Yamaha DT175 Oil type confusion

[LanaTheGreat]

I just bought my wife a Yamaha DT175 at the end of November. This is a 2-stroke engine, and I am confused as to which type of oil should I use in the engine/gearbox. It has a separate container for the 2-stroke oil, and the engine has its place for the engine oil. I have no owner's manual, and no Workshop manual, and want to know which oil goes where. The previous owner told me that it must have 2-stroke oil in the 2-stroke conainer and in the engine.

I was under the impression that the engine should use normal multigrade engine oil in the engine/gearbox, and only 2-stroke oil in the container. I rode the bike on the highway full throttle (a massive 110Km/h for about 80km, with the 2-stroke oil in it.The engine has a knocking sound too, and I am not happy about it.

Should I drain the 2-stroke oil from the engine, or will it run fine on it as it currently is? Where can I get a workshop manual and owners manual for the bike, as I have searched all the links and pages of BCF but none is available for this bike. I need to keep the wife happy

Will the knocking sound go away with the right oil, or did the 2-stroke oil have caused the engine damage?

[ms51ves3]

The 2 stroke oil in the bottle goes into the engine lubricating the big end, piston etc. The gearbox (and clutch) is lubricated by 4 stroke oil that you will put it in through a little cap on the engine.

[Blau Zedong]

Half decent 2T oil in the plastic tank, 10W30 in the sump. 10W30 is hard to obtain so use cheap 4T multigrade if you can't get 10W30. Do not overfill the sump!
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18:54:48 Rob Fzs: jews don't give away stuff for free

18:54:59 Rob Fzs: unless its their clothes/ hair/ golden teeth

[Finglonga]

[Blau Zedong]

I think it's pretty fucking obvious what I mean by "sump"...i.e. the bit inside the engine casings which has a drain plug. The fact that it contains mainly gearbox bits on a 2T is neither here or there.
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18:54:48 Rob Fzs: jews don't give away stuff for free

18:54:59 Rob Fzs: unless its their clothes/ hair/ golden teeth

[adamcpi50sx08]

you can get proper 2 stroke gearbox oil now thats 10W30 even most car shops sell it, what i would do is, drop the oil that is in the gearbox (should be a sump bolt underneath the engine), it should say on the engine cases how much gearbox oil it needs, put the right amount in and i always add a extra 50ml or so to be on the safe side, keep the bottle topped up with good quality 2 stroke i use castrol tts 2t, never just guess what oil to put where and never let that oil tank run low because if ur riding and u run out more than likely you'll blow your engine
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CR 125 (OFFROADER) - DEP PIPE ETC
CPI 50 SX 2008 - NO MODS YET EXCEPT FROM A SET OF ACERBIS HANDGUARDS

[Finglonga]

[ms51ves3]

[LanaTheGreat]

Thanks for the replies. Would it have caused any damage to the engine/gearbox because it was having 2-stroke oil in instead of engine oil? I drove the bike about 80Km at 110km/h with the wrong oil in it. Would the knocking sound stop if I put in the correct oil, and will the 6th gear stop singing when driving?

[bladerunner]

2 stroke oil is not a multi grade(normally) which means as it gets hotter it also gets thinner. it's not designed for use in the gearbox but
I wouldn't have thought you'd have killed it in that short a time. So warm the motor up to thin the oil and refill with some cheap oil let it run till warm again and drop that oil as well just to flush out the remaining 2 stroke oil that would still be in the box. After that refill with the correct type oil. Most cheap multi grade car oil should be fine. None of the synthetic modern stuff mind unless it's designed for wet clutches.

What I would suggest is when you drain the oil thats in it now. Drain it into a clean container and look to see how many metallic particles are in it as they can hint at whats causing the noise.

I'm not sure as it's been a long time since I played with a DT175 but on the kick start side engine casing is there a 10mm head bolt with a screw driver slot in it that you remove with the bike level and fill till you see the oil coming out of the screw hole? if not it will be either a sight glass marked with high and low lines or a normal dip stick on the filler cap.

See how you get on if the noise is still bad..it's strip down time. If it is then can you take a vid of it on your phone and post it on you tube so we can have a listen

HTH

R
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Current bikes...cbr929, KDX200's, Rd125lc mk2, RGV250's

[Kickstart]

Hi

Does the knocking go away if you pull the clutch? If not then it suggests it is the engine rather than the clutch or gearbox. In which case the 2 squeak oil in the gearbox almost certainly didn't cause it.

All the best

Keith
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[LanaTheGreat]

The knocking does not go away when the clutch is released. The knocking stays the same under load and when idling. Could be piston slap I guess.

I have a workshop manual for a Yamaha DT125, and was wondering if I could use it for the DT175. Is there a big difference between the two engines?

[Kickstart]

Hi

Honestly don't know how similar the engines are. Suspect the air cooled DT125 is similar to the DT175, but wouldn't be certain.

Fair chance you can pick up an old DT175 manual on Ebay.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[Blau Zedong]

[LanaTheGreat]

I stripped the engine, ended up being piston slap. Going the oversized way now. Thanks for all your replies.