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Post by versaldean on Nov 12, 2014 21:10:12 GMT
Hi,
I have a little problem with the vacuum system and I wonder if anyone can help me out. I've only just got this bike and only 1 of the other bike's I've fiddled with has had a fuel system involving a vacuum. Thankfully it hasn't been a problem yet.
On the Diversion though, I find that whatever position the fuel tap is in, fuel will flow at a rate of knots out of the outlet from the tap. My understanding is that this should only happen in the prime position, though I could be wrong. This is preventing me removing the tank to get at all the bits and pieces I want to check/adjust underneath.
Another vacuum system symptom is that the Scottoiler isn't working. I only bought the bike a couple of weeks ago and the seller said he'd just fixed it, and showed me a small pool of oil on the road where he'd had the bike warming up for my test ride. I've never encountered one of these either so not sure what to look for.
Can anyone recommend likely places for leaks/blockages and any ways to test the whole system or bits of it? Or else explain if I am doing something wrong (maybe I need to disconnect a different tube to stop the fuel flow)?
Thanks in advance,
Sam
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Post by HRHpenfold on Nov 12, 2014 21:26:51 GMT
The fuel flow should stop automatically, the valve maybe dirty or need a new gland, Rebuild kits are about £20, try sucking and blowing the pipe first, consider converting it to an electric pump, if it still has the vacuum pump fitted,
The scottoiler may just need adjustment, the oil will be cold and stop flowing, so try turning it up,
Personally I use a small jar of engine oil and a paintbrush, after cleaning the chain with a rag soaked in brake cleaner!
That keeps the chain well lubricated and only takes a few minutes!
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Post by versaldean on Nov 12, 2014 21:49:15 GMT
Looking around there seems to be plenty of advice recommending an electric pump if the vacuum one fails so I'm happy to do that if needed. I've been trying to run down the tank to below the reserve level so I can remove the tank and inspect the pump and tubes more easily. Think I'm just about there. I'm not tied to the Scottoiler but it seemed a handy idea for long trips, given that it's fitted. So far I've been doing it manually. I'll look up some instructions on setting it up properly.
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Post by gsteinert on Nov 12, 2014 22:36:59 GMT
The few flowing fuel is not a symptom of a dodgy vacuum take off, rather is the tail that's the problem.
The vacuum operates the tap (turns it on if you like) turning the engine off kills the vacuum and should stop the fuel flew. In this case it looks like the tap isn't closing properly.
The vacuum pump on my divvy seemed to do the job up until I actually ran out of fuel. Is not powerful enough to fill the carbs to allow the engine to restart - I had to fill the tank and wait 20 mins for gravity to do the job. Am electric pump, for the few quid it costs, is a worthwhile upgrade to avoid that hassle!
Gary
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Post by versaldean on Nov 12, 2014 23:21:33 GMT
Ah, that's a good suggestion. I don't really have a clue what's happening in the tap but either I was disconnecting the wrong hose or there must be some kind of vacuum valve in the tap itself. I'll try removing it and giving it a good clean once I can remove the tank. I did have fuel problems the 1st time I had to use the reserve and ended up sending a mate off to find more petrol and bring it back to my bike. Perhaps we were just confused and didn't wait long enough for the carbs to re-prime from the reserve. I'm hoping to make it through my 1st mot on this bike tomorrow and then I can feel a bit more free to start investigating further down in the bike.
Thanks for the tips.
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