Author Topic: Yamaha Nitro / BWS Petrol : 2T ratio  (Read 161 times)

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Offline Vincent

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Yamaha Nitro / BWS Petrol : 2T ratio
« on: September 06, 2017, 08:32:18 AM »
Hi Guys

Just wanted to find out if anyone knows what the ratio for the mix should be... I know there's a auto lube pump, but it's mechanical, so something can go wrong....

I filled up on fuel and 2T a while back, and then again this morning in order to work out how much 2T I use.

I put in R70's worth of petrol, which, with the new, inflated price is 6.2l. Then, I put in about 400ml.

That gives a ratio of 15.5 : 1.

Does that sound about right?

I'll contact my mechanic (Spy) and ask him as well, and Mr Google to see what their valued opinions are, but also value the opinions of my fellow forum members...
  • Yamaha XT 550 / Yamaha Nitro 100cc


Offline Stanthescooterman

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Re: Yamaha Nitro / BWS Petrol : 2T ratio
« Reply #1 on: September 06, 2017, 09:24:29 AM »
I wouldn't bother.

The chances of your auto-lube failing are very remote, if not close to zero.
The chance of your pump control cable failing are greater, which is why it is a god idea to service your bike regularly, so that these kind of expensive surprises can be avoided. This is why it is called preventative maintenance :-)

You will know when your throttle becomes magically lighter and less resistant, that your pump cable has snapped.
It usually goes right at the end where it connects to the pump.
It is easily visible and shouldn't catch you by surprise.

I wouldn't bother with the stress and hassle of premix, not unless you were running it on the track and the motor was highly modified, which yours is not.
Previous bikes & scooters:
BMW C600 Sport
Kymco Grand Dink 250 (300),
BMW F650GS Dakar,
Gilera Runner 180,
Kymco Agility 125,
Kymco TB100,
Kymco Heroism KH125,
Honda CBX550FII,
Suzuki RG50 Gamma

Offline Vincent

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Re: Yamaha Nitro / BWS Petrol : 2T ratio
« Reply #2 on: September 07, 2017, 10:24:08 AM »
I'm just concerned about carbon build up on the piston, as I had to replace the piston on 14 000km....

And, also, currently petrol costs R11,29/l, and when you add the cost of the 2T oil, it's costing me R17,10/l.

That's with my Castrol P1 that I'm getting from a place up the road at R90 per litre.... If I were to buy from a less cheap place, and a more expensive oil, like Motul Micro 2T, that pushes it up to R31.06/l!

(btw, who pays R306,45 per litre for 2T oil?!)

No wonder our scoots don't get to run on the good stuff! Well, non-racing scoots, at least!

Also, would the pump cable snapping not mean that I use less 2T oil?
  • Yamaha XT 550 / Yamaha Nitro 100cc


Offline Stanthescooterman

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Re: Yamaha Nitro / BWS Petrol : 2T ratio
« Reply #3 on: September 07, 2017, 12:09:10 PM »
Yes, if your pump cable snaps, you will use less 2-stroke oil. In fact you'll be using less scooter as well  :rofl:

R90/L for castrol Power1 is farking cheap.

If you run pre-mix, you have no control over how much or how little oil your motor gets when it needs it.

Autolube gives you less when you need less and vice-versa.

If you're worried about carbon build up (and running costs), then rather buy a scooter with a 4-stroke engine ... that's one of the reasons why we can't buy new 2-stroke scooters any more.

You minimise carbon build up, by

a) setting your auto-lube correctly
b) not running on mineral oil
c) not using the bike just for short trips
« Last Edit: September 07, 2017, 12:10:14 PM by Stanthescooterman »
Previous bikes & scooters:
BMW C600 Sport
Kymco Grand Dink 250 (300),
BMW F650GS Dakar,
Gilera Runner 180,
Kymco Agility 125,
Kymco TB100,
Kymco Heroism KH125,
Honda CBX550FII,
Suzuki RG50 Gamma

Offline Vincent

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Re: Yamaha Nitro / BWS Petrol : 2T ratio
« Reply #4 on: September 11, 2017, 10:35:09 AM »
Ok, adjusted the autolube pump. Now just need to refill the 2T oil and fill up on petrol to check if this makes a difference....
  • Yamaha XT 550 / Yamaha Nitro 100cc

Offline Stanthescooterman

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Re: Yamaha Nitro / BWS Petrol : 2T ratio
« Reply #5 on: September 11, 2017, 10:37:33 AM »
Ok, adjusted the autolube pump. Now just need to refill the 2T oil and fill up on petrol to check if this makes a difference....
Makes a difference to what?

Your auto-lube is correctly set when you can just-just see smoke from your tail pipe at idle with a hot (not warm) engine & there might be barely detectable traces of oiliness at your exhaust tip

Edit: what have Adrian's views been on the matter?

PS: a lot of auto-lubes are set to over-deliver because of fear of oil starvation.
« Last Edit: September 11, 2017, 10:44:43 AM by Stanthescooterman »
Previous bikes & scooters:
BMW C600 Sport
Kymco Grand Dink 250 (300),
BMW F650GS Dakar,
Gilera Runner 180,
Kymco Agility 125,
Kymco TB100,
Kymco Heroism KH125,
Honda CBX550FII,
Suzuki RG50 Gamma

Offline Vincent

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Re: Yamaha Nitro / BWS Petrol : 2T ratio
« Reply #6 on: September 11, 2017, 12:26:34 PM »
Ok, adjusted the autolube pump. Now just need to refill the 2T oil and fill up on petrol to check if this makes a difference....
Makes a difference to what?

Your auto-lube is correctly set when you can just-just see smoke from your tail pipe at idle with a hot (not warm) engine & there might be barely detectable traces of oiliness at your exhaust tip

Edit: what have Adrian's views been on the matter?

PS: a lot of auto-lubes are set to over-deliver because of fear of oil starvation.

To see if it uses less oil... There are two marks on the pump that need to be aligned, which weren't. So I aligned them. (Not sure how to post pics, otherwise I would post the diagram...) The pump wasn't stuck open, but it was set to feed more oil than what it was supposed to...

Adrian said the ratio should be about 30:1, and that I should clean and oil the pivot on the pump, and check that the cable is not getting stuck...

  • Yamaha XT 550 / Yamaha Nitro 100cc

Offline Stanthescooterman

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Re: Yamaha Nitro / BWS Petrol : 2T ratio
« Reply #7 on: September 11, 2017, 01:52:25 PM »
OK, pump minimum setting should be so that the pump starts opening just a fraction before your carb slide starts rising, when you twist your grip.

Max. setting should be as per my info in my last post.

You can't do any better than ticking the 3 points I raised previously ... that's pretty much optimised!
Previous bikes & scooters:
BMW C600 Sport
Kymco Grand Dink 250 (300),
BMW F650GS Dakar,
Gilera Runner 180,
Kymco Agility 125,
Kymco TB100,
Kymco Heroism KH125,
Honda CBX550FII,
Suzuki RG50 Gamma


Offline Vincent

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Re: Yamaha Nitro / BWS Petrol : 2T ratio
« Reply #8 on: September 11, 2017, 02:18:46 PM »
OK, pump minimum setting should be so that the pump starts opening just a fraction before your carb slide starts rising, when you twist your grip.

Max. setting should be as per my info in my last post.

You can't do any better than ticking the 3 points I raised previously ... that's pretty much optimised!

Well, I have a commute of 34km in total every day, 17km in the morning, and 17km in the evening, so that should be all boxes ticked!
  • Yamaha XT 550 / Yamaha Nitro 100cc