A little 'learning' today

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A little 'learning' today

Postby Freddy » 14 Feb 2020, 04:55

Thought this 'discovery' today might prove useful to someone. Due to New Year stuff, house renovations, and then a VERY hot summer bike hasn't gone anywhere for some weeks. It needed a mechanical check as part of the annual registration process, so go to start it up to ride to the place that does all my rego checks. He just walks out and gets the odometer reading, that's why I go there (he knows all the family cars and bikes are well maintained).

Anyhow,to the point. Bike won't start even after being on 'prime' for some time. No amount of choke, no choke with full throttle, half throttle etc, could raise anything more than just the occasional 'kick'. I think to myself, well it looks like a carby strip and clean job. That doesn't really faze me having pulled them off many times and have the 'methodology' down pat. But before doing that I decide to just check there is fuel in the bowls by opening the drain taps. Only did the right three, the far left being a pain to get at. No problem, good stream of gas came out. Tighten em up, turn the ignition on, engine fires right up first crank.

The only explanation I can think of is an air lock in the fuel lines somewhere and opening the drain taps allowed it to flush out. Anyway, thought this discovery might be helpful to someone else faced with a similar situation.
Freddy
 
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Re: A little 'learning' today

Postby Shedman » 14 Feb 2020, 14:21

Good one Freddy, it'd be a pain in the arse if you had to do that every time you went to start it though!
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Re: A little 'learning' today

Postby Swampy » 14 Feb 2020, 19:24

Yes nice one Freddy, deff one to remember :)
Swamps :)
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Re: A little 'learning' today

Postby Freddy » 14 Feb 2020, 19:52

Shedman wrote:Good one Freddy, it'd be a pain in the arse if you had to do that every time you went to start it though!


It only happens when the bike has been sitting for several weeks, which because we can ride all year round is rare. Same symptom has happened in the past but in those cased I've been able to get it running on a couple of cylinders and its relatively quickly come to full life. In he past I assumed it must have been a bit of gunk buildup in the carbies from the fuel evaporating away while sitting, and getting it running cleared it. I'm thinking now this may not have been the case, and it's always been this air lock problem (if that is the true reason).

As it started INSTANTLY after I'd run a bit of fuel out the drain taps, I can't think of any other reason.
Freddy
 
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Joined: 06 Sep 2017, 12:06
Location: Sydney Australia

Re: A little 'learning' today

Postby David Richard » 14 Feb 2020, 20:29

on reading fredys problem i had the same about 2 weeks ago ,i split a set to put new o rings on the fuel pipes last year and only tried them recently ,i put a small funnel in the pipe and in no time fuel was spitting back out which puzzled me ,but the same problem i guess ,while i have done a bit to this bike its had some sort of fuel sealer in the tank like por 15 paint ,but its lifting its grey in colour has any one got a idea what i can use to get it out ,thanks david
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