Pulling away, happens at the wrong time

[nt1980]

Ive read this some where but cant locate it.

I have had this ongoing issue for about a year and its got to the point that its just plane annoying

On a run out at the week end i was coming up to a round a bout and the engine just cuts out as though its a stall now it has done this for a while
you might be riding along at 30 and it will semi stall then carry on or pulling away from a junction loads of beeans and it cuts out again
it s abit like russian roulette these days only used to do it once may be but seems to be increasing.

I have tried the usual plugs, leads, both units under the seat, checked the charge etc checked the loom in case there was a wire earthing out.

Any one else have this and did they ever find a solution.

[tony.mon]

Yes, it's the old "carb cough" again.
They all do it, to minimise it turn the tickover up to 1300 after you've balanced the carbs.

Actually fitting an ignition advancer cures it completely.

[nt1980]

Hi Tony

Thanks for the reply i have mine set on 1200rpm if i go any higher the drone gets to me lol il try the advancer may be worth a shot

[darkember]

Actually fitting an ignition advancer cures it completely.[/quote]

Tony would this by any chance have anything to do with the timing being that half tooth out we discussed the other weekend?? My mind just decided to step outside the box might be completely wrong in my thought process.

[tony.mon]

Actually fitting an ignition advancer cures it completely.

Tony would this by any chance have anything to do with the timing being that half tooth out we discussed the other weekend?? My mind just decided to step outside the box might be completely wrong in my thought process.[/quote]
Nothing to do with it, ignition advance is totally different to cam timing.

[VTRDark]

On a run out at the week end i was coming up to a round a bout and the engine just cuts out as though its a stall

Is this under hard braking. If so it may be the carb vent hoses that run through the middle between the two carbs. Pull the pipes out from the sharp bend that they run through the hole in the carb side plates. Some people pull them right out, cut them shorter and let them hang outside.

An ignition advancer advances the point as to when the plug ignites the charge BTDC, so moving closer to the piston as it's coming up on the compression stroke. Retarding is the other way. But don't confuse this with the TPS which advancers and retards. The TPS moves that point around to compensate for piston speed. The faster the piston travel the sooner/more advanced that point of ignition needs to be.

(:-})

[2wheelsagain]

Mine has a carb cough running BP premium but not Shell premium and total flame out at idle running some other "blended" fuels. (all premium)
The VTR although not high compression is sensative to fuel quality.
Have you changed fuel brand recently?

[nt1980]

On a run out at the week end i was coming up to a round a bout and the engine just cuts out as though its a stall

Is this under hard braking. If so it may be the carb vent hoses that run through the middle between the two carbs. Pull the pipes out from the sharp bend that they run through the hole in the carb side plates. Some people pull them right out, cut them shorter and let them hang outside.

An ignition advancer advances the point as to when the plug ignites the charge BTDC, so moving closer to the piston as it's coming up on the compression stroke. Retarding is the other way. But don't confuse this with the TPS which advancers and retards. The TPS moves that point around to compensate for piston speed. The faster the piston travel the sooner/more advanced that point of ignition needs to be.

(:-})

The carb mod i have all ready done

Fuel still the same as ever

\does it either ticking over or running along at 30 60 or breaking its just pot luck when

[nt1980]

On a run out at the week end i was coming up to a round a bout and the engine just cuts out as though its a stall

Is this under hard braking. If so it may be the carb vent hoses that run through the middle between the two carbs. Pull the pipes out from the sharp bend that they run through the hole in the carb side plates. Some people pull them right out, cut them shorter and let them hang outside.

An ignition advancer advances the point as to when the plug ignites the charge BTDC, so moving closer to the piston as it's coming up on the compression stroke. Retarding is the other way. But don't confuse this with the TPS which advancers and retards. The TPS moves that point around to compensate for piston speed. The faster the piston travel the sooner/more advanced that point of ignition needs to be.

(:-})

The carb mod i have all ready done

Fuel still the same as ever

\does it either ticking over or running along at 30 60 or breaking its just pot luck when

[8541Hawk]

The one time I dealt with something like this it ended up being an issue with the petcock vacuum line.

It was the same type of symptoms in that the bike would just die from time to time and it didn't matter if you were at idle or on the power.

After it was check by the dealer and a few other places it finally ended up at my place.

What I finally found was the the vacuum line was about 3cm too short. So when it was routed, as per the factory drawings, through the frame clip that also hold the fuel line it was slightly pinched.

This allowed the line to collapse from time to time.

The fix was to remove the line from the frame clip. this gave the line extra slack and also removed the pinch point that routing the line through the clip can cause.