Inside diameter oil pump lines
Moderator: rztom
Inside diameter oil pump lines
Does anyone know what the inside diameter is for the oil line to the carbs and the IO for the larger line that goes into the pump is from the 2stroke tank? Looking for tygon lines for both of them.
Re: Inside diameter oil pump lines
Whats wrong with OEMs? Most of the clear tubes cause air bubbles.
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Re: Inside diameter oil pump lines
Cleared that up fer ya.JonW wrote:..................Most of the clear tubes cause air bubbles to be visible.
There is only one difference between a madman and me. The madman thinks he is sane. I know I am mad.
Salvador Dali
Salvador Dali
Re: Inside diameter oil pump lines
LOL. Arrow will weigh in soon, but the info is out there about the bubbles...
80 XT500 Supermoto!
81 RD350LC Resto
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82 RD350LC decapitation project
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Re: Inside diameter oil pump lines
I will contact Gary direct on this issue. Bubbles? Sounds like a sealing problem.
Re: Inside diameter oil pump lines
The issue with the clear pipe (outlet) is that it goes very soft when hot and the constant vaccume in it causes it to change size in use (go smaller). When it cools down and goes back to standard size this shows up as a column of air at the carb end. This does not happen with the (gen) black lines and I've both proved it and documented it many times!
Basically made up some short clear adapters to prove.
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Basically made up some short clear adapters to prove.
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Re: Inside diameter oil pump lines
I have already stated in the past that not everyone experiences this issue.
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Sent from my SM-A520F using Tapatalk
Re: Inside diameter oil pump lines
Gary also mention to me that the "The internal diameters for the inlet and outlet are 3mm and 2mm respectively. That is the bore size of the stubs. The pipe bore sizes are 6mm and 3mm." Checked material data sheet for Tygon fuel and lubicating tubing. Its is stable up to 165F / 74C at 1821 psi. Not sure if it gets that hot in the oil pump compartment to cause the bubbling issue. I was thinking clear tubing to monitor whether oil was flowing to the carbs.
Re: Inside diameter oil pump lines
If you need to monitor oil flow then fit a very long length and loop it over the handlebars! If no bubbles are present you won't see any flow anyway.
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Re: Inside diameter oil pump lines
I'd loop them to the mirrors (lol). Ach, clear or not is the question. Don't doubt the pumps will work for the next 20 yrs or so as long as I spray grease monthly as suggested. Note Norbo sell clear tubing, hmm. Ponder time.
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Re: Inside diameter oil pump lines
OEM black for me, but people have their own choices. That's fine.
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Re: Inside diameter oil pump lines
No clear for me... I removed it (the stuff I got from Norbo I think) and went back to black a few years back.
80 XT500 Supermoto!
81 RD350LC Resto
82 RD421LC Hybrid
82 RD350LC decapitation project
82 RD250LC JDM '251LC' YPVS
83 RZ350 Resto
84 RZ500 Resto
85 RZ350 F1 Resto
86 RZ350 F2 Resto
86 RZ350 F2 Hybrid
Like Watches? www.PloProf.com & www.DeskDivers.com
81 RD350LC Resto
82 RD421LC Hybrid
82 RD350LC decapitation project
82 RD250LC JDM '251LC' YPVS
83 RZ350 Resto
84 RZ500 Resto
85 RZ350 F1 Resto
86 RZ350 F2 Resto
86 RZ350 F2 Hybrid
Like Watches? www.PloProf.com & www.DeskDivers.com
Re: Inside diameter oil pump lines
I've used the clear hardware store stuff before and it goes hard in no time, I can see the logic in what Arrow says. I have tried several types and settled on the Tygon stuff that RC guys use for nitromethane. I never get bubbles and don't even use clips on the ends, the stuff is almost impossible to pull off the fittings. That is for the lines from the pump to the carbs, from the oil tank I use a clear (slightly pink) tubing sold by Royal Distributing as fuel line, it feels and behaves like Tygon but is unlabelled. My local RC store said they could order Tygon in that size if I wanted a whole roll but I've never found the need. If you get bubbles in that line while riding you have a bigger problem.
Re: Inside diameter oil pump lines
You don't have to order a whole roll. Found you can purchase 3 ft at a time for tygon black, clear, or grey in Canada:
https://fortnine.ca/en/motion-pro-premium-3ft-fuel-line" onclick="window.open(this.href);return false; ... and did.
https://fortnine.ca/en/motion-pro-premium-3ft-fuel-line" onclick="window.open(this.href);return false; ... and did.
Re: Inside diameter oil pump lines
I bought the oem Black Yama oil lines from the dealers.
These were surprisingly inexpensive, only a couple of $.. to add insult to injury.
Still sold as fitments for their Scooters even
These were surprisingly inexpensive, only a couple of $.. to add insult to injury.
Still sold as fitments for their Scooters even