I would like to find a fuel filter that works at the fuel tank inlet catching dirt etc. before it gets in the tank. I of course have the little tiny screens at the petcock inlet and the screen at the 2011 carb inlet. I have seen Guglatech filler cap filters advertised for other bikes, but none for KLRs.
Due to the locking bar of the KLR fuel cap you probably won't find an in-tank filler neck filter bag to Install & Forget! May have to remove it after each fill-up.
But I also know that you are a 'pretty crafty' old fart!
I just stuck a caliper into the neck of a Gen 1 and measured 1 & 11/16". Next I have a Twin-Air 160610 filler neck filter sock to fit KX250 - 450 F models.
The OD of the sock attachment black plastic measures 1 & 3/4". If the upper flange was segmented and the sock attachment was mostly 'slit' it might pass thru the upper neck and engage the lower neck.
This Fuel filter sock had a retail price of $34.95 when I ordered it, sometime back.
A quick measurement on mine showed 1.63". Close to the 1 & 11/16" you measured. I am thinking I will not find a perfect fit, but the Twin-Air 160610 would drop in well enough to filter from a nozzle or a funnel. I could then drop the the filter into a mesh sack tied to the back of my tail box.
Might do a better job than the cheesecloth used by trailside vendors (pouring from re-purposed gallon milk containers).
Riding in primitive areas of the world, might be worth the price.
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