premix fail!

[stevo as b4]

I've just realised that I make a slight fuck up yesterday when I took my KMX out for a little run and filled it up..

At the petrol station I added 400ml of two stroke oil and then chucked in 4litres of unleaded. Unless I'm mistaken that means I've mixed at 10:1 instead of the 40:1 that I was after.

My complete lack of simple maths has worked out that I should have used 100ml for 4litres or 125ml for 5litres of fuel which would be better. Please someone confirm this who can add up, before I go near my bike again!

I think I'm right in saying that I would need 16litres of unleaded to make 400ml of oil into 40:1, and I don't know what the fuck I was doing yesterday apart from day dreaming in the sun?

I think I need to find some 125ml containers or test tubes etc, that I can pre-fill and carry in my jacket or under the seat, to protect my bike from noob maths?

[G]

Yep, 16 litres extra - but you've presumably used a bit since.

.5l * 40 = 20l
20l-4l=16l

Usual answer is to get some baby bottles for the 2 stroke and use a marker to mark them up in litres of petrol - then you don't need to do any calculations after 4 hours on the trails - just read what the pump says and squirt in an appropriate matching amount.

[_Iain_]

I use a big sticker on the side of my little 250ml two stroke bottles that says in huge letters 40:1 = 25ml/ltr on the side of it incase I'm feeling derpy and under oil it!
____________________
Please be aware that the above post may be full of complete nonsense.
Riding: '07 KTM Duke II, Baotian BT49QT-20 Driving: '88 Volvo 340

[G]

Remember that while overoiling will mean it's plenty-lubricated, it'll also make the main mixture run lean - as there's now less explosive fuel available, so the petrol/air ratio is leaned out.

[Blau Zedong]

Why is OP premixing?
____________________
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

[stevo as b4]

Thanks G etc for the useful tip on noob proofing my pre mixing containers!

Yeah, I was out putting about 10running in miles on the fresh motor, and thinking about how nice a day it was really while throwing oil and fuel in!

Blue, I did get an oil pump with the bike when I brought it, but it was a crusty looking thing in the bottom of a box of grubby spares. The previous owner obviously thought better of re-using a 28year old pump that he wasn't sure would even work I guess.

I know it detracts from originality etc, but for the amount of miles a year I'm going to put on it, running it on pre-mix isn't a big deal for me, and I know a few 2stroke restorers that won't even entertain the idea of using autolube on old or expensive 2strokes. As I understand it, the pumps are non DIY re-buildable anyway?

G, your right about the fuel ratio's being all to cock, I did about 4miles back home after the re-fuel, and there was probably a litre or so of 40:1 already in the tank. It did seem a bit smokey though!

I suppose it could have been a bit lean, but it's running +2 sizes on the MJ, and I'll either try and find big enough containers to correct my fuel ratio, or just drain it all out, and use it in the 4stroke lawnmower instead.

I will get round to making the oil tank that's still fitted on the bike a kind of dispenser even if I just fit a little tap on the oil line and carry a graduated container too.

[Blau Zedong]

[stevo as b4]

I see your point.

I guess I just thought the seller's logic was sound, but I do agree that a reliable working oil pump would be the best overall solution and keep the bike more original too!
I'll run it in first (assuming I don't fuck up again) and then add it as a future to do project.

I think if I were going to use the bike for serious mileage or put it up for sale id want the autolube system working really. Did you have any issue's with your X5's oil pump, and have you tested it first before fitting it to the bike?

I've been told that using a cordless drill on the drive gear at a known rpm, is one way of testing the pumps output off the bike and deeming if it's fit to use or ready for the bin?

The thing with my KMX is that it's nothing like as original and correct in detail as your X5 mate. It's got the overall look of an 86 model, with the right style decals etc, and it's soon going to get a blue seat, but it's got stuff like powdercoated black rims, aftermarket pipe, rear light and numberplate holder and stainless brake lines etc.

I'm not really interested in getting all the details correct or original, just the overall look something a bit like they were new.