Athena 170
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Why is it you think a bigger piston needs more oil?
It needs about 2%, just like a 50cc bike, and just like a 500cc bike.Fill the gastank and oiltank to the brim. Keep and eye on how much petrol you add, and how much oil you have to top up for a couple of tanks. Do the math, and work out the ratio the stock pump is giving you. You can still add 1% extra oil directly in the gastank while testing if you want.
Just putting around, the pump will probably only supply 1,5% which is fine. At WOT youre closer to 3%.Thats the beauty of the pump, it gives you excatly the amount of oil you need.
Cant wait to hear your thoughts about the kit.
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Yes... after modifications your engine will need more fuel to compensate for the added air the engine now consumes, but that's your air to fuel ratio. Proper jetting gets you into the "happy spot" where you should be... not too lean and not to fat. The lubricating oil in an oil injected engine delivers the correct amount of oil regardless of how your jetting is. The stock oil injection system gets blamed a lot when an engine failure happens because of a lean condition caused by improper jetting (operator error).
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Everybody gets sucked into the rumor mill crap, because they hear bull sh#t like the following...
"My brothers uncle's next door buddy has a friend,that has a friend,who knows a guy,that lives in the garage attic at his grand mothers house,that had the "Auto Lube" pump fail on his Yamaha DT".All the negative stories I hear about The Yamaha "Auto Lube" oil injection systems crack me up! I've never heard or seen a "worn out injector pump", or "broken gear", or any failed part pertaining to the "Auto Lube" injection system. EVER.
The are no parts in the pump that can actually fail. The Delron gear feeds into the main shaft. The main shaft has a worm gear built into it. That worm gear turns another shaft on an eccentric. That eccentric moves a very small plunger "piston" in and out.
I'm still am waiting to "see" proof of all the "Failed" components from this system that everybody says happens all the time. Good luck with that! I'm always hearing about the "delrin drive gear" breaking. Yeah right. I'm always hearing about the "injection pump" failing. Yeah sure..lol
If need to increase oil flow it is very easy, undo the M8 locknut, washer, adjustment plate washer and add 0.1mm Shims as arrowed in exploded view.
I am a retired motorcycle engineer with over 35 years working on engines, also over 30 years porting 2 stroke rc engines both petrol and nitro motors. Been building modifying and designing .21 nitro race engines for 1/8 scale rallycross buggys for 25 years and know a lot on 2 stroke engines, porting etc.etc.
So if anyone is into nitro rc 1/8 buggys or truggys and need help, mods, porting, sleeve resizing, anything engine related can help. Also anyone wanting anything 1/8 scale nitro or .21 race engine parts have tons of gear as retired now, have a few race truggys, engines, radios etc, fuel etc if anyone wants anything have lots of gear.
Don't mean to be sarcastic about pump failures only can go on my experience and mainly due to lack of maintenence, dirt in oil tank from not cleaning under lid etc before refitting usual causes also worn
bearings in crankcase . -
Can only say what I found, bought "restored " Dt250mx circa 1976 running on premix. Keen as ever to have as original as possible reconnected all parts to oil pump and bled system. No, it did not work at all, persevered without success so took off machine and checked drive gear was all intact (you never know) and all ok, just did not pump oil. No idea how long it had been disconnected or why, had it rebuilt for a measly cost and came back like new working. Did get some pics given to me at purchase showing condition prior to resto so will try and post some shortly to show condition. Don't discount the obvious because you have never seen it.
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As said, I've got no reason to lie about it, my Belgarda pump was foobar'd and I'm not an idiot lol. I even took it into Yamaha Skellerns Cheltenham, where Rob told me the pump was not serviceable.
Why would they turn down work? I can only go on my experience. To be honest with you, I could show you photos of the engine, and having dirt being drawn into the pump could have been highly likely.
I mean that was the state of the head, the gasket was on upside down and it was still obviously ridden. So yeah, having a poorly maintained engine would be a good cause for suspecting the pump could fail.
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Anyway, let's get back to the topic. My pump is working like a charm, and with some transparent oil lines I feel a lot more confident with it. But I mean this is the life of owning a two stroke isn't it? You can't be sure it won't break, fuss about or even start in the morning. I'll make sure the mixture is spot on and gradually move towards using only the autolube. Then we'll see if it breaks or not.
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@irongamer727 The DT is a rugged motor, you'll be hard pressed for it to break if you look after it. Always use decent oils and just keep an eye on the gauge mate and you'll be fine.
Aprilia on the other hand...they are temperamental.
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About 3km done on the dt170. Feels like a totally different bike. I'm still nervous as hell that something will fail but everything seems to work. Not bogging one bit, still quite cold outside ofc and I have not tried the upper revs.
Smoking beautifully and seems to be running rich (according to spark plug). Think I will keep this setup during the brake in. Soon time for another trip
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@irongamer727 Leave it standard and Yamaha have done all the research to make it perfectly reliable.
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@calum Yamaha? Are they involved in the making?
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@irongamer727 No, you said two strokes are unreliable. They're not unreliable, they require more maintenance sure. But you've now modified something that Yamaha spent thousands designing and refining. You haven't spent thousands ensuring this will run reliably, thus you must except the potential for it to be unreliable.
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Not sure if anyone is interested. Either way just finished my first 25km ride with the kit. Still feels really nice. However a break in isn't in any way fun. But it'll soon be over.
Here's a couple of pictures of her. Tell me if you can see them. New to this photobook thing.
http://s58.photobucket.com/user/Irongamer727/library/?page=1&sort=3
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Good for ya, cant wait to hear your thougts once you've flogged it a bit
Pictures is showing fine in the link
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@jens-eskildsen I'll update this thread as I get more experience with it. How was the pictures? Blurry? HD?
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@irongamer727 Create an imgur account, photobucket compresses your images.
Definitely look at getting a Zeeltronic for your bike. It will make such a difference with that 170 kit.
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@calum I've already spent what I consider A LOT on this DT. Also have an NSR now. Ordered a stainless Romeu Henriques pipe for it. The DT is either way never going to be a performance machine. The Honda however..
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@irongamer727 Yeah, and it'll be a shame not to make the most of it. A Zeel will allow you to unlike the full potential of that Athena.
Having done everythng under the sun for these DT's, Athena Big Bore, TZR RR Belgarda engine, the single one most thing I can recommend, is the ignition system.
