Have you ever tried it? Obviously not. Perhaps you should confine your comments to things you actually know about? Lemon juice is quite an effective acid, and easily eats away at fuel deposits, whilst leaving the brass of the jets unharmed, It works very well. Furthermore, you need to read more thoroughly:
"I've cleaned them thoroughly with a combination of carb cleaner, lemon juice and compressed air...."
I've found lemon juice to be more effective on stubborn jets than the carb cleaners we can get in the UK, which in any case are mostly degreasers.
As regards, the 4:1 and big bore kit, again you are making too many assumptions. I have found, empirically, that the 4:1 I have had on my bike since 2000 doesn't affect fuelling much, if at all, at low throttle settings. This is now the 3rd set of different carbs I've had on in that time. Both of the other 2 sets ran fine, and only needed to go up one size on the mains, and that only discovered on a dyno. There are good sound engineering reasons why this is the case, and as a former aircraft engine technician I understand them.
I also understand that an increase in capacity draws more fuel mixture through the carbs, not just air, so it's not automatic that you need to upjet for a big bore. Especially at low throttle settings. I've not found it necessary now on several GS1000s, if that is all that is changed. I am unusual in some cases in that I like stock airboxes and don't automatically reach for a set of K&Ns.
I anticipate that I will need to go up on the mains, but at the moment for road use where I'm not on WFO very often, the top end is fine. I think I mentioned that. My problem is not with carb cleaning or anything else other than what I mentioned: probable leanness at cruise, and I was asking for direct experience of that.
Thanks anyway.
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