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Post by zig on Apr 25, 2022 21:15:47 GMT 1
anyone know were to purchase some clear 2 stroke oil pipe
i know M&P do it but want £12.99 + £8.75 p&p for 5 meters
surely there is someplace else somewhat cheaper . ... . anyone?
ZiG
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Post by shaunthe2nd on Apr 25, 2022 23:34:41 GMT 1
Save your money and stick with originals. Clear pipes notorious for air leaks.
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Post by bare on Apr 26, 2022 2:49:27 GMT 1
Most any building centre Clear plastic tubing Works... jes Fine
Clear tubing allows one to seee when / IF the oil is actually flowing.. Important that :-)
Cheap clear tube.. Does eventually age harden and the colour of the oil does tint it .
So What !? .. Splurge the Dollar or 2 price.. next spring, to fit new replacement.
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Post by zig on Apr 27, 2022 7:36:54 GMT 1
i appreciate the feedback but this is not just for looks i really like the fact that when you have a new build you can physically see the oil running and doing it's job but with the standard pipe
plumbed you are really relying on visually seeing the difference from the exhaust smoking with your pre-mix
and yes after a while of run in i would replace with the Yamaha standard.
ZiG
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Post by JonW on Apr 27, 2022 13:45:03 GMT 1
Its good that its clear so you can see the air bubbles form in it  OEM all the way for me... |
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Post by chrisg on Apr 27, 2022 15:59:04 GMT 1
Its good that its clear so you can see the air bubbles form in it  OEM all the way for me... There is a theory that "some" none standard oil lines become more compliant with heat and allows the oil within the line to be sucked through faster than the pump pumps, allowing air bubbles. (if that makes sense) . Dont shoot the messenger  |
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Post by dougw on Apr 27, 2022 16:05:09 GMT 1
Been using clear from MandP for 18 months now, was still clear and not hardened last weekend when I was playing with the carbs.
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Post by 4l04ever on Apr 27, 2022 21:11:00 GMT 1
It is good to have the OEM black oil pipes, so you never know if today is the day the oil stops pumping through...and the rebuild begins ;-)
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Post by steeley on Apr 28, 2022 6:19:55 GMT 1
i appreciate the feedback but this is not just for looks i really like the fact that when you have a new build you can physically see the oil running and doing it's job but with the standard pipe plumbed you are really relying on visually seeing the difference from the exhaust smoking with your pre-mix and yes after a while of run in i would replace with the Yamaha standard. ZiG Some years back i rebuilt a 350ypvs engine for a mate . Some years later he had a nip up on the one cylinder . Barrel off bore clean up and new piston i primed the oil line with a different colour oil and started the bike and noticed it wasn't moving along the pipe . This led to the carb being removed and the oil feed on the carb was found to be blocked . www.ebay.co.uk/sch/i.html?_from=R40&_nkw=chainsaw+fuel+pipe&_sacat=0&_pgn=2 |
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Post by arrow on Apr 28, 2022 6:53:47 GMT 1
i appreciate the feedback but this is not just for looks i really like the fact that when you have a new build you can physically see the oil running and doing it's job but with the standard pipe plumbed you are really relying on visually seeing the difference from the exhaust smoking with your pre-mix and yes after a while of run in i would replace with the Yamaha standard. ZiG Some years back i rebuilt a 350ypvs engine for a mate . Some years later he had a nip up on the one cylinder . Barrel off bore clean up and new piston i primed the oil line with a different colour oil and started the bike and noticed it wasn't moving along the pipe . This led to the carb being removed and the oil feed on the carb was found to be blocked . www.ebay.co.uk/sch/i.html?_from=R40&_nkw=chainsaw+fuel+pipe&_sacat=0&_pgn=2 Exactly! So the clear pipe still had oil in, all looked well and the engine still seized. What I mean is, the lack of movement couldn't be observed. After such a seizure everyone checks the whole oil circuit is clear, right through to the tiny outlet holes in the carbs. Don't they?? Surely?? |
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Post by steeley on Apr 28, 2022 7:31:57 GMT 1
Some years back i rebuilt a 350ypvs engine for a mate . Some years later he had a nip up on the one cylinder . Barrel off bore clean up and new piston i primed the oil line with a different colour oil and started the bike and noticed it wasn't moving along the pipe . This led to the carb being removed and the oil feed on the carb was found to be blocked . www.ebay.co.uk/sch/i.html?_from=R40&_nkw=chainsaw+fuel+pipe&_sacat=0&_pgn=2 Exactly! So the clear pipe still had oil in, all looked well and the engine still seized. What I mean is, the lack of movement couldn't be observed. After such a seizure everyone checks the whole oil circuit is clear, right through to the tiny outlet holes in the carbs. Don't they?? Surely?? |
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Post by steeley on Apr 28, 2022 7:47:47 GMT 1
Some years back i rebuilt a 350ypvs engine for a mate . Some years later he had a nip up on the one cylinder . Barrel off bore clean up and new piston i primed the oil line with a different colour oil and started the bike and noticed it wasn't moving along the pipe . This led to the carb being removed and the oil feed on the carb was found to be blocked . www.ebay.co.uk/sch/i.html?_from=R40&_nkw=chainsaw+fuel+pipe&_sacat=0&_pgn=2 Exactly! So the clear pipe still had oil in, all looked well and the engine still seized. What I mean is, the lack of movement couldn't be observed. After such a seizure everyone checks the whole oil circuit is clear, right through to the tiny outlet holes in the carbs. Don't they?? Surely?? Hi Gary , before i put the oil pipes on now i force oil through a spare piece of pipe with an oil can . As i said in my post if i had not used a different colour oil we would be none the wiser . The original seize knowing the chap ,i put down to hard riding while not up to temperature . Every day is a School day |
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Post by arrow on Apr 28, 2022 8:14:25 GMT 1
Yep, I had a blockage in one of the carb oil holes, AFTER the carbs. we're professionally cleaned! It's a very important check.
