The New And Improved Unofficial R65 Forum V2
Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: buzza on June 15, 2016, 02:06:27 AM
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Hi All. I recently removed the pilot jet from my RHS carb and blew it through with air to clean. I noticed that when I sucked through from the screw driver slot end there appeared to be an obstruction ie I couldn't see through it. When I sucked from the other end it appeared to clear. Is there a reason for this or does it indicate a blockage? If it's a blockage it dos'nt seem to want to move.
If I have to replace a jet is it best to do similar on the other carb. also?
Finally is there a trick to getting the O-rings on the jet easily?
Steve
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Hi All. I recently removed the pilot jet from my RHS carb and blew it through with air to clean. I noticed that when I sucked through from the screw driver slot end there appeared to be an obstruction ie I couldn't see through it. When I sucked from the other end it appeared to clear. Is there a reason for this or does it indicate a blockage? If it's a blockage it dos'nt seem to want to move.
If I have to replace a jet is it best to do similar on the other carb. also?
Finally is there a trick to getting the O-rings on the jet easily?
Steve
A piece of stiff nylon, say from a scrubbing brush or a dog's hair brush, held in a pair of pliers is ideal for clearing jets. Do not be tempted to use steel, so-called "jet cleaners" as you will inevitably upset the flow characteristics of the jet using one them to clear/clean the jet.
If you do decide to replace your carb jets, like for like is the key
O-rings can be a PITA. Go to your local chemist or GP and obtain some of the conical guard caps sold with syringes - cut to length, then place over the jet and finally slide the O-ring up the cone until if falls into place.
Some second hand dentist picks are perfect for getting the old O-rings off (and putting new ones on). Befriend a dentist (like accountants they have difficulty making friends and they will be grateful) or buy 2nd hand from eBay or new from China for about the same price.
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A wee bit of plumbers grease will smooth the o-ring installation. Roll on the o-ring, being sure it ends up in its original shape. Wipe off excess before refit of the brass jet.
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I noticed that when I sucked through from the screw driver slot end there appeared to be an obstruction ie I couldn't see through it. When I sucked from the other end it appeared to clear. Is there a reason for this or does it indicate a blockage? If it's a blockage it dos'nt seem to want to move.
Pilot jets have emulsion air holes on the inner section so the the size of the bore seen from that end is much larger to accommodate the air/fuel mix. The small fuel jet hole is better seen from the bottom or screw driver slot end. The jet hole is so small (something under 0.5mm or 0.020") it can often look blocked just because there is still some fuel in it.
To help mount the O ring without damage I put a few turns of ptfe tape over the threads and slide it on over the tape.