SV cutting out

[munkygunn182]

So it'd be worth checking the charging voltage being provided?

You can quite easily start panicing and thinking major problems, only to find it's something stupid. For the sake of 5 mins checking it it's worth a look. Also batteries are prone to fail when the weather turns cold.

[munkygunn182]

yep, well i'll get that checked asap and see how we get on. I know its due a service, so it'll be getting new oil, plugs and filters as soon as i've got cash, so all going well, that'll sort it out. Only thing i can't do anything about is the damp

Get a can of WD-40 and F**k it alover the electrics, including the plug caps. My useless piece of info for the day is that the WD in WD-40 stands for water displacer.
It might smoke a bit when it gets hot but wont do any harm.

You have PM.

Fuel was put in during my bike safe ride on 3rd October, so it's 2 1/2 months old. Lots of people garage their bikes for 6 months over winter without using a fuel stabiliser, and have no problems. I really doubt it's that.

Your ECU is the most likely because that's the last thing you changed before the problem started occurring.

The second most likely is spark plugs, they are due to be changed now (8000 miles old).

Damp or cold is quite likely, that bike has never been kept outside, so I don't know how it will behave with that.

The battery or reg/reg was last checked last year in London. I think I parked in some ar$eholes normal space, and when I came out to leave I found the heated grips were on and the battery was flat. It definitely wasn't me that left the grips on, I checked it about 3 times before leaving the bike. The AA put a multimeter across it and it was fine then. Search on here will tell you what voltage you should be getting at what revs.

Sound like it's back to the damp thing or the ecu then. Condensation can do funny things with the electrics, the wd bath might be a good start. From the fact your getting loud bangs when it cuts out does sound more like an ignition issue rather than fuel. Perhaps a set of new plugs might be a good idea to start with.

[munkygunn182]

So when giving it a bath in WD-40, where do I want to concentrate on?

Would try riding it again before doing anything else. As you say, it fired up fine after swapping the 33bhp ecu back in, so you may not even have a problem.

[munkygunn182]

Yup will do, when Ralph sold me it, he made it clear that it was due a service, so that's getting done regardless. I'll try and get it out for a few miles tonight, weather permitting.

When running, you should get about 14. something volts from the battery, 11.5v- 12v when switched off.
But even on a bad battery you can still get 11-12 volts but no serious ampege to run a bike with.
As Ralph said, its more than likely the ecu restrictor, cos its always ran well before you changed that.

2 months old fuel is nothing, fuel is designed to last longer than that.
Id feel happy using 6 months old fuel but not much longer than that as it starts to go sticky and gunky.
That said i once run a lambretta in the 80's that had been sitting for well over a year that ran fine, but it was 2 stroke mix tb fair.