ST1100Y
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Smaller mains hence less lateral movement?And all four of them are the same part number in the above listing, which is what I wrote.
Smaller mains hence less lateral movement?And all four of them are the same part number in the above listing, which is what I wrote.
To this previous post, I responded that on the US/CM models the parts list states that the needles for both LHS carburetors and both RHS carburetors all have the same part number. Because they are all the same P/N, all four carburetors use the same needle. If they are all the same needle, they do not have unique shapes on the LHS verses the RHS, on these models.... ergo some unique shape for LHS and RHS...
You very well may be correct about that. I have no idea about the mains and I did not look them up to compare. I can also assure you that you have more experience with that and you would certainly know better than I do. I have interpreted mains to mean main jets?Smaller mains hence less lateral movement?
Got widely distracted as this issue is spread across several threads in here, plus I had 2 tabs with parts listings open as well...The discussion between us was whether or not the US/CM models have different carburetor needles for the LHS carburetors verses the RHS carburetors.
Two threads only !Got widely distracted as this issue is spread across several threads in here, plus I had 2 tabs with parts listings open as well...
I will try and find my micrometer and when I do I will take some measurements and also photograph the needles side by sideWithout actually seeing the needles I assume the forward ones being shorter or more progressive to even the mix for all 4 cylinders as good as possible.
Just check with the parts catalogue/fiche if the J1BP or the J1BQ go in front/rear... or left/rightI will try and find my micrometer and when I do I will take some measurements and also photograph the needles side by side
and thats were it all started ! it isn't clear where they goJust check with the parts catalogue/fiche if the J1BP or the J1BQ go in front/rear... or left/right
overhaul kits for left vs right makes sense because of the way the float chambers are handed , it doesn't necessarily void your thoughts on front vs rearBecause then again I checked with the NRP site, only to find that they offer kits for the right and for the left carburetor, making my thesis nil and void...
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I recently did the carbs of my '94 with OEM spares:overhaul kits for left vs right makes sense because of the way the float chambers are handed , it doesn't necessarily void your thoughts on front vs rear
Below is why I see this diagram as distinguishing left from right as opposed to FWD from Aft.[I also maintain that it is possible to interpret the parts diagram either way ie front vs rear or left vs right ]
Your assessment of the diagram is valid, however, if you flip the line so it separates front from rear it also is validBelow is why I see this diagram as distinguishing left from right as opposed to FWD from Aft.
Honda defined the orientation of the motorcycle in this diagram via the arrow and the term FR.
I added the red line to extend this orientation through the illustration. It delineates left from right using the centre-line of the engine.
The red numbers 1 & 3 are the carburetors of cylinders 1 & 3 on the right-hand side of the engine.
The red numbers 2 & 4 are the carburetors of cylinders 2 & 4 on the left-hand side of the engine.
Following this logic;
Item # 20 is the needle of the carburetor for cylinder # 3 on the right-hand side of the engine.
Because it is not listed separately, and because the quantity is listed as 2, this indicates that carburetor # 1 also requires item # 20.
Item # 19 is the needle of the carburetor for cylinder # 2 on the left-hand side of the engine.
Because it is not listed separately, and because the quantity is listed as 2, this indicates that carburetor # 4 also requires item # 19.
If I underdstood you correctly, I am not sure how how that could be accomplished without also changing where the FR. indicator is and this is not an option that is available. The longitudinal centre-line of the engine can not be rotated without also rotating where the front of the engine is.Your assessment of the diagram is valid, however, if you flip the line so it separates front from rear it also is valid
Yes I see your point, it will be interesting to come back to this when I get an official answer from Honda (probably in a few months time)If I underdstood you correctly, I am not sure how how that could be accomplished without also changing where the FR. indicator is and this is not an option that is available. The longitudinal centre-line of the engine can not be rotated without also rotating where the front of the engine is.
The location of the front of the engine I don't see as an issue for debate. Honda has defined it in this diagram by the FR. descriptor. They also defined which direction the front of the engine is facing by including the arrow in the bottom left of this diagram. This indicates not only where the front of the motorcycle is, but also in which direction it is facing.
By defining where the front of the engine and motorcycle are, and by defining its directional attitude, they have de-facto defined where the longitudinal centre-line of the engine is as well. This is because all of these items are in a fixed relationship to each other. None of them can be arbitrarily rotated without rotating the others the same amount in the same direction.
Anyway, that is my take on it.
It will be curious to see what they respond. If they state that it is indeed a FWD/AFT split, as opposed to the LH/RH split that I have illustrated above, I hope that their answer also contains an explanation of how that marries with the existing directional indicators already contained in their diagram.At some point I will hopefully get an official answer from Honda and will update