backfiring spluttering dying and just been a real pain

[kevin wilson]

hi guys im back again with another problen my bike is been a real pain in the ass lately,,it will drive fine and then it will just die and wont start for a minute or 2 and then start and drive again for another few mile and then die again,,and when it gets wet from rain when i try to start it it starts backfiring spluttering and wont rev up and the rev counter needle jumps all over the place,,has anyone encountered these kinda problems before and if so can you tell me please how do i go about fixing them thanks for looking kev

[ozracer]

Sounds like an electrical earth problem to me. Check earth wire from battery to frame and the earth that goes to the CDI.

[theoutsider]

I`ve got this problem,I am quite sure the spark plugs are dead.

[kevin wilson]

i dont tink its anyting to do with the sparkplugs as the bike drives fine before this problem occurs,,its fairly frustrating tho as i have checked everyting over and everyting looks fine but the bike is still acting up

[Neosophist]

fuel tank breather blocked or fuel tank vaccum pipe split?

[kevin wilson]

no its not that either neo,,the fuel tap on the bike was broken when i got it so i removed the diaphram and inserted a inline fuel tap so the tank is gravity fed instead of vaccume and i have no kinks in the fuel line,,,to explain it a bit better its a bit like rectifier failure when the bike starts backfiring and dying out but its not the rectifier as i checked it and its fine ,,the voltage reading is constant and not reading all over the place like it would if the rectifier was dodgey

[Cammo]

Sounds like an electrical earth problem to me. Check earth wire from battery to frame and the earth that goes to the CDI.

+1

Can't remember if there's an instrument guage earth wire (there is a tacho earth) but if there is it could also be responsible for your symptoms.

[kevin wilson]

i was just looking at the wireing diagram in the haynes manual and i see and understand what your explaining,il have a look more closely at that tomorro and il let ye know how i get on cheers:)

[Cammo]

While you're checking wiring, it might be worth looking at all the loom connectors closely also. Check the instrument gauge plugs and others.

I've had issues in the past with pins being pulled out of connectors, the nc30 wiring system can become pretty poor with age (much better on nc35's).

[Jas RVF]

Might help using a multi meter to see if theres a high resistance from each point. just a thought.