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Air in oil lines - can't figure it out!

24 Oct 2020 19:39
Buffoni88
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Air in oil lines - can't figure it out! #1
Good evening! 1972 R5 - I can not for the life of me figure out what I'm doing wrong. My left cylinder oil line keeps getting air pockets, starting at the left cylinder side. I have replaced all of the hardware. I put clear Hipa lines on it (1/8") so that I can be put at ease that it's getting oil. It'll be fine at first, but after getting on the throttle, air pockets begin developing. The air is not coming from the pump (pump is rebuilt), I have watched it closely to make sure. I also swapped the lines at the pump, and it continued getting air in through the left side only. I'm using the stock setup with the circular metal sleeve that slides over it. Does anybody have a solution to this? Is there a different fitting I can use that won't allow air in? I eliminated the pump as the issue by switching the lines. Any help would be much appreciated!

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24 Oct 2020 20:12
MarkT
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Air in oil lines - can't figure it out! #2
Yamaha used black lines for a reason... what you're describing is not unusual... it's always the longer hose.

I've only seen one person ever solve it. Here's a link to his solution. (Mine is use OEM hose and clamps... OEM hose has a smaller ID which I believe helps...)

www.2strokeworld.net/forum/index.php?topic=2106.0

1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
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24 Oct 2020 20:33
Buffoni88
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Air in oil lines - can't figure it out! #3
Thanks for leading me to that forum! I went through the comments, and someone posted a link for some Yamaha oil check valves. I'm going to order one for each side, and hope that solves the problem. I wish my brain would just stop being paranoid and use the OEM lines, but I just can't bring myself to do it. Not after all the hours I put into the engine. Thanks again!

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24 Oct 2020 20:35
darinm
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Air in oil lines - can't figure it out! #4
I'm with Mark on this one, my '72 Yamaha has black lines but I had to replace the very small diameter molded lines on my '72 Suzuki 185 with lines like yours and no matter what I do (and I've done a lot), I get air bubbles in them and have learned to ignore them by now.

In that line of thought, small diameter lines don't seem to have the problem but you can't find any to fit the banjo bolts or other barbed fittings so not much to suggest on that front.

1972 Yamaha CT2 175
1972 Suzuki TS 185 Sierra
2016 Yamaha WR250R
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24 Oct 2020 20:55
Buffoni88
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Air in oil lines - can't figure it out! #5
For anybody else that sees this, here is the part number for a Yamaha oil pump check valve: 8CH-1316A-00-00 I will update once I receive and install it.
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24 Oct 2020 21:11
MarkT
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Air in oil lines - can't figure it out! #6
I liked your idea of a pair of valves. Adding more restriction to the longer line only might be a mistake.

As far as being paranoid... if pump does ever fail it's not likely the clear hose will help.

Best "paranoid" method is run premix and the pump. If jetted right you can run a ton of quality oil and it won't smoke bad or foul plugs.

1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250
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25 Oct 2020 06:31
Buffoni88
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Air in oil lines - can't figure it out! #7
That's true, Mark. I'm going to see how the check valves perform and go from there. I like your idea of just adding some premix to be sure, which is what I'm doing right now since the weather is perfect here in New Mexico and I've been itching to ride for months. Thanks for the response, cheers!

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26 Oct 2020 06:16
nhsteve
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Air in oil lines - can't figure it out! #8
I do know that HVC carries the line and the little metal clips, if you can't find them elsewhere.

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26 Oct 2020 06:20
MarkT
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Air in oil lines - can't figure it out! #9
Yamaha still sells the clip-clamps and original hose too

1963 YG1-T, 1965 MG1-T, Allstate 250, 1970 CT1b, 1971 R5, 1973 AT3MX, 1974 TS400L, 1975 RD350, 1976 DT175C, 1976 Husqvarna 250CR, 1981 DT175G, 1988 DT50, 1990 "Super" DT50, 1991 RT180, 2017 XT250

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26 Oct 2020 09:41 26 Oct 2020 09:41 by Gr8uncleal.
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Air in oil lines - can't figure it out! #10

MarkT wrote: Yamaha still sells the clip-clamps and original hose too


+1

If my memory isn't playing tricks on me, part number has superseded at least once and you'll be supplied with a fixed length that you cut as required - you'll get more than is needed.

Same caveat on the memory front, I think that it is the same hose as supplied for carb breathers.

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