NC29 running problems

collywog19 · Post by **collywog19** » Sat Feb 19, 2011 9:10 pm

HI guys, need some help and pointers.

Recently acquired a cbr400rr nc29. IM no stranger to bikes and working on them but this one is driving me nuts.

It runs and rides great, new iridium plugs and a new set of carbs due to fuel inlet plastic part cracking on old carbs.

I have a problem, when i thrash it, in any gear, it kinda bogs down, if i am sitting at about 90mph and let off , then put throttle back on, its as if theres isnt any fuel getting to it for a few seconds. ive checked the fuel pump and it does work, can this be the problem? ie: not pumping enough fuel through.

its the only thing left i can think of really, I was sat at tyne tunnel earlier, payed, and went, i redlined it in first from there and it ran ace, was this due to sitting and the pump filling the bowls?

once into second and a bit more speed it was bogging down again

any help appreciated. cheers

Post by **hallsie** » Sun Feb 20, 2011 4:18 pm

Sounds almost like the restrictor kicking in

collywog19 · Post by **collywog19** » Sun Feb 20, 2011 6:03 pm

its got a speedo converter on so its not that.

ive spoke to my mate who had a nc23, and he had a ride on it, says its exactly liek his was, and he had to change the main jets. so im gonna get onto that.

cheers