Hot starting issues.
Posted: Wed Aug 26, 2009 2:05 am
Right.
I've seen a couple of threads on this, but nothing with progress in it, merely 'have you got them?'.
It's getting to the point of rediculousness with my bike - so much so that I have started allowing myself about 25-30 minutes if I'm going to need to fuel up on my way to work.
Thinking about it for the last few hours, I'm suspecting to a degree, vapour lock being somewhat of a possibility.
Another thing worth thinking about more specifically, is the routing of the fuel line - resting atop the gearbox and directly behind the carbs and top of the cylinder head as it is, it's got to be subject to some fairly high temperatures, so that's worth thinking about. Not only that but it has an uphill section to the line, which if vapour lock is ocurring within the line more prominently, would be a bit of a bitch to solve.
Worth trying I think is a) adding breather lines to the float bowls - allowing vapour (being less dense than fluid), to escape the float bowls and denoting reliable fuel feeding, and b) attempts to cool the fuel line, or simply heat shielding it to a degree, by switching for metal braided line, and possibly afterwards, wrapping said line with some heat shielding tape.
Option c) is a bit more involved, if neither of the above work. Option c involves a small, low pressure pump, installed in either the tank or the fuel line itself, to keep oh, say, 2 or 3 PSi of pressure on the fuel line, and avoid any complications caused by either, or a combination of the uphill section and slight vapour pockets, not allowing the line to flow correctly. An electric carburettor pump, if you will.
The only things that would thwart that theory somewhat initially that I can see, would be the float bowls on the carbs already having breather pipes built in, or the bike already being fitted with an electric carb pump. It'd still be possible, but they ought to alleviate the problem fairly well.
Can anyone answer me the question of whether or not the ZXR 400s had breather pipes routed from the float bowls as standard, (and if so, across the range, or only on some models).
The same question for Electric Carburettor Pumps.
The bike in question is a grey L4, in case anyone is wondering.
I've seen a couple of threads on this, but nothing with progress in it, merely 'have you got them?'.
It's getting to the point of rediculousness with my bike - so much so that I have started allowing myself about 25-30 minutes if I'm going to need to fuel up on my way to work.
Thinking about it for the last few hours, I'm suspecting to a degree, vapour lock being somewhat of a possibility.
Another thing worth thinking about more specifically, is the routing of the fuel line - resting atop the gearbox and directly behind the carbs and top of the cylinder head as it is, it's got to be subject to some fairly high temperatures, so that's worth thinking about. Not only that but it has an uphill section to the line, which if vapour lock is ocurring within the line more prominently, would be a bit of a bitch to solve.
Worth trying I think is a) adding breather lines to the float bowls - allowing vapour (being less dense than fluid), to escape the float bowls and denoting reliable fuel feeding, and b) attempts to cool the fuel line, or simply heat shielding it to a degree, by switching for metal braided line, and possibly afterwards, wrapping said line with some heat shielding tape.
Option c) is a bit more involved, if neither of the above work. Option c involves a small, low pressure pump, installed in either the tank or the fuel line itself, to keep oh, say, 2 or 3 PSi of pressure on the fuel line, and avoid any complications caused by either, or a combination of the uphill section and slight vapour pockets, not allowing the line to flow correctly. An electric carburettor pump, if you will.
The only things that would thwart that theory somewhat initially that I can see, would be the float bowls on the carbs already having breather pipes built in, or the bike already being fitted with an electric carb pump. It'd still be possible, but they ought to alleviate the problem fairly well.
Can anyone answer me the question of whether or not the ZXR 400s had breather pipes routed from the float bowls as standard, (and if so, across the range, or only on some models).
The same question for Electric Carburettor Pumps.
The bike in question is a grey L4, in case anyone is wondering.
