gutless

[Wideboy]

as title says really.

took the bike out this morning and it was absolutely gutless :(, i have no idea whats wrong with it. Pulling away is pants and the usual little flat-spot it gets in 1st has gone because it usually kicks in about mid range then i get good power afterwards, but now i don't.

i then thought it was because it needed a service BUT its not due for a service for another 100 miles so its not as though I've been neglecting it.

I last took it out on Monday and it was running perfect, roads weren't wet, all i did was put it in the garage and cover it over and it was bone dry.

im a bit of a numpty when it comes to twins as i've only had experience with singles and mopeds

im going to shoot off in min to get the stuff to give it a service.

[sinbad]

How does it sound?

[mattSV]

Did I pass you going through Botley?

Ah, just seen your PM ;-)

[YZEtc]

See if anything is blocking the air intake or even for a rodent's nest starting to accumulate inside the airbox.
It's possible.

I've read that 1st generation SV-650s use a stick-on sound dampener that's on the underside of the fuel tank, and if this falls away from the tank, it blocks the air intake directly below.

[Wideboy]

How does it sound?

sounds normal thats why i was puzzled

See if anything is blocking the air intake or even for a rodent's nest starting to accumulate inside the airbox.
It's possible.

I've read that 1st generation SV-650s use a stick-on sound dampener that's on the underside of the fuel tank, and if this falls away from the tank, it blocks the air intake directly below.

thats what i was thinking. im about to delve into the bike and give it a bluddy good service

Did I pass you going through Botley?

Ah, just seen your PM ;-)

yes was me, i was in a hurry to get home :D

[Biker Biggles]

Sticking chokes/plungers?Always a favourite on the curvy.

[yorkie_chris]

Possible sticky choke as mentioned, worth taking them out and cleaning and greasing them and the cables. But it's worth doing that often anyway. As well as removing the foam under the tank, because it does nothing and you might as well.

If that and the air filter are OK then I'd possibly check the carb diaphragms

[HopefullySoon]

hi

I'm experiancng simialr probs



If i cover the rear carb air intake the bike stalls , if I cover the front carb air intake the bike stills runs , am I right in thinking that the front carb hasn't got an airtight seal and is drawing air in elsewhere .

Sorry



Hopefully Soon

[yorkie_chris]

Are they balanced?

If you've got the balancing screw wound way too far out and the idle adjuster unscrewed a fair way then that would allow it to do that, and also be really lumpy and horrible. If that all checks out then have a look for an air leak, if its not something stupid like the carb clip rusted in half then its possible the rubber boot has a hole in it, hairspray works to temporarily seal leaks like that, but it would have to be a big leak if putting your hand flat over the carb mouth doesn't stall it. You're not a million miles from me, give us a shout if you want me to take a look.

[HopefullySoon]

If that was at me chris no idea , not got a carb balancer .

I noticed that the front slider wasnt fluttering as the back one was , and have hesitancy under acceleration and crap starting .

[yorkie_chris]

Does it move when you open the throttle?

If not then there's a carb problem which isnt letting the front pot have any air, otherwise I'd say seriously out of balance. PM sent.

[Wideboy]

well just finished, everything looked fine but the oil was abit thick and black that probably wasn't changed at last service (4000 miles ago). Haven't started it up yet as i ran out of oil and its just hovering below minimum.

Sticking chokes/plungers?Always a favourite on the curvy.

Possible sticky choke as mentioned, worth taking them out and cleaning and greasing them and the cables. But it's worth doing that often anyway. As well as removing the foam under the tank, because it does nothing and you might as well.

ahh! about a month ago i got the bike out to take to work early one morning and when i shut the choke it stuck, i opened it up and closed it and it shut so i thought nothing more of it, i will do this next weekend.

cheers and everyone:notworthy:

[toonyank]

Maybe a stupid question but are both cyliders firing?

You did say it sounds fine so it's probably a yes. Still worth asking although I'm not sure if a twin would even tick over on one pot. My older IL4's would tick over on two because I had two HT leads foul and the same time but this is my first twin so I don't know.

[chris8886]

Maybe a stupid question but are both cyliders firing?

You did say it sounds fine so it's probably a yes. Still worth asking although I'm not sure if a twin would even tick over on one pot. My older IL4's would tick over on two because I had two HT leads foul and the same time but this is my first twin so I don't know.

ooooh they run on 1 cyclinder!! had that damn problem for the last month!! front cylinder kept not firing intermitently!! in the end found it to be a vacuum tube (i think, forgotten already!!) running from the airbox to the front cylinder.

when running on just the one cyclinder there's zero power and the sound is very stange!!

[Wideboy]

Maybe a stupid question but are both cyliders firing?

when running on just the one cyclinder there's zero power and the sound is very stange!! what i thought

well i got some oil in my lunch break today so i topped the bike up when i got home the took it for a 20 mile spin, what can i say, i had probably the most fun you can have on a bike in the pitch black, bags of power i've had a big grin on me face ever since i got home :D:D:D

and i looorve the exhaust notes:D:D:D:D