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Good point Chris, will do. Also buying a new Motobatt battery as seemingly the fitted battery was 3 years old and in truth probably not great quality. Will then check the charging system, even though it was okay at time of its return to the road, its possible that the regulator/recitifier is...

Thanks Mr S, this bike has points but I'll check the charging circuit to see if there is a problem. I think I'm at the point where I can't see the wood for the trees so need to start thinking logically instead of making assumptions. The forum is a good way to refocus

Carbs fitted back onto the bike with plastic tube attached to float bowls to monitor fuel levels. Open fuel tap, carbs fill and settle at about 4mm from the gasket mating surface. Bike starts using choke, switch off the choke after a few seconds and bike settles into tick-over, occasional...

Right Dave, I thought about it running a bit lean so Ive compromised on float height at 26mm and since my post this morning (about 5 hours ago) the fuel level, as indicated in the plastic tubes, has been holding steady at 3-4 mm below gasket face. Something it wasn't doing a few days ago and...

Thanks Wolfe, I had thought about the evaporation theory but thought the speed and amount was a little excessive but hey I've been wrong before. I'm also left wondering why the fuel only appears in the R/H carb and not the left. I did wonder if it was simply some sort of capillary action but...

Okay, after several trials I found that a float setting height of 29mm would stop the fuel level creeping up but which left the fuel level at roughly 15mm below the level of the float bowl join. Working back to a 27mm float height produced some interesting dynamics. Fuel creep was seemingly...

Hi Chris, sorry already tried this, post # 23, points 4+5. I am at work tomorrow and Tuesday so likely I won't get back into the garage till Wednesday. So its not that I've gotten bored, simply time management.

Mildly of topic mr S, but been a fan since 10538 Overture 1971/2

Sorry for the late response, away for the night after going to see ELO live in concert. Absolutely incredible set. Jeff Lynne is a brilliant musician. 35 years since I last saw them in 1981. Chris, carbs are off the bike at the moment so simply using a remote petrol source (permanently...

Okay after on GTI Daves advice. I checked this; at the previously set level of 24mm float height and with clear tube up the side of the carb, there is an initial fuel fill to approx. 2mm below the gasket surface but which then slowly creeps up till fuel appears in carb mouthThe R/H carb (as sat...

@GTI Dave, strangely I still do appreciate your input but perhaps if you were a little less condescending and maybe consider the manner and content of your own posts to total strangers it might have helped avoid the initial conflagration. Not that I feel I need to explain, but the reason that I...

Hi Chris, I tested the floats in some gasoline and although they do float but my concern was that they were 95% submerged. This is why I wondered if they were sufficiently buoyant. I compared them with some old GPZ1000 plastic floats which were about 50% submerged. Unfortunately I didn't feel...

Actually, I thought it was fairly restrained, I usually struggle with the intellectually challenged. You may also want to reconsider the post I reacted to and how it came across before you accuse anyone of poor manners. You were totally intolerant, judgemental and condescending. What did you...

Seriously......... " what more can WE do?"........... You need to chill out mate..............no none is arguing with you. I have undertaken all the tests and tried the possible solutions to nil effect. Perhaps you should read my original post more carefully and stop assuming that you think you...

Float valves brand new (needle and seat). I have tried varying float heights to nil effect. Bike was running superbly prior to winter lay up. Floats themselves are the only thing that hasn't been renewed

Hmm..........any ideas on what else might be causing fuel to seep past the float valves??

So in your opinion Chris, can the foam ones lose buoyancy?

I'm sort of hedging towards the floats as an issue, as I say the bike an perfectly till it was laid up for the winter and unfortunately without draining the carbs. Googling the float weight has not come up with any results and I agree that the older type brass floats are likely to be a better...

Had this 1980 XS 400 SG5 running beautifully last year after eventually sorting a 4000 RPM misfire. Started easily, ticked over steadily but over the winter layup, it drained the contents of the petrol tank into the engine. This despite the petcock and carbs being rebuilt with new seals and...

That's perfect Chris thanks for that.