help bike keeps cutting out

[lancasterlad]

help iv got a sv650s curvy turned it on a dinner time today to let it warm up,
went to drive off but as soon as i turned the throttle on it cut out.
i have no idea what the problem is,
it was ok on saturday.,
it does start but doesnt sound right then when you put the power on it cuts out
please can anyone help as its a long walk with the bike to the bike shop

[yorkie_chris]

Is it running on both cylinders? (check the downpipes for heat carefully)

Chris

[lancasterlad]

just been to check and yes there both very very hot :confused:

[yorkie_chris]

ok just mine behaved similarly when I put it back together and left one coil disconnected.

Maybe a clogged air filter, bit of junk in the carbs, dead rat in the exhaust...

Does it smell rich/smoke at all?

[lancasterlad]

its got a new air filter on,
its really odd that its starts but as soon as i put the power on it cuts out.

[yorkie_chris]

Will it rev at all, even if you open throttle very slowly?

I would just rip it in bits and see whats going on as this is new one to me, although could be wet fuel, try drain some out maybe... but I'm guessing now

[hovis]

somthing to do with the choke?

[lancasterlad]

wont rev at all mate,
will try the fuel tomorrow. what am i looking for with the fuel?

[lancasterlad]

what would be wrong with the choke?

[Biker_Billy]

what would be wrong with the choke?

Choke cable stuck open? Just a thought thats all...? The lever might come back, but might be worth checking if it retracts on the carbs too...

[fizzwheel]

If he bikes been stood for ages I'd try a fresh tank of fuel, Unleaded doesnt keep well and it "goes off"

If both the bikes warm enough to get the pipes hot but wont rev that sounds like it could be a choke problem but I'm not 100$ sure. Whats the choke lever feel like to move and whats the idle speed ?

[yorkie_chris]

When my chokes have been sticking it will rev but just be rough, and smell rich

[fizzwheel]

Mine stuck and the bike was idling at nearly 4000rpm and it also stank of petrol

[lancasterlad]

its idling between 1 and 2 going upto 2 then down then up then down.
all you have to do is touch the power and it cuts out,
the choke lever is fine,
fuels not old filled up at the weekend.

[plowsie]

any popping in zorst or anything like that? like unusual ammounts of it

[Spanner Man]

Morning all.
Water in the carburetors would give you those symptoms, as the main jets sit lower in the float bowls than the pilot jets, hence you're engine will idle (badly probably), but any attempt to give it some throttle, which is when the main jets are called into play will effectively cause fuel starvation.
The drain screws are a sod to access, particularly on the front cylinder, you need a long ball ended (MATRON) 5mm allen key, & a small torch will help you see the beggar.
Drain the carburettors, then start the engine & see how it runs. It may take a few turns to get it going as the carburettors will have to fill first.

Water contamination is much more common nowadays, since bikes started getting flush fitting fuel tank caps. Also, it seems more common to get it 'free' with your petrol. It's a good idea to check your tank regularly. Open the cap, allow the fuel to settle, & use a torch to see the tank bottom. Water will appear as a sort of murky Jellyfish.

The other thing that could cause these symptoms is a restriction in the airfilter, have you checked that blasted foam on the underside of the tank?

Cheers.

P.S. Don't smoke when playing with carburettors, & if you don't smoke at all, don't take it up now!:D

[lancasterlad]

just drained the tank off looks like water been in.
drain plug on the carb? where?

[lancasterlad]

well ive drained the carbs off but the batt went dead as i was turning it over, so it on charge tonight will try first thing in the morning

[lancasterlad]

thanks for all your help ive now fixed it,
drained the tank and the carbs,
thanks again, the bike shop would have prob cost me loads

[Spanner Man]

Evening all.
Good show, not too bad in the end then.

Cheers.