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Post by zig on Apr 29, 2022 18:04:17 GMT 1
being a dry build and not having Gary do the pump on this one i am not sure about it hence i have the carbs checked and i know the oil way is clear all i need for peace of mind is to actually see the pump do its thing through the lines to carb and once i see that thing smoke like a train when the oil hits the carbs good to go i think ZiG |
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Post by elsiefan on Sept 3, 2022 12:28:16 GMT 1
Yep, I had a blockage in one of the carb oil holes, AFTER the carbs. we're professionally cleaned! It's a very important check. I also had an intermittent blockage in one of the carb oil jets, caused by a previous owner crimping the oil feed pipe to the carb between the clutch cover! A tiny piece of the pipe broke off, got into the carb oil jet and would cause intermittent oil starvation and additionally blew the oil line off the pump, despite using new pipes and clips. As Gary says, very important to check!  IMG_20210407_193517 |
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Post by beardy on Sept 3, 2022 15:15:33 GMT 1
Its good that its clear so you can see the air bubbles form in it OEM all the way for me... There is a theory that "some" none standard oil lines become more compliant with heat and allows the oil within the line to be sucked through faster than the pump pumps, allowing air bubbles. (if that makes sense) . Dont shoot the messenger I like that theory. Since Arrow rebuilt my pump approx 5 years ago. I did exactly what he didn’t recommend and fitted clear lines with the standard clips. I’m sorry for going against the guru’s advice but in my head it didn’t sit right that I couldn’t see oil in my lines. And I have noticed bubbles when I first fitted the pump even after bleeding and unclipping the lines from the carbs and hanging them virtically overnight. I’ve since done thousands of miles and hardly ever see a bubble now and even when I do it’s no big deal as it tends to stay at the highest point and the oil flows around it. The black pipes remind me of Schrödinger’s cat paradox. |
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Post by Tobyjugs on Sept 3, 2022 16:08:54 GMT 1
I've got no real input for this thread except, if it's all working as it should how can you see the oil flowing through the clear pipes?
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Post by beardy on Sept 3, 2022 16:16:45 GMT 1
I've got no real input for this thread except, if it's all working as it should how can you see the oil flowing through the clear pipes? Because the bubbles pulsate 👍🏻 |
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Post by arrow on Sept 3, 2022 19:24:22 GMT 1
Some clear pipe is bigger outside diameter than standard and the Yamaha retainers don't work properly, ie they don't fit all the way round the pipe, leaving a gap.
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Post by andy748 on Sept 3, 2022 20:49:05 GMT 1
I go clear on mine, Norbos stuff, holding up well, nice and supple after 2 years, i'd be more worried about the amount of rebuilt bikes i see with no oil line clips fitted at all, spoil the ship for a ha'peth of tar springs to mind. Andy.
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Post by Tobyjugs on Sept 4, 2022 5:12:56 GMT 1
I've got no real input for this thread except, if it's all working as it should how can you see the oil flowing through the clear pipes? Because the bubbles pulsate 👍🏻 So there is always bubbles present? Maybe that's why they use black lines. To stop people panicking. |
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Post by beardy on Sept 4, 2022 8:05:46 GMT 1
Because the bubbles pulsate 👍🏻 So there is always bubbles present? Maybe that's why they use black lines. To stop people panicking. Sorry, that was a poor attempt at a joke by me. This year I haven’t seen any bubbles at all. And you are right in saying that if everything is working as it should then you can’t see the oil moving. What I have observed is that if you do get a bubble you can see it pulsate/wobble. |
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Post by steve63 on Sept 4, 2022 8:35:25 GMT 1
A mates 350 seized on one side but all seemed ok with the pump. The problem was the oil feed hole in the carb was blocked. It was in the days before ultrasonic cleaners for the home mechanic. We couldn't get it clear so he bought another carb. After cleaning I always put some oil in the brass stub and blow it through with air then see the oil in the carb outlet. I put the pump on full by pulling the cable and watch for oil to start coming out of the pipe before putting the pipe back on. I think that is per manual but I've not read that bit for ages. I don't worry about sticking any pre-mix in for the pipe priming, it's not going to seize at tickover for 30 seconds is it? Anytime I strip an engine there's always loads of oil in there. If there wasn't I would know that that was the problem I'm stripping it for! The same reason they don't seize just because you coast up to a corner with the throttle closed. Some people seem to think they do.
