Bike 'bogging down' when throttling on

[ducatilover]

if it were me, (and i dont know shit) after checking things like, leads, plugs, airfilter etc I would clean and balance the carbs.

Good idea. My first suspect is the idle circuit fueling is on the piss.

When you rev it when it's hot, do the revs drop back below idle when it settles?

[bogan]

I like the 'high idle' circuit method of setting the fuel screws. Also checking plugs is always a good plan. Could be float valve sticking/leaking as well; Factory Pro tell me if the bike doesn't accept full throttle from around 2k, a good thing to check is fuel level.

[barno]

4cyl 60hp ish. Like a Gixxer 400 motor.

yep that's it. A beautiful 59hp 4cyl 400. Just had the air filter cleaned on it; so I"m down to "fuel-related" or "intermittent-electrics related"

[barno]

Good idea. My first suspect is the idle circuit fueling is on the piss.

When you rev it when it's hot, do the revs drop back below idle when it settles?

Nope, it pretty much settles straight to idle speed quite quickly. Really bizarre. The bike is a bitch to warm up -starts fine, idles fine for about 2 mins, then starts to die off and you have to hold the throttle gently open for another 2 mins. Then it's fine to ride.

THe annoying spluttering only ever happens when the bike's nicely warmed up.

[ducatilover]

Have you cleaned the carbs and set the fuel screws? A bad idle when warm is a rich running issue, or, unlikely, your fuel line is heating up something chronic but, I highly doubt that

[barno]

The guy that had it before me (about a month ago) said he had the carbs cleaned out, and I have the bike booked in for a fuel line clean, filter install, and general sniff around on Sat morning, which will eliminate that out of the equation. I'm not that mech-minded but I'll consult the manual to see if I can find the location of the fuel screws (different to idle screw?). Worth a look!

cheers

[ducatilover]

The guy that had it before me (about a month ago) said he had the carbs cleaned out, and I have the bike booked in for a fuel line clean, filter install, and general sniff around on Sat morning, which will eliminate that out of the equation. I'm not that mech-minded but I'll consult the manual to see if I can find the location of the fuel screws (different to idle screw?). Worth a look!

cheers

The fuel screws are on the bottom of the carbs, different to the idle screw.
Good luck mate

[barno]

cheers I will have a nosey, noting carefully before the position of the screws before I do anything