Vfr 400 possible fuel starvation

[Jaq213]

Hi all,
My vfr 400 has started to give what I think is fuel starvation at 5500rpm. Just backs off. Idles fine and goes fine till that threshold . Any ideas?

[gavins]

Will it just not rev past 5500ish at any time, i.e in neutral as well? Assuming an NC30 and assuming the speed restriction hasn't already been bypassed, check that the 3 pin connector from the back of the speedo is connected properly. If this is disconnected altogether the bike just won't rev past 5k from memory.

[CMSMJ1]

^^ what he said :)

Welcome to the site.

Have a search for 5500rpm or 5.5k and you will find oodles of data - the bottom line is that if the bike CDI cannot "see" the speedo then it cuts 2 cyls.

Easy fix and we've all been there!

[Jaq213]

Thanks for the reply. I'll check that out after work and let you know.

[Jaq213]

Hi guys, checked all connections but problem persists.

[magg]

The detector electronics in the speedo could be faulty. As already suggested, disconnect the 3 pin connector from the speedo and apply the bypass to the loom side. The document library on the home page has instructions.

[Neosophist]

as magg has said... remove the speedo sensor plug and jumper the wire.

[Jaq213]

Thanks guys. Followed instructions and all sorted. Thank you very much.