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Makotosun

Oil usage with auto lube

  • Youngdrakeo
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Replied by Youngdrakeo on topic Oil usage with auto lube

Mark. If we are going on how many tanks of fuel then its probably pretty close to 3 tanks of fuel to where its currently sitting in the oil tank. It does drink fuel now with the work. But totally worth it. 

Manifold is a early yz85, its stretched to its absolute max with the vm34. I don't expect it to last years. I will stock up on them actually. 

Yes sorry its castrol power one 2t (smells amazing) 
Someone did mention that too. The fully synthetic has a higher flash point? Maybe I should drain the tank and try some mineral oil before any other adjustments. Not even semi synthetic? 

Thanks for the replys!! 
73 CT3 modified, 74 AG175 MX, 79 YB100 x2 , 79 GT 80 ,2015 ducati scrambler ,honda CT70
25 Nov 2021 13:37 #11

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Replied by Youngdrakeo on topic Oil usage with auto lube

Thanks Deet! Will give it all a try starting with removing the banjo and trying a mineral oil. I really dont want to starting messing with the pump settings if I don't have too..
73 CT3 modified, 74 AG175 MX, 79 YB100 x2 , 79 GT 80 ,2015 ducati scrambler ,honda CT70
25 Nov 2021 13:41 #12

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Replied by MarkT on topic Oil usage with auto lube

I'd say three tanks of fuel to one of oil is certainly possible... 

To be more detailed, one thing I've seen many times on a "smoker" is oil pump cable adjusted so that the pump pin and marks are aligned perfectly with hand off the throttle....  basically "idle"...  BUT...  and yes this is a big "but"...  the throttle cable at the carb has an excessive amount of slack and the oil cable doesn't. 

So what happens is you twist the throttle and the oil pump pulley moves instantly and quite a bit before the slack in the throttle cable at the carb is taken up, the carb slide starts to lift, and the engine starts to rev. 

So check and see if pulley moves off the marks quite a bit before the slide starts to lift.

And yes, I've heard and been told the same thing by an engineer who claims that high quality mineral oil with a lower flash point will give you more power than a high flash point synthetic... the theory is the oil that gets into the combustion chamber can make power when it burns.  It does nothing for power when it goes out the exhaust unburned. 

Could be BS but I switched from a modern "smokeless" synthetic injection oil in my old bikes to the quality mineral oil he recommended (and for full disclosure, manufactured and sold) and saw far less smoke...
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 Nov 2021 14:37 #13

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Replied by Youngdrakeo on topic Oil usage with auto lube

From memory. (because I had to make my own cables to be able to run the vm34 and a quick action throttle with the pump. I can't slacken it off anymore without cutting some more thread. (Which I will do now) 
The pin & dot match up perfectly but the smallest amount of throttle movement moves the pump so I will slackin it off. 

Just went and got some Bel Ray mineral 2t oil to try 
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73 CT3 modified, 74 AG175 MX, 79 YB100 x2 , 79 GT 80 ,2015 ducati scrambler ,honda CT70
25 Nov 2021 15:04 #14

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Replied by Youngdrakeo on topic Oil usage with auto lube

Do I need to completely clear the lines of the old oil? Or just drain the tank?
73 CT3 modified, 74 AG175 MX, 79 YB100 x2 , 79 GT 80 ,2015 ducati scrambler ,honda CT70
25 Nov 2021 15:08 #15

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Replied by MarkT on topic Oil usage with auto lube

Some may disagree....  but the trick is to get the "slack" in the upper cable and then adjust the lower cables so the pump timing marks align when the slide just starts to lift.   

It doesn't need to be perfect...  what I've seen is no slack in the upper cable and then the carb cable is loosened  to get slack...  so pump ends up "rich".   

Anyway, lots of ways to do it... 

I doubt Castrol Synthetic is not compatible with other oils...  some synthetics are though.  I mix a little of each oil in a clear container and see if they separate out overnight or something.  If okay, and almost certainly will be, then I drain tank and feed line, fill with new oil, and then bleed at pump to get air out and new oil coming out.  I wouldn't worry about the oil in the pump or outlet side unless you had a compatibility issue where your oils didn't seem to mix well...  like oil and vinegar in a salad dressing. 

Some people just top off the tank with the new oil and don't worry about the little bit left in the tank.  I'm more paranoid than that.

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(I think the one time I had a mixing issue was with Motul and they had a warning on the label not to mix with other oils)
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
25 Nov 2021 15:33 #16

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Replied by shyted on topic Oil usage with auto lube

Regarding modern 2 stroke injection oil.
I too have ditched it out of all my bikes. All my bikes were fitted with genuine Yamaha hose from and to the pump. 
Motul and Castrol non Esther based oil has shrunk (Constricted) them. It's also made them brittle. That suggest there's some chemical in there that attacks the compound make up of the hose material and could possibly attack the seals. That bits speculation as i haven't seen it yet.
I bought mineral 2 stroke oil in bulk and now use that. Problem solved.
26 Nov 2021 02:12 #17

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Replied by Tinkicker on topic Oil usage with auto lube

Back in the mists of time I always ran Bel Ray SI7 in all my yam autolube two strokes (RDs and DTs); and over 1000s of miles,never had a smoking issue or a wet exhaust. Exhaust was pretty clean as was the number plate.  Only oil on there was chain lube.
I seem to vaguely remember getting around 5 - 600 miles to a tank of oil back then.

​​​​​When I bought my DT in July I was gratified to see SI7 was still available and a couple of bottles were sat in my shed before the bike was delivered.
Last edit: 27 Nov 2021 00:35 by Tinkicker.
27 Nov 2021 00:35 #18

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Replied by Tinkicker on topic Oil usage with auto lube

To be more detailed, one thing I've seen many times on a "smoker" is oil pump cable adjusted so that the pump pin and marks are aligned perfectly with hand off the throttle....  basically "idle"...  BUT...  and yes this is a big "but"...  the throttle cable at the carb has an excessive amount of slack and the oil cable doesn't. 

So what happens is you twist the throttle and the oil pump pulley moves instantly and quite a bit before the slack in the throttle cable at the carb is taken up, the carb slide starts to lift, and the engine starts to rev.
MarkT



This.
Setting the pump as the book says often sets the pump a little advanced as MarkT says.

What I do is get the engine warm enough to idle, turn the throttle to remove the free play in the cable and right at the point where the RPM starts to rise from idle speed, I adjust the pump cable so the pump marks line up.
27 Nov 2021 08:10 #19

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Replied by MarkT on topic Oil usage with auto lube

What I described was how the manual tells you to do it...  it just always doesn't get done that way...  and if someone has excessive slack at the lower carb cable, I've seen the pump rotate nearly 1/4" past the "idle" mark before the throttle slide starts to lift.

 


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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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27 Nov 2021 08:28 #20

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