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Post by linx on Sept 19, 2022 9:49:14 GMT 1
anyone know were to purchase some clear 2 stroke oil pipe i know M&P do it but want £12.99 + £8.75 p&p for 5 meters surely there is someplace else somewhat cheaper . ... . anyone? ZiG Got mine from Yambits. Not had any problems |
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Post by elsiefan on Sept 19, 2022 17:36:08 GMT 1
anyone know were to purchase some clear 2 stroke oil pipe i know M&P do it but want £12.99 + £8.75 p&p for 5 meters surely there is someplace else somewhat cheaper . ... . anyone? ZiG Got mine from Yambits. Not had any problems I have seen clear hoses for both the tank and carb feeds, on Norbo's shop page on here www.rdlccrazy.co.uk/html/for%20sale%20page%202.%202%20350lc%20.htm |
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Post by markrd250lc on Sept 20, 2022 16:47:57 GMT 1
Got clear hoses on the LC, fitted them to every two stroke i have/had, checked the DT yesterday and noticed the oil had run back from the carb so i take there is an issue with the non return valve in the pump? as there isnt any evidence of a leak, i wouldn't have spotted this with black pipes or is it the clear line causing the issue  Mark |
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Post by arrow on Sept 20, 2022 18:01:13 GMT 1
Got clear hoses on the LC, fitted them to every two stroke i have/had, checked the DT yesterday and noticed the oil had run back from the carb so i take there is an issue with the non return valve in the pump? as there isnt any evidence of a leak, i wouldn't have spotted this with black pipes or is it the clear line causing the issue Mark The issue is caused by the clear pipe! A short column of air in the oil pipe at the carb end after cool down. They are not made from the same material as the original pipe which is still available from Yamaha. Running at the back of the cylinders the pipes get pretty hot in use. As they are under constant vacuum when the engine is running the diameter goes slightly smaller. When they cool down and go back to original size, this shows up by the air space at the carb end. This is bad news for the engine. The engine is getting starved of oil on start up’s and its cumulative. Fit the correct spec. black lines and make up a temporary 25mm length of clear on the carb end as a test. You can use the inner piece of a Biro pen to join the two together. There will be no air observed. Rest assured in this condition the oil pump check valves are working correctly, if not then they would hide the issue, because then the flow of oil to the carbs would push the air through. |
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Post by markrd250lc on Sept 20, 2022 19:14:57 GMT 1
Got clear hoses on the LC, fitted them to every two stroke i have/had, checked the DT yesterday and noticed the oil had run back from the carb so i take there is an issue with the non return valve in the pump? as there isnt any evidence of a leak, i wouldn't have spotted this with black pipes or is it the clear line causing the issue Mark The issue is caused by the clear pipe! A short column of air in the oil pipe at the carb end after cool down. They are not made from the same material as the original pipe which is still available from Yamaha. Running at the back of the cylinders the pipes get pretty hot in use. As they are under constant vacuum when the engine is running the diameter goes slightly smaller. When they cool down and go back to original size, this shows up by the air space at the carb end. This is bad news for the engine. The engine is getting starved of oil on start up’s and its cumulative. Fit the correct spec. black lines and make up a temporary 25mm length of clear on the carb end as a test. You can use the inner piece of a Biro pen to join the two together. There will be no air observed. Rest assured in this condition the oil pump check valves are working correctly, if not then they would hide the issue, because then the flow of oil to the carbs would push the air through. Aha i now understand but this doesn't happen to the LC (not used for a year) only the DT175 if i leave it for a couple of weeks without use, so would this still be the clear pipe or a vacuum issue, the clear pipe for both came from the same length. plus, the DT oil pump was installed by a someone who shouldn't be allowed near a 2 stroke (no stroke on idle/ pump not bled and a cable repair nipple fitted to the pully preventing it from rotating), the bike was recently converted back to road spec from trails and was premixed before i got it. and thanks for the info/knowledge, very helpful. Mark |
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Post by arrow on Sept 20, 2022 19:48:15 GMT 1
It doesn't happen all the time. May be the dt runs a bit hotter than the lc, with different pipe routing. Also, as said any passing of the check valves hides the issue. And don't forget its not just the pipe that's empty at the end but the drilling in the carb right through to the tiny exit hole.
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Post by keith101 on Oct 7, 2022 10:24:30 GMT 1
I would say you will get air in your oil lines black or clear. If the system is sound it can still occur due to dissolved air in the oil, usually caused by agitation. Think of the vibration from the engine the oil in the tank is not a sealed system and so oil bubbles will form and then be sucked down and I'm talking about microscope size,agitated by pump, Engine stops air will rise to the top and form together and then we see them. Dissolved air it really is a thing 😀
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