards

 

Hello again all,

Another update ....took the plugs out today and they look really black and sooty tried new ones still a bit rough but will run ...this would maybe suggest over fuelling?

Again any suggestions would be great it’s as I said a 2017 model with around 2.5k miles.

thanks guys

 

Hi thanks here a pic....no not sure on plug chop...