Every time I put a load on the motor(rolling on the throttle to pass, or climbing a hill)the check engine light comes on. Once the load is gone the light goes back out.
Ive pulled the codes and found p261,p263 and b1004. The p codes are low or open fuel injectors. The b code is a fuel level sending unit low.
any help on the cause and repair would be appreciated.

 

Partially clogged fuel filter? This could result in a decrease in supply pressure to the injectors flagging a fault condition.

 

Are you getting any pre-ignition under load or while accelerating?

 

Are you running SE spark plugs? We had this happen about 2 weeks ago on a bike in our shop. Same exact thing you are having. Changed his plugs to regular plug and wham, no more problems.

 

+1. Didn't have the same codes, but those high dollar SE plugs in the 120r did the same thing. Regular plugs... no more lights.

 

How's that new dyno coming? If you need any help give me a shout. John hasmy number. It'd give me an excuse to get away or a day.